untabify Makefile, cosmetic change in pos_set_checkers_pinners_blockers()

perft: normal "get_next_legal()" before movegen
perft2: is_in_check() after movegen

.dir-locals.el

@@ -1,3 +1,3 @@
 ((nil . ((compile-command . (concat "make -C "
                                        (vc-root-dir)
-                                       " -k -j2")))))
+                                       " -k -j2 testing")))))

.gitignore

@@ -4,6 +4,10 @@ vgcore.*
 *.i
 *.old
 *.save
+perf.data
+/GPATH
+/GRTAGS
+/GTAGS
 /.ccls-root
 /.ccls-cache/
 /obj/
@@ -14,4 +18,5 @@ vgcore.*
 /tmp/
 /notused/
 valgrind.out
+gmon.out
 compile_commands.json

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "brlib"]
+	path = brlib
+	url = ../brlib.git

COPYING

@@ -0,0 +1,674 @@
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+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

MEMO.org

@@ -0,0 +1,2 @@
+** Some current ideas
+- helpers for square, pieces, etc: validity, conversions

Makefile

@@ -1,6 +1,6 @@
-# Makefile - GNU make only.
+# Makefile - brchess Makefile, **GNU make only**
 #
-# Copyright (C) 2021-2023 Bruno Raoult ("br")
+# Copyright (C) 2021-2024 Bruno Raoult ("br")
 # Licensed under the GNU General Public License v3.0 or later.
 # Some rights reserved. See COPYING.
 #
@@ -12,22 +12,24 @@
 
 SHELL     := /bin/bash
 CC        := gcc
+#CC        := clang
 LD        := ld
 BEAR      := bear
 TOUCH     := touch
 RM        := rm
 RMDIR     := rmdir
+MAKE      := make
 
 SRCDIR    := ./src
-INCDIR    := ./include
+INCDIR    := ./src                                          # used by ./test sources
 OBJDIR    := ./obj
-
-LIBSRCDIR := ./libsrc
-LIBOBJDIR := ./libobj
-
 BINDIR    := ./bin
-LIBDIR    := ./lib
 DEPDIR    := ./dep
+TSTDIR    := ./test
+
+BRLIB     := ./brlib
+BRINCDIR  := $(BRLIB)/include
+BRLIBDIR  := $(BRLIB)/lib
 
 CCLSROOT  := .ccls-root
 CCLSFILE  := compile_commands.json
@@ -36,74 +38,115 @@ SRC       := $(wildcard $(SRCDIR)/*.c)                      # project sources
 SRC_FN    := $(notdir $(SRC))                               # source basename
 OBJ       := $(addprefix $(OBJDIR)/,$(SRC_FN:.c=.o))
 
-LIBSRC    := $(wildcard $(LIBSRCDIR)/*.c)                   # lib sources
-LIBSRC_FN := $(notdir $(LIBSRC))                            # lib sources basename
-LIBOBJ    := $(addprefix $(LIBOBJDIR)/,$(LIBSRC_FN:.c=.o))  # and lib obj ones
+TSTSRC    := $(wildcard $(TSTDIR)/*.c)
 
 LIB       := br_$(shell uname -m)                           # library name
-SLIB      := $(addsuffix .a, $(LIBDIR)/lib$(LIB))           # static lib
-DLIB      := $(addsuffix .so, $(LIBDIR)/lib$(LIB))          # dynamic lib
+LIBS      := $(strip -l$(LIB) -lreadline)
 
-DEP_FN    := $(SRC_FN) $(LIBSRC_FN)
+DEP_FN    := $(SRC_FN)
 DEP       := $(addprefix $(DEPDIR)/,$(DEP_FN:.c=.d))
 
 TARGET_FN := brchess
 TARGET    := $(addprefix $(BINDIR)/,$(TARGET_FN))
 
-LDFLAGS   := -L$(LIBDIR)
-LIBS      := -l$(LIB) -lreadline -lncurses
+ASMFILES  := $(SRC:.c=.s) $(TSTSRC:.c=.s)
+CPPFILES  := $(SRC:.c=.i) $(TSTSRC:.c=.i)
 
 ##################################### pre-processor flags
-CPPFLAGS  := -I$(INCDIR)
-CPPFLAGS  += -DDEBUG                         # global
-CPPFLAGS  += -DDEBUG_DEBUG                   # enable log() functions
-#CPPFLAGS  += -DDEBUG_DEBUG_C                # enable verbose log() settings
-CPPFLAGS  += -DDEBUG_POOL                    # memory pools management
-CPPFLAGS  += -DDEBUG_FEN                     # FEN decoding
-CPPFLAGS  += -DDEBUG_MOVE                    # move generation
-CPPFLAGS  += -DDEBUG_EVAL                    # eval functions
-CPPFLAGS  += -DDEBUG_PIECE                   # piece list management
-CPPFLAGS  += -DDEBUG_SEARCH                  # move search
+CPPFLAGS  := -I$(BRINCDIR) -I$(INCDIR)
+
+CPPFLAGS  += -DNDEBUG                                       # assert
+CPPFLAGS  += -DBUG_ON                                       # brlib bug.h
+CPPFLAGS  += -DWARN_ON                                      # brlib bug.h
+
+#CPPFLAGS  += -DDEBUG                                        # global - unused
+#CPPFLAGS  += -DDEBUG_DEBUG                                  # enable log() functions
+#CPPFLAGS  += -DDEBUG_DEBUG_C                                # enable log() settings
+#CPPFLAGS  += -DDEBUG_POOL                                   # memory pools management
+#CPPFLAGS  += -DDEBUG_POS                                    # position.c
+#CPPFLAGS  += -DDEBUG_MOVE                                   # move generation
+
+# fen.c
+#CPPFLAGS  += -DDEBUG_FEN                                    # FEN decoding
+
+# attack.c
+#CPPFLAGS  += -DDEBUG_ATTACK_ATTACKERS1                      # sq_attackers details
+CPPFLAGS  += -DDEBUG_ATTACK_ATTACKERS                       # sq_attackers
+CPPFLAGS  += -DDEBUG_ATTACK_PINNERS                         # sq_pinners details
+
+#CPPFLAGS  += -DDEBUG_EVAL                                   # eval functions
+#CPPFLAGS  += -DDEBUG_PIECE                                  # piece list management
+#CPPFLAGS  += -DDEBUG_SEARCH                                 # move search
+
+CPPFLAGS  += -DDIAGRAM_SYM                                  # diagram with symbols
 
 # remove extraneous spaces (due to spaces before comments)
 CPPFLAGS  := $(strip $(CPPFLAGS))
 
 ##################################### compiler flags
 CFLAGS    := -std=gnu11
-#CFLAGS += -O2
-CFLAGS    += -g
+
+### dev OR release
+
+# dev
+# CFLAGS    += -O1
+CFLAGS    += -g                                             # symbols (gdb, perf, etc.)
+CFLAGS    += -ginline-points                                # inlined funcs debug info
+# for gprof
+#CFLAGS += -pg
+# Next one may be useful for valgrind (when invalid instructions)
+#CFLAGS += -mno-tbm
+
+# release
+CFLAGS    += -Ofast
+
+CFLAGS    += -march=native
+CFLAGS    += -flto
 CFLAGS    += -Wall
 CFLAGS    += -Wextra
-CFLAGS    += -march=native
 CFLAGS    += -Wmissing-declarations
-# for gprof
-# CFLAGS += -pg
-# Next one may be useful for valgrind (when invalid instructions)
-# CFLAGS += -mno-tbm
 
 CFLAGS    := $(strip $(CFLAGS))
 
-##################################### archiver/linker/dependency flags
+# development CFLAGS - unused - TODO
+#DEV_CFLAGS := -O1
+#DEV_CFLAGS += -g
+
+# release CFLAGS - unused - TODO
+#REL_CFLAGS := -Ofast
+
+##################################### linker flags
+LDFLAGS   := --static
+LDFLAGS   += -L$(BRLIBDIR)
+LDFLAGS   += -flto
+
+LDFLAGS   := $(strip $(LDFLAGS))
+
+##################################### archiver/dependency flags
 ARFLAGS   := rcs
-LDFLAGS   := -L$(LIBDIR)
-DEPFLAGS  = -MMD -MP -MF $(DEPDIR)/$*.d
+DEPFLAGS   = -MMD -MP -MF $(DEPDIR)/$*.d
+
+##################################### archiver/dependency flags
+ALL_CFLAGS  = $(DEPFLAGS) $(CPPFLAGS) $(CFLAGS)
+ALL_LDFLAGS = $(LDFLAGS) $(LIBS)
 
 ##################################### General targets
-.PHONY: all clean cleanall
+.PHONY: all compile clean cleanall
 
 all: $(TARGET)
 
-compile: libobjs objs
+compile: brlib objs
 
-clean: cleandep cleanobj cleanlib cleanlibobj cleanbin
+libs: brlib
 
-cleanall: clean cleandepdir cleanobjdir cleanlibdir cleanlibobjdir cleanbindir
+clean: cleandep cleanasmcpp cleanobj cleanbin
+
+cleanall: clean cleandepdir cleanobjdir cleanallbrlib cleanbindir
 
 ##################################### cleaning functions
-# rmfiles - deletes a list of files in a directory if they exist.
+# rmfiles - delete a list of files if they exist.
 # $(1): the directory
-# $(2): the list of files to delete
-# $(3): The string to include in action output - "cleaning X files."
+# $(2): The string to include in action output - "cleaning X files."
 # see: https://stackoverflow.com/questions/6783243/functions-in-makefiles
 #
 # Don't use wildcard like "$(DIR)/*.o", so we can control mismatches between
@@ -119,7 +162,7 @@ define rmfiles
 	fi
 endef
 
-# rmdir - deletes a directory if it exists.
+# rmdir - delete a directory if it exists.
 # $(1): the directory
 # $(2): The string to include in action output - "removing X dir."
 #
@@ -138,7 +181,7 @@ endef
 ##################################### dirs creation
 .PHONY: alldirs
 
-ALLDIRS   := $(DEPDIR) $(OBJDIR) $(LIBDIR) $(LIBOBJDIR) $(BINDIR)
+ALLDIRS   := $(DEPDIR) $(OBJDIR) $(BINDIR)
 
 alldirs: $(ALLDIRS)
 
@@ -179,44 +222,20 @@ cleanobjdir: cleanobj
 # The part right of '|' are "order-only prerequisites": They are build as
 # "normal" ones, but do not imply to rebuild target.
 $(OBJDIR)/%.o: $(SRCDIR)/%.c | $(OBJDIR) $(DEPDIR)
-	@echo compiling brchess $< "->" $@.
-	@$(CC) -c $(DEPFLAGS) $(CPPFLAGS) $(CFLAGS) $< -o $@
-
-##################################### brlib objects
-.PHONY: libobjs cleanlibobj cleanlibobjdir
-
-libobjs: $(LIBOBJ)
-
-cleanlibobj:
-	$(call rmfiles,$(LIBOBJ),brlib object)
-
-cleanlibobjdir:
-	$(call rmdir,$(LIBOBJDIR),brlib objects)
-
-$(LIBOBJDIR)/%.o: $(LIBSRCDIR)/%.c | $(LIBOBJDIR) $(DEPDIR)
-	@echo compiling library $< "->" $@.
-	$(CC) -c $(DEPFLAGS) $(CPPFLAGS) $(CFLAGS) $< -o $@
+	@echo compiling brchess module: $< "->" $@.
+	@$(CC) -c $(ALL_CFLAGS) $< -o $@
 
 ##################################### brlib libraries
-.PHONY: libs cleanlib cleanlibdir
+.PHONY: cleanbrlib cleanallbrlib brlib
 
-cleanlib:
-	$(call rmfiles,$(DLIB) $(SLIB),library)
+cleanbrlib:
+	$(MAKE) -C $(BRLIB) clean
 
-cleanlibdir:
-	$(call rmdir,$(LIBDIR),libraries)
+cleanallbrlib:
+	$(MAKE) -C $(BRLIB) cleanall
 
-libs: $(DLIB) $(SLIB)
-
-$(DLIB): CFLAGS += -fPIC
-$(DLIB): LDFLAGS += -shared
-$(DLIB): $(LIBOBJ) | $(LIBDIR)
-	@echo building $@ shared library.
-	@$(CC) $(CFLAGS) $(LDFLAGS) $^ -o $@
-
-$(SLIB): $(LIBOBJ) | $(LIBDIR)
-	@echo building $@ static library.
-	$(AR) $(ARFLAGS) $@ $^
+brlib:
+	$(MAKE) -C $(BRLIB) libs
 
 ##################################### brchess binaries
 .PHONY: targets cleanbin cleanbindir
@@ -229,18 +248,22 @@ cleanbin:
 cleanbindir:
 	$(call rmdir,$(BINDIR),binaries)
 
-# We don't use static lib, but we could build it here
-$(TARGET): $(DLIB) $(OBJ) | $(BINDIR) $(SLIB)
-	@echo generating $@ executable.
-	@$(CC) $(LDFLAGS) $(OBJ) $(LIBS) -o $@
+$(TARGET): libs $(OBJ) | $(BINDIR)
+	@echo generating $@.
+	$(CC) $(LDFLAGS) $(OBJ) $(LIBS) -o $@
 
 ##################################### pre-processed (.i) and assembler (.s) output
+.PHONY: cleanasmcpp
+
+cleanasmcpp:
+	@$(call rmfiles,$(ASMFILES) $(CPPFILES),asm and pre-processed)
+
 %.i: %.c
-	@echo generating $@
+	@echo "generating $@ (cpp processed)."
 	@$(CC) -E $(CPPFLAGS) $(CFLAGS) $< -o $@
 
 %.s: %.c
-	@echo generating $@
+	@echo "generating $@ (asm)."
 	@$(CC) -S -fverbose-asm $(CPPFLAGS) $(CFLAGS) $< -o $@
 
 ##################################### LSP (ccls)
@@ -253,17 +276,13 @@ $(CCLSROOT):
 	@$(TOUCH) $@
 
 # generate compile_commands.json.
-# Need to add includes and Makefile dependencies.
+# TODO: add Makefile dependencies.
 # also, if cclsfile is newer than sources, no need to clean objects file
 # (and to run bear).
 # maybe run cleanobj cleanlibobj in commands ?
-$(CCLSFILE): cleanobj cleanlibobj $(SRC) $(LIBSRC) | $(CCLSROOT)
+$(CCLSFILE): cleanobj cleanbrlib libs | $(CCLSROOT)
 	@echo "Generating ccls compile commands file ($@)."
-	@$(BEAR) -- make compile
-
-#.PHONY: bear
-#bear: cleanobj cleanlibobj Makefile | $(CCLSROOT)
-#    @$(BEAR) -- make compile
+	@$(BEAR) -- $(MAKE) testing
 
 ##################################### valgrind (mem check)
 .PHONY: memcheck
@@ -280,6 +299,65 @@ VALGRINDFLAGS += --suppressions=etc/libreadline.supp
 memcheck: targets
 	@$(VALGRIND) $(VALGRINDFLAGS) $(BINDIR)/brchess
 
+##################################### test binaries
+.PHONY: testing test
+
+TEST          := piece-test fen-test bitboard-test movegen-test attack-test
+TEST          += movedo-test perft-test
+
+PIECE_OBJS    := piece.o
+FEN_OBJS      := $(PIECE_OBJS) fen.o position.o bitboard.o board.o \
+	hyperbola-quintessence.o attack.o
+BB_OBJS       := $(FEN_OBJS)
+MOVEGEN_OBJS  := $(BB_OBJS) move.o move-gen.o
+ATTACK_OBJS   := $(MOVEGEN_OBJS)
+MOVEDO_OBJS   := $(ATTACK_OBJS) move-do.o
+PERFT_OBJS    := $(MOVEDO_OBJS) search.o misc.o
+
+TEST          := $(addprefix $(BINDIR)/,$(TEST))
+
+PIECE_OBJS    := $(addprefix $(OBJDIR)/,$(PIECE_OBJS))
+FEN_OBJS      := $(addprefix $(OBJDIR)/,$(FEN_OBJS))
+BB_OBJS       := $(addprefix $(OBJDIR)/,$(BB_OBJS))
+MOVEGEN_OBJS  := $(addprefix $(OBJDIR)/,$(MOVEGEN_OBJS))
+ATTACK_OBJS   := $(addprefix $(OBJDIR)/,$(ATTACK_OBJS))
+MOVEDO_OBJS   := $(addprefix $(OBJDIR)/,$(MOVEDO_OBJS))
+PERFT_OBJS    := $(addprefix $(OBJDIR)/,$(PERFT_OBJS))
+
+test:
+	echo TEST=$(TEST)
+	echo FEN_OBJS=$(FEN_OBJS)
+
+testing: $(TEST)
+
+bin/piece-test: test/piece-test.c $(FEN_OBJS)
+	@echo compiling $@ test executable.
+	@$(CC) $(ALL_CFLAGS) $< $(FEN_OBJS) $(ALL_LDFLAGS) -o $@
+
+bin/fen-test: test/fen-test.c test/common-test.h $(FEN_OBJS)
+	@echo compiling $@ test executable.
+	@$(CC) $(ALL_CFLAGS) $< $(FEN_OBJS) $(ALL_LDFLAGS) -o $@
+
+bin/bitboard-test: test/bitboard-test.c test/common-test.h $(BB_OBJS)
+	@echo compiling $@ test executable.
+	@$(CC) $(ALL_CFLAGS) $< $(BB_OBJS) $(ALL_LDFLAGS) -o $@
+
+bin/movegen-test: test/movegen-test.c test/common-test.h $(MOVEGEN_OBJS)
+	@echo compiling $@ test executable.
+	@$(CC) $(ALL_CFLAGS) $< $(MOVEGEN_OBJS) $(ALL_LDFLAGS) -o $@
+
+bin/attack-test: test/attack-test.c test/common-test.h $(ATTACK_OBJS)
+	@echo compiling $@ test executable.
+	@$(CC) $(ALL_CFLAGS) $< $(ATTACK_OBJS) $(ALL_LDFLAGS) -o $@
+
+bin/movedo-test: test/movedo-test.c test/common-test.h $(MOVEDO_OBJS)
+	@echo compiling $@ test executable.
+	@$(CC) $(ALL_CFLAGS) $< $(MOVEDO_OBJS) $(ALL_LDFLAGS) -o $@
+
+bin/perft-test: test/perft-test.c test/common-test.h $(PERFT_OBJS)
+	@echo compiling $@ test executable.
+	@$(CC) $(ALL_CFLAGS) $< $(PERFT_OBJS) $(ALL_LDFLAGS) -o $@
+
 ##################################### Makefile debug
 .PHONY: showflags wft
 
@@ -291,10 +369,14 @@ showflags:
 	@echo DEPFLAGS: $(DEPFLAGS)
 
 wtf:
-	@printf "LIBOBJDIR=%s\n\n" "$(LIBOBJDIR)"
-	@printf "LIBOBJ=%s\n\n" "$(LIBOBJ)"
-	@printf "OBJDIR=%s\n\n" "$(OBJDIR)"
-	@printf "OBJ=%s\n\n" "$(OBJ)"
+	@printf "BRLIBDIR=%s\n" "$(BRLIBDIR)"
+	@printf "LDFLAGS=%s\n\n" "$(LDFLAGS)"
+	@#printf "LIBOBJ=%s\n\n" "$(LIBOBJ)"
+	@#printf "OBJDIR=%s\n\n" "$(OBJDIR)"
+	@#printf "OBJ=%s\n\n" "$(OBJ)"
 	@#echo LIBOBJ=$(LIBOBJ)
 	@#echo DEP=$(DEP)
 	@#echo LIBSRC=$(LIBSRC)
+
+zob:
+	$(CC) $(LDFLAGS) $(CPPFLAGS) $(CFLAGS) $< $(LIBS) src/util.c -o util

README.org

@@ -1 +1,40 @@
-A basic chess program. The goal is not to make it good, but at least to be able to play a full game - Far to be the case !
+#+OPTIONS: toc:nil
+#+OPTIONS: num:2
+**This is not a working chess program !!**
+
+/I am only experimenting some chess programming concepts./
+
+** License
+~SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>~~
+
+This work is Copyright (C) 2021-2024 Bruno Raoult ("br"), and licensed under
+the GNU General Public License v3.0 or later.
+
+Some rights reserved. See COPYING.
+
+** Installation (don't do it until version 0.9)
+*** dependencire
+- GCC 10 or newer
+- libreadline
+*** clone repository
+*user...**
+#+BEGIN_EXAMPLE
+$ git clone https://github.com/braoult/brchess.git
+or
+$ git clone https://git.raoult.com/bruno/brchess.git
+#+END_EXAMPLE
+
+*OR ...developer*
+#+BEGIN_EXAMPLE
+$ git clone git@git.raoult.com:bruno/brchess.git
+$ cd brchess
+$ git remote add github git@github.com:braoult/brchess.git
+$ git fetch --all
+#+END_EXAMPLE
+
+*** add "brlib" submodule
+#+BEGIN_EXAMPLE
+$ cd brchess
+$ git submodule init
+$ git submodule update
+#+END_EXAMPLE

env.sh

@@ -1 +0,0 @@
-export LD_LIBRARY_PATH=./lib

include/bits.h

@@ -1,499 +0,0 @@
-/* bits.h - bits functions.
- *
- * Copyright (C) 2021-2022 Bruno Raoult ("br")
- * Licensed under the GNU General Public License v3.0 or later.
- * Some rights reserved. See COPYING.
- *
- * You should have received a copy of the GNU General Public License along with this
- * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
- *
- * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
- *
- */
-#ifndef _BITS_H
-#define _BITS_H
-
-#include <stdint.h>
-#include <stdbool.h>
-#include <bits/wordsize.h>                        /* defines __WORDSIZE: 32 or 64 */
-
-void bits_implementation(void);
-
-#ifndef __has_builtin
-#define __has_builtin(x) 0
-#endif
-
-/* no plan to support 32bits for now...
- * #if __WORDSIZE != 64
- * #error "Only 64 bits word size supported."
- * #endif
- */
-
-/* fixed-size types
- */
-typedef int64_t  s64;
-typedef int32_t  s32;
-typedef int16_t  s16;
-typedef int8_t   s8;
-
-typedef uint64_t u64;
-typedef uint32_t u32;
-typedef uint16_t u16;
-typedef uint8_t  u8;
-
-/* convenience types
- */
-typedef long long int llong;
-typedef unsigned long long int ullong;
-typedef unsigned long int ulong;
-typedef unsigned int uint;
-typedef unsigned short ushort;
-typedef unsigned char uchar;
-/* char is a special case, as it can be signed or unsigned
- */
-typedef signed char schar;
-
-/* define common types sizes
- */
-#define BITS_PER_CHAR 8
-
-#ifndef BITS_PER_SHORT
-#define BITS_PER_SHORT (BITS_PER_CHAR * sizeof (short))
-#endif
-#ifndef BITS_PER_INT
-#define BITS_PER_INT   (BITS_PER_CHAR * sizeof (int))
-#endif
-#ifndef BITS_PER_LONG
-#define BITS_PER_LONG  (BITS_PER_CHAR * sizeof (long))
-#endif
-#ifndef BITS_PER_LLONG
-#define BITS_PER_LLONG (BITS_PER_CHAR * sizeof (long long))
-#endif
-
-/* count set bits:  10101000 -> 3
- *                  ^ ^ ^
- */
-static __always_inline int popcount64(u64 n)
-{
-#   if __has_builtin(__builtin_popcountl)
-    return __builtin_popcountl(n);
-
-#   else
-    int count = 0;
-    while (n) {
-        count++;
-        n &= (n - 1);
-    }
-    return count;
-#   endif
-}
-
-static __always_inline int popcount32(u32 n)
-{
-#   if __has_builtin(__builtin_popcount)
-    return __builtin_popcount(n);
-
-#   else
-    int count = 0;
-    while (n) {
-        count++;
-        n &= (n - 1);
-    }
-    return count;
-#   endif
-}
-
-/* count trailing zeroes : 00101000 -> 3
- *                              ^^^
- */
-static __always_inline int ctz64(u64 n)
-{
-#   if __has_builtin(__builtin_ctzl)
-    return __builtin_ctzl(n);
-
-#   elif __has_builtin(__builtin_clzl)
-    return __WORDSIZE - (__builtin_clzl(n & -n) + 1);
-
-#   else
-    return popcount64((n & -n) - 1);
-#   endif
-}
-
-static __always_inline int ctz32(u32 n)
-{
-#   if __has_builtin(__builtin_ctz)
-    return __builtin_ctzl(n);
-
-#   elif __has_builtin(__builtin_clz)
-    return __WORDSIZE - (__builtin_clz(n & -n) + 1);
-
-#   else
-    return popcount32((n & -n) - 1);
-#   endif
-}
-
-/* clz - count leading zeroes : 00101000 -> 2
- *                              ^^
- */
-static __always_inline int clz64(u64 n)
-{
-#   if __has_builtin(__builtin_clzl)
-    return __builtin_clzl(n);
-
-#   else
-    u64 r, q;
-
-    r = (n > 0xFFFFFFFF) << 5; n >>= r;
-    q = (n > 0xFFFF)     << 4; n >>= q; r |= q;
-    q = (n > 0xFF  )     << 3; n >>= q; r |= q;
-    q = (n > 0xF   )     << 2; n >>= q; r |= q;
-    q = (n > 0x3   )     << 1; n >>= q; r |= q;
-    r |= (n >> 1);
-    return 64 - r - 1;
-#   endif
-}
-
-static __always_inline int clz32(u32 n)
-{
-#   if __has_builtin(__builtin_clz)
-    return __builtin_clz(n);
-
-#   else
-    u32 r, q;
-
-    r = (n > 0xFFFF)     << 4; n >>= r;
-    q = (n > 0xFF  )     << 3; n >>= q; r |= q;
-    q = (n > 0xF   )     << 2; n >>= q; r |= q;
-    q = (n > 0x3   )     << 1; n >>= q; r |= q;
-    r |= (n >> 1);
-    return 32 - r - 1;
-#   endif
-}
-
-/* fls - find last set : 00101000 -> 6
- *                         ^
- */
-static __always_inline int fls64(u64 n)
-{
-    if (!n)
-        return 0;
-    return 64 - clz64(n);
-}
-
-static __always_inline int fls32(u32 n)
-{
-    if (!n)
-        return 0;
-    return 32 - clz32(n);
-}
-
-/* find first set :  00101000 -> 4
- *                       ^
- */
-static __always_inline uint ffs64(u64 n)
-{
-#   if __has_builtin(__builtin_ffsl)
-    return __builtin_ffsl(n);
-
-#   elif __has_builtin(__builtin_ctzl)
-    if (n == 0)
-        return (0);
-    return __builtin_ctzl(n) + 1;
-
-#   else
-    return popcount64(n ^ ~-n);
-#   endif
-}
-
-static __always_inline uint ffs32(u32 n)
-{
-#   if __has_builtin(__builtin_ffs)
-    return __builtin_ffs(n);
-
-#   elif __has_builtin(__builtin_ctz)
-    if (n == 0)
-        return (0);
-    return __builtin_ctz(n) + 1;
-
-#   else
-    return popcount32(n ^ ~-n);
-#   endif
-}
-
-/* rolXX/rorXX are taken from kernel's <linux/bitops.h> are are:
- * SPDX-License-Identifier: GPL-2.0
- */
-
-/**
- * rol64 - rotate a 64-bit value left
- * @word: value to rotate
- * @shift: bits to roll
- */
-static inline u64 rol64(u64 word, unsigned int shift)
-{
-        return (word << (shift & 63)) | (word >> ((-shift) & 63));
-}
-
-/**
- * ror64 - rotate a 64-bit value right
- * @word: value to rotate
- * @shift: bits to roll
- */
-static inline u64 ror64(u64 word, unsigned int shift)
-{
-        return (word >> (shift & 63)) | (word << ((-shift) & 63));
-}
-
-/**
- * rol32 - rotate a 32-bit value left
- * @word: value to rotate
- * @shift: bits to roll
- */
-static inline u32 rol32(u32 word, unsigned int shift)
-{
-        return (word << (shift & 31)) | (word >> ((-shift) & 31));
-}
-
-/**
- * ror32 - rotate a 32-bit value right
- * @word: value to rotate
- * @shift: bits to roll
- */
-static inline u32 ror32(u32 word, unsigned int shift)
-{
-        return (word >> (shift & 31)) | (word << ((-shift) & 31));
-}
-
-/**
- * rol16 - rotate a 16-bit value left
- * @word: value to rotate
- * @shift: bits to roll
- */
-static inline u16 rol16(u16 word, unsigned int shift)
-{
-        return (word << (shift & 15)) | (word >> ((-shift) & 15));
-}
-
-/**
- * ror16 - rotate a 16-bit value right
- * @word: value to rotate
- * @shift: bits to roll
- */
-static inline u16 ror16(u16 word, unsigned int shift)
-{
-        return (word >> (shift & 15)) | (word << ((-shift) & 15));
-}
-
-/**
- * rol8 - rotate an 8-bit value left
- * @word: value to rotate
- * @shift: bits to roll
- */
-static inline u8 rol8(u8 word, unsigned int shift)
-{
-        return (word << (shift & 7)) | (word >> ((-shift) & 7));
-}
-
-/**
- * ror8 - rotate an 8-bit value right
- * @word: value to rotate
- * @shift: bits to roll
- */
-static inline u8 ror8(u8 word, unsigned int shift)
-{
-        return (word >> (shift & 7)) | (word << ((-shift) & 7));
-}
-
-/**
- * __ilog2 - non-constant log of base 2 calculators
- * - the arch may override these in asm/bitops.h if they can be implemented
- *   more efficiently than using fls() and fls64()
- * - the arch is not required to handle n==0 if implementing the fallback
- */
-static __always_inline __attribute__((const))
-int __ilog2_u64(u64 n)
-{
-        return fls64(n) - 1;
-}
-
-static __always_inline __attribute__((const))
-int __ilog2_u32(u32 n)
-{
-        return fls32(n) - 1;
-}
-
-/**
- * is_power_of_2() - check if a value is a power of two
- * @n: the value to check
- *
- * Determine whether some value is a power of two, where zero is
- * *not* considered a power of two.
- * Return: true if @n is a power of 2, otherwise false.
- */
-static inline __attribute__((const))
-bool is_power_of_2(unsigned long n)
-{
-        return (n != 0 && ((n & (n - 1)) == 0));
-}
-
-/**
- * __roundup_pow_of_two() - round up to nearest power of two
- * @n: value to round up
- */
-static inline __attribute__((const))
-u64 __roundup_pow_of_two(u64 n)
-{
-        return 1UL << fls64(n - 1);
-}
-
-/**
- * __rounddown_pow_of_two() - round down to nearest power of two
- * @n: value to round down
- */
-static inline __attribute__((const)) u64 __rounddown_pow_of_two(u64 n)
-{
-        return 1UL << (fls64(n) - 1);
-}
-
-/**
- * ilog2 - log base 2 of 32-bit or a 64-bit unsigned value
- * @n: parameter
- *
- * constant-capable log of base 2 calculation
- * - this can be used to initialise global variables from constant data, hence
- * the massive ternary operator construction
- *
- * selects the appropriately-sized optimised version depending on sizeof(n)
- */
-#define ilog2(n)                        \
-(                                       \
-        __builtin_constant_p(n) ?       \
-        ((n) < 2 ? 0 :                  \
-         63 - __builtin_clzll(n)) :     \
-        (sizeof(n) <= 4) ?              \
-        __ilog2_u32(n) :                \
-        __ilog2_u64(n)                  \
- )
-
-/**
- * roundup_pow_of_two - round the given value up to nearest power of two
- * @n: parameter
- *
- * round the given value up to the nearest power of two
- * - the result is undefined when n == 0
- * - this can be used to initialise global variables from constant data
- */
-#define roundup_pow_of_two(n)                   \
-(                                               \
-        __builtin_constant_p(n) ? (             \
-                ((n) == 1) ? 1 :                \
-                (1UL << (ilog2((n) - 1) + 1))   \
-                                   ) :          \
-        __roundup_pow_of_two(n)                 \
- )
-
-/**
- * rounddown_pow_of_two - round the given value down to nearest power of two
- * @n: parameter
- *
- * round the given value down to the nearest power of two
- * - the result is undefined when n == 0
- * - this can be used to initialise global variables from constant data
- */
-#define rounddown_pow_of_two(n)                 \
-(                                               \
-        __builtin_constant_p(n) ? (             \
-                (1UL << ilog2(n))) :            \
-        __rounddown_pow_of_two(n)               \
- )
-
-static inline __attribute_const__ int __order_base_2(unsigned long n)
-{
-        return n > 1 ? ilog2(n - 1) + 1 : 0;
-}
-
-/**
- * order_base_2 - calculate the (rounded up) base 2 order of the argument
- * @n: parameter
- *
- * The first few values calculated by this routine:
- *  ob2(0) = 0
- *  ob2(1) = 0
- *  ob2(2) = 1
- *  ob2(3) = 2
- *  ob2(4) = 2
- *  ob2(5) = 3
- *  ... and so on.
- */
-#define order_base_2(n)                         \
-(                                               \
-        __builtin_constant_p(n) ? (             \
-            ((n) == 0 || (n) == 1) ?            \
-            0 :                                 \
-            ilog2((n) - 1) + 1) :               \
-        __order_base_2(n)                       \
-)
-
-static inline __attribute__((const)) int __bits_per(unsigned long n)
-{
-        if (n < 2)
-            return 1;
-        if (is_power_of_2(n))
-            return order_base_2(n) + 1;
-        return order_base_2(n);
-}
-
-/**
- * bits_per - calculate the number of bits required for the argument
- * @n: parameter
- *
- * This is constant-capable and can be used for compile time
- * initializations, e.g bitfields.
- *
- * The first few values calculated by this routine:
- * bf(0) = 1
- * bf(1) = 1
- * bf(2) = 2
- * bf(3) = 2
- * bf(4) = 3
- * ... and so on.
- */
-#define bits_per(n)                             \
-(                                               \
-        __builtin_constant_p(n) ? (             \
-            ((n) == 0 || (n) == 1) ?            \
-            1 :                                 \
-            ilog2(n) + 1 :                      \
-            __bits_per(n)                       \
-)
-
-/** bit_for_each - iterate over an u64/u32 bits
- * @pos:        an int used as current bit
- * @tmp:        a temp u64/u32 used as temporary storage
- * @ul:         the u64/u32 to loop over
- *
- * Usage:
- * u64 u=139, _t;     //  u=b10001011
- * int cur;
- * bit_for_each64(cur, _t, u) {
- *     printf("%d\n", cur);
- * }
- * This will display the position of each bit set in ul: 1, 2, 4, 8
- *
- * I should probably re-think the implementation...
- */
-#define bit_for_each64(pos, tmp, ul)                                    \
-    for (tmp = ul, pos = ffs64(tmp); tmp; tmp &= (tmp - 1),  pos = ffs64(tmp))
-
-#define bit_for_each32(pos, tmp, ul)                                    \
-    for (tmp = ul, pos = ffs32(tmp); tmp; tmp &= (tmp - 1),  pos = ffs32(tmp))
-
-/** or would it be more useful (counting bits from zero instead of 1) ?
- */
-#define bit_for_each64_2(pos, tmp, ul)                                  \
-    for (tmp = ul, pos = ctz64(tmp); tmp; tmp ^= 1UL << pos, pos = ctz64(tmp))
-
-#define bit_for_each32_2(pos, tmp, ul)                                  \
-    for (tmp = ul, pos = ctz32(tmp); tmp; tmp ^= 1U << pos, pos = ctz32(tmp))
-
-#endif  /* _BITS_H */

include/br.h

@@ -1,224 +0,0 @@
-/* br.h - misc macros.
- *
- * Copyright (C) 2021-2022 Bruno Raoult ("br")
- * Licensed under the GNU General Public License v3.0 or later.
- * Some rights reserved. See COPYING.
- *
- * You should have received a copy of the GNU General Public License along with this
- * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
- *
- * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
- *
- * Some parts are taken from Linux's kernel <linux/kernel.h> and others, and are :
- * SPDX-License-Identifier: GPL-2.0
- *
- * This header contains generic stuff.
- */
-
-#ifndef _BR_H
-#define _BR_H
-
-#include "struct-group.h"
-
-/* Indirect stringification.  Doing two levels allows the parameter to be a
- * macro itself.  For example, compile with -DFOO=bar, __stringify(FOO)
- * converts to "bar".
- */
-#define __stringify_1(x...)	#x
-#define __stringify(x...)	__stringify_1(x)
-
-/* generate a (maybe) unique id.
- */
-#define ___PASTE(x, y)      x##y
-#define __PASTE(x, y)       ___PASTE(x, y)
-#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
-
-/* unused/used parameters/functions
- * https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-unused-function-attribute
- * https://gcc.gnu.org/onlinedocs/gcc/Common-Type-Attributes.html#index-unused-type-attribute
- * https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-unused-variable-attribute
- * https://gcc.gnu.org/onlinedocs/gcc/Label-Attributes.html#index-unused-label-attribute
- * https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-used-function-attribute
- * https://gcc.gnu.org/onlinedocs/gcc/Common-Variable-Attributes.html#index-used-variable-attribute
- */
-#define __unused             __attribute__((__unused__))
-#define __used               __attribute__((__used__))
-
-/* see https://lkml.org/lkml/2018/3/20/845 for explanation of this monster
- */
-#define __is_constexpr(x) \
-	(sizeof(int) == sizeof(*(8 ? ((void *)((long)(x) * 0l)) : (int *)8)))
-
-/*
- * min()/max()/clamp() macros must accomplish three things:
- *
- * - avoid multiple evaluations of the arguments (so side-effects like
- *   "x++" happen only once) when non-constant.
- * - perform strict type-checking (to generate warnings instead of
- *   nasty runtime surprises). See the "unnecessary" pointer comparison
- *   in __typecheck().
- * - retain result as a constant expressions when called with only
- *   constant expressions (to avoid tripping VLA warnings in stack
- *   allocation usage).
- */
-#define __typecheck(x, y) \
-	(!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
-
-#define __no_side_effects(x, y) \
-		(__is_constexpr(x) && __is_constexpr(y))
-
-#define __safe_cmp(x, y) \
-		(__typecheck(x, y) && __no_side_effects(x, y))
-
-#define __cmp(x, y, op)	((x) op (y) ? (x) : (y))
-
-#define __cmp_once(x, y, unique_x, unique_y, op) ({	\
-		typeof(x) unique_x = (x);		\
-		typeof(y) unique_y = (y);		\
-		__cmp(unique_x, unique_y, op); })
-
-#define __careful_cmp(x, y, op) \
-	__builtin_choose_expr(__safe_cmp(x, y), \
-		__cmp(x, y, op), \
-		__cmp_once(x, y, __UNIQUE_ID(__x), __UNIQUE_ID(__y), op))
-
-#define __pure   __attribute__((__pure__))
-
-/**
- * min - return minimum of two values of the same or compatible types
- * @x: first value
- * @y: second value
- */
-#define min(x, y)	__careful_cmp(x, y, <)
-
-/**
- * max - return maximum of two values of the same or compatible types
- * @x: first value
- * @y: second value
- */
-#define max(x, y)	__careful_cmp(x, y, >)
-
-/**
- * min3 - return minimum of three values
- * @x: first value
- * @y: second value
- * @z: third value
- */
-#define min3(x, y, z) min((typeof(x))min(x, y), z)
-
-/**
- * max3 - return maximum of three values
- * @x: first value
- * @y: second value
- * @z: third value
- */
-#define max3(x, y, z) max((typeof(x))max(x, y), z)
-
-/**
- * min_not_zero - return the minimum that is _not_ zero, unless both are zero
- * @x: value1
- * @y: value2
- */
-#define min_not_zero(x, y) ({			\
-	typeof(x) __x = (x);			\
-	typeof(y) __y = (y);			\
-	__x == 0 ? __y : ((__y == 0) ? __x : min(__x, __y)); })
-
-/**
- * clamp - return a value clamped to a given range with strict typechecking
- * @val: current value
- * @lo: lowest allowable value
- * @hi: highest allowable value
- *
- * This macro does strict typechecking of @lo/@hi to make sure they are of the
- * same type as @val.  See the unnecessary pointer comparisons.
- */
-#define clamp(val, lo, hi) min((typeof(val))max(val, lo), hi)
-
-/*
- * ..and if you can't take the strict
- * types, you can specify one yourself.
- *
- * Or not use min/max/clamp at all, of course.
- */
-
-/**
- * min_t - return minimum of two values, using the specified type
- * @type: data type to use
- * @x: first value
- * @y: second value
- */
-#define min_t(type, x, y)	__careful_cmp((type)(x), (type)(y), <)
-
-/**
- * max_t - return maximum of two values, using the specified type
- * @type: data type to use
- * @x: first value
- * @y: second value
- */
-#define max_t(type, x, y)	__careful_cmp((type)(x), (type)(y), >)
-
-/**
- * clamp_t - return a value clamped to a given range using a given type
- * @type: the type of variable to use
- * @val: current value
- * @lo: minimum allowable value
- * @hi: maximum allowable value
- *
- * This macro does no typechecking and uses temporary variables of type
- * @type to make all the comparisons.
- */
-#define clamp_t(type, val, lo, hi) min_t(type, max_t(type, val, lo), hi)
-
-/**
- * clamp_val - return a value clamped to a given range using val's type
- * @val: current value
- * @lo: minimum allowable value
- * @hi: maximum allowable value
- *
- * This macro does no typechecking and uses temporary variables of whatever
- * type the input argument @val is.  This is useful when @val is an unsigned
- * type and @lo and @hi are literals that will otherwise be assigned a signed
- * integer type.
- */
-#define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi)
-
-/**
- * swap - swap values of @a and @b
- * @a: first value
- * @b: second value
- */
-#define swap(a, b) \
-	do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
-
-/**
- * ARRAY_SIZE - get the number of elements in array @arr
- * @arr: array to be sized
- */
-#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
-
-/**
- * abs - return absolute value of an argument
- * @x: the value.  If it is unsigned type, it is converted to signed type first.
- *     char is treated as if it was signed (regardless of whether it really is)
- *     but the macro's return type is preserved as char.
- *
- * Return: an absolute value of x.
- */
-#define abs(x)	__abs_choose_expr(x, long long,				\
-		__abs_choose_expr(x, long,				\
-		__abs_choose_expr(x, int,				\
-		__abs_choose_expr(x, short,				\
-		__abs_choose_expr(x, char,				\
-		__builtin_choose_expr(					\
-			__builtin_types_compatible_p(typeof(x), char),	\
-			(char)({ signed char __x = (x); __x<0?-__x:__x; }), \
-			((void)0)))))))
-
-#define __abs_choose_expr(x, type, other) __builtin_choose_expr(	\
-	__builtin_types_compatible_p(typeof(x),   signed type) ||	\
-	__builtin_types_compatible_p(typeof(x), unsigned type),		\
-	({ signed type __x = (x); __x < 0 ? -__x : __x; }), other)
-
-
-#endif  /* _BR_H */

include/bug.h

@@ -1,71 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _BR_BUG_H
-#define _BR_BUG_H
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include "likely.h"
-#include "debug.h"
-
-/* BUG functions inspired by Linux kernel's <asm/bug.h>
- */
-
-#define panic() exit(0xff)
-
-/*
- * Don't use BUG() or BUG_ON() unless there's really no way out; one
- * example might be detecting data structure corruption in the middle
- * of an operation that can't be backed out of.  If the (sub)system
- * can somehow continue operating, perhaps with reduced functionality,
- * it's probably not BUG-worthy.
- *
- * If you're tempted to BUG(), think again:  is completely giving up
- * really the *only* solution?  There are usually better options, where
- * users don't need to reboot ASAP and can mostly shut down cleanly.
- */
-#define BUG() do {                                                                      \
-        fprintf(stderr, "BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \
-        panic();                                                                        \
-    } while (0)
-
-#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0)
-
-/*
- * WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report
- * significant kernel issues that need prompt attention if they should ever
- * appear at runtime.
- *
- * Do not use these macros when checking for invalid external inputs
- * (e.g. invalid system call arguments, or invalid data coming from
- * network/devices), and on transient conditions like ENOMEM or EAGAIN.
- * These macros should be used for recoverable kernel issues only.
- * For invalid external inputs, transient conditions, etc use
- * pr_err[_once/_ratelimited]() followed by dump_stack(), if necessary.
- * Do not include "BUG"/"WARNING" in format strings manually to make these
- * conditions distinguishable from kernel issues.
- *
- * Use the versions with printk format strings to provide better diagnostics.
- */
-#define __WARN() do {                                                      \
-        fprintf(stderr, "WARNING: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \
-    } while (0)
-#define __WARN_printf(arg...) do {              \
-        vfprintf(stderr, arg);                  \
-    } while (0)
-
-#define WARN_ON(condition) ({                   \
-            int __ret_warn_on = !!(condition);  \
-            if (unlikely(__ret_warn_on))        \
-		__WARN();                       \
-            unlikely(__ret_warn_on);            \
-        })
-
-#define WARN(condition, format...) ({           \
-            int __ret_warn_on = !!(condition);  \
-            if (unlikely(__ret_warn_on))        \
-		__WARN_printf(format);          \
-            unlikely(__ret_warn_on);            \
-        })
-
-#endif /* _BR_BUG_H */

include/container-of.h

@@ -1,30 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-
-/* adaptation of Linux kernel's <linux/container_of.h>
- */
-#ifndef _BR_CONTAINER_OF_H
-#define _BR_CONTAINER_OF_H
-
-/* Are two types/vars the same type (ignoring qualifiers)? */
-#define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
-
-/**
- * typeof_member -
- */
-#define typeof_member(T, m)     typeof(((T*)0)->m)
-
-/**
- * container_of - cast a member of a structure out to the containing structure
- * @ptr:        the pointer to the member.
- * @type:       the type of the container struct this is embedded in.
- * @member:     the name of the member within the struct.
- *
- */
-#define container_of(ptr, type, member) ({                              \
-        void *__mptr = (void *)(ptr);                                   \
-        _Static_assert(__same_type(*(ptr), ((type *)0)->member) ||       \
-                      __same_type(*(ptr), void),                        \
-                      "pointer type mismatch in container_of()");       \
-        ((type *)(__mptr - offsetof(type, member))); })
-
-#endif /* BR_CONTAINER_OF_H */

include/debug.h

@@ -1,115 +0,0 @@
-/* debug.h - debug/log management.
- *
- * Copyright (C) 2021-2022 Bruno Raoult ("br")
- * Licensed under the GNU General Public License v3.0 or later.
- * Some rights reserved. See COPYING.
- *
- * You should have received a copy of the GNU General Public License along with this
- * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
- *
- * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
- *
- */
-
-#ifndef DEBUG_H
-#define DEBUG_H
-
-#include <stdio.h>
-#include <stdbool.h>
-#include <stdint.h>
-
-#include <br.h>
-
-#define NANOSEC  1000000000                       /* nano sec in sec */
-#define MILLISEC 1000000                          /* milli sec in sec */
-
-#define _printf __attribute__ ((format (printf, 6, 7)))
-
-#ifdef DEBUG_DEBUG
-
-void debug_init(int level, FILE *stream, bool flush);
-void debug_level_set(int level);
-int debug_level_get(void);
-void debug_stream_set(FILE *stream);
-long long debug_timer_elapsed(void);
-void debug_flush_set(bool flush);
-void _printf debug(int level, bool timestamp,
-                   int indent, const char *src,
-                   int line, const char *fmt, ...);
-
-#else  /* DEBUG_DEBUG */
-
-static inline void debug_init(__unused int level,
-                              __unused FILE *stream,
-                              __unused bool flush) {}
-static inline void debug_level_set(__unused int level) {}
-static inline int debug_level_get(void) {return 0;}
-static inline void debug_stream_set(__unused FILE *stream) {}
-static inline long long debug_timer_elapsed(void) {return 0LL;}
-static inline void debug_flush_set(__unused bool level) {}
-static inline void _printf debug(__unused int level, __unused bool timestamp,
-                                 __unused int indent, __unused const char *src,
-                                 __unused int line, __unused const char *fmt, ...) {}
-
-#endif  /* DEBUG_DEBUG */
-
-#undef _printf
-
-/**
- * log - simple log (no function name, no indent, no timestamp)
- * @level:      log level
- * @fmt:        printf format string
- * @args:       subsequent arguments to printf
- */
-#define log(level, fmt, args...) \
-    debug((level), false, 0, NULL, 0, fmt, ##args)
-
-/**
- * log_i - log with indent (no function name, no timestamp)
- * @level:      log level
- * @fmt:        printf format string
- * @args:       subsequent arguments to printf
- *
- * Output example:
- * >>>>val=2
- */
-#define log_i(level, fmt, args...) \
-    debug((level), false, (level), NULL, 0, fmt, ##args)
-
-/**
- * log_f - log with function name (no indent name, no timestamp)
- * @level:      log level
- * @fmt:        printf format string
- * @args:       subsequent arguments to printf
- *
- * Output example:
- * [function] val=2
- */
-#define log_f(level, fmt, args...) \
-    debug((level), false, 0, __func__, 0, fmt, ##args)
-
-/**
- * log_if - log with function name and line number (no indent name, no timestamp)
- * @level:      log level
- * @fmt:        printf format string
- * @args:       subsequent arguments to printf
- *
- * Output example:
- * >>>> [function:15] val=2
- */
-#define log_if(level, fmt, args...) \
-    debug((level), false, (level), __func__, __LINE__, fmt, ##args)
-
-/**
- * log_it - log with function name, line number, indent, and timestamp
- * @level:      log level
- * @fmt:        printf format string
- * @args:       subsequent arguments to printf
- *
- * Output example:
- * >>>> [function:15] val=2
- */
-#define log_it(level, fmt, args...) \
-    debug((level), true, (level), __func__, __LINE__, fmt, ##args)
-
-#endif /* DEBUG_H */

include/hash.h

@@ -1,172 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-
-#ifndef _BR_HASH_H
-#define _BR_HASH_H
-/* adaptation of Linux kernel's <linux/hash.h> and <linux/stringhash.h>
- */
-
-/* Fast hashing routine for ints,  longs and pointers.
-   (C) 2002 Nadia Yvette Chambers, IBM */
-
-#include <asm/bitsperlong.h>
-#include "bits.h"
-#include "br.h"
-
-/*
- * The "GOLDEN_RATIO_PRIME" is used in ifs/btrfs/brtfs_inode.h and
- * fs/inode.c.  It's not actually prime any more (the previous primes
- * were actively bad for hashing), but the name remains.
- */
-#if __BITS_PER_LONG == 32
-#define GOLDEN_RATIO_PRIME GOLDEN_RATIO_32
-#define hash_long(val, bits) hash_32(val, bits)
-#elif __BITS_PER_LONG == 64
-#define hash_long(val, bits) hash_64(val, bits)
-#define GOLDEN_RATIO_PRIME GOLDEN_RATIO_64
-#else
-#error Wordsize not 32 or 64
-#endif
-
-/*
- * This hash multiplies the input by a large odd number and takes the
- * high bits.  Since multiplication propagates changes to the most
- * significant end only, it is essential that the high bits of the
- * product be used for the hash value.
- *
- * Chuck Lever verified the effectiveness of this technique:
- * http://www.citi.umich.edu/techreports/reports/citi-tr-00-1.pdf
- *
- * Although a random odd number will do, it turns out that the golden
- * ratio phi = (sqrt(5)-1)/2, or its negative, has particularly nice
- * properties.  (See Knuth vol 3, section 6.4, exercise 9.)
- *
- * These are the negative, (1 - phi) = phi**2 = (3 - sqrt(5))/2,
- * which is very slightly easier to multiply by and makes no
- * difference to the hash distribution.
- */
-#define GOLDEN_RATIO_32 0x61C88647
-#define GOLDEN_RATIO_64 0x61C8864680B583EBull
-
-/*
- * The _generic versions exist only so lib/test_hash.c can compare
- * the arch-optimized versions with the generic.
- *
- * Note that if you change these, any <asm/hash.h> that aren't updated
- * to match need to have their HAVE_ARCH_* define values updated so the
- * self-test will not false-positive.
- */
-#ifndef HAVE_ARCH__HASH_32
-#define __hash_32 __hash_32_generic
-#endif
-static inline u32 __hash_32_generic(u32 val)
-{
-	return val * GOLDEN_RATIO_32;
-}
-
-static inline u32 hash_32(u32 val, unsigned int bits)
-{
-	/* High bits are more random, so use them. */
-	return __hash_32(val) >> (32 - bits);
-}
-
-#ifndef HAVE_ARCH_HASH_64
-#define hash_64 hash_64_generic
-#endif
-static __always_inline u32 hash_64_generic(u64 val, unsigned int bits)
-{
-#if __BITS_PER_LONG == 64
-	/* 64x64-bit multiply is efficient on all 64-bit processors */
-	return val * GOLDEN_RATIO_64 >> (64 - bits);
-#else
-	/* Hash 64 bits using only 32x32-bit multiply. */
-	return hash_32((u32)val ^ __hash_32(val >> 32), bits);
-#endif
-}
-
-static inline u32 hash_ptr(const void *ptr, unsigned int bits)
-{
-	return hash_long((unsigned long)ptr, bits);
-}
-
-/* This really should be called fold32_ptr; it does no hashing to speak of. */
-static inline u32 hash32_ptr(const void *ptr)
-{
-	unsigned long val = (unsigned long)ptr;
-
-#if __BITS_PER_LONG == 64
-	val ^= (val >> 32);
-#endif
-	return (u32)val;
-}
-
-/*
- * Routines for hashing strings of bytes to a 32-bit hash value.
- *
- * These hash functions are NOT GUARANTEED STABLE between kernel
- * versions, architectures, or even repeated boots of the same kernel.
- * (E.g. they may depend on boot-time hardware detection or be
- * deliberately randomized.)
- *
- * They are also not intended to be secure against collisions caused by
- * malicious inputs; much slower hash functions are required for that.
- *
- * They are optimized for pathname components, meaning short strings.
- * Even if a majority of files have longer names, the dynamic profile of
- * pathname components skews short due to short directory names.
- * (E.g. /usr/lib/libsesquipedalianism.so.3.141.)
- */
-
-/*
- * Version 1: one byte at a time.  Example of use:
- *
- * unsigned long hash = init_name_hash;
- * while (*p)
- *	hash = partial_name_hash(tolower(*p++), hash);
- * hash = end_name_hash(hash);
- *
- * Although this is designed for bytes, fs/hfsplus/unicode.c
- * abuses it to hash 16-bit values.
- */
-
-/* Hash courtesy of the R5 hash in reiserfs modulo sign bits */
-#define init_name_hash(salt)		(unsigned long)(salt)
-
-/* partial hash update function. Assume roughly 4 bits per character */
-static inline unsigned long
-partial_name_hash(unsigned long c, unsigned long prevhash)
-{
-	return (prevhash + (c << 4) + (c >> 4)) * 11;
-}
-
-/*
- * Finally: cut down the number of bits to a int value (and try to avoid
- * losing bits).  This also has the property (wanted by the dcache)
- * that the msbits make a good hash table index.
- */
-static inline unsigned int end_name_hash(unsigned long hash)
-{
-	return hash_long(hash, 32);
-}
-
-/*
- * Version 2: One word (32 or 64 bits) at a time.
- * If CONFIG_DCACHE_WORD_ACCESS is defined (meaning <asm/word-at-a-time.h>
- * exists, which describes major Linux platforms like x86 and ARM), then
- * this computes a different hash function much faster.
- *
- * If not set, this falls back to a wrapper around the preceding.
- */
-extern unsigned int __pure hash_string(const void *salt, const char *, unsigned int);
-
-/*
- * A hash_len is a u64 with the hash of a string in the low
- * half and the length in the high half.
- */
-#define hashlen_hash(hashlen) ((u32)(hashlen))
-#define hashlen_len(hashlen)  ((u32)((hashlen) >> 32))
-#define hashlen_create(hash, len) ((u64)(len)<<32 | (u32)(hash))
-
-/* Return the "hash_len" (hash and length) of a null-terminated string */
-extern u64 __pure hashlen_string(const void *salt, const char *name);
-
-#endif /* _BR_HASH_H */

include/hashtable.h

@@ -1,202 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/* adaptation of Linux kernel's <linux/hashtable.h>
- */
-
-
-/*
- * Statically sized hash table implementation
- * (C) 2012  Sasha Levin <levinsasha928@gmail.com>
- */
-
-#ifndef _LINUX_HASHTABLE_H
-#define _LINUX_HASHTABLE_H
-
-#include "list.h"
-#include "hash.h"
-//#include <linux/rculist.h>
-
-#define DEFINE_HASHTABLE(name, bits)						\
-	struct hlist_head name[1 << (bits)] =					\
-			{ [0 ... ((1 << (bits)) - 1)] = HLIST_HEAD_INIT }
-
-#define DEFINE_READ_MOSTLY_HASHTABLE(name, bits)				\
-	struct hlist_head name[1 << (bits)] __read_mostly =			\
-			{ [0 ... ((1 << (bits)) - 1)] = HLIST_HEAD_INIT }
-
-#define DECLARE_HASHTABLE(name, bits)                                   	\
-	struct hlist_head name[1 << (bits)]
-
-#define HASH_SIZE(name) (ARRAY_SIZE(name))
-#define HASH_BITS(name) ilog2(HASH_SIZE(name))
-
-/* Use hash_32 when possible to allow for fast 32bit hashing in 64bit kernels. */
-#define hash_min(val, bits)							\
-	(sizeof(val) <= 4 ? hash_32(val, bits) : hash_long(val, bits))
-
-static inline void __hash_init(struct hlist_head *ht, unsigned int sz)
-{
-	unsigned int i;
-
-	for (i = 0; i < sz; i++)
-		INIT_HLIST_HEAD(&ht[i]);
-}
-
-/**
- * hash_init - initialize a hash table
- * @hashtable: hashtable to be initialized
- *
- * Calculates the size of the hashtable from the given parameter, otherwise
- * same as hash_init_size.
- *
- * This has to be a macro since HASH_BITS() will not work on pointers since
- * it calculates the size during preprocessing.
- */
-#define hash_init(hashtable) __hash_init(hashtable, HASH_SIZE(hashtable))
-
-/**
- * hash_add - add an object to a hashtable
- * @hashtable: hashtable to add to
- * @node: the &struct hlist_node of the object to be added
- * @key: the key of the object to be added
- */
-#define hash_add(hashtable, node, key)						\
-	hlist_add_head(node, &hashtable[hash_min(key, HASH_BITS(hashtable))])
-
-/**
- * hash_add_rcu - add an object to a rcu enabled hashtable
- * @hashtable: hashtable to add to
- * @node: the &struct hlist_node of the object to be added
- * @key: the key of the object to be added
- */
-#define hash_add_rcu(hashtable, node, key)					\
-	hlist_add_head_rcu(node, &hashtable[hash_min(key, HASH_BITS(hashtable))])
-
-/**
- * hash_hashed - check whether an object is in any hashtable
- * @node: the &struct hlist_node of the object to be checked
- */
-static inline bool hash_hashed(struct hlist_node *node)
-{
-	return !hlist_unhashed(node);
-}
-
-static inline bool __hash_empty(struct hlist_head *ht, unsigned int sz)
-{
-	unsigned int i;
-
-	for (i = 0; i < sz; i++)
-		if (!hlist_empty(&ht[i]))
-			return false;
-
-	return true;
-}
-
-/**
- * hash_empty - check whether a hashtable is empty
- * @hashtable: hashtable to check
- *
- * This has to be a macro since HASH_BITS() will not work on pointers since
- * it calculates the size during preprocessing.
- */
-#define hash_empty(hashtable) __hash_empty(hashtable, HASH_SIZE(hashtable))
-
-/**
- * hash_del - remove an object from a hashtable
- * @node: &struct hlist_node of the object to remove
- */
-static inline void hash_del(struct hlist_node *node)
-{
-	hlist_del_init(node);
-}
-
-/**
- * hash_for_each - iterate over a hashtable
- * @name: hashtable to iterate
- * @bkt: integer to use as bucket loop cursor
- * @obj: the type * to use as a loop cursor for each entry
- * @member: the name of the hlist_node within the struct
- */
-#define hash_for_each(name, bkt, obj, member)				\
-	for ((bkt) = 0, obj = NULL; obj == NULL && (bkt) < HASH_SIZE(name);\
-			(bkt)++)\
-		hlist_for_each_entry(obj, &name[bkt], member)
-
-/**
- * hash_for_each_rcu - iterate over a rcu enabled hashtable
- * @name: hashtable to iterate
- * @bkt: integer to use as bucket loop cursor
- * @obj: the type * to use as a loop cursor for each entry
- * @member: the name of the hlist_node within the struct
- */
-#define hash_for_each_rcu(name, bkt, obj, member)			\
-	for ((bkt) = 0, obj = NULL; obj == NULL && (bkt) < HASH_SIZE(name);\
-			(bkt)++)\
-		hlist_for_each_entry_rcu(obj, &name[bkt], member)
-
-/**
- * hash_for_each_safe - iterate over a hashtable safe against removal of
- * hash entry
- * @name: hashtable to iterate
- * @bkt: integer to use as bucket loop cursor
- * @tmp: a &struct hlist_node used for temporary storage
- * @obj: the type * to use as a loop cursor for each entry
- * @member: the name of the hlist_node within the struct
- */
-#define hash_for_each_safe(name, bkt, tmp, obj, member)			\
-	for ((bkt) = 0, obj = NULL; obj == NULL && (bkt) < HASH_SIZE(name);\
-			(bkt)++)\
-		hlist_for_each_entry_safe(obj, tmp, &name[bkt], member)
-
-/**
- * hash_for_each_possible - iterate over all possible objects hashing to the
- * same bucket
- * @name: hashtable to iterate
- * @obj: the type * to use as a loop cursor for each entry
- * @member: the name of the hlist_node within the struct
- * @key: the key of the objects to iterate over
- */
-#define hash_for_each_possible(name, obj, member, key)			\
-	hlist_for_each_entry(obj, &name[hash_min(key, HASH_BITS(name))], member)
-
-/**
- * hash_for_each_possible_rcu - iterate over all possible objects hashing to the
- * same bucket in an rcu enabled hashtable
- * @name: hashtable to iterate
- * @obj: the type * to use as a loop cursor for each entry
- * @member: the name of the hlist_node within the struct
- * @key: the key of the objects to iterate over
- */
-#define hash_for_each_possible_rcu(name, obj, member, key, cond...)	\
-	hlist_for_each_entry_rcu(obj, &name[hash_min(key, HASH_BITS(name))],\
-		member, ## cond)
-
-/**
- * hash_for_each_possible_rcu_notrace - iterate over all possible objects hashing
- * to the same bucket in an rcu enabled hashtable in a rcu enabled hashtable
- * @name: hashtable to iterate
- * @obj: the type * to use as a loop cursor for each entry
- * @member: the name of the hlist_node within the struct
- * @key: the key of the objects to iterate over
- *
- * This is the same as hash_for_each_possible_rcu() except that it does
- * not do any RCU debugging or tracing.
- */
-#define hash_for_each_possible_rcu_notrace(name, obj, member, key) \
-	hlist_for_each_entry_rcu_notrace(obj, \
-		&name[hash_min(key, HASH_BITS(name))], member)
-
-/**
- * hash_for_each_possible_safe - iterate over all possible objects hashing to the
- * same bucket safe against removals
- * @name: hashtable to iterate
- * @obj: the type * to use as a loop cursor for each entry
- * @tmp: a &struct hlist_node used for temporary storage
- * @member: the name of the hlist_node within the struct
- * @key: the key of the objects to iterate over
- */
-#define hash_for_each_possible_safe(name, obj, tmp, member, key)	\
-	hlist_for_each_entry_safe(obj, tmp,\
-		&name[hash_min(key, HASH_BITS(name))], member)
-
-
-#endif

include/likely.h

@@ -1,18 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-
-/*  taken from Kernel's <linux/compiler.h
- */
-#ifndef __LIKELY_H
-#define __LIKELY_H
-
-/* See https://kernelnewbies.org/FAQ/LikelyUnlikely
- *
- * In 2 words:
- * "You should use it [likely() and unlikely()] only in cases when the likeliest
- *  branch is very very very likely, or when the unlikeliest branch is very very
- *  very unlikely."
- */
-# define likely(x)      __builtin_expect(!!(x), 1)
-# define unlikely(x)    __builtin_expect(!!(x), 0)
-
-#endif /* __LIKELY_H */

include/list.h

@@ -1,992 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-
-/* adaptation of kernel's <linux/list.h>
- *
- */
-
-#ifndef __BR_LIST_H
-#define __BR_LIST_H
-
-#include <stddef.h>
-#include <stdbool.h>
-#include "rwonce.h"
-#include "container-of.h"
-
-/************ originally in <include/linux/types.h> */
-struct list_head {
-    struct list_head *next, *prev;
-};
-struct hlist_head {
-    struct hlist_node *first;
-};
-
-struct hlist_node {
-    struct hlist_node *next, **pprev;
-};
-
-/************ originally in <include/linux/poison.h> */
-# define POISON_POINTER_DELTA 0
-/* These are non-NULL pointers that will result in page faults
- * under normal circumstances, used to verify that nobody uses
- * non-initialized list entries.
- */
-#define LIST_POISON1  ((void *) 0x100 + POISON_POINTER_DELTA)
-#define LIST_POISON2  ((void *) 0x200 + POISON_POINTER_DELTA)
-
-/*
- * Circular doubly linked list implementation.
- *
- * Some of the internal functions ("__xxx") are useful when
- * manipulating whole lists rather than single entries, as
- * sometimes we already know the next/prev entries and we can
- * generate better code by using them directly rather than
- * using the generic single-entry routines.
- */
-
-#define LIST_HEAD_INIT(name) { &(name), &(name) }
-
-#define LIST_HEAD(name)                                 \
-    struct list_head name = LIST_HEAD_INIT(name)
-
-/**
- * INIT_LIST_HEAD - Initialize a list_head structure
- * @list: list_head structure to be initialized.
- *
- * Initializes the list_head to point to itself.  If it is a list header,
- * the result is an empty list.
- */
-static inline void INIT_LIST_HEAD(struct list_head *list)
-{
-    WRITE_ONCE(list->next, list);
-    list->prev = list;
-}
-
-/*
- * Insert a new entry between two known consecutive entries.
- *
- * This is only for internal list manipulation where we know
- * the prev/next entries already!
- */
-static inline void __list_add(struct list_head *new,
-			      struct list_head *prev,
-			      struct list_head *next)
-{
-    next->prev = new;
-    new->next  = next;
-    new->prev  = prev;
-    WRITE_ONCE(prev->next, new);
-}
-
-/**
- * list_add - add a new entry
- * @new: new entry to be added
- * @head: list head to add it after
- *
- * Insert a new entry after the specified head.
- * This is good for implementing stacks.
- */
-static inline void list_add(struct list_head *new, struct list_head *head)
-{
-    __list_add(new, head, head->next);
-}
-
-
-/**
- * list_add_tail - add a new entry
- * @new: new entry to be added
- * @head: list head to add it before
- *
- * Insert a new entry before the specified head.
- * This is useful for implementing queues.
- */
-static inline void list_add_tail(struct list_head *new, struct list_head *head)
-{
-    __list_add(new, head->prev, head);
-}
-
-/*
- * Delete a list entry by making the prev/next entries
- * point to each other.
- *
- * This is only for internal list manipulation where we know
- * the prev/next entries already!
- */
-static inline void __list_del(struct list_head * prev, struct list_head * next)
-{
-    next->prev = prev;
-    WRITE_ONCE(prev->next, next);
-}
-
-/*
- * Delete a list entry and clear the 'prev' pointer.
- *
- * This is a special-purpose list clearing method used in the networking code
- * for lists allocated as per-cpu, where we don't want to incur the extra
- * WRITE_ONCE() overhead of a regular list_del_init(). The code that uses this
- * needs to check the node 'prev' pointer instead of calling list_empty().
- */
-static inline void __list_del_clearprev(struct list_head *entry)
-{
-    __list_del(entry->prev, entry->next);
-    entry->prev = NULL;
-}
-
-static inline void __list_del_entry(struct list_head *entry)
-{
-    __list_del(entry->prev, entry->next);
-}
-
-/**
- * list_del - deletes entry from list.
- * @entry: the element to delete from the list.
- * Note: list_empty() on entry does not return true after this, the entry is
- * in an undefined state.
- */
-static inline void list_del(struct list_head *entry)
-{
-    __list_del_entry(entry);
-    entry->next = LIST_POISON1;
-    entry->prev = LIST_POISON2;
-}
-
-/**
- * list_replace - replace old entry by new one
- * @old : the element to be replaced
- * @new : the new element to insert
- *
- * If @old was empty, it will be overwritten.
- */
-static inline void list_replace(struct list_head *old,
-				struct list_head *new)
-{
-    new->next = old->next;
-    new->next->prev = new;
-    new->prev = old->prev;
-    new->prev->next = new;
-}
-
-/**
- * list_replace_init - replace old entry by new one and initialize the old one
- * @old : the element to be replaced
- * @new : the new element to insert
- *
- * If @old was empty, it will be overwritten.
- */
-static inline void list_replace_init(struct list_head *old,
-				     struct list_head *new)
-{
-    list_replace(old, new);
-    INIT_LIST_HEAD(old);
-}
-
-/**
- * list_swap - replace entry1 with entry2 and re-add entry1 at entry2's position
- * @entry1: the location to place entry2
- * @entry2: the location to place entry1
- */
-static inline void list_swap(struct list_head *entry1,
-			     struct list_head *entry2)
-{
-    struct list_head *pos = entry2->prev;
-
-    list_del(entry2);
-    list_replace(entry1, entry2);
-    if (pos == entry1)
-        pos = entry2;
-    list_add(entry1, pos);
-}
-
-/**
- * list_del_init - deletes entry from list and reinitialize it.
- * @entry: the element to delete from the list.
- */
-static inline void list_del_init(struct list_head *entry)
-{
-    __list_del_entry(entry);
-    INIT_LIST_HEAD(entry);
-}
-
-/**
- * list_move - delete from one list and add as another's head
- * @list: the entry to move
- * @head: the head that will precede our entry
- */
-static inline void list_move(struct list_head *list, struct list_head *head)
-{
-    __list_del_entry(list);
-    list_add(list, head);
-}
-
-/**
- * list_move_tail - delete from one list and add as another's tail
- * @list: the entry to move
- * @head: the head that will follow our entry
- */
-static inline void list_move_tail(struct list_head *list,
-				  struct list_head *head)
-{
-    __list_del_entry(list);
-    list_add_tail(list, head);
-}
-
-/**
- * list_bulk_move_tail - move a subsection of a list to its tail
- * @head: the head that will follow our entry
- * @first: first entry to move
- * @last: last entry to move, can be the same as first
- *
- * Move all entries between @first and including @last before @head.
- * All three entries must belong to the same linked list.
- */
-static inline void list_bulk_move_tail(struct list_head *head,
-				       struct list_head *first,
-				       struct list_head *last)
-{
-    first->prev->next = last->next;
-    last->next->prev = first->prev;
-
-    head->prev->next = first;
-    first->prev = head->prev;
-
-    last->next = head;
-    head->prev = last;
-}
-
-/**
- * list_is_first -- tests whether @list is the first entry in list @head
- * @list: the entry to test
- * @head: the head of the list
- */
-static inline int list_is_first(const struct list_head *list,
-                                const struct list_head *head)
-{
-    return list->prev == head;
-}
-
-/**
- * list_is_last - tests whether @list is the last entry in list @head
- * @list: the entry to test
- * @head: the head of the list
- */
-static inline int list_is_last(const struct list_head *list,
-                               const struct list_head *head)
-{
-    return list->next == head;
-}
-
-/**
- * list_empty - tests whether a list is empty
- * @head: the list to test.
- */
-static inline int list_empty(const struct list_head *head)
-{
-    return READ_ONCE(head->next) == head;
-}
-
-/**
- * list_rotate_left - rotate the list to the left
- * @head: the head of the list
- */
-static inline void list_rotate_left(struct list_head *head)
-{
-    struct list_head *first;
-
-    if (!list_empty(head)) {
-        first = head->next;
-        list_move_tail(first, head);
-    }
-}
-
-/**
- * list_rotate_to_front() - Rotate list to specific item.
- * @list: The desired new front of the list.
- * @head: The head of the list.
- *
- * Rotates list so that @list becomes the new front of the list.
- */
-static inline void list_rotate_to_front(struct list_head *list,
-					struct list_head *head)
-{
-    /*
-     * Deletes the list head from the list denoted by @head and
-     * places it as the tail of @list, this effectively rotates the
-     * list so that @list is at the front.
-     */
-    list_move_tail(head, list);
-}
-
-/**
- * list_is_singular - tests whether a list has just one entry.
- * @head: the list to test.
- */
-static inline int list_is_singular(const struct list_head *head)
-{
-    return !list_empty(head) && (head->next == head->prev);
-}
-
-static inline void __list_cut_position(struct list_head *list,
-                                       struct list_head *head, struct list_head *entry)
-{
-    struct list_head *new_first = entry->next;
-    list->next = head->next;
-    list->next->prev = list;
-    list->prev = entry;
-    entry->next = list;
-    head->next = new_first;
-    new_first->prev = head;
-}
-
-/**
- * list_cut_position - cut a list into two
- * @list: a new list to add all removed entries
- * @head: a list with entries
- * @entry: an entry within head, could be the head itself
- *	and if so we won't cut the list
- *
- * This helper moves the initial part of @head, up to and
- * including @entry, from @head to @list. You should
- * pass on @entry an element you know is on @head. @list
- * should be an empty list or a list you do not care about
- * losing its data.
- *
- */
-static inline void list_cut_position(struct list_head *list,
-                                     struct list_head *head, struct list_head *entry)
-{
-    if (list_empty(head))
-        return;
-    if (list_is_singular(head) &&
-        (head->next != entry && head != entry))
-        return;
-    if (entry == head)
-        INIT_LIST_HEAD(list);
-    else
-        __list_cut_position(list, head, entry);
-}
-
-/**
- * list_cut_before - cut a list into two, before given entry
- * @list: a new list to add all removed entries
- * @head: a list with entries
- * @entry: an entry within head, could be the head itself
- *
- * This helper moves the initial part of @head, up to but
- * excluding @entry, from @head to @list.  You should pass
- * in @entry an element you know is on @head.  @list should
- * be an empty list or a list you do not care about losing
- * its data.
- * If @entry == @head, all entries on @head are moved to
- * @list.
- */
-static inline void list_cut_before(struct list_head *list,
-				   struct list_head *head,
-				   struct list_head *entry)
-{
-    if (head->next == entry) {
-        INIT_LIST_HEAD(list);
-        return;
-    }
-    list->next = head->next;
-    list->next->prev = list;
-    list->prev = entry->prev;
-    list->prev->next = list;
-    head->next = entry;
-    entry->prev = head;
-}
-
-static inline void __list_splice(const struct list_head *list,
-				 struct list_head *prev,
-				 struct list_head *next)
-{
-    struct list_head *first = list->next;
-    struct list_head *last = list->prev;
-
-    first->prev = prev;
-    prev->next = first;
-
-    last->next = next;
-    next->prev = last;
-}
-
-/**
- * list_splice - join two lists, this is designed for stacks
- * @list: the new list to add.
- * @head: the place to add it in the first list.
- */
-static inline void list_splice(const struct list_head *list,
-                               struct list_head *head)
-{
-    if (!list_empty(list))
-        __list_splice(list, head, head->next);
-}
-
-/**
- * list_splice_tail - join two lists, each list being a queue
- * @list: the new list to add.
- * @head: the place to add it in the first list.
- */
-static inline void list_splice_tail(struct list_head *list,
-                                    struct list_head *head)
-{
-    if (!list_empty(list))
-        __list_splice(list, head->prev, head);
-}
-
-/**
- * list_splice_init - join two lists and reinitialise the emptied list.
- * @list: the new list to add.
- * @head: the place to add it in the first list.
- *
- * The list at @list is reinitialised
- */
-static inline void list_splice_init(struct list_head *list,
-				    struct list_head *head)
-{
-    if (!list_empty(list)) {
-        __list_splice(list, head, head->next);
-        INIT_LIST_HEAD(list);
-    }
-}
-
-/**
- * list_splice_tail_init - join two lists and reinitialise the emptied list
- * @list: the new list to add.
- * @head: the place to add it in the first list.
- *
- * Each of the lists is a queue.
- * The list at @list is reinitialised
- */
-static inline void list_splice_tail_init(struct list_head *list,
-					 struct list_head *head)
-{
-    if (!list_empty(list)) {
-        __list_splice(list, head->prev, head);
-        INIT_LIST_HEAD(list);
-    }
-}
-
-/**
- * list_entry - get the struct for this entry
- * @ptr:	the &struct list_head pointer.
- * @type:	the type of the struct this is embedded in.
- * @member:	the name of the list_head within the struct.
- */
-#define list_entry(ptr, type, member)           \
-    container_of(ptr, type, member)
-
-/**
- * list_first_entry - get the first element from a list
- * @ptr:	the list head to take the element from.
- * @type:	the type of the struct this is embedded in.
- * @member:	the name of the list_head within the struct.
- *
- * Note, that list is expected to be not empty.
- */
-#define list_first_entry(ptr, type, member)     \
-    list_entry((ptr)->next, type, member)
-
-/**
- * list_last_entry - get the last element from a list
- * @ptr:	the list head to take the element from.
- * @type:	the type of the struct this is embedded in.
- * @member:	the name of the list_head within the struct.
- *
- * Note, that list is expected to be not empty.
- */
-#define list_last_entry(ptr, type, member)      \
-    list_entry((ptr)->prev, type, member)
-
-/**
- * list_first_entry_or_null - get the first element from a list
- * @ptr:	the list head to take the element from.
- * @type:	the type of the struct this is embedded in.
- * @member:	the name of the list_head within the struct.
- *
- * Note that if the list is empty, it returns NULL.
- */
-#define list_first_entry_or_null(ptr, type, member) ({                  \
-            struct list_head *head__ = (ptr);                           \
-            struct list_head *pos__ = READ_ONCE(head__->next);          \
-            pos__ != head__ ? list_entry(pos__, type, member) : NULL;   \
-        })
-
-/**
- * list_next_entry - get the next element in list
- * @pos:	the type * to cursor
- * @member:	the name of the list_head within the struct.
- */
-#define list_next_entry(pos, member)                            \
-    list_entry((pos)->member.next, __typeof__(*(pos)), member)
-
-/**
- * list_prev_entry - get the prev element in list
- * @pos:	the type * to cursor
- * @member:	the name of the list_head within the struct.
- */
-#define list_prev_entry(pos, member)                            \
-    list_entry((pos)->member.prev, __typeof__(*(pos)), member)
-
-/**
- * list_for_each	-	iterate over a list
- * @pos:	the &struct list_head to use as a loop cursor.
- * @head:	the head for your list.
- */
-#define list_for_each(pos, head)                                \
-    for (pos = (head)->next; pos != (head); pos = pos->next)
-
-/**
- * list_for_each_continue - continue iteration over a list
- * @pos:	the &struct list_head to use as a loop cursor.
- * @head:	the head for your list.
- *
- * Continue to iterate over a list, continuing after the current position.
- */
-#define list_for_each_continue(pos, head)                       \
-    for (pos = pos->next; pos != (head); pos = pos->next)
-
-/**
- * list_for_each_prev	-	iterate over a list backwards
- * @pos:	the &struct list_head to use as a loop cursor.
- * @head:	the head for your list.
- */
-#define list_for_each_prev(pos, head)                           \
-    for (pos = (head)->prev; pos != (head); pos = pos->prev)
-
-/**
- * list_for_each_safe - iterate over a list safe against removal of list entry
- * @pos:	the &struct list_head to use as a loop cursor.
- * @n:		another &struct list_head to use as temporary storage
- * @head:	the head for your list.
- */
-#define list_for_each_safe(pos, n, head)                        \
-    for (pos = (head)->next, n = pos->next; pos != (head);      \
-         pos = n, n = pos->next)
-
-/**
- * list_for_each_prev_safe - iterate over a list backwards safe against removal of list entry
- * @pos:	the &struct list_head to use as a loop cursor.
- * @n:		another &struct list_head to use as temporary storage
- * @head:	the head for your list.
- */
-#define list_for_each_prev_safe(pos, n, head)   \
-    for (pos = (head)->prev, n = pos->prev;     \
-         pos != (head);                         \
-         pos = n, n = pos->prev)
-
-/**
- * list_entry_is_head - test if the entry points to the head of the list
- * @pos:	the type * to cursor
- * @head:	the head for your list.
- * @member:	the name of the list_head within the struct.
- */
-#define list_entry_is_head(pos, head, member)   \
-    (&pos->member == (head))
-
-/**
- * list_for_each_entry	-	iterate over list of given type
- * @pos:	the type * to use as a loop cursor.
- * @head:	the head for your list.
- * @member:	the name of the list_head within the struct.
- */
-#define list_for_each_entry(pos, head, member)                  \
-    for (pos = list_first_entry(head, __typeof__(*pos), member);	\
-         !list_entry_is_head(pos, head, member);                \
-         pos = list_next_entry(pos, member))
-
-/**
- * list_for_each_entry_reverse - iterate backwards over list of given type.
- * @pos:	the type * to use as a loop cursor.
- * @head:	the head for your list.
- * @member:	the name of the list_head within the struct.
- */
-#define list_for_each_entry_reverse(pos, head, member)          \
-    for (pos = list_last_entry(head, __typeof__(*pos), member);     \
-         !list_entry_is_head(pos, head, member);                \
-         pos = list_prev_entry(pos, member))
-
-/**
- * list_prepare_entry - prepare a pos entry for use in list_for_each_entry_continue()
- * @pos:	the type * to use as a start point
- * @head:	the head of the list
- * @member:	the name of the list_head within the struct.
- *
- * Prepares a pos entry for use as a start point in list_for_each_entry_continue().
- */
-#define list_prepare_entry(pos, head, member)           \
-    ((pos) ? : list_entry(head, __typeof__(*pos), member))
-
-/**
- * list_for_each_entry_continue - continue iteration over list of given type
- * @pos:	the type * to use as a loop cursor.
- * @head:	the head for your list.
- * @member:	the name of the list_head within the struct.
- *
- * Continue to iterate over list of given type, continuing after
- * the current position.
- */
-#define list_for_each_entry_continue(pos, head, member) \
-    for (pos = list_next_entry(pos, member);            \
-         !list_entry_is_head(pos, head, member);        \
-         pos = list_next_entry(pos, member))
-
-/**
- * list_for_each_entry_continue_reverse - iterate backwards from the given point
- * @pos:	the type * to use as a loop cursor.
- * @head:	the head for your list.
- * @member:	the name of the list_head within the struct.
- *
- * Start to iterate over list of given type backwards, continuing after
- * the current position.
- */
-#define list_for_each_entry_continue_reverse(pos, head, member) \
-    for (pos = list_prev_entry(pos, member);			\
-         !list_entry_is_head(pos, head, member);                \
-         pos = list_prev_entry(pos, member))
-
-/**
- * list_for_each_entry_from - iterate over list of given type from the current point
- * @pos:	the type * to use as a loop cursor.
- * @head:	the head for your list.
- * @member:	the name of the list_head within the struct.
- *
- * Iterate over list of given type, continuing from current position.
- */
-#define list_for_each_entry_from(pos, head, member)     \
-    for (; !list_entry_is_head(pos, head, member);      \
-         pos = list_next_entry(pos, member))
-
-/**
- * list_for_each_entry_from_reverse - iterate backwards over list of given type
- *                                    from the current point
- * @pos:	the type * to use as a loop cursor.
- * @head:	the head for your list.
- * @member:	the name of the list_head within the struct.
- *
- * Iterate backwards over list of given type, continuing from current position.
- */
-#define list_for_each_entry_from_reverse(pos, head, member)     \
-    for (; !list_entry_is_head(pos, head, member);              \
-         pos = list_prev_entry(pos, member))
-
-/**
- * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry
- * @pos:	the type * to use as a loop cursor.
- * @n:		another type * to use as temporary storage
- * @head:	the head for your list.
- * @member:	the name of the list_head within the struct.
- */
-#define list_for_each_entry_safe(pos, n, head, member)          \
-    for (pos = list_first_entry(head, __typeof__(*pos), member),	\
-             n = list_next_entry(pos, member);			\
-         !list_entry_is_head(pos, head, member);                \
-         pos = n, n = list_next_entry(n, member))
-
-/**
- * list_for_each_entry_safe_continue - continue list iteration safe against removal
- * @pos:	the type * to use as a loop cursor.
- * @n:		another type * to use as temporary storage
- * @head:	the head for your list.
- * @member:	the name of the list_head within the struct.
- *
- * Iterate over list of given type, continuing after current point,
- * safe against removal of list entry.
- */
-#define list_for_each_entry_safe_continue(pos, n, head, member) \
-    for (pos = list_next_entry(pos, member),                    \
-             n = list_next_entry(pos, member);                  \
-         !list_entry_is_head(pos, head, member);                \
-         pos = n, n = list_next_entry(n, member))
-
-/**
- * list_for_each_entry_safe_from - iterate over list from current point safe against removal
- * @pos:	the type * to use as a loop cursor.
- * @n:		another type * to use as temporary storage
- * @head:	the head for your list.
- * @member:	the name of the list_head within the struct.
- *
- * Iterate over list of given type from current point, safe against
- * removal of list entry.
- */
-#define list_for_each_entry_safe_from(pos, n, head, member)     \
-    for (n = list_next_entry(pos, member);                      \
-         !list_entry_is_head(pos, head, member);                \
-         pos = n, n = list_next_entry(n, member))
-
-/**
- * list_for_each_entry_safe_reverse - iterate backwards over list safe against removal
- * @pos:	the type * to use as a loop cursor.
- * @n:		another type * to use as temporary storage
- * @head:	the head for your list.
- * @member:	the name of the list_head within the struct.
- *
- * Iterate backwards over list of given type, safe against removal
- * of list entry.
- */
-#define list_for_each_entry_safe_reverse(pos, n, head, member)  \
-    for (pos = list_last_entry(head, __typeof__(*pos), member),     \
-             n = list_prev_entry(pos, member);			\
-         !list_entry_is_head(pos, head, member);                \
-         pos = n, n = list_prev_entry(n, member))
-
-/**
- * list_safe_reset_next - reset a stale list_for_each_entry_safe loop
- * @pos:	the loop cursor used in the list_for_each_entry_safe loop
- * @n:		temporary storage used in list_for_each_entry_safe
- * @member:	the name of the list_head within the struct.
- *
- * list_safe_reset_next is not safe to use in general if the list may be
- * modified concurrently (eg. the lock is dropped in the loop body). An
- * exception to this is if the cursor element (pos) is pinned in the list,
- * and list_safe_reset_next is called after re-taking the lock and before
- * completing the current iteration of the loop body.
- */
-#define list_safe_reset_next(pos, n, member)    \
-    n = list_next_entry(pos, member)
-
-/*
- * Double linked lists with a single pointer list head.
- * Mostly useful for hash tables where the two pointer list head is
- * too wasteful.
- * You lose the ability to access the tail in O(1).
- */
-
-#define HLIST_HEAD_INIT { .first = NULL }
-#define HLIST_HEAD(name) struct hlist_head name = {  .first = NULL }
-#define INIT_HLIST_HEAD(ptr) ((ptr)->first = NULL)
-static inline void INIT_HLIST_NODE(struct hlist_node *h)
-{
-    h->next = NULL;
-    h->pprev = NULL;
-}
-
-/**
- * hlist_unhashed - Has node been removed from list and reinitialized?
- * @h: Node to be checked
- *
- * Not that not all removal functions will leave a node in unhashed
- * state.  For example, hlist_nulls_del_init_rcu() does leave the
- * node in unhashed state, but hlist_nulls_del() does not.
- */
-static inline int hlist_unhashed(const struct hlist_node *h)
-{
-    return !h->pprev;
-}
-
-/**
- * hlist_unhashed_lockless - Version of hlist_unhashed for lockless use
- * @h: Node to be checked
- *
- * This variant of hlist_unhashed() must be used in lockless contexts
- * to avoid potential load-tearing.  The READ_ONCE() is paired with the
- * various WRITE_ONCE() in hlist helpers that are defined below.
- */
-static inline int hlist_unhashed_lockless(const struct hlist_node *h)
-{
-    return !READ_ONCE(h->pprev);
-}
-
-/**
- * hlist_empty - Is the specified hlist_head structure an empty hlist?
- * @h: Structure to check.
- */
-static inline int hlist_empty(const struct hlist_head *h)
-{
-    return !READ_ONCE(h->first);
-}
-
-static inline void __hlist_del(struct hlist_node *n)
-{
-    struct hlist_node *next = n->next;
-    struct hlist_node **pprev = n->pprev;
-
-    WRITE_ONCE(*pprev, next);
-    if (next)
-        WRITE_ONCE(next->pprev, pprev);
-}
-
-/**
- * hlist_del - Delete the specified hlist_node from its list
- * @n: Node to delete.
- *
- * Note that this function leaves the node in hashed state.  Use
- * hlist_del_init() or similar instead to unhash @n.
- */
-static inline void hlist_del(struct hlist_node *n)
-{
-    __hlist_del(n);
-    n->next = LIST_POISON1;
-    n->pprev = LIST_POISON2;
-}
-
-/**
- * hlist_del_init - Delete the specified hlist_node from its list and initialize
- * @n: Node to delete.
- *
- * Note that this function leaves the node in unhashed state.
- */
-static inline void hlist_del_init(struct hlist_node *n)
-{
-    if (!hlist_unhashed(n)) {
-        __hlist_del(n);
-        INIT_HLIST_NODE(n);
-    }
-}
-
-/**
- * hlist_add_head - add a new entry at the beginning of the hlist
- * @n: new entry to be added
- * @h: hlist head to add it after
- *
- * Insert a new entry after the specified head.
- * This is good for implementing stacks.
- */
-static inline void hlist_add_head(struct hlist_node *n, struct hlist_head *h)
-{
-    struct hlist_node *first = h->first;
-    WRITE_ONCE(n->next, first);
-    if (first)
-        WRITE_ONCE(first->pprev, &n->next);
-    WRITE_ONCE(h->first, n);
-    WRITE_ONCE(n->pprev, &h->first);
-}
-
-/**
- * hlist_add_before - add a new entry before the one specified
- * @n: new entry to be added
- * @next: hlist node to add it before, which must be non-NULL
- */
-static inline void hlist_add_before(struct hlist_node *n,
-				    struct hlist_node *next)
-{
-    WRITE_ONCE(n->pprev, next->pprev);
-    WRITE_ONCE(n->next, next);
-    WRITE_ONCE(next->pprev, &n->next);
-    WRITE_ONCE(*(n->pprev), n);
-}
-
-/**
- * hlist_add_behind - add a new entry after the one specified
- * @n: new entry to be added
- * @prev: hlist node to add it after, which must be non-NULL
- */
-static inline void hlist_add_behind(struct hlist_node *n,
-				    struct hlist_node *prev)
-{
-    WRITE_ONCE(n->next, prev->next);
-    WRITE_ONCE(prev->next, n);
-    WRITE_ONCE(n->pprev, &prev->next);
-
-    if (n->next)
-        WRITE_ONCE(n->next->pprev, &n->next);
-}
-
-/**
- * hlist_add_fake - create a fake hlist consisting of a single headless node
- * @n: Node to make a fake list out of
- *
- * This makes @n appear to be its own predecessor on a headless hlist.
- * The point of this is to allow things like hlist_del() to work correctly
- * in cases where there is no list.
- */
-static inline void hlist_add_fake(struct hlist_node *n)
-{
-    n->pprev = &n->next;
-}
-
-/**
- * hlist_fake: Is this node a fake hlist?
- * @h: Node to check for being a self-referential fake hlist.
- */
-static inline bool hlist_fake(struct hlist_node *h)
-{
-    return h->pprev == &h->next;
-}
-
-/**
- * hlist_is_singular_node - is node the only element of the specified hlist?
- * @n: Node to check for singularity.
- * @h: Header for potentially singular list.
- *
- * Check whether the node is the only node of the head without
- * accessing head, thus avoiding unnecessary cache misses.
- */
-static inline bool
-hlist_is_singular_node(struct hlist_node *n, struct hlist_head *h)
-{
-    return !n->next && n->pprev == &h->first;
-}
-
-/**
- * hlist_move_list - Move an hlist
- * @old: hlist_head for old list.
- * @new: hlist_head for new list.
- *
- * Move a list from one list head to another. Fixup the pprev
- * reference of the first entry if it exists.
- */
-static inline void hlist_move_list(struct hlist_head *old,
-				   struct hlist_head *new)
-{
-    new->first = old->first;
-    if (new->first)
-        new->first->pprev = &new->first;
-    old->first = NULL;
-}
-
-#define hlist_entry(ptr, type, member) container_of(ptr,type,member)
-
-#define hlist_for_each(pos, head)                       \
-    for (pos = (head)->first; pos ; pos = pos->next)
-
-#define hlist_for_each_safe(pos, n, head)                       \
-    for (pos = (head)->first; pos && ({ n = pos->next; 1; });   \
-         pos = n)
-
-#define hlist_entry_safe(ptr, type, member)                     \
-    ({ __typeof__(ptr) ____ptr = (ptr);                             \
-        ____ptr ? hlist_entry(____ptr, type, member) : NULL;    \
-    })
-
-/**
- * hlist_for_each_entry	- iterate over list of given type
- * @pos:	the type * to use as a loop cursor.
- * @head:	the head for your list.
- * @member:	the name of the hlist_node within the struct.
- */
-#define hlist_for_each_entry(pos, head, member)				\
-    for (pos = hlist_entry_safe((head)->first, __typeof__(*(pos)), member); \
-         pos;                                                           \
-         pos = hlist_entry_safe((pos)->member.next, __typeof__(*(pos)), member))
-
-/**
- * hlist_for_each_entry_continue - iterate over a hlist continuing after current point
- * @pos:	the type * to use as a loop cursor.
- * @member:	the name of the hlist_node within the struct.
- */
-#define hlist_for_each_entry_continue(pos, member)			\
-    for (pos = hlist_entry_safe((pos)->member.next, __typeof__(*(pos)), member); \
-         pos;                                                           \
-         pos = hlist_entry_safe((pos)->member.next, __typeof__(*(pos)), member))
-
-/**
- * hlist_for_each_entry_from - iterate over a hlist continuing from current point
- * @pos:	the type * to use as a loop cursor.
- * @member:	the name of the hlist_node within the struct.
- */
-#define hlist_for_each_entry_from(pos, member)				\
-    for (; pos;                                                         \
-         pos = hlist_entry_safe((pos)->member.next, __typeof__(*(pos)), member))
-
-/**
- * hlist_for_each_entry_safe - iterate over list of given type safe against removal of list entry
- * @pos:	the type * to use as a loop cursor.
- * @n:		a &struct hlist_node to use as temporary storage
- * @head:	the head for your list.
- * @member:	the name of the hlist_node within the struct.
- */
-#define hlist_for_each_entry_safe(pos, n, head, member) 		\
-    for (pos = hlist_entry_safe((head)->first, __typeof__(*pos), member);   \
-         pos && ({ n = pos->member.next; 1; });                         \
-         pos = hlist_entry_safe(n, __typeof__(*pos), member))
-
-#endif  /* __BR_LIST_H */

include/list_sort.h

@@ -1,20 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-
-/*
- * Taken from linux kernel: lib/list_sort.c
- */
-
-#ifndef _BR_LIST_SORT_H
-#define _BR_LIST_SORT_H
-
-//#include <linux/types.h>
-
-struct list_head;
-
-typedef int __attribute__((nonnull(2,3))) (*list_cmp_func_t)(void *,
-		const struct list_head *, const struct list_head *);
-
-__attribute__((nonnull(2,3)))
-void list_sort(void *priv, struct list_head *head, list_cmp_func_t cmp);
-
-#endif  /* _BR_LIST_SORT */

include/packed_struct.h

@@ -1,46 +0,0 @@
-#ifndef _LINUX_UNALIGNED_PACKED_STRUCT_H
-#define _LINUX_UNALIGNED_PACKED_STRUCT_H
-
-#include <linux/types.h>
-
-struct __una_u16 { u16 x; } __packed;
-struct __una_u32 { u32 x; } __packed;
-struct __una_u64 { u64 x; } __packed;
-
-static inline u16 __get_unaligned_cpu16(const void *p)
-{
-	const struct __una_u16 *ptr = (const struct __una_u16 *)p;
-	return ptr->x;
-}
-
-static inline u32 __get_unaligned_cpu32(const void *p)
-{
-	const struct __una_u32 *ptr = (const struct __una_u32 *)p;
-	return ptr->x;
-}
-
-static inline u64 __get_unaligned_cpu64(const void *p)
-{
-	const struct __una_u64 *ptr = (const struct __una_u64 *)p;
-	return ptr->x;
-}
-
-static inline void __put_unaligned_cpu16(u16 val, void *p)
-{
-	struct __una_u16 *ptr = (struct __una_u16 *)p;
-	ptr->x = val;
-}
-
-static inline void __put_unaligned_cpu32(u32 val, void *p)
-{
-	struct __una_u32 *ptr = (struct __una_u32 *)p;
-	ptr->x = val;
-}
-
-static inline void __put_unaligned_cpu64(u64 val, void *p)
-{
-	struct __una_u64 *ptr = (struct __una_u64 *)p;
-	ptr->x = val;
-}
-
-#endif /* _LINUX_UNALIGNED_PACKED_STRUCT_H */

include/pjwhash-inline.h

@@ -1,53 +0,0 @@
-/* pjwhash-inline.h - PJW hash function, inline version.
- *
- * Copyright (C) 2021-2022 Bruno Raoult ("br")
- * Licensed under the GNU General Public License v3.0 or later.
- * Some rights reserved. See COPYING.
- *
- * You should have received a copy of the GNU General Public License along with this
- * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
- *
- * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
- *
- */
-
-#ifndef _PJWHASH_INLINE_H
-#define _PJWHASH_INLINE_H
-
-#include "bits.h"
-
-#define THREE_QUARTERS ((int) ((BITS_PER_INT * 3) / 4))
-#define ONE_EIGHTH     ((int) (BITS_PER_INT / 8))
-#define HIGH_BITS      ( ~((uint)(~0) >> ONE_EIGHTH ))
-
-#ifndef _pjw_inline
-#define _pjw_inline static inline
-#endif
-
-/**
- * unsigned int pjwhash - PJW hash function
- * @key:    the key address.
- * @length: the length of key.
- *
- * This hash was created by Peter Jay Weinberger (AT&T Bell Labs):
- * https://en.wikipedia.org/wiki/PJW_hash_function
- *
- * Return: the PJW hash.
- */
-_pjw_inline uint pjwhash(const void* key, uint length)
-{
-   uint hash = 0, high;
-   const u8 *k = key;
-
-   for (uint i = 0; i < length; ++k, ++i) {
-       hash = (hash << ONE_EIGHTH) + *k;
-      high = hash & HIGH_BITS;
-      if (high != 0) {
-          hash ^= high >> THREE_QUARTERS;
-          hash &= ~high;
-      }
-   }
-   return hash;
-}
-
-#endif  /* _PJWHASH_INLINE_H */

include/pjwhash.h

@@ -1,30 +0,0 @@
-/* pjwhash.h - PJW hash function, extern version.
- *
- * Copyright (C) 2021-2022 Bruno Raoult ("br")
- * Licensed under the GNU General Public License v3.0 or later.
- * Some rights reserved. See COPYING.
- *
- * You should have received a copy of the GNU General Public License along with this
- * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
- *
- * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
- */
-
-#ifndef _PJWHASH_H
-#define _PJWHASH_H
-
-#include "bits.h"
-
-/**
- * unsigned int pjwhash - PJW hash function
- * @key:    the key address.
- * @length: the length of key.
- *
- * This hash was created by Peter Jay Weinberger (AT&T Bell Labs):
- * https://en.wikipedia.org/wiki/PJW_hash_function
- *
- * Return: the PJW hash.
- */
-extern uint  pjwhash (const void* key, uint length);
-
-#endif  /* _PJWHASH_H */

include/plist.h

@@ -1,345 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-
-/* adaptation of kernel's <linux/plist.h>
- *
- */
-
-/*
- * Descending-priority-sorted double-linked list
- *
- * (C) 2002-2003 Intel Corp
- * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>.
- *
- * 2001-2005 (c) MontaVista Software, Inc.
- * Daniel Walker <dwalker@mvista.com>
- *
- * (C) 2005 Thomas Gleixner <tglx@linutronix.de>
- *
- * Simplifications of the original code by
- * Oleg Nesterov <oleg@tv-sign.ru>
- *
- * Based on simple lists (include/linux/list.h).
- *
- * This is a priority-sorted list of nodes; each node has a
- * priority from INT_MIN (highest) to INT_MAX (lowest).
- *
- * Addition is O(K), removal is O(1), change of priority of a node is
- * O(K) and K is the number of RT priority levels used in the system.
- * (1 <= K <= 99)
- *
- * This list is really a list of lists:
- *
- *  - The tier 1 list is the prio_list, different priority nodes.
- *
- *  - The tier 2 list is the node_list, serialized nodes.
- *
- * Simple ASCII art explanation:
- *
- * pl:prio_list (only for plist_node)
- * nl:node_list
- *   HEAD|             NODE(S)
- *       |
- *       ||------------------------------------|
- *       ||->|pl|<->|pl|<--------------->|pl|<-|
- *       |   |10|   |21|   |21|   |21|   |40|   (prio)
- *       |   |  |   |  |   |  |   |  |   |  |
- *       |   |  |   |  |   |  |   |  |   |  |
- * |->|nl|<->|nl|<->|nl|<->|nl|<->|nl|<->|nl|<-|
- * |-------------------------------------------|
- *
- * The nodes on the prio_list list are sorted by priority to simplify
- * the insertion of new nodes. There are no nodes with duplicate
- * priorites on the list.
- *
- * The nodes on the node_list are ordered by priority and can contain
- * entries which have the same priority. Those entries are ordered
- * FIFO
- *
- * Addition means: look for the prio_list node in the prio_list
- * for the priority of the node and insert it before the node_list
- * entry of the next prio_list node. If it is the first node of
- * that priority, add it to the prio_list in the right position and
- * insert it into the serialized node_list list
- *
- * Removal means remove it from the node_list and remove it from
- * the prio_list if the node_list list_head is non empty. In case
- * of removal from the prio_list it must be checked whether other
- * entries of the same priority are on the list or not. If there
- * is another entry of the same priority then this entry has to
- * replace the removed entry on the prio_list. If the entry which
- * is removed is the only entry of this priority then a simple
- * remove from both list is sufficient.
- *
- * INT_MIN is the highest priority, 0 is the medium highest, INT_MAX
- * is lowest priority.
- *
- * No locking is done, up to the caller.
- */
-#ifndef _LINUX_PLIST_H_
-#define _LINUX_PLIST_H_
-
-#include "container-of.h"
-#include "list.h"
-//#include <types.h>
-
-// #include <asm/bug.h>
-
-struct plist_head {
-    struct list_head node_list;
-};
-
-struct plist_node {
-    int			prio;
-    struct list_head	prio_list;
-    struct list_head	node_list;
-};
-
-/**
- * PLIST_HEAD_INIT - static struct plist_head initializer
- * @head:	struct plist_head variable name
- */
-#define PLIST_HEAD_INIT(head)				\
-    {							\
-	.node_list = LIST_HEAD_INIT((head).node_list)	\
-            }
-
-/**
- * PLIST_HEAD - declare and init plist_head
- * @head:	name for struct plist_head variable
- */
-#define PLIST_HEAD(head)                                \
-    struct plist_head head = PLIST_HEAD_INIT(head)
-
-/**
- * PLIST_NODE_INIT - static struct plist_node initializer
- * @node:	struct plist_node variable name
- * @__prio:	initial node priority
- */
-#define PLIST_NODE_INIT(node, __prio)                           \
-    {                                                           \
-	.prio  = (__prio),                                      \
-            .prio_list = LIST_HEAD_INIT((node).prio_list),	\
-            .node_list = LIST_HEAD_INIT((node).node_list),	\
-            }
-
-/**
- * plist_head_init - dynamic struct plist_head initializer
- * @head:	&struct plist_head pointer
- */
-static inline void
-plist_head_init(struct plist_head *head)
-{
-    INIT_LIST_HEAD(&head->node_list);
-}
-
-/**
- * plist_node_init - Dynamic struct plist_node initializer
- * @node:	&struct plist_node pointer
- * @prio:	initial node priority
- */
-static inline void plist_node_init(struct plist_node *node, int prio)
-{
-    node->prio = prio;
-    INIT_LIST_HEAD(&node->prio_list);
-    INIT_LIST_HEAD(&node->node_list);
-}
-
-extern void plist_add(struct plist_node *node, struct plist_head *head);
-extern void plist_del(struct plist_node *node, struct plist_head *head);
-
-extern void plist_requeue(struct plist_node *node, struct plist_head *head);
-
-/**
- * plist_for_each - iterate over the plist
- * @pos:	the type * to use as a loop counter
- * @head:	the head for your list
- */
-#define plist_for_each(pos, head)                               \
-    list_for_each_entry(pos, &(head)->node_list, node_list)
-
-/**
- * plist_for_each_reverse - iterate backwards over the plist
- * @pos:	the type * to use as a loop counter
- * @head:	the head for your list
- */
-#define plist_for_each_reverse(pos, head)                       \
-    list_for_each_entry_reverse(pos, &(head)->node_list, node_list)
-
-/**
- * plist_for_each_continue - continue iteration over the plist
- * @pos:	the type * to use as a loop cursor
- * @head:	the head for your list
- *
- * Continue to iterate over plist, continuing after the current position.
- */
-#define plist_for_each_continue(pos, head)                      \
-    list_for_each_entry_continue(pos, &(head)->node_list, node_list)
-
-/**
- * plist_for_each_continue_reverse - continue iteration over the plist
- * @pos:	the type * to use as a loop cursor
- * @head:	the head for your list
- *
- * Continue to iterate backwards over plist, continuing after the current
- * position.
- */
-#define plist_for_each_continue_reverse(pos, head)              \
-    list_for_each_entry_continue_reverse(pos, &(head)->node_list, node_list)
-
-/**
- * plist_for_each_safe - iterate safely over a plist of given type
- * @pos:	the type * to use as a loop counter
- * @n:	another type * to use as temporary storage
- * @head:	the head for your list
- *
- * Iterate over a plist of given type, safe against removal of list entry.
- */
-#define plist_for_each_safe(pos, n, head)                       \
-    list_for_each_entry_safe(pos, n, &(head)->node_list, node_list)
-
-/**
- * plist_for_each_safe_reverse - iterate backwards safely over a plist of given type
- * @pos:	the type * to use as a loop counter
- * @n:	another type * to use as temporary storage
- * @head:	the head for your list
- *
- * Iterate backwards over a plist of given type, safe against removal of list entry.
- */
-#define plist_for_each_safe_reverse(pos, n, head)               \
-    list_for_each_entry_safe_reverse(pos, n, &(head)->node_list, node_list)
-
-/**
- * plist_for_each_entry	- iterate over list of given type
- * @pos:	the type * to use as a loop counter
- * @head:	the head for your list
- * @mem:	the name of the list_head within the struct
- */
-#define plist_for_each_entry(pos, head, mem)                    \
-    list_for_each_entry(pos, &(head)->node_list, mem.node_list)
-
-/**
- * plist_for_each_entry_reverse	- iterate backwards over list of given type
- * @pos:	the type * to use as a loop counter
- * @head:	the head for your list
- * @mem:	the name of the list_head within the struct
- */
-#define plist_for_each_entry_reverse(pos, head, mem)                    \
-    list_for_each_entry_reverse(pos, &(head)->node_list, mem.node_list)
-
-/**
- * plist_for_each_entry_continue - continue iteration over list of given type
- * @pos:	the type * to use as a loop cursor
- * @head:	the head for your list
- * @m:		the name of the list_head within the struct
- *
- * Continue to iterate over list of given type, continuing after
- * the current position.
- */
-#define plist_for_each_entry_continue(pos, head, m)                     \
-    list_for_each_entry_continue(pos, &(head)->node_list, m.node_list)
-
-/**
- * plist_for_each_entry_safe - iterate safely over list of given type
- * @pos:	the type * to use as a loop counter
- * @n:		another type * to use as temporary storage
- * @head:	the head for your list
- * @m:		the name of the list_head within the struct
- *
- * Iterate over list of given type, safe against removal of list entry.
- */
-#define plist_for_each_entry_safe(pos, n, head, m)                      \
-    list_for_each_entry_safe(pos, n, &(head)->node_list, m.node_list)
-
-/**
- * plist_head_empty - return !0 if a plist_head is empty
- * @head:	&struct plist_head pointer
- */
-static inline int plist_head_empty(const struct plist_head *head)
-{
-    return list_empty(&head->node_list);
-}
-
-/**
- * plist_node_empty - return !0 if plist_node is not on a list
- * @node:	&struct plist_node pointer
- */
-static inline int plist_node_empty(const struct plist_node *node)
-{
-    return list_empty(&node->node_list);
-}
-
-/* All functions below assume the plist_head is not empty. */
-
-/**
- * plist_first_entry - get the struct for the first entry
- * @head:	the &struct plist_head pointer
- * @type:	the type of the struct this is embedded in
- * @member:	the name of the list_head within the struct
- */
-#ifdef CONFIG_DEBUG_PLIST
-# define plist_first_entry(head, type, member)          \
-    ({                                                  \
-	WARN_ON(plist_head_empty(head));                \
-	container_of(plist_first(head), type, member);  \
-    })
-#else
-# define plist_first_entry(head, type, member)          \
-    container_of(plist_first(head), type, member)
-#endif
-
-/**
- * plist_last_entry - get the struct for the last entry
- * @head:	the &struct plist_head pointer
- * @type:	the type of the struct this is embedded in
- * @member:	the name of the list_head within the struct
- */
-#ifdef CONFIG_DEBUG_PLIST
-# define plist_last_entry(head, type, member)           \
-    ({                                                  \
-	WARN_ON(plist_head_empty(head));                \
-	container_of(plist_last(head), type, member);   \
-    })
-#else
-# define plist_last_entry(head, type, member)           \
-    container_of(plist_last(head), type, member)
-#endif
-
-/**
- * plist_next - get the next entry in list
- * @pos:	the type * to cursor
- */
-#define plist_next(pos)                         \
-    list_next_entry(pos, node_list)
-
-/**
- * plist_prev - get the prev entry in list
- * @pos:	the type * to cursor
- */
-#define plist_prev(pos)                         \
-    list_prev_entry(pos, node_list)
-
-/**
- * plist_first - return the first node (and thus, highest priority)
- * @head:	the &struct plist_head pointer
- *
- * Assumes the plist is _not_ empty.
- */
-static inline struct plist_node *plist_first(const struct plist_head *head)
-{
-    return list_entry(head->node_list.next,
-                      struct plist_node, node_list);
-}
-
-/**
- * plist_last - return the last node (and thus, lowest priority)
- * @head:	the &struct plist_head pointer
- *
- * Assumes the plist is _not_ empty.
- */
-static inline struct plist_node *plist_last(const struct plist_head *head)
-{
-    return list_entry(head->node_list.prev,
-                      struct plist_node, node_list);
-}
-
-#endif

include/pool.h

@@ -1,90 +0,0 @@
-/* pool.h - A simple memory pool manager.
- *
- * Copyright (C) 2021-2022 Bruno Raoult ("br")
- * Licensed under the GNU General Public License v3.0 or later.
- * Some rights reserved. See COPYING.
- *
- * You should have received a copy of the GNU General Public License along with this
- * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
- *
- * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
- *
- */
-
-#ifndef POOL_H
-#define POOL_H
-
-#include <stdint.h>
-#include <stddef.h>
-#include "list.h"
-#include "bits.h"
-
-#define POOL_NAME_LENGTH (16)                     /* max name length including trailing \0 */
-
-typedef struct {
-    struct list_head list_blocks;                 /* list of allocated blocks in pool */
-    char data[];                                  /* objects block */
-} block_t;
-
-typedef struct {
-    char name[POOL_NAME_LENGTH];                  /* pool name */
-    size_t eltsize;                               /* object size */
-    u32 available;                                /* current available elements */
-    u32 allocated;                                /* total objects allocated */
-    u32 growsize;                                 /* number of objects per block allocated */
-    u32 nblocks;                                  /* number of blocks allocated */
-    struct list_head list_available;              /* available nodes */
-    struct list_head list_blocks;                 /* allocated blocks */
-} pool_t;
-
-/**
- * pool_stats - display some pool statistics
- * @pool:    the pool address.
- */
-void pool_stats(pool_t *pool);
-
-/**
- * pool_create - create a new memory pool
- * @name:    the name to give to the pool.
- * @grow:    the number of elements to add when no more available.
- * @size:    the size of an element in pool.
- *
- * The name will be truncated to 16 characters (including the final '\0').
- *
- * Return:   The address of the created pool, or NULL if error.
- */
-pool_t *pool_create(const char *name, u32 grow, size_t size);
-
-/**
- * pool_get() - Get an element from a pool.
- * @pool:    The pool address.
- *
- * Get an object from the pool.
- *
- * Return:   The address of the object, or NULL if error.
- */
-void *pool_get(pool_t *pool);
-
-/**
- * pool_add() - Add (free) an element to a pool.
- * @pool:    The pool address.
- * @elt:     The address of the object to add to the pool.
- *
- * The object will be available for further pool_get().
- *
- * Return:   The current number of available elements in pool (including
- *           @elt).
- */
-u32 pool_add(pool_t *pool, void *elt);
-
-/**
- * pool_destroy() - destroy a pool.
- * @pool:    The pool address.
- *
- * Attention: All memory is freed, but no check is done whether all pool
- * elements have been released. Referencing any pool object after this call
- * will likely imply some memory corruption.
- */
-void pool_destroy(pool_t *pool);
-
-#endif

include/rwonce.h

@@ -1,128 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-
-/* adaptation of kernel's <asm-generic/rwonce.h>
- * See https://www.kernel.org/doc/Documentation/memory-barriers.txt
- */
-/*
- * Prevent the compiler from merging or refetching reads or writes. The
- * compiler is also forbidden from reordering successive instances of
- * READ_ONCE and WRITE_ONCE, but only when the compiler is aware of some
- * particular ordering. One way to make the compiler aware of ordering is to
- * put the two invocations of READ_ONCE or WRITE_ONCE in different C
- * statements.
- *
- * These two macros will also work on aggregate data types like structs or
- * unions.
- *
- * Their two major use cases are: (1) Mediating communication between
- * process-level code and irq/NMI handlers, all running on the same CPU,
- * and (2) Ensuring that the compiler does not fold, spindle, or otherwise
- * mutilate accesses that either do not require ordering or that interact
- * with an explicit memory barrier or atomic instruction that provides the
- * required ordering.
- */
-#ifndef __BR_RWONCE_H
-#define __BR_RWONCE_H
-
-/************ originally in <include/linux/compiler_attributes.h> */
-#if __has_attribute(__error__)
-# define __compiletime_error(msg)       __attribute__((__error__(msg)))
-#else
-# define __compiletime_error(msg)
-#endif
-
-/************ originally in <include/linux/compiler_types.h> */
-/*
- * __unqual_scalar_typeof(x) - Declare an unqualified scalar type, leaving
- *                             non-scalar types unchanged.
- */
-/*
- * Prefer C11 _Generic for better compile-times and simpler code. Note: 'char'
- * is not type-compatible with 'signed char', and we define a separate case.
- */
-#define __scalar_type_to_expr_cases(type)                               \
-    unsigned type:  (unsigned type)0,                                   \
-    signed type:    (signed type)0
-
-#define __unqual_scalar_typeof(x)                                       \
-    typeof(_Generic((x),                                                \
-                    char:  (char)0,                                     \
-                    __scalar_type_to_expr_cases(char),                  \
-                    __scalar_type_to_expr_cases(short),                 \
-                    __scalar_type_to_expr_cases(int),                   \
-                    __scalar_type_to_expr_cases(long),                  \
-                    __scalar_type_to_expr_cases(long long),             \
-                    default: (x)))
-
-/* Is this type a native word size -- useful for atomic operations */
-#define __native_word(t) \
-    (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || \
-     sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long))
-
-#ifdef __OPTIMIZE__
-# define __compiletime_assert(condition, msg, prefix, suffix)           \
-    do {                                                                \
-        extern void prefix ## suffix(void) __compiletime_error(msg);    \
-        if (!(condition))                                               \
-            prefix ## suffix();                                         \
-    } while (0)
-#else
-# define __compiletime_assert(condition, msg, prefix, suffix) do { } while (0)
-#endif
-
-#define _compiletime_assert(condition, msg, prefix, suffix) \
-    __compiletime_assert(condition, msg, prefix, suffix)
-
-/**
- * compiletime_assert - break build and emit msg if condition is false
- * @condition: a compile-time constant condition to check
- * @msg:       a message to emit if condition is false
- *
- * In tradition of POSIX assert, this macro will break the build if the
- * supplied condition is *false*, emitting the supplied error message if the
- * compiler has support to do so.
- */
-#define compiletime_assert(condition, msg)                              \
-    _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
-
-#define compiletime_assert_atomic_type(t)                               \
-    compiletime_assert(__native_word(t),                                \
-                       "Need native word sized stores/loads for atomicity.")
-
-/************ originally in <asm-generic/rwonce.h> */
-/*
- * Yes, this permits 64-bit accesses on 32-bit architectures. These will
- * actually be atomic in some cases (namely Armv7 + LPAE), but for others we
- * rely on the access being split into 2x32-bit accesses for a 32-bit quantity
- * (e.g. a virtual address) and a strong prevailing wind.
- */
-#define compiletime_assert_rwonce_type(t)                                  \
-    compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
-                       "Unsupported access size for {READ,WRITE}_ONCE().")
-
-/*
- * Use __READ_ONCE() instead of READ_ONCE() if you do not require any
- * atomicity. Note that this may result in tears!
- */
-#ifndef __READ_ONCE
-#define __READ_ONCE(x)  (*(const volatile __unqual_scalar_typeof(x) *)&(x))
-#endif
-
-#define READ_ONCE(x)                                                    \
-({                                                                      \
-    compiletime_assert_rwonce_type(x);                                  \
-    __READ_ONCE(x);                                                     \
-})
-
-#define __WRITE_ONCE(x, val)                                            \
-do {                                                                    \
-    *(volatile typeof(x) *)&(x) = (val);                                \
-} while (0)
-
-#define WRITE_ONCE(x, val)                                              \
-do {                                                                    \
-    compiletime_assert_rwonce_type(x);                                  \
-    __WRITE_ONCE(x, val);                                               \
-} while (0)
-
-#endif  /* __BR_RWONCE_H */

include/struct-group.h

@@ -1,105 +0,0 @@
-/* struct-group.h - mirrored structure macros.
- *
- * Copyright (C) 2021-2022 Bruno Raoult ("br")
- * Licensed under the GNU General Public License v3.0 or later.
- * Some rights reserved. See COPYING.
- *
- * You should have received a copy of the GNU General Public License along with this
- * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
- *
- * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
- *
- * Some parts are taken from Linux's kernel <linux/stddef.h> and others, and are :
- * SPDX-License-Identifier: GPL-2.0
- *
- */
-
-#ifndef _STRUCT_GROUP_H
-#define _STRUCT_GROUP_H
-
-/**
- * __struct_group() - Create a mirrored named and anonyomous struct
- *
- * @TAG: The tag name for the named sub-struct (usually empty)
- * @NAME: The identifier name of the mirrored sub-struct
- * @ATTRS: Any struct attributes (usually empty)
- * @MEMBERS: The member declarations for the mirrored structs
- *
- * Used to create an anonymous union of two structs with identical layout
- * and size: one anonymous and one named. The former's members can be used
- * normally without sub-struct naming, and the latter can be used to
- * reason about the start, end, and size of the group of struct members.
- * The named struct can also be explicitly tagged for layer reuse, as well
- * as both having struct attributes appended.
- */
-#define __struct_group(TAG, NAME, ATTRS, MEMBERS...) \
-	union { \
-		struct { MEMBERS } ATTRS; \
-		struct TAG { MEMBERS } ATTRS NAME; \
-	}
-
-/**
- * DECLARE_FLEX_ARRAY() - Declare a flexible array usable in a union
- *
- * @TYPE: The type of each flexible array element
- * @NAME: The name of the flexible array member
- *
- * In order to have a flexible array member in a union or alone in a
- * struct, it needs to be wrapped in an anonymous struct with at least 1
- * named member, but that member can be empty.
- */
-#define DECLARE_FLEX_ARRAY(TYPE, NAME)	\
-	struct { \
-		struct { } __empty_ ## NAME; \
-		TYPE NAME[]; \
-	}
-
-/**
- * struct_group() - Wrap a set of declarations in a mirrored struct
- *
- * @NAME: The identifier name of the mirrored sub-struct
- * @MEMBERS: The member declarations for the mirrored structs
- *
- * Used to create an anonymous union of two structs with identical
- * layout and size: one anonymous and one named. The former can be
- * used normally without sub-struct naming, and the latter can be
- * used to reason about the start, end, and size of the group of
- * struct members.
- */
-#define struct_group(NAME, MEMBERS...)	\
-	__struct_group(/* no tag */, NAME, /* no attrs */, MEMBERS)
-
-/**
- * struct_group_attr() - Create a struct_group() with trailing attributes
- *
- * @NAME: The identifier name of the mirrored sub-struct
- * @ATTRS: Any struct attributes to apply
- * @MEMBERS: The member declarations for the mirrored structs
- *
- * Used to create an anonymous union of two structs with identical
- * layout and size: one anonymous and one named. The former can be
- * used normally without sub-struct naming, and the latter can be
- * used to reason about the start, end, and size of the group of
- * struct members. Includes structure attributes argument.
- */
-#define struct_group_attr(NAME, ATTRS, MEMBERS...) \
-	__struct_group(/* no tag */, NAME, ATTRS, MEMBERS)
-
-/**
- * struct_group_tagged() - Create a struct_group with a reusable tag
- *
- * @TAG: The tag name for the named sub-struct
- * @NAME: The identifier name of the mirrored sub-struct
- * @MEMBERS: The member declarations for the mirrored structs
- *
- * Used to create an anonymous union of two structs with identical
- * layout and size: one anonymous and one named. The former can be
- * used normally without sub-struct naming, and the latter can be
- * used to reason about the start, end, and size of the group of
- * struct members. Includes struct tag argument for the named copy,
- * so the specified layout can be reused later.
- */
-#define struct_group_tagged(TAG, NAME, MEMBERS...) \
-	__struct_group(TAG, NAME, /* no attrs */, MEMBERS)
-
-#endif  /* _STRUCT_GROUP_H */

libsrc/bits.c

@@ -1,91 +0,0 @@
-/* bits.c - information about bitops implementation.
- *
- * Copyright (C) 2021-2022 Bruno Raoult ("br")
- * Licensed under the GNU General Public License v3.0 or later.
- * Some rights reserved. See COPYING.
- *
- * You should have received a copy of the GNU General Public License along with this
- * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
- *
- * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
- *
- */
-
-#include "bits.h"
-#include "debug.h"
-
-/**
- * bits_implementation - display bitops implementation.
- *
- * For basic bitops (popcount, ctz, etc...), print the implementation
- * (builtin, emulated).
- */
-void bits_implementation(void)
-{
-    log(0, "bitops implementation: ");
-
-    log(0, "popcount64: ");
-#   if __has_builtin(__builtin_popcountl)
-    log(0, "builtin, ");
-#   else
-    log(0, "emulated, ");
-#   endif
-
-    log(0, "popcount32: ");
-#   if __has_builtin(__builtin_popcount)
-    log(0, "builtin, ");
-#   else
-    log(0, "emulated, ");
-#   endif
-
-    log(0, "ctz64: ");
-#   if __has_builtin(__builtin_ctzl)
-    log(0, "builtin, ");
-#   elif __has_builtin(__builtin_clzl)
-    log(0, "builtin (clzl), ");
-#   else
-    log(0, "emulated, ");
-#   endif
-
-    log(0, "ctz32: ");
-#   if __has_builtin(__builtin_ctz)
-    log(0, "builtin, ");
-#   elif __has_builtin(__builtin_clz)
-    log(0, "builtin (clz), ");
-#   else
-    log(0, "emulated, ");
-#   endif
-
-    log(0, "clz64: ");
-#   if __has_builtin(__builtin_clzl)
-    log(0, "builtin, ");
-#   else
-    log(0, "emulated, ");
-#   endif
-
-    log(0, "clz32: ");
-#   if __has_builtin(__builtin_clz)
-    log(0, "builtin, ");
-#   else
-    log(0, "emulated, ");
-#   endif
-
-    log(0, "ffs64: ");
-#   if __has_builtin(__builtin_ffsl)
-    log(0, "builtin, ");
-#   elif __has_builtin(__builtin_ctzl)
-    log(0, "builtin (ctzl), ");
-#   else
-    log(0, "emulated, ");
-#   endif
-
-    log(0, "ffs32: ");
-#   if __has_builtin(__builtin_ffs)
-    log(0, "builtin, ");
-#   elif __has_builtin(__builtin_ctz)
-    log(0, "builtin (ctzl), ");
-#   else
-    log(0, "emulated, ");
-#   endif
-    log(0, "\n");
-}

libsrc/debug.c

@@ -1,145 +0,0 @@
-/* debug.c - debug/log management
- *
- * Copyright (C) 2021-2022 Bruno Raoult ("br")
- * Licensed under the GNU General Public License v3.0 or later.
- * Some rights reserved. See COPYING.
- *
- * You should have received a copy of the GNU General Public License along with this
- * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
- *
- * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
- *
- */
-
-#include <stdio.h>
-#include <stdarg.h>
-#include <time.h>
-
-#ifndef DEBUG_DEBUG
-#define DEBUG_DEBUG
-#endif
-
-#include "debug.h"
-
-static long long timer_start;                     /* in nanosecond */
-static int level = 0;                             /* output log when < level */
-static int flush = false;                         /* force flush after logs */
-static FILE *stream = NULL;                       /* stream to use */
-
-/**
- * debug_level_set() - set debug level.
- * @_level: debug level (integer).
- */
-void debug_level_set(int _level)
-{
-    level = _level;
-#   ifdef DEBUG_DEBUG_C
-    log(0, "debug level set to %u\n", level);
-#   endif
-}
-
-/**
- * debug_level_get() - get debug level.
- * @return: current level debug (integer).
- */
-int debug_level_get(void)
-{
-    return level;
-}
-
-void debug_stream_set(FILE *_stream)
-{
-    stream = _stream;
-#   ifdef DEBUG_DEBUG_C
-    log(0, "stream set to %d\n", stream? fileno(stream): -1);
-#   endif
-}
-
-void debug_flush_set(bool _flush)
-{
-    flush = _flush;
-#   ifdef DEBUG_DEBUG_C
-    log(0, "debug flush %s.\n", flush? "set": "unset");
-#   endif
-}
-
-void debug_init(int _level, FILE *_stream, bool _flush)
-{
-    struct timespec timer;
-
-    debug_stream_set(_stream);
-    debug_level_set(_level);
-    debug_flush_set(_flush);
-    if (!clock_gettime(CLOCK_MONOTONIC, &timer)) {
-        timer_start = timer.tv_sec * NANOSEC + timer.tv_nsec;
-    }
-    else {
-        timer_start = 0;
-    }
-    log(0, "timer started.\n");
-}
-
-long long debug_timer_elapsed(void)
-{
-    struct timespec timer;
-
-    clock_gettime(CLOCK_MONOTONIC, &timer);
-    return (timer.tv_sec * NANOSEC + timer.tv_nsec) - timer_start;
-}
-
-/**
- * debug() - log function
- * @lev: log level
- * @timestamp: boolean, print timestamp if true
- * @indent: indent level (2 spaces each)
- * @src: source file/func name (or NULL)
- * @line: line number
- */
-void debug(int lev, bool timestamp, int indent, const char *src,
-           int line, const char *fmt, ...)
-{
-    if (!stream || lev > level)
-        return;
-
-    va_list ap;
-
-    if (indent)
-        fprintf(stream, "%*s", 2*(indent-1), "");
-
-    if (timestamp) {
-        long long diff = debug_timer_elapsed();
-        fprintf(stream, "%lld.%03lld ", diff/NANOSEC, (diff/1000000)%1000);
-        fprintf(stream, "%010lld ", diff);
-    }
-
-    if (src) {
-        if (line)
-            fprintf(stream, "[%s:%u] ", src, line);
-        else
-            fprintf(stream, "[%s] ", src);
-    }
-    va_start(ap, fmt);
-    vfprintf(stream, fmt, ap);
-    va_end(ap);
-    if (flush)
-        fflush(stream);
-}
-
-#ifdef BIN_debug
-#include <unistd.h>
-
-int main()
-{
-    int foo=1;
-    debug_init(5);
-
-    log(0, "log0=%d\n", foo++);
-    log(1, "log1=%d\n", foo++);
-    log(2, "log2=%d\n", foo++);
-    log_i(2, "log_i 2=%d\n", foo++);
-    log_i(5, "log_i 5=%d\n", foo++);
-    log_i(6, "log_i 6=%d\n", foo++);
-    log_it(4, "log_it 4=%d\n", foo++);
-    log_f(1, "log_f 5=%d\n", foo++);
-}
-#endif

libsrc/hash.c

@@ -1,29 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-
-/*  inspired from kernel's <fs/namei.h>
- */
-#include "hash.h"
-
-/* Return the hash of a string of known length */
-unsigned int hash_string(const void *salt, const char *name, unsigned int len)
-{
-	unsigned long hash = init_name_hash(salt);
-	while (len--)
-		hash = partial_name_hash((unsigned char)*name++, hash);
-	return end_name_hash(hash);
-}
-
-/* Return the "hash_len" (hash and length) of a null-terminated string */
-u64 hashlen_string(const void *salt, const char *name)
-{
-	unsigned long hash = init_name_hash(salt);
-	unsigned long len = 0, c;
-
-	c = (unsigned char)*name;
-	while (c) {
-		len++;
-		hash = partial_name_hash(c, hash);
-		c = (unsigned char)name[len];
-	}
-	return hashlen_create(end_name_hash(hash), len);
-}

libsrc/list_sort.c

@@ -1,253 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-
-/*
- * Taken from linux kernel: lib/list_sort.c
- */
-#include "list_sort.h"
-#include "list.h"
-#include "bits.h"
-#include "likely.h"
-
-/*
- * Returns a list organized in an intermediate format suited
- * to chaining of merge() calls: null-terminated, no reserved or
- * sentinel head node, "prev" links not maintained.
- */
-__attribute__((nonnull(2,3,4)))
-static struct list_head *merge(void *priv, list_cmp_func_t cmp,
-				struct list_head *a, struct list_head *b)
-{
-	struct list_head *head, **tail = &head;
-
-	for (;;) {
-		/* if equal, take 'a' -- important for sort stability */
-		if (cmp(priv, a, b) <= 0) {
-			*tail = a;
-			tail = &a->next;
-			a = a->next;
-			if (!a) {
-				*tail = b;
-				break;
-			}
-		} else {
-			*tail = b;
-			tail = &b->next;
-			b = b->next;
-			if (!b) {
-				*tail = a;
-				break;
-			}
-		}
-	}
-	return head;
-}
-
-/*
- * Combine final list merge with restoration of standard doubly-linked
- * list structure.  This approach duplicates code from merge(), but
- * runs faster than the tidier alternatives of either a separate final
- * prev-link restoration pass, or maintaining the prev links
- * throughout.
- */
-__attribute__((nonnull(2,3,4,5)))
-static void merge_final(void *priv, list_cmp_func_t cmp, struct list_head *head,
-			struct list_head *a, struct list_head *b)
-{
-	struct list_head *tail = head;
-	u8 count = 0;
-
-	for (;;) {
-		/* if equal, take 'a' -- important for sort stability */
-		if (cmp(priv, a, b) <= 0) {
-			tail->next = a;
-			a->prev = tail;
-			tail = a;
-			a = a->next;
-			if (!a)
-				break;
-		} else {
-			tail->next = b;
-			b->prev = tail;
-			tail = b;
-			b = b->next;
-			if (!b) {
-				b = a;
-				break;
-			}
-		}
-	}
-
-	/* Finish linking remainder of list b on to tail */
-	tail->next = b;
-	do {
-		/*
-		 * If the merge is highly unbalanced (e.g. the input is
-		 * already sorted), this loop may run many iterations.
-		 * Continue callbacks to the client even though no
-		 * element comparison is needed, so the client's cmp()
-		 * routine can invoke cond_resched() periodically.
-		 */
-		if (unlikely(!++count))
-			cmp(priv, b, b);
-		b->prev = tail;
-		tail = b;
-		b = b->next;
-	} while (b);
-
-	/* And the final links to make a circular doubly-linked list */
-	tail->next = head;
-	head->prev = tail;
-}
-
-/**
- * list_sort - sort a list
- * @priv: private data, opaque to list_sort(), passed to @cmp
- * @head: the list to sort
- * @cmp: the elements comparison function
- *
- * The comparison function @cmp must return > 0 if @a should sort after
- * @b ("@a > @b" if you want an ascending sort), and <= 0 if @a should
- * sort before @b *or* their original order should be preserved.  It is
- * always called with the element that came first in the input in @a,
- * and list_sort is a stable sort, so it is not necessary to distinguish
- * the @a < @b and @a == @b cases.
- *
- * This is compatible with two styles of @cmp function:
- * - The traditional style which returns <0 / =0 / >0, or
- * - Returning a boolean 0/1.
- * The latter offers a chance to save a few cycles in the comparison
- * (which is used by e.g. plug_ctx_cmp() in block/blk-mq.c).
- *
- * A good way to write a multi-word comparison is::
- *
- *	if (a->high != b->high)
- *		return a->high > b->high;
- *	if (a->middle != b->middle)
- *		return a->middle > b->middle;
- *	return a->low > b->low;
- *
- *
- * This mergesort is as eager as possible while always performing at least
- * 2:1 balanced merges.  Given two pending sublists of size 2^k, they are
- * merged to a size-2^(k+1) list as soon as we have 2^k following elements.
- *
- * Thus, it will avoid cache thrashing as long as 3*2^k elements can
- * fit into the cache.  Not quite as good as a fully-eager bottom-up
- * mergesort, but it does use 0.2*n fewer comparisons, so is faster in
- * the common case that everything fits into L1.
- *
- *
- * The merging is controlled by "count", the number of elements in the
- * pending lists.  This is beautifully simple code, but rather subtle.
- *
- * Each time we increment "count", we set one bit (bit k) and clear
- * bits k-1 .. 0.  Each time this happens (except the very first time
- * for each bit, when count increments to 2^k), we merge two lists of
- * size 2^k into one list of size 2^(k+1).
- *
- * This merge happens exactly when the count reaches an odd multiple of
- * 2^k, which is when we have 2^k elements pending in smaller lists,
- * so it's safe to merge away two lists of size 2^k.
- *
- * After this happens twice, we have created two lists of size 2^(k+1),
- * which will be merged into a list of size 2^(k+2) before we create
- * a third list of size 2^(k+1), so there are never more than two pending.
- *
- * The number of pending lists of size 2^k is determined by the
- * state of bit k of "count" plus two extra pieces of information:
- *
- * - The state of bit k-1 (when k == 0, consider bit -1 always set), and
- * - Whether the higher-order bits are zero or non-zero (i.e.
- *   is count >= 2^(k+1)).
- *
- * There are six states we distinguish.  "x" represents some arbitrary
- * bits, and "y" represents some arbitrary non-zero bits:
- * 0:  00x: 0 pending of size 2^k;           x pending of sizes < 2^k
- * 1:  01x: 0 pending of size 2^k; 2^(k-1) + x pending of sizes < 2^k
- * 2: x10x: 0 pending of size 2^k; 2^k     + x pending of sizes < 2^k
- * 3: x11x: 1 pending of size 2^k; 2^(k-1) + x pending of sizes < 2^k
- * 4: y00x: 1 pending of size 2^k; 2^k     + x pending of sizes < 2^k
- * 5: y01x: 2 pending of size 2^k; 2^(k-1) + x pending of sizes < 2^k
- * (merge and loop back to state 2)
- *
- * We gain lists of size 2^k in the 2->3 and 4->5 transitions (because
- * bit k-1 is set while the more significant bits are non-zero) and
- * merge them away in the 5->2 transition.  Note in particular that just
- * before the 5->2 transition, all lower-order bits are 11 (state 3),
- * so there is one list of each smaller size.
- *
- * When we reach the end of the input, we merge all the pending
- * lists, from smallest to largest.  If you work through cases 2 to
- * 5 above, you can see that the number of elements we merge with a list
- * of size 2^k varies from 2^(k-1) (cases 3 and 5 when x == 0) to
- * 2^(k+1) - 1 (second merge of case 5 when x == 2^(k-1) - 1).
- */
-__attribute__((nonnull(2,3)))
-void list_sort(void *priv, struct list_head *head, list_cmp_func_t cmp)
-{
-	struct list_head *list = head->next, *pending = NULL;
-	size_t count = 0;	/* Count of pending */
-
-	if (list == head->prev)	/* Zero or one elements */
-		return;
-
-	/* Convert to a null-terminated singly-linked list. */
-	head->prev->next = NULL;
-
-	/*
-	 * Data structure invariants:
-	 * - All lists are singly linked and null-terminated; prev
-	 *   pointers are not maintained.
-	 * - pending is a prev-linked "list of lists" of sorted
-	 *   sublists awaiting further merging.
-	 * - Each of the sorted sublists is power-of-two in size.
-	 * - Sublists are sorted by size and age, smallest & newest at front.
-	 * - There are zero to two sublists of each size.
-	 * - A pair of pending sublists are merged as soon as the number
-	 *   of following pending elements equals their size (i.e.
-	 *   each time count reaches an odd multiple of that size).
-	 *   That ensures each later final merge will be at worst 2:1.
-	 * - Each round consists of:
-	 *   - Merging the two sublists selected by the highest bit
-	 *     which flips when count is incremented, and
-	 *   - Adding an element from the input as a size-1 sublist.
-	 */
-	do {
-		size_t bits;
-		struct list_head **tail = &pending;
-
-		/* Find the least-significant clear bit in count */
-		for (bits = count; bits & 1; bits >>= 1)
-			tail = &(*tail)->prev;
-		/* Do the indicated merge */
-		if (likely(bits)) {
-			struct list_head *a = *tail, *b = a->prev;
-
-			a = merge(priv, cmp, b, a);
-			/* Install the merged result in place of the inputs */
-			a->prev = b->prev;
-			*tail = a;
-		}
-
-		/* Move one element from input list to pending */
-		list->prev = pending;
-		pending = list;
-		list = list->next;
-		pending->next = NULL;
-		count++;
-	} while (list);
-
-	/* End of input; merge together all the pending lists. */
-	list = pending;
-	pending = pending->prev;
-	for (;;) {
-		struct list_head *next = pending->prev;
-
-		if (!next)
-			break;
-		list = merge(priv, cmp, pending, list);
-		pending = next;
-	}
-	/* The final merge, rebuilding prev links */
-	merge_final(priv, cmp, head, pending, list);
-}

libsrc/plist.c

@@ -1,173 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * adapted from Linux kernel lib/plist.c
- *
- * Descending-priority-sorted double-linked list
- *
- * (C) 2002-2003 Intel Corp
- * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>.
- *
- * 2001-2005 (c) MontaVista Software, Inc.
- * Daniel Walker <dwalker@mvista.com>
- *
- * (C) 2005 Thomas Gleixner <tglx@linutronix.de>
- *
- * Simplifications of the original code by
- * Oleg Nesterov <oleg@tv-sign.ru>
- *
- * Based on simple lists (include/linux/list.h).
- *
- * This file contains the add / del functions which are considered to
- * be too large to inline. See include/linux/plist.h for further
- * information.
- */
-
-#include "plist.h"
-#include "bug.h"
-
-#ifdef DEBUG_PLIST
-
-static struct plist_head test_head;
-
-static void plist_check_prev_next(struct list_head *t, struct list_head *p,
-				  struct list_head *n)
-{
-    WARN(n->prev != p || p->next != n,
-         "top: %p, n: %p, p: %p\n"
-         "prev: %p, n: %p, p: %p\n"
-         "next: %p, n: %p, p: %p\n",
-         t, t->next, t->prev,
-         p, p->next, p->prev,
-         n, n->next, n->prev);
-}
-
-static void plist_check_list(struct list_head *top)
-{
-    struct list_head *prev = top, *next = top->next;
-
-    plist_check_prev_next(top, prev, next);
-    while (next != top) {
-        prev = next;
-        next = prev->next;
-        plist_check_prev_next(top, prev, next);
-    }
-}
-
-static void plist_check_head(struct plist_head *head)
-{
-    if (!plist_head_empty(head))
-        plist_check_list(&plist_first(head)->prio_list);
-    plist_check_list(&head->node_list);
-}
-
-#else
-# define plist_check_head(h)	do { } while (0)
-#endif
-
-/**
- * plist_add - add @node to @head
- *
- * @node:	&struct plist_node pointer
- * @head:	&struct plist_head pointer
- */
-void plist_add(struct plist_node *node, struct plist_head *head)
-{
-    struct plist_node *first, *iter, *prev = NULL;
-    struct list_head *node_next = &head->node_list;
-
-    plist_check_head(head);
-    WARN_ON(!plist_node_empty(node));
-    WARN_ON(!list_empty(&node->prio_list));
-
-    if (plist_head_empty(head))
-        goto ins_node;
-
-    first = iter = plist_first(head);
-
-    do {
-        if (node->prio < iter->prio) {
-            node_next = &iter->node_list;
-            break;
-        }
-
-        prev = iter;
-        iter = list_entry(iter->prio_list.next,
-                          struct plist_node, prio_list);
-    } while (iter != first);
-
-    if (!prev || prev->prio != node->prio)
-        list_add_tail(&node->prio_list, &iter->prio_list);
-ins_node:
-    list_add_tail(&node->node_list, node_next);
-
-    plist_check_head(head);
-}
-
-/**
- * plist_del - Remove a @node from plist.
- *
- * @node:	&struct plist_node pointer - entry to be removed
- * @head:	&struct plist_head pointer - list head
- */
-void plist_del(struct plist_node *node, struct plist_head *head)
-{
-    plist_check_head(head);
-
-    if (!list_empty(&node->prio_list)) {
-        if (node->node_list.next != &head->node_list) {
-            struct plist_node *next;
-
-            next = list_entry(node->node_list.next,
-                              struct plist_node, node_list);
-
-            /* add the next plist_node into prio_list */
-            if (list_empty(&next->prio_list))
-                list_add(&next->prio_list, &node->prio_list);
-        }
-        list_del_init(&node->prio_list);
-    }
-
-    list_del_init(&node->node_list);
-
-    plist_check_head(head);
-}
-
-/**
- * plist_requeue - Requeue @node at end of same-prio entries.
- *
- * This is essentially an optimized plist_del() followed by
- * plist_add().  It moves an entry already in the plist to
- * after any other same-priority entries.
- *
- * @node:	&struct plist_node pointer - entry to be moved
- * @head:	&struct plist_head pointer - list head
- */
-void plist_requeue(struct plist_node *node, struct plist_head *head)
-{
-    struct plist_node *iter;
-    struct list_head *node_next = &head->node_list;
-
-    plist_check_head(head);
-    BUG_ON(plist_head_empty(head));
-    BUG_ON(plist_node_empty(node));
-
-    if (node == plist_last(head))
-        return;
-
-    iter = plist_next(node);
-
-    if (node->prio != iter->prio)
-        return;
-
-    plist_del(node, head);
-
-    plist_for_each_continue(iter, head) {
-        if (node->prio != iter->prio) {
-            node_next = &iter->node_list;
-            break;
-        }
-    }
-    list_add_tail(&node->node_list, node_next);
-
-    plist_check_head(head);
-}

libsrc/pool.c

@@ -1,219 +0,0 @@
-/* pool.c - A simple pool manager.
- *
- * Copyright (C) 2021-2022 Bruno Raoult ("br")
- * Licensed under the GNU General Public License v3.0 or later.
- * Some rights reserved. See COPYING.
- *
- * You should have received a copy of the GNU General Public License along with this
- * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
- *
- * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
- *
- */
-
-#include <stddef.h>
-#include <malloc.h>
-#include <string.h>
-#include <stdlib.h>
-#include <errno.h>
-
-#include "list.h"
-#include "pool.h"
-#include "debug.h"
-#include "bits.h"
-
-void pool_stats(pool_t *pool)
-{
-    if (pool) {
-        block_t *block;
-
-        log_f(1, "[%s] pool [%p]: blocks:%u avail:%u alloc:%u grow:%u eltsize:%zu\n",
-              pool->name, (void *)pool, pool->nblocks, pool->available,
-              pool->allocated, pool->growsize, pool->eltsize);
-        log(5, "\tblocks: ");
-        list_for_each_entry(block, &pool->list_blocks, list_blocks) {
-            log(5, "%p ", block);
-        }
-        log(5, "\n");
-    }
-}
-
-pool_t *pool_create(const char *name, u32 growsize, size_t eltsize)
-{
-    pool_t *pool;
-
-#   ifdef DEBUG_POOL
-    log_f(1, "name=[%s] growsize=%u eltsize=%zu\n", name, growsize, eltsize);
-#   endif
-    /* we need at least  sizeof(struct list_head) space in pool elements
-     */
-    if (eltsize < sizeof (struct list_head)) {
-#       ifdef DEBUG_POOL
-        log_f(1, "[%s]: structure size too small (%zu < %zu), adjusting to %zu.\n",
-              name, eltsize, sizeof(struct list_head), sizeof(struct list_head));
-#       endif
-        eltsize = sizeof(struct list_head);
-    }
-    if ((pool = malloc(sizeof (*pool)))) {
-        strncpy(pool->name, name, POOL_NAME_LENGTH - 1);
-        pool->name[POOL_NAME_LENGTH - 1] = 0;
-        pool->growsize = growsize;
-        pool->eltsize = eltsize;
-        pool->available = 0;
-        pool->allocated = 0;
-        pool->nblocks = 0;
-        INIT_LIST_HEAD(&pool->list_available);
-        INIT_LIST_HEAD(&pool->list_blocks);
-    } else {
-        errno = ENOMEM;
-    }
-    return pool;
-}
-
-static u32 _pool_add(pool_t *pool, struct list_head *elt)
-{
-#   ifdef DEBUG_POOL
-    log_f(6, "pool=%p &head=%p elt=%p off1=%zu off2=%zu\n",
-          (void *)pool, (void *)&pool->list_available, (void *)elt,
-          (void *)&pool->list_available - (void *)pool,
-          offsetof(pool_t, list_available));
-#   endif
-
-    list_add(elt, &pool->list_available);
-    return ++pool->available;
-}
-
-u32 pool_add(pool_t *pool, void *elt)
-{
-    return _pool_add(pool, elt);
-}
-
-static struct list_head *_pool_get(pool_t *pool)
-{
-    struct list_head *res = pool->list_available.next;
-    pool->available--;
-    list_del(res);
-    return res;
-}
-
-void *pool_get(pool_t *pool)
-{
-    if (!pool)
-        return NULL;
-    if (!pool->available) {
-        block_t *block = malloc(sizeof(block_t) + pool->eltsize * pool->growsize);
-        if (!block) {
-#           ifdef DEBUG_POOL
-            log_f(1, "[%s]: failed block allocation\n", pool->name);
-#           endif
-            errno = ENOMEM;
-            return NULL;
-        }
-
-        /* maintain list of allocated blocks
-         */
-        list_add(&block->list_blocks, &pool->list_blocks);
-        pool->nblocks++;
-
-#       ifdef DEBUG_POOL
-        log_f(1, "[%s]: growing pool from %u to %u elements. block=%p nblocks=%u\n",
-              pool->name,
-              pool->allocated,
-              pool->allocated + pool->growsize,
-              block,
-              pool->nblocks);
-#       endif
-
-        pool->allocated += pool->growsize;
-        for (u32 i = 0; i < pool->growsize; ++i) {
-            void *cur = block->data + i * pool->eltsize;
-#           ifdef DEBUG_POOL
-            log_f(7, "alloc=%p cur=%p\n", block, cur);
-#           endif
-            _pool_add(pool, (struct list_head *)cur);
-        }
-    }
-    /* this is the effective address of the object (and also the
-     * pool list_head address)
-     */
-    return _pool_get(pool);
-}
-
-void pool_destroy(pool_t *pool)
-{
-    block_t *block, *tmp;
-    if (!pool)
-        return;
-    /* release memory blocks */
-#   ifdef DEBUG_POOL
-    log_f(1, "[%s]: releasing %d blocks and main structure\n", pool->name, pool->nblocks);
-    log(5, "blocks:");
-#   endif
-    list_for_each_entry_safe(block, tmp, &pool->list_blocks, list_blocks) {
-#       ifdef DEBUG_POOL
-        log(5, " %p", block);
-#       endif
-        list_del(&block->list_blocks);
-        free(block);
-    }
-#   ifdef DEBUG_POOL
-    log(5, "\n");
-#   endif
-    free(pool);
-}
-
-#ifdef BIN_pool
-struct d {
-    u16 data1;
-    char c;
-    struct list_head list;
-};
-
-static LIST_HEAD (head);
-
-int main(int ac, char**av)
-{
-    pool_t *pool;
-    int total;
-    int action=0;
-    u16 icur=0;
-    char ccur='z';
-    struct d *elt;
-
-    debug_init(3);
-    log_f(1, "%s: sizeof(d)=%lu sizeof(*d)=%lu off=%lu\n", *av, sizeof(elt),
-          sizeof(*elt), offsetof(struct d, list));
-
-    if ((pool = pool_create("dummy", 3, sizeof(*elt)))) {
-        pool_stats(pool);
-        for (int cur=1; cur<ac; ++cur) {
-            total = atoi(av[cur]);
-            if (action == 0) {                    /* add elt to list */
-                log_f(2, "adding %d elements\n", total);
-                for (int i = 0; i < total; ++i) {
-                    elt = pool_get(pool);
-                    elt->data1 = icur++;
-                    elt->c = ccur--;
-                    list_add(&elt->list, &head);
-                }
-                pool_stats(pool);
-                action = 1;
-            } else {                              /* remove one elt from list */
-                log_f(2, "deleting %d elements\n", total);
-                for (int i = 0; i < total; ++i) {
-                    if (!list_empty(&head)) {
-                        elt = list_last_entry(&head, struct d, list);
-                        printf("elt=[%d, %c]\n", elt->data1, elt->c);
-                        list_del(&elt->list);
-                        pool_add(pool, elt);
-                    }
-                }
-                pool_stats(pool);
-                action = 0;
-            }
-        }
-    }
-    pool_stats(pool);
-    pool_destroy(pool);
-}
-#endif

scripts/env.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+#
+# env.sh - set environment for brchess developer.
+#
+# Copyright (C) 2023 Bruno Raoult ("br")
+# Licensed under the GNU General Public License v3.0 or later.
+# Some rights reserved. See COPYING.
+#
+# You should have received a copy of the GNU General Public License along with this
+# program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+#
+# SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+#
+# USAGE: source env.sh [arg]
+#
+# This file will actually be sourced if it was never sourced in current bash
+# environment.
+
+if [[ ! -v _BRCHESS_ENV_ ]]; then
+    export _BRCHESS_ENV_=1 BRCHESS_ROOT LD_LIBRARY_PATH
+    BRCHESS_ROOT=$(realpath -L "$(dirname "${BASH_SOURCE[0]}")/..")
+
+    BRCHESS_SCRIPTDIR="$BRCHESS_ROOT/scripts"
+    BRCHESS_BINDIR="$BRCHESS_ROOT/bin"
+    PATH="$PATH:$BRCHESS_BINDIR:$BRCHESS_SCRIPTDIR"
+
+    BRCHESS_BRLIBDIR="$BRCHESS_ROOT/brlib"
+    BRCHESS_LIBDIR="$BRCHESS_BRLIBDIR/lib"
+    LD_LIBRARY_PATH="${BRCHESS_LIBDIR}${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
+    #printf "R=%s L=%s LD=%s\n" "$BRCHESS_ROOT" "$BRLIB_DIR" "$LD_LIBRARY_PATH"
+    unset BRCHESS_SCRIPTDIR BRCHESS_BINDIR BRCHESS_LIBDIR
+    printf "brchess environment complete.\n"
+fi

scripts/submodules-upd.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+git submodule update --remote --merge

src/attack.c

@@ -0,0 +1,214 @@
+/* attack.c - attack functions.
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "chessdefs.h"
+#include "bitboard.h"
+#include "position.h"
+#include "hyperbola-quintessence.h"
+#include "attack.h"
+
+
+/**
+ * sq_is_attacked() - find if a square is attacked
+ * @pos: position
+ * @occ: occupation mask used
+ * @sq:  square to test
+ * @c:   attacker color
+ *
+ * Find if a @c piece attacks @sq.
+ *
+ * Algorithm:  We perform a reverse attack, and check if any given
+ * piece type on @sq can attack a @c piece of same type.
+ *
+ * For example, if @c is white, we test for all T in P,N,B,R,Q,K if
+ * T on @sq could attack a white T piece.
+ *
+ * @Return: true if @sq is attacked by a @c piece, false otherwise.
+ */
+bool sq_is_attacked(const pos_t *pos, const bitboard_t occ, const square_t sq, const color_t c)
+{
+    color_t opp = OPPONENT(c);
+
+    /* bishop / queen */
+    if (hyperbola_bishop_moves(occ, sq) & (pos->bb[c][BISHOP] | pos->bb[c][QUEEN]))
+        return true;
+
+    /* rook / queen */
+    if (hyperbola_rook_moves(occ, sq) & (pos->bb[c][ROOK] | pos->bb[c][QUEEN]))
+        return true;
+
+    /* pawn */
+    if (bb_pawn_attacks[opp][sq] & pos->bb[c][PAWN])
+        return true;
+
+    /* knight */
+    if (bb_knight_moves(pos->bb[c][KNIGHT], sq))
+        return true;
+
+    /* king */
+    if (bb_king_moves(pos->bb[c][KING], sq))
+        return true;
+
+    return false;
+}
+
+/**
+ * is_in_check() - find if a king is in check.
+ * @pos:   position
+ * @color: king color
+ *
+ * Find if a @c king is in check. This function is a wrapper over @sq_is_attacked().
+ *
+ * @Return: true if @sq is attacked by a @c piece, false otherwise.
+ */
+bool is_in_check(const pos_t *pos, const color_t color)
+{
+    bitboard_t occ = pos_occ(pos);
+    return sq_is_attacked(pos, occ, pos->king[color], OPPONENT(color));
+}
+
+/**
+ * sq_attackers() - find attackers on a square
+ * @pos: position
+ * @occ: occupation mask used
+ * @sq:  square to test
+ * @c:   attacker color
+ *
+ * Find all @c attacks on @sq. En-passant is not considered.
+ *
+ * Algorithm:  We perform a reverse attack, and check if any given
+ * piece type on @sq can attack a @c piece of same type.
+ *
+ * For example, if @c is white, we test for all T in P,N,B,R,Q,K if
+ * T on @sq could attack a white T piece.
+ *
+ * @Return: a bitboard of attackers.
+ */
+bitboard_t sq_attackers(const pos_t *pos, const bitboard_t occ, const square_t sq, const color_t c)
+{
+    bitboard_t attackers = 0, tmp;
+    bitboard_t sqbb = mask(sq);
+    //bitboard_t occ = pos_occ(pos);
+    bitboard_t to;
+    color_t opp = OPPONENT(c);
+
+    /* pawn */
+    to =  pos->bb[c][PAWN];
+    tmp = pawn_shift_upleft(sqbb, opp) & to;
+    attackers |= tmp;
+#   ifdef DEBUG_ATTACK_ATTACKERS1
+    bb_print("att pawn upleft", tmp);
+#   endif
+    tmp = pawn_shift_upright(sqbb, opp) & to;
+    attackers |= tmp;
+#   ifdef DEBUG_ATTACK_ATTACKERS1
+    bb_print("att pawn upright", tmp);
+#   endif
+
+    /* knight & king */
+    to = pos->bb[c][KNIGHT];
+    tmp = bb_knight_moves(to, sq);
+    attackers |= tmp;
+#   ifdef DEBUG_ATTACK_ATTACKERS1
+    bb_print("att knight", tmp);
+#   endif
+    to = pos->bb[c][KING];
+    tmp = bb_king_moves(to, sq);
+    attackers |= tmp;
+#   ifdef DEBUG_ATTACK_ATTACKERS1
+    bb_print("att king", tmp);
+#   endif
+
+    /* bishop / queen */
+    to = pos->bb[c][BISHOP] | pos->bb[c][QUEEN];
+    tmp = hyperbola_bishop_moves(occ, sq) & to;
+    attackers |= tmp;
+#   ifdef DEBUG_ATTACK_ATTACKERS1
+    bb_print("att bishop/queen", tmp);
+#   endif
+
+    /* rook / queen */
+    to = pos->bb[c][ROOK] | pos->bb[c][QUEEN];
+    tmp = hyperbola_rook_moves(occ, sq) & to;
+    attackers |= tmp;
+#   ifdef DEBUG_ATTACK_ATTACKERS1
+    bb_print("att rook/queen", tmp);
+    bb_print("ATTACKERS", attackers);
+    printf("attackers=%lx\n", attackers);
+#   endif
+
+    return attackers;
+}
+
+/**
+ * sq_pinners() - get "pinners" on a square
+ * @pos: position
+ * @sq:  square to test
+ * @color:   attacker color
+ *
+ * Find all @c pieces which are separated from @sq by only one piece (of
+ * any color).
+ *
+ * @Return: bitboard of pinners.
+ */
+bitboard_t sq_pinners(const pos_t *pos, const square_t sq, const color_t color)
+{
+    bitboard_t attackers, pinners = 0;
+    bitboard_t occ = pos_occ(pos);
+    bitboard_t maybe_pinner, tmp, lines;
+
+    /* bishop type */
+    attackers = pos->bb[color][BISHOP] | pos->bb[color][QUEEN];
+    /* occupancy on sq diag and antidiag */
+    lines = (bb_sqdiag[sq] | bb_sqanti[sq]) & occ;
+    bit_for_each64(maybe_pinner, tmp, attackers) {
+        bitboard_t between = bb_between_excl[maybe_pinner][sq];
+        /* keep only squares between AND on sq diag/anti */
+        if (popcount64(between & lines) == 1)
+            pinners |= mask(maybe_pinner);
+    }
+
+    /* same for rook type */
+    attackers = pos->bb[color][ROOK] | pos->bb[color][QUEEN];
+    lines = (bb_sqrank[sq] | bb_sqfile[sq]) & occ;
+    bit_for_each64(maybe_pinner, tmp, attackers) {
+        bitboard_t between = bb_between_excl[maybe_pinner][sq];
+        if (popcount64(between & lines) == 1)
+            pinners |= mask(maybe_pinner);
+    }
+#   ifdef DEBUG_ATTACK_ATTACKERS1
+    char str[32];
+    printf("pinners : %s\n", pos_pinners2str(pos, str, sizeof(str)));
+    printf("pinners : %lx\n", pinners);
+#   endif
+    return pinners;
+}
+
+/**
+ * sq_attackers() - find all attackers on a square
+ * @pos: position
+ * @sq:  square to test
+ *
+ * Find all attacks on @sq. En-passant is not considered.
+ * Just a wrapper over @sq_attackers().
+ *
+ * @Return: a bitboard of attackers.
+ */
+bitboard_t sq_attackers_all(const pos_t *pos, const square_t sq)
+{
+    bitboard_t occ = pos_occ(pos);
+    return sq_attackers(pos, occ, sq, WHITE) | sq_attackers(pos, occ, sq, BLACK);
+}

src/attack.h

@@ -0,0 +1,26 @@
+/* attack.h - attack functions.
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#ifndef _ATTACK_H
+#define _ATTACK_H
+
+#include "chessdefs.h"
+#include "bitboard.h"
+
+bool sq_is_attacked(const pos_t *pos, const bitboard_t occ, const square_t sq, const color_t c);
+bool is_in_check(const pos_t *pos, const color_t color);
+
+bitboard_t sq_attackers(const pos_t *pos, const bitboard_t occ, const square_t sq, const color_t c);
+bitboard_t sq_attackers_all(const pos_t *pos, const square_t sq);
+bitboard_t sq_pinners(const pos_t *pos, const square_t sq, const color_t c);
+#endif

src/bitboard.c

@@ -0,0 +1,330 @@
+/* bitboard.c - bitboard functions.
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "brlib.h"
+
+#include "chessdefs.h"
+#include "piece.h"
+#include "board.h"
+#include "bitboard.h"
+
+bitboard_t bb_sq[64];
+bitboard_t bb_sqrank[64], bb_sqfile[64], bb_sqdiag[64], bb_sqanti[64];
+bitboard_t bb_between_excl[64][64];
+bitboard_t bb_between[64][64];
+bitboard_t bb_line[64][64];
+
+bitboard_t bb_knight[64], bb_king[64], bb_pawn_attacks[2][64];
+
+/*  vectors are clockwise from N */
+static int knight_vector[] = {
+    NORTH_EAST + NORTH, NORTH_EAST + EAST,
+    SOUTH_EAST + EAST,  SOUTH_EAST + SOUTH,
+    SOUTH_WEST + SOUTH, SOUTH_WEST + WEST,
+    NORTH_WEST + WEST,  NORTH_WEST + NORTH
+};
+static int king_vector[8] = {
+    NORTH, NORTH_EAST, EAST, SOUTH_EAST,
+    SOUTH, SOUTH_WEST, WEST, NORTH_WEST
+};
+
+/**
+ * bitboard_between_excl() - get bitboard of squares between two squares.
+ * @sq1, @sq2: The two square_t squares
+ *
+ * From: http://www.talkchess.com/forum3/viewtopic.php?f=7&t=12499&start=14
+ * This function may be used instead of bb_XXX arrays if cache pressure is high.
+ *
+ * @Return: bitboard_t, squares between @sq1 and @sq2 (excl. @sq1 and @sq2).
+ */
+bitboard_t bitboard_between_excl(square_t sq1, square_t sq2)
+{
+    const bitboard_t m1 = -1;
+    const bitboard_t a2a7 = C64(0x0001010101010100);
+    const bitboard_t b7h1 = C64(0x0002040810204080);
+    bitboard_t btwn_bits, ray_bits;
+    u32 rank_diff, file_diff, anti_diff, diag_diff;
+
+    btwn_bits  =  (m1 << sq1) ^ (m1 << sq2);      /* includes sq1 and sq2 */
+    rank_diff  = ((sq2 | 7) - sq1) >> 3,          /* signed */
+        file_diff  =  (sq2 & 7) - (sq1 & 7);          /* signed */
+
+    anti_diff  =  rank_diff  + file_diff;
+    rank_diff  =  rank_diff  & 15;
+    file_diff  =  file_diff  & 15;
+    anti_diff  =  anti_diff  & 15;
+    diag_diff  =  rank_diff  ^ file_diff;
+    ray_bits   =  2 * ((rank_diff - 1) >> 26);
+
+    ray_bits  |=  bswap64((m1 + diag_diff) & b7h1);
+    ray_bits  |=  (m1 + anti_diff) & b7h1;
+    ray_bits  |=  (m1 + file_diff) & a2a7;
+    ray_bits  *=  btwn_bits  &  -btwn_bits;
+    return ray_bits & btwn_bits;
+}
+
+/**
+ * bitboard_init() - initialize general bitboards
+ *
+ * Generate the following bitboards :
+ *   bb_sq[64]: square to bitboard
+ *   bb_sqrank[64]: square to rank
+ *   bb_sqfile[64]: square to file
+ *   bb_sqdiag[64]: square to diagonal
+ *   bb_sqanti[64]: square to antidiagonal
+ *
+ *   bb_between_excl[64][64]: strict squares between two squares
+ *   bb_between[64][64]: squares between two squares including second square
+ *
+ * And the following pseudo move masks:
+ *   bb_knight[64]: knight moves
+ *   bb_king[64]: king moves
+ *
+ */
+void bitboard_init(void)
+{
+    /*  for each square, the 4 masks: file, rank, diagonal, antidiagonal */
+    struct { int df, dr; } vecs[4] = {
+        { 0,  1 },                                /* vertical/file */
+        { 1,  0 },                                /* horizontal/rank */
+        { 1,  1 },                                /* diagonal */
+        { 1, -1 },                                /* antidiagonal */
+    } ;
+    bitboard_t tmpbb[64][4] = { 0 };
+
+    /* 1) square to bitboard
+     *    in-between, sq2 excluded
+     */
+    for (square_t sq1 = A1; sq1 <= H8; ++sq1) {
+        bb_sq[sq1] = mask(sq1);
+        for (square_t sq2 = A1; sq2 <= H8; ++sq2)
+            bb_between_excl[sq1][sq2] = bitboard_between_excl(sq1, sq2);
+    }
+
+    /* 2) sq1-to-sq2 mask, sq2 included
+     *    square to file/rank/dia/anti bitmaps
+     */
+    for (square_t sq = 0; sq < 64; ++sq) {
+        file_t f = sq_file(sq);
+        rank_t r = sq_rank(sq);
+        for (int vec = 0; vec < 4; ++vec) {
+            tmpbb[sq][vec] |= mask(sq_make(f, r));
+            for (int dir = -1; dir <= 1; dir += 2) {
+                file_t df = dir * vecs[vec].df, f2 = f + df;
+                rank_t dr = dir * vecs[vec].dr, r2 = r + dr;
+                bitboard_t mask_between = 0;
+                while (sq_coord_ok(f2) && sq_coord_ok(r2)) {
+                    square_t dest = sq_make(f2, r2);
+                    tmpbb[sq][vec] |= mask(dest);
+                    mask_between |= mask(dest);
+                    bb_between[sq][dest] = mask_between;
+                    f2 += df, r2 += dr;
+                }
+            }
+        }
+    }
+    for (square_t sq = 0; sq < 64; ++sq) {
+        bb_sqfile[sq] = tmpbb[sq][0];
+        bb_sqrank[sq] = tmpbb[sq][1];
+        bb_sqdiag[sq] = tmpbb[sq][2];
+        bb_sqanti[sq] = tmpbb[sq][3];
+    }
+    for (square_t sq1 = 0; sq1 < 64; ++sq1) {
+        for (square_t sq2 = 0; sq2 < 64; ++sq2) {
+            if (sq1 != sq2) {
+                if (bb_sqfile[sq1] == bb_sqfile[sq2])
+                    bb_line[sq1][sq2] = bb_sqfile[sq1];
+                else if (bb_sqrank[sq1] == bb_sqrank[sq2])
+                    bb_line[sq1][sq2] = bb_sqrank[sq1];
+                else if (bb_sqdiag[sq1] == bb_sqdiag[sq2])
+                    bb_line[sq1][sq2] = bb_sqdiag[sq1];
+                else if (bb_sqanti[sq1] == bb_sqanti[sq2])
+                    bb_line[sq1][sq2] = bb_sqanti[sq1];
+            }
+        }
+    }
+
+    /* 3) pawn, knight and king attacks
+     */
+    for (square_t sq = A1; sq <= H8; ++sq) {
+        if (sq >= A2)
+            bb_pawn_attacks[BLACK][sq] = pawn_attacks_bb(mask(sq), BLACK);
+        if (sq <= H7)
+            bb_pawn_attacks[WHITE][sq] = pawn_attacks_bb(mask(sq), WHITE);
+
+        for (int vec = 0; vec < 8; ++vec) {
+            int dst = sq + knight_vector[vec];
+            if (sq_ok(dst)) {
+                if (sq_dist(dst, sq) == 2) {
+                    bb_knight[sq] |= bb_sq[dst];
+                }
+            }
+            dst = sq + king_vector[vec];
+            if (sq_ok(dst)) {
+                if (sq_dist(dst, sq) == 1) {
+                    bb_king[sq] |= bb_sq[dst];
+                }
+            }
+        }
+    }
+}
+
+
+/**
+ * bb_knight_moves() - get bitboard of knight pseudo-moves
+ * @notmine: bitboard_t of squares not occupied by own pieces
+ * @sq: knight square
+ *
+ * @Return: bitboard of available moves.
+ */
+bitboard_t bb_knight_moves(bitboard_t notmine, square_t sq)
+{
+    return bb_knight[sq] & notmine;
+}
+
+/**
+ * bb_king_moves() - get bitboard of king pseudo-moves
+ * @notmine: bitboard_t of squares not occupied by own pieces
+ * @sq: king square
+ *
+ * @Return: bitboard of available moves.
+ */
+bitboard_t bb_king_moves(bitboard_t notmine, square_t sq)
+{
+    return bb_king[sq] & notmine;
+}
+
+/**
+ * bb_print() - print simple bitboard representation
+ * @title: a string or NULL
+ * @bitboard: the bitboard
+ */
+void bb_print(const char *title, const bitboard_t bitboard)
+{
+    //char c = p? p: 'X';
+    if (title)
+        printf("%s\n", title);
+    for (rank_t r = RANK_8; r >= RANK_1; --r) {
+        printf("%d ", r + 1);
+        for (file_t f = FILE_A; f <= FILE_H; ++f) {
+            printf(" %c", bitboard & bb_sq[sq_make(f, r)] ? 'X': '.');
+        }
+        printf("\n");
+    }
+    printf("   a b c d e f g h\n");
+    return;
+}
+
+/**
+ * bb_print_multi() - print multiple bitboards horizontally
+ * @title: a string or NULL
+ * @n: number of bitboards
+ * @bb_ptr...: pointers to bitboards
+ *
+ * @n is the number of bitboards to print. If @n > 10, it is reduced to 10
+ */
+void bb_print_multi(const char *title, int n, ...)
+{
+    bitboard_t bb[8];
+    va_list ap;
+
+    n = min(n, 10);
+
+    va_start(ap, n);
+    for (int i = 0; i < n; ++i) {                 /* save all bitboards */
+        bb[i] = va_arg(ap, bitboard_t);
+    }
+    va_end(ap);
+
+    if (title)
+        printf("%s\n", title);
+
+    for (rank_t r = RANK_8; r >= RANK_1; --r) {
+        for (int i = 0; i < n; ++i) {
+            printf("%d ", r + 1);
+            for (file_t f = FILE_A; f <= FILE_H; ++f) {
+                printf(" %c", bb[i] & bb_sq[sq_make(f, r)] ? 'X': '.');
+            }
+            printf("    ");
+        }
+        printf("\n");
+    }
+    for (int i = 0; i < n; ++i) {
+        printf("   a b c d e f g h");
+        printf("    ");
+    }
+    printf("\n");
+    return;
+}
+
+/**
+ * bb_rank_sprint() - print an u8 rank binary representation
+ * @str: the destination string
+ * @bb8: the uchar to print
+ *
+ * @return: @str, filled with ascii representation
+ */
+char *bb_rank_sprint(char *str, const uchar bb8)
+{
+    file_t f;
+    for (f = FILE_A; f <= FILE_H; ++f) {
+        *(str + f) = bb8 & mask(f) ? '1': '.';
+    }
+    *(str + f) = 0;
+    //printf(" 0 1 2 3 4 5 6 7\n");
+    //printf("\n");
+    return str;
+}
+
+/**
+ * bb_sq2str() - convert bitboard to a string with a list of squares.
+ * @bb:  bitboard
+ * @str: destination string
+ * @len: max @str length
+ *
+ * @str will be filled with the list of string representation of @bb, up to @len
+ * characters.
+ * 3 characters are used per square, so, for example, @str len should be :
+ * - For a valid position checkers (two checkers max): 2*3 + 1 = 7.
+ * - For a valid position pinners (8 pinners): 8*3 + 1 = 25.
+ * - for a full bitboard: 64*3 + 1 = 193.
+ *
+ * If @len is not enough to fill all moves, the last fitting move is replaced by "...".
+ *
+ * @return: The string.
+ */
+char *bb_sq2str(const bitboard_t bb, char *str, const int len)
+{
+    bitboard_t tmp, sq;
+    int nocc = popcount64(bb);
+    int needed = 3 * nocc + 1;
+    int willdo = (int) len >= needed ? nocc: (len - 1) / 3 - 1;
+    int current = 0;
+
+    //printf("sq2str bb=%lx len=%d willdo=%d\n", bb, len, willdo);
+    bit_for_each64(sq, tmp, bb) {
+        if (current == willdo) {
+            strcpy(str + current * 3, "...");
+        } else {
+            strcpy(str + current * 3, sq_to_string(sq));
+            str[current * 3 + 2] = ' ';
+        }
+        if (++current > willdo)
+            break;
+    }
+    str[current * 3] = 0;
+    return str;
+}

src/bitboard.h

@@ -1,6 +1,6 @@
 /* bitboard.h - bitboard definitions.
  *
- * Copyright (C) 2021 Bruno Raoult ("br")
+ * Copyright (C) 2021-2024 Bruno Raoult ("br")
  * Licensed under the GNU General Public License v3.0 or later.
  * Some rights reserved. See COPYING.
  *
@@ -11,60 +11,329 @@
  *
  */
 
-#ifndef BITBOARD_H
-#define BITBOARD_H
+#ifndef _BITBOARD_H
+#define _BITBOARD_H
 
-#include <bits.h>
+#include <brlib.h>
+#include <bitops.h>
 
 #include "chessdefs.h"
+#include "board.h"
 #include "piece.h"
 
-enum bb_square {
-    A1 = 1UL <<  0, B1 = 1UL <<  1, C1 = 1UL <<  2, D1 = 1UL <<  3,
-    E1 = 1UL <<  4, F1 = 1UL <<  5, G1 = 1UL <<  6, H1 = 1UL <<  7,
+/* mapping square -> bitboard */
+extern bitboard_t bb_sq[64];
+/* squares between sq1 and sq2, exclusing both */
+extern bitboard_t bb_between_excl[64][64];
+/* squares between sq1 and sq2, including sq2 */
+extern bitboard_t bb_between[64][64];
 
-    A2 = 1UL <<  8, B2 = 1UL <<  9, C2 = 1UL << 10, D2 = 1UL << 11,
-    E2 = 1UL << 12, F2 = 1UL << 13, G2 = 1UL << 14, H2 = 1UL << 15,
+/**
+ * bb_sqrank[64]: square to rank
+ * bb_sqfile[64]: square to file
+ * bb_sqdiag[64]: square to diagonal
+ * bb_sqanti[64]: square to antidiagonal
+ */
+extern bitboard_t bb_sqrank[64], bb_sqfile[64], bb_sqdiag[64], bb_sqanti[64];
 
-    A3 = 1UL << 16, B3 = 1UL << 17, C3 = 1UL << 18, D3 = 1UL << 19,
-    E3 = 1UL << 20, F3 = 1UL << 21, G3 = 1UL << 22, H3 = 1UL << 23,
+/* line (rank, file, diagonal or anti-diagonal) between two squares */
+extern bitboard_t bb_line[64][64];
 
-    A4 = 1UL << 24, B4 = 1UL << 25, C4 = 1UL << 26, D4 = 1UL << 27,
-    E4 = 1UL << 28, F4 = 1UL << 29, G4 = 1UL << 30, H4 = 1UL << 31,
+/* pawn, knight and king attacks */
+extern bitboard_t bb_knight[64], bb_king[64], bb_pawn_attacks[2][64];
 
-    A5 = 1UL << 32, B5 = 1UL << 33, C5 = 1UL << 34, D5 = 1UL << 35,
-    E5 = 1UL << 36, F5 = 1UL << 37, G5 = 1UL << 38, H5 = 1UL << 39,
+/* TODO (maybe C23?) when we can ensure an enum can be u64
+ *
+ * enum {
+ *     A1bb = mask(A1), A2bb = mask(A2), A3bb = mask(A3), A4bb = mask(A4),
+ *     A5bb = mask(A5), A6bb = mask(A6), A7bb = mask(A7), A8bb = mask(A8),
+ *     B1bb = mask(B1), B2bb = mask(B2), B3bb = mask(B3), B4bb = mask(B4),
+ *     B5bb = mask(B5), B6bb = mask(B6), B7bb = mask(B7), B8bb = mask(B8),
+ *     C1bb = mask(C1), C2bb = mask(C2), C3bb = mask(C3), C4bb = mask(C4),
+ *     C5bb = mask(C5), C6bb = mask(C6), C7bb = mask(C7), C8bb = mask(C8),
+ *     D1bb = mask(D1), D2bb = mask(D2), D3bb = mask(D3), D4bb = mask(D4),
+ *     D5bb = mask(D5), D6bb = mask(D6), D7bb = mask(D7), D8bb = mask(D8),
+ *     E1bb = mask(E1), E2bb = mask(E2), E3bb = mask(E3), E4bb = mask(E4),
+ *     E5bb = mask(E5), E6bb = mask(E6), E7bb = mask(E7), E8bb = mask(E8),
+ *     F1bb = mask(F1), F2bb = mask(F2), F3bb = mask(F3), F4bb = mask(F4),
+ *     F5bb = mask(F5), F6bb = mask(F6), F7bb = mask(F7), F8bb = mask(F8),
+ *     G1bb = mask(G1), G2bb = mask(G2), G3bb = mask(G3), G4bb = mask(G4),
+ *     G5bb = mask(G5), G6bb = mask(G6), G7bb = mask(G7), G8bb = mask(G8),
+ *     H1bb = mask(H1), H2bb = mask(H2), H3bb = mask(H3), H4bb = mask(H4),
+ *     H5bb = mask(H5), H6bb = mask(H6), H7bb = mask(H7), H8bb = mask(H8),
+ * };
+ *
+ * enum {
+ *     FILE_Abb = 0x0101010101010101ull, FILE_Bbb = 0x0202020202020202ull,
+ *     FILE_Cbb = 0x0404040404040404ull, FILE_Dbb = 0x0808080808080808ull,
+ *     FILE_Ebb = 0x1010101010101010ull, FILE_Fbb = 0x2020202020202020ull,
+ *     FILE_Gbb = 0x4040404040404040ull, FILE_Hbb = 0x8080808080808080ull,
+ *
+ *     RANK_1bb = 0x00000000000000ffull, RANK_2bb = 0x000000000000ff00ull,
+ *     RANK_3bb = 0x0000000000ff0000ull, RANK_4bb = 0x00000000ff000000ull,
+ *     RANK_5bb = 0x000000ff00000000ull, RANK_6bb = 0x0000ff0000000000ull,
+ *     RANK_7bb = 0x00ff000000000000ull, RANK_8bb = 0xff00000000000000ull
+ * };
+ */
 
-    A6 = 1UL << 40, B6 = 1UL << 41, C6 = 1UL << 42, D6 = 1UL << 43,
-    E6 = 1UL << 44, F6 = 1UL << 45, G6 = 1UL << 46, H6 = 1UL << 47,
+/* generated with bash:
+ * R="ABCDEFGH"
+ * F="12345678"
+ * for i in {0..63}; do
+ *   printf "#define  %c%cbb %#018llxull\n" ${R:i/8:1} ${F:i%8:1} $((1 << i))
+ * done
+ */
+#define A1bb     0x0000000000000001ull
+#define A2bb     0x0000000000000002ull
+#define A3bb     0x0000000000000004ull
+#define A4bb     0x0000000000000008ull
+#define A5bb     0x0000000000000010ull
+#define A6bb     0x0000000000000020ull
+#define A7bb     0x0000000000000040ull
+#define A8bb     0x0000000000000080ull
+#define B1bb     0x0000000000000100ull
+#define B2bb     0x0000000000000200ull
+#define B3bb     0x0000000000000400ull
+#define B4bb     0x0000000000000800ull
+#define B5bb     0x0000000000001000ull
+#define B6bb     0x0000000000002000ull
+#define B7bb     0x0000000000004000ull
+#define B8bb     0x0000000000008000ull
+#define C1bb     0x0000000000010000ull
+#define C2bb     0x0000000000020000ull
+#define C3bb     0x0000000000040000ull
+#define C4bb     0x0000000000080000ull
+#define C5bb     0x0000000000100000ull
+#define C6bb     0x0000000000200000ull
+#define C7bb     0x0000000000400000ull
+#define C8bb     0x0000000000800000ull
+#define D1bb     0x0000000001000000ull
+#define D2bb     0x0000000002000000ull
+#define D3bb     0x0000000004000000ull
+#define D4bb     0x0000000008000000ull
+#define D5bb     0x0000000010000000ull
+#define D6bb     0x0000000020000000ull
+#define D7bb     0x0000000040000000ull
+#define D8bb     0x0000000080000000ull
+#define E1bb     0x0000000100000000ull
+#define E2bb     0x0000000200000000ull
+#define E3bb     0x0000000400000000ull
+#define E4bb     0x0000000800000000ull
+#define E5bb     0x0000001000000000ull
+#define E6bb     0x0000002000000000ull
+#define E7bb     0x0000004000000000ull
+#define E8bb     0x0000008000000000ull
+#define F1bb     0x0000010000000000ull
+#define F2bb     0x0000020000000000ull
+#define F3bb     0x0000040000000000ull
+#define F4bb     0x0000080000000000ull
+#define F5bb     0x0000100000000000ull
+#define F6bb     0x0000200000000000ull
+#define F7bb     0x0000400000000000ull
+#define F8bb     0x0000800000000000ull
+#define G1bb     0x0001000000000000ull
+#define G2bb     0x0002000000000000ull
+#define G3bb     0x0004000000000000ull
+#define G4bb     0x0008000000000000ull
+#define G5bb     0x0010000000000000ull
+#define G6bb     0x0020000000000000ull
+#define G7bb     0x0040000000000000ull
+#define G8bb     0x0080000000000000ull
+#define H1bb     0x0100000000000000ull
+#define H2bb     0x0200000000000000ull
+#define H3bb     0x0400000000000000ull
+#define H4bb     0x0800000000000000ull
+#define H5bb     0x1000000000000000ull
+#define H6bb     0x2000000000000000ull
+#define H7bb     0x4000000000000000ull
+#define H8bb     0x8000000000000000ull
 
-    A7 = 1UL << 48, B7 = 1UL << 49, C7 = 1UL << 50, D7 = 1UL << 51,
-    E7 = 1UL << 52, F7 = 1UL << 53, G7 = 1UL << 54, H7 = 1UL << 55,
+#define FILE_Abb 0x0101010101010101ull
+#define FILE_Bbb 0x0202020202020202ull
+#define FILE_Cbb 0x0404040404040404ull
+#define FILE_Dbb 0x0808080808080808ull
+#define FILE_Ebb 0x1010101010101010ull
+#define FILE_Fbb 0x2020202020202020ull
+#define FILE_Gbb 0x4040404040404040ull
+#define FILE_Hbb 0x8080808080808080ull
 
-    A8 = 1UL << 56, B8 = 1UL << 57, C8 = 1UL << 58, D8 = 1UL << 59,
-    E8 = 1UL << 60, F8 = 1UL << 61, G8 = 1UL << 62, H8 = 1UL << 63,
-};
+#define RANK_1bb 0x00000000000000ffull
+#define RANK_2bb 0x000000000000ff00ull
+#define RANK_3bb 0x0000000000ff0000ull
+#define RANK_4bb 0x00000000ff000000ull
+#define RANK_5bb 0x000000ff00000000ull
+#define RANK_6bb 0x0000ff0000000000ull
+#define RANK_7bb 0x00ff000000000000ull
+#define RANK_8bb 0xff00000000000000ull
 
-enum bb_files {
-    F_1 = A1 | A2 | A3 | A4 | A5 | A6 | A7 | A8,
-    F_2 = B1 | B2 | B3 | B4 | B5 | B6 | B7 | B8,
-    F_3 = C1 | C2 | C3 | C4 | C5 | C6 | C7 | C8,
-    F_4 = D1 | D2 | D3 | D4 | D5 | D6 | D7 | D8,
-    F_5 = E1 | E2 | E3 | E4 | E5 | E6 | E7 | E8,
-    F_6 = F1 | F2 | F3 | F4 | F5 | F6 | F7 | F8,
-    F_7 = G1 | G2 | G3 | G4 | G5 | G6 | G7 | G8,
-    F_8 = H1 | H2 | H3 | H4 | H5 | H6 | H7 | H8,
-};
 
-enum bb_ranges {
-    R_1 = A1 | B1 | C1 | D1 | E1 | F1 | G1 | H1,
-    R_2 = A2 | B2 | C2 | D2 | E2 | F2 | G2 | H2,
-    R_3 = A3 | B3 | C3 | D3 | E3 | F3 | G3 | H3,
-    R_4 = A4 | B4 | C4 | D4 | E4 | F4 | G4 | H4,
-    R_5 = A5 | B5 | C5 | D5 | E5 | F5 | G5 | H5,
-    R_6 = A6 | B6 | C6 | D6 | E6 | F6 | G6 | H6,
-    R_7 = A7 | B7 | C7 | D7 | E7 | F7 | G7 | H7,
-    R_8 = A8 | B8 | C8 | D8 | E8 | F8 | G8 | H8,
-};
+/*
+static __always_inline bitboard_t bb_rank(int rank)
+{
+    return RANK_1bb << (rank * 8);
+}
+static __always_inline bitboard_t bb_rel_rank(int rank, color)
+{
+    return RANK_1bb << (rank * 8);
+}
+static __always_inline bitboard_t bb_file(int file)
+{
+    return FILE_Abb << file;
+}
+*/
 
-#endif  /* BOARD_H */
+/**
+ * bb_first_bb() - return bitboard of first square of a bitboard.
+ * @bb: bitboard
+ *
+ * bb must be non-zero.
+ *
+ * @return: bitboard of first square (lsb) of @bb.
+ */
+static __always_inline square_t bb_first_bb(bitboard_t bb)
+{
+    return bb & -bb;
+}
+
+/**
+ * bb_next() - clear and return next (lsb) square of a bitboard.
+ * @bb: &bitboard
+ *
+ * The bitboard addressed by @bb must be non-zero.
+ *
+ * @return: first bit (lsb) of @bb.
+ */
+static __always_inline square_t bb_next(bitboard_t *bb)
+{
+    square_t sq = ctz64(*bb);
+    *bb &= *bb - 1;
+    return sq;
+}
+
+/**
+ * bb_multiple() - test if a bitboard has multiple bits.
+ * @bb: bitboard
+ *
+ * @return: true if @bb has more than 1 bit, false otherwise.
+ */
+static __always_inline bool bb_multiple(bitboard_t bb)
+{
+    return !!(bb & (bb - 1));
+}
+
+/**
+ * bb_shift() - shift bitboard
+ * @bb: bitboard
+ *
+ * No control is done on off-board shifting (i.e. shifting -1 from A2 gives H3).
+ *
+ * @return: true if @bb has more than 1 bit, false otherwise.
+ */
+static __always_inline bitboard_t bb_shift(bitboard_t bb, int shift)
+{
+   return shift >= 0 ? bb << shift : bb >> -shift;
+}
+
+
+#define bb_rank(r)        ((u64) RANK_1bb << ((r) * 8))
+#define bb_file(f)        ((u64) FILE_Abb << (f))
+
+#define bb_rel_rank(r, c) bb_rank(sq_rel_rank(r, c))
+#define bb_rel_file(f, c) bb_file(sq_rel_rank(f, c))
+
+/**
+ * bb_sq_aligned() - check if two squares are aligned (same file or rank).
+ * @sq1, @sq2:  the two squares.
+ *
+ * @return: true if @sq1 and @sq2 are on same line, false otherwise.
+ */
+static __always_inline bool bb_sq_aligned(square_t sq1, square_t sq2)
+{
+    return bb_line[sq1][sq2];
+}
+
+/**
+ * bb_sq_aligned3() - check if 3 squares are aligned (same file or rank).
+ * @sq1, @sq2, @sq3:  the three squares.
+ *
+ * @return: true if @sq1, @sq2, and @sq3 are aligned, false otherwise.
+ */
+static __always_inline bool bb_sq_aligned3(square_t sq1, square_t sq2, square_t sq3)
+{
+    return bb_line[sq1][sq2] & mask(sq3);
+}
+
+/**
+ * bb_sq_between() - check if a square is between two squares
+ * @sq:  the possibly "in-between" square
+ * @sq1: square 1
+ * @sq2: square 2
+ *
+ * @return: bitboard of @sq if between @sq1 and @sq2.
+ */
+static __always_inline bitboard_t bb_sq_between(square_t sq, square_t sq1, square_t sq2)
+{
+    return bb_between_excl[sq1][sq2] & mask(sq);
+}
+
+/* TODO: when OK, replace with macros */
+static __always_inline bitboard_t shift_n(const bitboard_t bb)
+{
+    return bb << NORTH;
+}
+static __always_inline bitboard_t shift_ne(const bitboard_t bb)
+{
+    return (bb & ~FILE_Hbb) << NORTH_EAST;
+}
+static __always_inline bitboard_t shift_e(const bitboard_t bb)
+{
+    return (bb & ~FILE_Hbb) << EAST;
+}
+static __always_inline bitboard_t shift_se(const bitboard_t bb)
+{
+    return (bb & ~FILE_Hbb) >> -SOUTH_EAST;
+}
+static __always_inline bitboard_t shift_s(const bitboard_t bb)
+{
+    return bb >> -SOUTH;
+}
+static __always_inline bitboard_t shift_sw(const bitboard_t bb)
+{
+    return (bb & ~FILE_Abb) >> -SOUTH_WEST;
+}
+static __always_inline bitboard_t shift_w(const bitboard_t bb)
+{
+    return (bb & ~FILE_Abb) >> -WEST;
+}
+static __always_inline bitboard_t shift_nw(const bitboard_t bb)
+{
+    return (bb & ~FILE_Abb) << NORTH_WEST;
+}
+
+/* pawn moves/attacks (for bitboards) */
+#define pawn_shift_up(bb, c)      ((c) == WHITE ? shift_n(bb): shift_s(bb))
+#define pawn_shift_upleft(bb, c)  ((c) == WHITE ? shift_nw(bb): shift_se(bb))
+#define pawn_shift_upright(bb, c) ((c) == WHITE ? shift_ne(bb): shift_sw(bb))
+
+#define pawn_attacks_bb(bb, c)    (pawn_shift_upleft(bb, c) |                   \
+                                   pawn_shift_upright(bb, c))
+
+/* pawn move (for single pawn) - NO SQUARE CONTROL HERE !
+ * Need to make functions with control instead.
+ */
+#define pawn_push_up(sq, c)       ((sq) + ((c) == WHITE ? NORTH:      SOUTH))
+//#define pawn_push_upleft(sq, c)   ((sq) + ((c) == WHITE ? NORTH_WEST: SOUTH_EAST))
+//#define pawn_push_upright(sq, c)  ((sq) + ((c) == WHITE ? NORTH_EAST: SOUTH_WEST))
+
+bitboard_t bitboard_between_excl(square_t sq1, square_t sq2);
+void bitboard_init(void);
+
+bitboard_t bb_knight_moves(bitboard_t notmine, square_t sq);
+bitboard_t bb_king_moves(bitboard_t notmine, square_t sq);
+
+void bb_print(const char *title, const bitboard_t bitboard);
+void bb_print_multi(const char *title, const int n, ...);
+char *bb_rank_sprint(char *str, const uchar bb8);
+char *bb_sq2str(const bitboard_t bb, char *str, int len);
+
+#endif  /* _BITBOARD_H */

src/board.c

@@ -0,0 +1,128 @@
+/* board.c - 8x8 functions.
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stdio.h>
+#include <ctype.h>
+
+#include "brlib.h"
+#include "board.h"
+#include "bitboard.h"
+
+static const char *sq_strings[] = {
+    "a1", "b1", "c1", "d1", "e1", "f1", "g1", "h1",
+    "a2", "b2", "c2", "d2", "e2", "f2", "g2", "h2",
+    "a3", "b3", "c3", "d3", "e3", "f3", "g3", "h3",
+    "a4", "b4", "c4", "d4", "e4", "f4", "g4", "h4",
+    "a5", "b5", "c5", "d5", "e5", "f5", "g5", "h5",
+    "a6", "b6", "c6", "d6", "e6", "f6", "g6", "h6",
+    "a7", "b7", "c7", "d7", "e7", "f7", "g7", "h7",
+    "a8", "b8", "c8", "d8", "e8", "f8", "g8", "h8",
+};
+
+/**
+ * sq_to_string() - return a square string
+ * @square: square (0-64)
+ *
+ * @Return: Pointer to @square string representation ("a1"-"h8").
+ */
+const char *sq_to_string(const square_t square)
+{
+    return sq_strings[square];
+}
+
+/**
+ * sq_from_string() - return a square from a string
+ * @sqstr: the square representation (a1-h8)
+ *
+ * @Return: square_t representation of str.
+ */
+square_t sq_from_string(const char *sqstr)
+{
+    file_t f = C2FILE(sqstr[0]);
+    rank_t r = C2RANK(sqstr[1]);
+    return sq_coord_ok(f) && sq_coord_ok(r) ? sq_make(f, r): SQUARE_NONE;
+}
+
+/**
+ * board_print() - Print a board
+ * @board:  &board_t to print
+ */
+void board_print(const piece_t *board)
+{
+    printf("  +---+---+---+---+---+---+---+---+\n");
+    for (int rank = 7; rank >= 0; --rank) {
+        printf("%c |", rank + '1');
+        for (int file = 0; file < 8; ++file) {
+            piece_t pc = board[sq_make(file, rank)];
+#           ifdef DIAGRAM_SYM
+            printf(" %s |", pc? piece_to_sym(pc): " ");
+#           else
+            printf(" %s |", pc? piece_to_fen(pc): " ");
+#           endif
+        }
+        printf("\n  +---+---+---+---+---+---+---+---+\n");
+    }
+    printf("    A   B   C   D   E   F   G   H\n");
+}
+
+/**
+ * board_print_mask() - Print a board position with some reversed squares
+ * @board:  &board_t to print
+ * @mask:   a bitboard indicating reverse color displayed squares
+ *
+ * Squares corresponding to @mask will be displayed in reverse colors.
+ */
+void board_print_mask(const piece_t *board, const bitboard_t mask)
+{
+    // 6: blink
+#   define REVERSE "\e[7m▌"
+#   define RESET   "▐\e[0m"
+    printf("  +---+---+---+---+---+---+---+---+\n");
+    for (int rank = 7; rank >= 0; --rank) {
+        printf("%c |", rank + '1');
+        for (int file = 0; file < 8; ++file) {
+            square_t sq = sq_make(file, rank);
+            piece_t pc = board[sq];
+            bitboard_t set = mask(sq) & mask;
+            printf("%s", set? REVERSE : " ");
+#           ifdef DIAGRAM_SYM
+            printf("%s", pc? piece_to_sym(pc): " ");
+#           else
+            printf("%s", pc? piece_to_char_color(pc): " ");
+#           endif
+            printf("%s|", set? RESET : " ");
+        }
+        printf("\n  +---+---+---+---+---+---+---+---+\n");
+    }
+    printf("    A   B   C   D   E   F   G   H\n");
+}
+
+/**
+ * board_print_raw - print raw (octal or FEN symbol) board
+ * @bb: the bitboard
+ * @type: int, 0 for octal, 1 for fen symbol
+ */
+void board_print_raw(const piece_t *board, const int type)
+{
+    for (rank_t r = RANK_8; r >= RANK_1; --r) {
+        for (file_t f = FILE_A; f <= FILE_H; ++f) {
+            piece_t p = board[sq_make(f, r)];
+            if (type) {
+                printf("%s ", p == EMPTY? ".": piece_to_char(p));
+            } else {
+                printf("%02o ", p);
+            }
+        }
+        printf("\n");
+    }
+}

src/board.h

@@ -1,6 +1,6 @@
-/* board.h - board definitions.
+/* board.h - 8x8 board definitions.
  *
- * Copyright (C) 2021 Bruno Raoult ("br")
+ * Copyright (C) 2021-2024 Bruno Raoult ("br")
  * Licensed under the GNU General Public License v3.0 or later.
  * Some rights reserved. See COPYING.
  *
@@ -11,70 +11,83 @@
  *
  */
 
-#ifndef BOARD_H
-#define BOARD_H
+#ifndef _BOARD_H
+#define _BOARD_H
+
+#include "brlib.h"
 
-#include <stdint.h>
 #include "chessdefs.h"
 #include "piece.h"
+#include "bitboard.h"
 
-typedef struct board_s {
-    piece_t piece;
-    piece_list_t *s_piece;
-    //struct list_head *s_piece;
-} board_t;                                        /* 0x88 board */
-#define BOARDSIZE    (8*8*2)
+/* from human to machine */
+#define C2FILE(c)          (tolower(c) - 'a')
+#define C2RANK(c)          (tolower(c) - '1')
+/* from machine to human */
+#define FILE2C(f)          ((f) + 'a')
+#define RANK2C(r)          ((r) + '1')
 
-/* definitions for 0x88 representation
+/* a square is defined as
+ * rrrfff
  */
-#define SQ88(f, r)  (((r) << 4) | (f))            /* from rank,file to sq88 */
-#define F88(s)      ((s) & 0x0f)                  /* from sq88 to file */
-#define R88(s)      ((s) >> 4)                    /* from sq88 to rank */
+#define SQ_FILEMASK (007)                         /* warning, octal */
+#define SQ_RANKMASK (070)
 
-#define SETF88(s, r) ((s) &= 0xf0, (s) |= (r))
-#define SETR88(s, f) ((s) &= 0x0f, (s) |= (f)<<4)
 
-#define SQ88_NOK(s)  ((s) & 0x88)                 /* invalid square */
-#define SQ88_OK(s)   (!SQ88_NOK(s))
-
-/* definitions for bitboard representation
+/* flip a 0-63 square:
+ * Vertical:   G8 (62) becomes G1 (6)
+ * Horizontal: G8 (62) becomes B8 (57)
  */
-#define BB(f, r)     (1ULL << (8 * (r) + (f)))    /* from rank,file to bitboard */
-#define SQ88_2_BB(s) (BB(F88(s), R88(s)))         /* from sq88 to bitboard */
-#define FILEBB(b)    ((b) % 8)                    /* from sq88 to file */
-#define RANKBB(b)    ((b) / 8)                    /* from sq88 to rank */
+#define FLIP_V(sq)      ((sq) ^ 56)
+#define FLIP_H(sq)      ((sq) ^ 7)
+#define FLIP_HV(sq)     ((sq) ^ 63)               /* FLIP_V ^ FLIP_H */
 
-#define SQ88_NOK(s)  ((s) & 0x88)                 /* invalid square */
-#define SQ88_OK(s)   (!SQ88_NOK(s))
+/* TODO: revert to macros after bitboard migration */
+static __always_inline square_t sq_make(file_t file, rank_t rank)
+{
+    return (rank << 3) + file;
+}
+static __always_inline file_t sq_file(square_t square)
+{
+    return square & SQ_FILEMASK;
+}
+static __always_inline rank_t sq_rank(square_t square)
+{
+    return square >> 3;
+}
 
-/* piece human notation
+#define sq_ok(sq)       ((sq) >= A1 && (sq) <= H8)
+#define sq_coord_ok(c)  ((c) >= 0 && (c) < 8)
+
+/**
+ * sq_dist() - Chebyshev (king) distance between two squares (macro).
+ * @sq1, @sq2: The two squares.
+ *
+ * See: https://www.chessprogramming.org/Distance
+ * Distance is max( |r2 - r1|, |f2 - f1| )
+ *
+ * @Return: the Chebyshev distance.
  */
-#define CHAR_EMPTY   ' '
-#define CHAR_PAWN    'P'
-#define CHAR_KNIGHT  'N'
-#define CHAR_BISHOP  'B'
-#define CHAR_ROOK    'R'
-#define CHAR_QUEEN   'Q'
-#define CHAR_KING    'K'
+#define sq_dist(sq1, sq2) (max(abs(sq_file(sq2) - sq_file(sq1)),  \
+                               abs(sq_rank(sq2) - sq_rank(sq1))))
 
-/* from human to machine
+/**
+ * sq_taxi() - Manhattan (taxi) distance between two squares (macro).
+ * @sq1, @sq2: The two squares.
+ *
+ * See: https://www.chessprogramming.org/Distance
+ * Distance is |r2 - r1| + |f2 - f1|.
+ *
+ * @Return: the Manhattan distance.
  */
-#define C2FILE(c)    (tolower(c) - 'a')
-#define C2RANK(c)    (tolower(c) - '1')
-/* from machine to human
- */
-#define FILE2C(f)    ((f) + 'a')
-#define RANK2C(r)    ((r) + '1')
+#define sq_taxi(sq1, sq2) (abs(sq_file(sq2) - sq_file(sq1)) +     \
+                           abs(sq_rank(sq2) - sq_rank(sq1)))
 
-enum x88_square {
-    x88_A1=0x00, x88_B1, x88_C1, x88_D1, x88_E1, x88_F1, x88_G1, x88_H1,
-    x88_A2=0x10, x88_B2, x88_C2, x88_D2, x88_E2, x88_F2, x88_G2, x88_H2,
-    x88_A3=0x20, x88_B3, x88_C3, x88_D3, x88_E3, x88_F3, x88_G3, x88_H3,
-    x88_A4=0x30, x88_B4, x88_C4, x88_D4, x88_E4, x88_F4, x88_G4, x88_H4,
-    x88_A5=0x40, x88_B5, x88_C5, x88_D5, x88_E5, x88_F5, x88_G5, x88_H5,
-    x88_A6=0x50, x88_B6, x88_C6, x88_D6, x88_E6, x88_F6, x88_G6, x88_H6,
-    x88_A7=0x60, x88_B7, x88_C7, x88_D7, x88_E7, x88_F7, x88_G7, x88_H7,
-    x88_A8=0x70, x88_B8, x88_C8, x88_D8, x88_E8, x88_F8, x88_G8, x88_H8,
-};
+extern const char *sq_to_string(const square_t sq);
+extern square_t sq_from_string(const char *sq_string);
 
-#endif  /* BOARD_H */
+extern void board_print(const piece_t *board);
+extern void board_print_mask(const piece_t *board, const bitboard_t mask);
+extern void board_print_raw(const piece_t *board, const int type);
+
+#endif  /* _BOARD_H */

src/brchess.c

@@ -18,7 +18,7 @@
 #include <readline/readline.h>
 #include <readline/history.h>
 
-#include <br.h>
+#include <brlib.h>
 #include <list.h>
 #include <debug.h>
 

src/brchess.h

@@ -1,6 +1,6 @@
-/* bodichess.h - main loop.
+/* brchess.h - main loop.
  *
- * Copyright (C) 2021 Bruno Raoult ("br")
+ * Copyright (C) 2021-2024 Bruno Raoult ("br")
  * Licensed under the GNU General Public License v3.0 or later.
  * Some rights reserved. See COPYING.
  *

src/chessdefs.h

@@ -1,6 +1,6 @@
-/* chessdefs.h - generic chess definitions.
+/* chessdefs.h - generic/catchall chess definitions.
  *
- * Copyright (C) 2021 Bruno Raoult ("br")
+ * Copyright (C) 2021-2024 Bruno Raoult ("br")
  * Licensed under the GNU General Public License v3.0 or later.
  * Some rights reserved. See COPYING.
  *
@@ -11,98 +11,70 @@
  *
  */
 
-#ifndef CHESSDEFS_H
-#define CHESSDEFS_H
+#ifndef _CHESSDEFS_H
+#define _CHESSDEFS_H
 
-#include <bits.h>
+#include "brlib.h"                                /* brlib types */
 
-/* piece_t bits structure
- * MSB 8 7 6 5 4 3 2 1 LSB
- * 1: color (0 for white)
- * 2-7: bit set for pawn (2), knight, bishop, rook, queen, king (7)
+#define ONE                1ull
+#define C64(const_u64)     const_u64##ULL
+#define mask(i)            ( (u64) (ONE << (i)) )
+
+#define BOARDSIZE          (8*8)
+
+/**
+ * sq_rel - get relative square
+ * @sq: white point of view square
+ * @c:  color
+ *
+ * Get relative (mirrored if @c is BLACK) square.
+ * Example: sq_rel(A1, WHITE) = A1, sq_rel(B2, BLACK) = B7
+ *
+ * @return: Relative square.
  */
-typedef u8 piece_t;
+#define sq_rel(sq, c)      ((square_t)((sq) ^ (56 * (c))))
 
-enum {
-    E_EMPTY = 0,
-    E_COLOR,                                      /* LSB */
-    E_PAWN,
-    E_KNIGHT,
-    E_BISHOP,
-    E_ROOK,
-    E_QUEEN,
-    E_KING,
-};
-
-/* pos_t bitboards tables
+/**
+ * sq_rel_rank - get relative rank
+ * @rank: white point of view rank
+ * @c:  color
+ *
+ * Get relative (mirrored if @c is BLACK) rank.
+ * Example: sq_rel(RANK_2, WHITE) = RANK_2, sq_rel(RANK_6, BLACK) = RANK_3
+ *
+ * @return: Relative rank.
  */
-enum {
-    BB_ALL = 0,                                   /* OR of all bitboards */
-    BB_UNUSED,                                    /* future use ? */
-    BB_PAWN = E_PAWN,
-    BB_KNIGHT,
-    BB_BISHOP,
-    BB_ROOK,
-    BB_QUEEN,
-    BB_KING,
-    BB_END
-};
-
-/* piece bitmask in piece_t
- */
-enum {
-    EMPTY  = 0,
-    PAWN   = 1 << (E_PAWN - 1),                   /* 1<<(2-1) = 0x02 00000010 */
-    KNIGHT = 1 << (E_KNIGHT - 1),                 /* 0x04 00000100 */
-    BISHOP = 1 << (E_BISHOP - 1),                 /* 0x08 00001000 */
-    ROOK   = 1 << (E_ROOK - 1),                   /* 0x10 00010000 */
-    QUEEN  = 1 << (E_QUEEN - 1),                  /* 0x20 00100000 */
-    KING   = 1 << (E_KING - 1),                   /* 0x40 01000000 */
-};
-
-#define PIECETOBB(p)    (ffs64(PIECE(p)))         /* from piece_t to bb piece array */
-
-#define WHITE           0                         /* 0x00 00000000 */
-#define BLACK           1                         /* 0x01 00000001 */
-#define OPPONENT(p)     !(p)
-
-#define MASK_COLOR      0x01                      /* 00000001 */
-#define MASK_PIECE      0x7E                      /* 01111110 */
-
-#define COLOR(p)        ((p) & MASK_COLOR)        /* bitmask */
-#define PIECE(p)        ((p) & MASK_PIECE)
-#define E_PIECE(p)      (ffs64(PIECE(p)))         /* convert mask to E_XX */
-
-#define IS_WHITE(p)     (!COLOR(p))
-#define IS_BLACK(p)     (COLOR(p))
-
-#define SET_WHITE(p)    ((p) &= ~MASK_COLOR)
-#define SET_BLACK(p)    ((p) |= MASK_COLOR)
-#define SET_COLOR(p, c) (!(c)? SET_WHITE(p): SET_BLACK(p))
-
-/* flip a 0-63 square:
- * Vertical:   G8 (62) becomes G1 (6)
- * Horizontal: G8 (62) becomes B8 (57)
- */
-#define FLIP_V(sq)      ((sq) ^ 56)
-#define FLIP_H(sq)      ((sq) ^ 7)
-/* square_t bits structure : rrrrffff
- * ffff: file
- * rrrr: rank
- */
-typedef unsigned char square_t;
+#define sq_rel_rank(rank, c)  ((rank_t)((7 * (c)) ^ rank))
+#define sq_rel_file(file, c)  ((file_t)((7 * (c)) ^ file))
 
 /* castle_t bits structure
  */
-typedef unsigned char castle_t;
+typedef enum {
+    CASTLE_WK = (1 << 0),                         /* 0x01 00000001 */
+    CASTLE_WQ = (1 << 1),                         /* 0x02 00000010 */
+    CASTLE_BK = (1 << 2),                         /* 0x04 00000100 */
+    CASTLE_BQ = (1 << 3),                         /* 0x08 00001000 */
 
-#define CASTLE_WK       (1 << 0)                  /* 0x01 00000001 */
-#define CASTLE_WQ       (1 << 1)                  /* 0x02 00000010 */
-#define CASTLE_BK       (1 << 2)                  /* 0x04 00000100 */
-#define CASTLE_BQ       (1 << 3)                  /* 0x08 00001000 */
+    CASTLE_W  = (CASTLE_WK | CASTLE_WQ),          /* 00000011 W castle mask */
+    CASTLE_B  = (CASTLE_BK | CASTLE_BQ),          /* 00001100 B castle mask */
 
-#define CASTLE_W        (CASTLE_WK | CASTLE_WQ)   /* 00000011 W castle mask */
-#define CASTLE_B        (CASTLE_BK | CASTLE_BQ)   /* 00001100 B castle mask */
+    CASTLE_K  = (1 << 0),                         /* generic K/Q, bits 0 and 1 */
+    CASTLE_Q  = (1 << 1),
+    CASTLE_KQ = (CASTLE_K |CASTLE_Q)
+} castle_rights_t;
+
+/* determine is oo or ooo is possible with castle flags f and color c
+ */
+//#define NORM_CASTLE(f, c)  ((f) >> (2 * (c)))      /* shift  flags to bits 0/1 */
+//#define
+//(NORM_CASTLE(f, c) & CASTLE_Q)
+#define can_oo(f, c)     ((f) & (CASTLE_K  << ((c) * 2)))
+#define can_ooo(f, c)    ((f) & (CASTLE_Q  << ((c) * 2)))
+#define can_castle(f, c) ((f) & (CASTLE_KQ << ((c) * 2)))
+
+#define clr_oo(f, c)     ((f) & ~(CASTLE_K  << (2 * (c))))
+#define clr_ooo(f, c)    ((f) & ~(CASTLE_Q  << (2 * (c))))
+#define clr_castle(f, c) ((f) & ~(CASTLE_KQ << (2 * (c)) ))
 
 /* game phases
  */
@@ -110,20 +82,93 @@ typedef unsigned char castle_t;
 #define MIDDLEGAME 1
 #define ENDGAME    2
 
-/* bitboard
+/* forward defs */
+typedef struct __pos_s pos_t;
+typedef struct __movelist_s movelist_t;
+
+/* basic types
  */
 typedef u64 bitboard_t;
 
-
 /* eval type
  */
-typedef s32 eval_t;
+//typedef s32 eval_t;
 
-/* forward typedefs
+/* forward enum definition is impossible in C11, to simplify
+ * cross-dependancies, all important enum are moved here.
  */
-typedef struct piece_list_s piece_list_t;
-typedef struct board_s board_t;
-typedef struct pos_s pos_t;
-typedef struct move_s move_t;
+typedef enum {
+    _SSQUARE_ = -1,                               /* force signed enum */
+    A1 = 0, B1, C1, D1, E1, F1, G1, H1,
+    A2,     B2, C2, D2, E2, F2, G2, H2,
+    A3,     B3, C3, D3, E3, F3, G3, H3,
+    A4,     B4, C4, D4, E4, F4, G4, H4,
+    A5,     B5, C5, D5, E5, F5, G5, H5,
+    A6,     B6, C6, D6, E6, F6, G6, H6,
+    A7,     B7, C7, D7, E7, F7, G7, H7,
+    A8,     B8, C8, D8, E8, F8, G8, H8,
+    SQUARE_MAX = 64,
+    SQUARE_NONE = 64
+} square_t;
 
-#endif
+typedef enum {
+    _SFILE_ = -1,                                 /* force signed enum */
+    FILE_A = 0, FILE_B, FILE_C, FILE_D, FILE_E, FILE_F, FILE_G, FILE_H,
+    FILE_MAX,
+} file_t;
+
+typedef enum {
+    _SRANK_ = -1,                                 /* force signed enum */
+    RANK_1 = 0, RANK_2, RANK_3, RANK_4, RANK_5, RANK_6, RANK_7, RANK_8,
+    RANK_MAX,
+} rank_t;
+
+typedef enum {
+    NORTH = 8,
+    EAST =  1,
+    SOUTH = -NORTH,
+    WEST = -EAST,
+
+    NORTH_EAST = (NORTH + EAST),
+    SOUTH_EAST = (SOUTH + EAST),
+    SOUTH_WEST = (SOUTH + WEST),
+    NORTH_WEST = (NORTH + WEST),
+} dir_t;
+
+/* define diff for relative squares */
+#define sq_up(c)          ((c) == WHITE ? NORTH: SOUTH)
+#define sq_upleft(c)      ((c) == WHITE ? NORTH_WEST: SOUTH_EAST)
+#define sq_upright(c)     ((c) == WHITE ? NORTH_EAST: SOUTH_WEST)
+
+#include <time.h>
+
+typedef struct mclock {
+    clockid_t clocktype;
+    ulong elapsed_l;
+    double elapsed_f;
+    struct timespec start;
+} mclock_t;
+
+#define CLOCK_WALL    CLOCK_REALTIME
+#define CLOCK_SYSTEM  CLOCK_MONOTONIC_RAW
+#define CLOCK_PROCESS CLOCK_PROCESS_CPUTIME_ID
+#define CLOCK_THREAD  CLOCK_THREAD_CPUTIME_ID
+
+/**
+ * CLOCK_DEFINE - define a clock type.
+ * @name: clock name
+ * @type: clock type
+ *
+ * This macro is equivalent to:
+ *   mclock_t name;
+ *   clock_init(&name, type);
+ */
+#define CLOCK_DEFINE(name, type) struct mclock name = { .clocktype = type }
+
+void clock_init(mclock_t *clock, clockid_t type);
+void clock_start(mclock_t *clock);
+s64 clock_elapsed_μs(mclock_t *clock);
+s64 clock_elapsed_ms(mclock_t *clock);
+double clock_elapsed_sec(mclock_t *clock);
+
+#endif  /* _CHESSDEFS_H */

src/eval-simple.c

@@ -11,8 +11,8 @@
  *
  */
 
-#include <bits.h>
-#include <debug.h>
+#include "br.h"
+#include "debug.h"
 
 #include "piece.h"
 #include "eval-simple.h"
@@ -179,7 +179,7 @@ eval_t eval_simple(pos_t *pos)
 #           endif
 
             eval[color] += popcount64(pos->bb[color][bb]) * P_LETTER(piece);
-            bit_for_each64_2(cur, _t, pos->bb[color][bb]) {
+            bit_for_each64(cur, _t, pos->bb[color][bb]) {
 #               ifdef DEBUG_EVAL
                 log(5, "sq=%d:%d ", cur, gg[color][bb][cur]);
 #               endif

src/fen.c

@@ -1,6 +1,6 @@
-/* fen.c - fen notation.
+/* fen.c - fen parsing/generation/test.
  *
- * Copyright (C) 2021 Bruno Raoult ("br")
+ * Copyright (C) 2021-2024 Bruno Raoult ("br")
  * Licensed under the GNU General Public License v3.0 or later.
  * Some rights reserved. See COPYING.
  *
@@ -18,158 +18,331 @@
 #include <ctype.h>
 
 #include <debug.h>
+#include <bug.h>
 
 #include "chessdefs.h"
+#include "util.h"
+//#include "piece.h"
+//#include "bitboard.h"
 #include "position.h"
-#include "board.h"
 #include "fen.h"
-#include "piece.h"
 
-/* Starting Position :
- * rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
- * After 1.e4 :
- * rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq e3 0 1
- * After 1... c5 :
- * rnbqkbnr/pp1ppppp/8/2p5/4P3/8/PPPP1PPP/RNBQKBNR w KQkq c6 0 2
- * After 2. Nf3:
- * rnbqkbnr/pp1ppppp/8/2p5/4P3/5N2/PPPP1PPP/RNBQKB1R b KQkq - 1 2
- *
- * 1 : White uppercase
+/* FEN description:
+ * 1 : pieces on board (no space allowed):
+ *   - rank 8 first, '/' between ranks
+ *   - piece is usual piece notation(PNBRQK), black lowercase.
+ *   - empty: number of consecutive empty squares (digit)
  * 2 : next move (w or b)
  * 3 : Castling capabilities: "-" if none, KQ/kq if white/black can castle
  *     on K or Q side
- * 4 : en-passant: if pawn just moved 2 squares, indicate target square (e.g.
- *     for e2-e4 this field is e3)
+ * 4 : en-passant: "-" if none. If pawn just moved 2 squares, indicate target
+ *     en-passant square (e.g. for e2-e4 this field is e3)
  * 5 : half moves since last capture or pawn advance (for 50 moves rule)
  * 6 : full moves, starts at 1, increments after black move
  *
+ * Examples:
+ *
+ * starting position:
+ * rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
+ * after 1.e4 e6 2.e5 d5
+ * rnbqkbnr/ppp2ppp/4p3/3pP3/8/8/PPPP1PPP/RNBQKBNR w KQkq d6 0 3
+ * 3.Nc3 Nc6 4.Rb1 Rb8 5.Nf3 h5 6.Be2
+ * 1rbqkbnr/ppp2pp1/2n1p3/3pP2p/8/2N2N2/PPPPBPPP/1RBQK2R b Kk - 1 6
+ * 6...Be7
+ * 1rbqk1nr/ppp1bpp1/2n1p3/3pP2p/8/2N2N2/PPPPBPPP/1RBQK2R w Kk - 2 7
+ * 7.Nxd5 h4 8.g4
+ * 1rbqk1nr/ppp1bpp1/2n1p3/3NP3/6Pp/5N2/PPPPBP1P/1RBQK2R b Kk g3 0 8
  */
 
-// warning, we expect a valid fen input
-pos_t *fen2pos(pos_t *pos, char *fen)
+/*  chess startup position FEN */
+const char *startfen="rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
+static const char *castle_str = "KQkq";
+
+#define SKIP_BLANK(p) for(;isspace(*(p)); (p)++)
+
+/**
+ * fen_check(pos_t *pos) - test (and try to fix) fen-generated position.
+ * @pos: position
+ *
+ * Test and fix the following:
+ * - inconsistent castle flags (if K & R are not in correct position)
+ * - inconsistent en-passant square (turn, bad pawn position)
+ *
+ * pos_check() is also called, leading to fatal errors if something is wrong.
+ *
+ * @return: 0 if OK, 1 if OK after fix, -1 if fatal issue.
+ */
+static int fen_check(pos_t *pos)
 {
-    char *p = fen;
-    short rank, file, skip, color, bbpiece;
-    piece_t piece;
-    board_t *board = pos->board;
-#   define SKIP_BLANK(p) for(;*(p) == ' '; (p)++)
+    char *colstr[2] = { "white", "black"};
+    int warning = 0;
 
-    pos_clear(pos);
-    /* 1) get piece placement information
-     */
-    for (rank = 7, file = 0; *p && *p != ' '; ++p) {
-        color = isupper(*p)? WHITE: BLACK;
-        char cp = toupper(*p);
-        switch (cp) {
-            case CHAR_PAWN:
-                bbpiece = BB_PAWN;
-                piece = PAWN;
-                goto set_square;
-            case CHAR_KNIGHT:
-                bbpiece = BB_KNIGHT;
-                piece = KNIGHT;
-                goto set_square;
-            case CHAR_BISHOP:
-                bbpiece = BB_BISHOP;
-                piece = BISHOP;
-                goto set_square;
-            case CHAR_ROOK:
-                bbpiece = BB_ROOK;
-                piece = ROOK;
-                goto set_square;
-            case CHAR_QUEEN:
-                bbpiece = BB_QUEEN;
-                piece = QUEEN;
-                goto set_square;
-            case CHAR_KING:
-                bbpiece = BB_KING;
-                piece = KING;
-                //pos->bb[color][BB_KING] = BB(file, rank);
-                //goto set_square;
-            set_square:
-#               ifdef DEBUG_FEN
-                log_i(5, "f=%d r=%d *p=%c piece=%c color=%d\n",
-                      file, rank, *p, cp, color);
-#               endif
-                pos->bb[color][bbpiece] |= BB(file, rank);
-                pos->occupied[color] |= BB(file, rank);
-                SET_COLOR(piece, color);
-                board[SQ88(file, rank)].piece = piece;
-                board[SQ88(file, rank)].s_piece =
-                    piece_add(pos, piece, SQ88(file, rank));
-                file++;
-                break;
-            case '/':
-                rank--;
-                file = 0;
-                break;
-            default:
-                skip = cp - '0';
-                while (skip--) {
-                    board[SQ88(file++, rank)].piece = EMPTY;
-                }
+    /* en passant, depends on who plays next */
+    if (pos->en_passant != SQUARE_NONE) {
+        rank_t eprank = sq_rank(pos->en_passant);
+        file_t epfile = sq_file(pos->en_passant);
+        rank_t rank5 = sq_rel_rank(RANK_5, pos->turn);
+        rank_t rank6 = sq_rel_rank(RANK_6, pos->turn);
+        rank_t rank7 = sq_rel_rank(RANK_7, pos->turn);
+        piece_t pawn = pos->turn == WHITE? B_PAWN: W_PAWN;
+        if (warn(eprank != rank6 ||
+                 pos->board[sq_make(epfile, rank5)] != pawn ||
+                 pos->board[sq_make(epfile, rank6)] != EMPTY ||
+                 pos->board[sq_make(epfile, rank7)] != EMPTY,
+                 "fen warn: wrong en-passant settings. (fixed)\n")) {
+#           ifdef DEBUG_FEN
+            printf("ep5=%o ep6=%o ep7=%o\n", sq_make(epfile, rank5),
+                   sq_make(epfile, rank6), sq_make(epfile, rank7));
+#           endif
+            warning++;
+            pos->en_passant = SQUARE_NONE;
         }
     }
-#   ifdef DEBUG_FEN
-    for (rank = 7; rank >= 0; --rank) {
-        for (file = 0; file < 8; ++file) {
-            log(5, "%02x ", board[SQ88(file, rank)].piece);
+
+    for (int color = WHITE; color <= BLACK; ++color) {
+        rank_t rank1 = color == WHITE? RANK_1: RANK_8;
+
+        /* castling */
+        /* where K and R should be for valid castle flag */
+        bitboard_t k    = bb_sq[sq_make(FILE_E, rank1)];
+        bitboard_t r_k  = bb_sq[sq_make(FILE_H, rank1)];
+        bitboard_t r_q  = bb_sq[sq_make(FILE_A, rank1)];
+
+       /* where they are */
+        bitboard_t kings = pos->bb[color][KING];
+        bitboard_t rooks = pos->bb[color][ROOK];
+        castle_rights_t castle_k = color == WHITE? CASTLE_WK: CASTLE_BK;
+        castle_rights_t castle_q = color == WHITE? CASTLE_WQ: CASTLE_BQ;
+        if (pos->castle & castle_k) {
+            if (warn(!(k & kings && r_k & rooks),
+                     "fen warn: wrong %s short castling K or R position (fixed)\n",
+                     colstr[color])) {
+                warning++;
+                pos->castle &= ~castle_k;
+            }
         }
-        log(5, "\n");
-    }
-#   endif
-
-    /* 2) next move color
-     */
-    SKIP_BLANK(p);
-    SET_COLOR(pos->turn, *p == 'w' ? WHITE : BLACK);
-    p++;
-
-    /* 3) castle status
-     */
-    SKIP_BLANK(p);
-    pos->castle = 0;
-    if (*p != '-') {
-        for (; *p && *p != ' '; ++p) {
-            switch (*p) {
-                case 'K':
-                    pos->castle |= CASTLE_WK;
-                    break;
-                case 'k':
-                    pos->castle |= CASTLE_BK;
-                    break;
-                case 'Q':
-                    pos->castle |= CASTLE_WQ;
-                    break;
-                case 'q':
-                    pos->castle |= CASTLE_BQ;
-                    break;
+        if (pos->castle & castle_q) {
+            if (warn(!(k & kings && r_q & rooks),
+                     "fen warn: wrong %s long castling K or R position (fixed)\n",
+                     colstr[color])) {
+                warning++;
+                pos->castle &= ~castle_q;
             }
         }
     }
-    p++;
+    return pos_ok(pos, 0) ? warning: -1;
+}
+
+/**
+ * startpos - create a game start position
+ * @pos: a position pointer or NULL
+ *
+ * See @fen2pos function.
+ *
+ * @return: the pos position.
+ */
+pos_t *startpos(pos_t *pos)
+{
+    return fen2pos(pos, startfen);
+}
+
+/**
+ * fen2pos - make a position from a fen string
+ * @pos: a position pointer or NULL
+ * @fen: a valid fen string
+ *
+ * If @pos is NULL, a position will be allocated with @pos_new(),
+ * that should be freed by caller.
+ *
+ * @return: the pos position, or NULL if error.
+ */
+pos_t *fen2pos(pos_t *pos, const char *fen)
+{
+    const char *cur = fen;
+    char *p;
+    short rank, file, tmp;
+    piece_t piece;
+    int consumed, err_line = 0, err_pos, err_char;
+    pos_t tmppos;
+
+    pos_clear(&tmppos);
+    /* 1) get piece placement information
+     */
+    for (rank = 7, file = 0; *cur && !isspace(*cur); ++cur) {
+        if (*cur == '/') {                        /* next rank */
+            rank--;
+            file = 0;
+            continue;
+        }
+        if (isdigit(*cur)) {                      /* empty square(s) */
+            file += *cur - '0';
+            continue;
+        }
+        if ((piece = piece_from_fen(*cur)) != EMPTY) {
+#           ifdef DEBUG_FEN
+            printf("f=%d r=%d *p=%c piece=%#04x t=%d c=%d\n", file, rank, *cur,
+                  piece, PIECE(piece), COLOR(piece));
+#           endif
+            pos_set_sq(&tmppos, sq_make(file, rank), piece);
+            file++;
+        } else {                                  /* error */
+            err_line = __LINE__, err_char = *cur, err_pos = cur - fen;
+            goto end;
+        }
+    }
+    SKIP_BLANK(cur);
+
+    /* 2) next turn color
+     */
+    tmppos.turn = *cur++ == 'w' ? WHITE : BLACK;
+    SKIP_BLANK(cur);
+
+    /* 3) castle rights
+     */
+    if (*cur == '-') {
+        cur++;
+    } else {
+        for (; *cur && !isspace(*cur); ++cur) {
+            if ((p = strchr(castle_str, *cur))) { /* valid castle letter */
+                tmppos.castle |= 1 << (p - castle_str);
+            } else {
+                err_line = __LINE__, err_char = *cur, err_pos = cur - fen;
+                goto end;
+            }
+        }
+    }
+    SKIP_BLANK(cur);
 
     /* 4) en passant
      */
-    SKIP_BLANK(p);
-    pos->en_passant = 0;
-    if (*p != '-') {
-        //SET_F(pos->en_passant, C2FILE(*p++));
-        //SET_R(pos->en_passant, C2RANK(*p++));
-        pos->en_passant = SQ88(C2FILE(*p), C2RANK(*(p+1)));
-        pos += 2;
+    if (*cur == '-') {
+        cur++;
     } else {
-        p++;
+        tmppos.en_passant = sq_from_string(cur);
+        cur += 2;
     }
+    SKIP_BLANK(cur);
 
-    /* 5) half moves since last capture or pawn move and
-     * 6) current move number
+    /* 5) half moves since last capture or pawn move (50 moves rule)
      */
-    SKIP_BLANK(p);
-    //log_i(5, "pos=%d\n", (int)(p-fen));
-    sscanf(p, "%hd %hd", &pos->clock_50, &pos->curmove);
+    tmppos.clock_50 = 0;
+    tmppos.plycount = 1;
+    if (sscanf(cur, "%hd%n", &tmp, &consumed) != 1)
+        goto end;                                 /* early end, ignore w/o err */
+
+    tmppos.clock_50 = tmp;
+    cur += consumed;
+    SKIP_BLANK(cur);
+
+    /* 6) current full move number, starting with 1
+     */
+    if (sscanf(cur, "%hd", &tmp) != 1)
+        goto end;
+    if (tmp <= 0)                                 /* fix faulty numbers*/
+        tmp = 1;
+    tmp = 2 * (tmp - 1) + (tmppos.turn == BLACK); /* plies, +1 if black turn */
+    tmppos.plycount = tmp;
+
+end:
+    if (warn(err_line, "FEN error line %d: charpos=%d char=%#x(%c)\n",
+             err_line, err_pos, err_char, err_char)) {
+        return NULL;
+    }
+    if (fen_check(&tmppos) < 0)
+        return NULL;
+    if (!pos)
+        pos = pos_dup(&tmppos);
+    //puts("prout 1");
+    //pos_print_raw(&tmppos, 1);
+    //puts("prout 2");
 #   ifdef DEBUG_FEN
-    log_i(5, "50 rule=%d current move=%d\n", pos->clock_50, pos->curmove);
+    pos_print_raw(&tmppos, 1);
 #   endif
+
     return pos;
 }
+
+/**
+ * pos2fen - make a FEN string from a position.
+ * @pos: a position pointer
+ * @fen: destination FEN char*, or NULL
+ *
+ * If @fen is NULL, a 92 bytes memory will be allocated with malloc(1),
+ * that should be freed by caller.
+ *
+ * Note: If @fen is given, no check is done on its length, but to
+ * be on secure side, it should be at least 90 bytes. See:
+ * https://chess.stackexchange.com/questions/30004/longest-possible-fen
+ * For convenience, use FENSTRLEN.
+ *
+ * @return: the pos position, or NULL if error.
+ */
+char *pos2fen(const pos_t *pos, char *fen)
+{
+    int cur = 0;
+
+    if (!fen)
+        fen = safe_malloc(92);
+
+    /*  1) position
+     */
+    for (rank_t r = RANK_8; r >= RANK_1; --r) {
+        for (file_t f = FILE_A; f <= FILE_H;) {
+            square_t sq = sq_make(f, r);
+            piece_t piece = pos->board[sq];
+#           ifdef DEBUG_FEN
+            printf("r=%d f=%d p=%d pos=%d\n", r, f, piece, cur);
+#           endif
+            if (piece == EMPTY) {
+                int len = 0;
+                for (; f <= FILE_H && pos->board[sq_make(f, r)] == EMPTY; f++)
+                    len++;
+#               ifdef DEBUG_FEN
+                printf("empty=%d char=%c\n", len, '0' + len);
+#               endif
+                fen[cur++] = '0' + len;
+            } else {
+                fen[cur++] = *piece_to_fen(piece);
+#               ifdef DEBUG_FEN
+                printf("f1=%d r=%d c=%c t=%d c=%d \n", f, r,
+                       *(piece_to_fen(piece)), PIECE(piece), COLOR(piece));
+#               endif
+                f++;
+            }
+        }
+        fen[cur++] = r == RANK_1? ' ': '/';
+    }
+
+    /* 2) next turn color
+     */
+    fen[cur++] = pos->turn == WHITE? 'w': 'b';
+    fen[cur++] = ' ';
+
+    /*  3) castle rights
+     */
+    if (pos->castle == 0) {
+        fen[cur++] = '-';
+    } else {
+        for (int i = 0; i < 4; ++i)
+            if (pos->castle & mask(i))
+                fen[cur++] = castle_str[i];
+    }
+    fen[cur++] = ' ';
+
+    /* 4) en passant
+     */
+    if (pos->en_passant == SQUARE_NONE) {
+        fen[cur++] = '-';
+    } else {
+        fen[cur++] = FILE2C(sq_file(pos->en_passant));
+        fen[cur++] = RANK2C(sq_rank(pos->en_passant));
+    }
+    fen[cur++] = ' ';
+
+    /* 5) moves since last capture or pawn move (50 moves rule)
+     * 6) current full move number, starting with 1
+     */
+    sprintf(fen+cur, "%d %d", pos->clock_50,
+            1 + (pos->plycount - (pos->turn == BLACK)) / 2);
+    return fen;
+}

src/fen.h

@@ -1,6 +1,6 @@
 /* fen.h - fen notation.
  *
- * Copyright (C) 2021 Bruno Raoult ("br")
+ * Copyright (C) 2021-2024 Bruno Raoult ("br")
  * Licensed under the GNU General Public License v3.0 or later.
  * Some rights reserved. See COPYING.
  *
@@ -14,8 +14,14 @@
 #ifndef FEN_H
 #define FEN_H
 
-#include "position.h"
+#include "chessdefs.h"
 
-pos_t *fen2pos(pos_t *pos, char *fen);
+#define FENSTRLEN 92                              /* secure FEN string size */
+
+extern const char *startfen;                      /* startup position */
+
+extern pos_t *startpos(pos_t *pos);
+extern pos_t *fen2pos(pos_t *pos, const char *fen);
+extern char *pos2fen(const pos_t *pos, char *fen);
 
 #endif /* FEN_H */

src/hyperbola-quintessence.c

@@ -0,0 +1,210 @@
+/* hyperbola-quintessence.c - hyperbola quintessence functions.
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "brlib.h"
+
+#include "chessdefs.h"
+#include "board.h"
+#include "bitboard.h"
+#include "hyperbola-quintessence.h"
+
+
+uchar bb_rank_attacks[64 * 8];
+
+/**
+ * hyperbola_init() - init hyperbola quintessence attack bitboards
+ *
+ * See: https://www.chessprogramming.org/Kindergarten_Bitboards
+ * and  https://www.chessprogramming.org/Hyperbola_Quintessence
+ *
+ *
+ * Rank attacks table:
+ * bb_rank_hyperbola[512 = 9 bits], indexed by oooooofff where:
+ *   - O = oooooo: occupation of inner 6 bits on rank
+ *   - F = fff:    file of sliding piece
+ * The index is built as (oooooo << 3 + fff), = ((O << 3) + F), where:
+ *   - O = all combinations of 6 bits (loop from 0 to 64)
+ *   - F = all files (loop from 0 to 7)
+ * To retrieve the index, given an 8 bits mask M=XooooooX, and a file F=fff,
+ * we get O from M with:
+ *   1) remove bits 'X' (O = M & 01111110)
+ *   2) shift left result 2 more bits, as bit 0 is unused and already cleared:
+ *      (O <<= 2)
+ *
+ * TODO ? create masks excluding slider (eg. bb_diag ^ bb_sq[square]),
+ * to save one operation in hyperbola_moves().
+ * TODO ? replace rank attack with this idea, mapping rank to diagonal ?
+ * See http://timcooijmans.blogspot.com/2014/04/
+ */
+void hyperbola_init()
+{
+    /* generate rank attacks, not handled by HQ
+     */
+    for (int occ = 0; occ < 64; ++occ) {
+        for (int file = 0; file < 8; ++file) {
+            int attacks = 0;
+            //int o = mask << 1;                    /* skip right square */
+
+            /* set f left attacks */
+            for (int slide = file - 1; slide >= 0; --slide) {
+                int b = bb_sq[slide];             /* bit to consider */
+                attacks |= b;                     /* add to attack mask */
+                if ((occ << 1) & b)               /* piece on b, we stop */
+                    break;
+            }
+            /* set f right attacks */
+            for (int slide = file + 1; slide < 8; ++slide) {
+                int b = bb_sq[slide];
+                attacks |= b;
+                if ((occ << 1) & b)               /* piece on b, we stop */
+                    //if ((o & b) == b)
+                    break;
+            }
+            bb_rank_attacks[(occ << 3) + file] = attacks;
+
+            //if (((occ << 3) + file) == 171) {
+            //char str[64], str2[64];
+               //printf("mask=%x=%s file=%d att=%x=%s\n",
+               //       occ, bitboard_rank_sprint(str, occ), file,
+               //       attacks, bitboard_rank_sprint(str2, attacks));
+            //}
+        }
+    }
+}
+
+/**
+ * hyperbola_rank_moves() - get rank moves for a sliding piece.
+ * @pieces: occupation bitboard
+ * @sq: piece square
+ *
+ * Rank attacks are not handled by HQ, so this function uses a pre-calculated
+ * rank attacks table (@bb_rank_attacks).
+ *
+ * @Return: bitboard of @piece available pseudo-moves.
+ */
+bitboard_t hyperbola_rank_moves(bitboard_t occ, square_t sq)
+{
+    u32 rank = sq & SQ_RANKMASK;
+    u32 file = sq & SQ_FILEMASK;
+    u64 o = (occ >> rank) & 0176;                 /* 01111110 clear bits 0 & 7 */
+    //char zob[128], zob2[128];
+    //printf("rank_moves: occ=%lx=%s file=%d o=%lx=%s index=%ld=%ld attack=%lx=%s\n", occ,
+    //       bitboard_rank_sprint(zob, occ), file, o,
+    //       bitboard_rank_sprint(zob, o), (o << 2) + file, (o * 4) + file,
+    //       (bitboard_t)bb_rank_attacks[(o << 2) + file] << rank,
+    //       bitboard_rank_sprint(zob2, (bitboard_t)bb_rank_attacks[(o << 2) + file] << rank));
+    return ((bitboard_t)bb_rank_attacks[(o << 2) + file]) << rank;
+}
+
+/**
+ * hyperbola_moves() - get hyperbola pseudo-moves for a sliding piece
+ * @pieces: occupation bitboard
+ * @sq: piece square
+ * @mask: the appropriate mask (pre-calculated)
+ *
+ * This function can be used for files, diagonal, and anti-diagonal attacks.
+ * @mask is the corresponding pre-calculated table (@bb_sqfile, @bb_sqdiag,
+ * or @bb_sqanti).
+ * See https://www.chessprogramming.org/Hyperbola_Quintessence for details.
+ *
+ * @Return: bitboard of piece available pseudo-moves.
+ */
+bitboard_t hyperbola_moves(const bitboard_t pieces, const square_t sq,
+                                   const bitboard_t mask)
+{
+    bitboard_t o = pieces & mask;
+    bitboard_t r = bswap64(o);
+    square_t  r_sq = FLIP_V(sq);
+
+    return (         (o - 2 * mask(sq)   )
+            ^ bswap64(r - 2 * mask(r_sq)))
+        & mask;
+}
+
+/**
+ * hyperbola_file_moves() - get file pseudo-moves for a sliding piece.
+ * @pieces: occupation bitboard
+ * @sq: piece square
+ *
+ * @Return: bitboard of piece available pseudo-moves on its file.
+ */
+bitboard_t hyperbola_file_moves(const bitboard_t occ, const square_t sq)
+{
+    return hyperbola_moves(occ, sq, bb_sqfile[sq]);
+}
+
+/**
+ * hyperbola_diag_moves() - get diagonal pseudo-moves for a sliding piece.
+ * @pieces: occupation bitboard
+ * @sq: piece square
+ *
+ * @Return: bitboard of piece available pseudo-moves on its diagonal.
+ */
+bitboard_t hyperbola_diag_moves(const bitboard_t occ, const square_t sq)
+{
+    return hyperbola_moves(occ, sq, bb_sqdiag[sq]);
+}
+
+/**
+ * hyperbola_anti_moves() - get anti-diagonal pseudo-moves for a sliding piece.
+ * @pieces: occupation bitboard
+ * @sq: piece square
+ *
+ * @Return: bitboard of piece available pseudo-moves on its anti-diagonal.
+ */
+bitboard_t hyperbola_anti_moves(const bitboard_t occ, const square_t sq)
+{
+    return hyperbola_moves(occ, sq, bb_sqanti[sq]);
+}
+
+/**
+ * hyperbola_bishop_moves() - get bitboard of bishop pseudo-moves
+ * @occ: occupation bitboard
+ * @sq: bishop square
+ *
+ * @Return: bitboard of bishop available pseudo-moves.
+ */
+bitboard_t hyperbola_bishop_moves(const bitboard_t occ, const square_t sq)
+{
+    return hyperbola_diag_moves(occ, sq) | hyperbola_anti_moves(occ, sq);
+}
+
+/**
+ * hyperbola_rook_moves() - get bitboard of rook pseudo-moves
+ * @occ: occupation bitboard
+ * @sq: rook square
+ *
+ * @Return: bitboard of rook available pseudo-moves.
+ */
+bitboard_t hyperbola_rook_moves(const bitboard_t occ, const square_t sq)
+{
+    return hyperbola_file_moves(occ, sq) | hyperbola_rank_moves(occ, sq);
+}
+
+/**
+ * hyperbola_queen_moves() - get bitboard of queen pseudo-moves
+ * @occ: occupation bitboard
+ * @sq: queen square
+ *
+ * This function is a wrapper over @hyperbola_bishop_moves() and
+ * @hyperbola_rook_moves().
+ *
+ * @Return: bitboard of queen available pseudo-moves.
+ */
+bitboard_t hyperbola_queen_moves(const bitboard_t occ, const square_t sq)
+{
+    return hyperbola_bishop_moves(occ, sq) | hyperbola_rook_moves(occ, sq);
+}

src/hyperbola-quintessence.h

@@ -0,0 +1,33 @@
+/* hyperbola-quintessence.h - hyperbola-quintessence definitions.
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#ifndef _HYPERBOLA_QUINTESSENCE_H
+#define _HYPERBOLA_QUINTESSENCE_H
+
+#include "board.h"
+#include "bitboard.h"
+
+void hyperbola_init(void);
+
+bitboard_t hyperbola_rank_moves(const bitboard_t occ, const square_t sq);
+bitboard_t hyperbola_moves(const bitboard_t pieces, const square_t sq,
+                           const bitboard_t mask);
+bitboard_t hyperbola_file_moves(const bitboard_t occ, const square_t sq);
+bitboard_t hyperbola_diag_moves(const bitboard_t occ, const square_t sq);
+bitboard_t hyperbola_anti_moves(const bitboard_t occ, const square_t sq);
+
+bitboard_t hyperbola_bishop_moves(const bitboard_t occ, const square_t sq);
+bitboard_t hyperbola_rook_moves(const bitboard_t occ, const square_t sq);
+bitboard_t hyperbola_queen_moves(const bitboard_t occ, const square_t sq);
+
+#endif  /* _HYPERBOLA_QUINTESSENCE_H */

src/misc.c

@@ -0,0 +1,112 @@
+/* misc.c - generic/catchall functions.
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <time.h>
+
+#include "chessdefs.h"
+
+/*
+ * 1 sec      = 1000 millisec
+ * 1 millisec = 1000 microsec
+ * 1 microsec = 1000 nanosec
+ * milli = sec * 1000 + nanosec / 1000000
+ *
+ */
+
+/* We use microsec for all intermediate calcluation */
+#define NANO_IN_MICRO  1000ll                     /* nanosecond in millisecond */
+#define MICRO_IN_SEC   1000000ll                  /* millisecond in second */
+
+#define MILLI_IN_SEC   1000ll                     /* millisecond in second */
+
+#define MICRO_IN_MILLI 1000ll
+
+//#define NANO_IN_MILLI  1000000ll                         /* nanosecond in millisecond */
+//#define NANO_IN_SEC    (NANOS_IN_MS * MS_IN_SEC)
+
+
+/**
+ * clock_start - start or restart a clock.
+ * @clock: &mclock_t clock
+ *
+ * Save current time according to @clock type.
+ */
+void clock_start(mclock_t *clock)
+{
+    clock_gettime(clock->clocktype, &clock->start);
+}
+
+/**
+ * clock_init - initializes a clock type.
+ * @clock: &mclock_t clock
+ * @type: clock type
+ *
+ * See the clock_gettime(2) for details.
+ * CLOCK_WALL (a.k.a CLOCK_REALTIME): Wall clock.
+ * CLOCK_SYSTEM (a.k.a CLOCK_MONOTONIC_RAW): System clock.
+ * CLOCK_PROCESS (a.k.a CLOCK_PROCESS_CPUTIME_ID): Process CPU clock (incl. threads).
+ * CLOCK_THREAD  (a.k.a CLOCK_THREAD_CPUTIME_ID): Thread CPU clock.
+ */
+void clock_init(mclock_t *clock, clockid_t type)
+{
+    clock->clocktype = type;
+    clock_start(clock);
+}
+
+/**
+ * clock_elapsed_μs - return a mclock_t elapsed time in microseconds.
+ * @clock: &mclock_t clock
+ *
+ * The elapsed time is calculated between current time and last clock_start(@clock)
+ * call time.
+ *
+ * @return: microseconds elapsed since last clock_start().
+ */
+s64 clock_elapsed_μs(mclock_t *clock)
+{
+    struct timespec current;
+    s64 μs;
+
+    clock_gettime(clock->clocktype, &current);
+    μs = ((s64)current.tv_sec - (s64)clock->start.tv_sec) * MICRO_IN_SEC +
+        ((s64)current.tv_nsec - (s64)clock->start.tv_nsec) / NANO_IN_MICRO ;
+    return μs;
+}
+
+/**
+ * clock_elapsed_ms - return a mclock_t elapsed time in milliseconds.
+ * @clock: &mclock_t clock
+ *
+ * The elapsed time is calculated between current time and last clock_start(@clock)
+ * call time.
+ *
+ * @return: milliseconds elapsed since last clock_start().
+ */
+s64 clock_elapsed_ms(mclock_t *clock)
+{
+    return clock_elapsed_μs(clock) / MICRO_IN_MILLI;
+}
+
+/**
+ * clock_elapsed_sec - return a mclock_t elapsed time in seconds.
+ * @clock: &mclock_t clock
+ *
+ * The elapsed time is calculated between current time and last clock_start(@clock)
+ * call time.
+ *
+ * @return: seconds elapsed since last clock_start().
+ */
+double clock_elapsed_sec(mclock_t *clock)
+{
+    return (double) clock_elapsed_μs(clock) / (double) MICRO_IN_SEC;
+}

src/move-do.c

@@ -0,0 +1,193 @@
+/* move-do.c - move do/undo.
+ *
+ * Copyright (C) 2021-2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <malloc.h>
+#include <ctype.h>
+#include <stdlib.h>
+
+#include "brlib.h"
+#include "likely.h"
+#include "bug.h"
+
+#include "chessdefs.h"
+#include "move.h"
+#include "position.h"
+#include "move-do.h"
+
+/**
+ * move_do() - do move.
+ * @pos:    &pos_t position
+ * @move:   move to apply
+ * @state:  &state_t address where irreversible changes will be saved
+ *
+ * @move is applied to @pos:
+ * - bitboards and board are updated
+ * - counters are updated:
+ *   - move count
+ *   - 50-moves rule count
+ * - flags are possibly updated:
+ *   - castling
+ *   - en-passant
+ * - captured piece (excl. en-passant)
+ *
+ * @return: pos.
+ */
+pos_t *move_do(pos_t *pos, const move_t move) //, state_t *state)
+{
+//#   ifdef DEBUG_MOVE_DO
+//    move_print(move, M_PR_NL | M_PR_LONG);
+//#   endif
+    //*state = pos->state;                          /* save irreversible changes */
+
+    color_t us = pos->turn, them = OPPONENT(us);
+    square_t from = move_from(move), to = move_to(move);
+    piece_t piece = pos->board[from];
+    piece_t captured = pos->board[to];
+    piece_type_t ptype = PIECE(piece);
+    color_t pcolor = COLOR(piece);
+    piece_t new_piece = piece;
+    int up = sq_up(us);
+
+    ++pos->clock_50;
+    ++pos->plycount;
+    pos->en_passant = SQUARE_NONE;
+    pos->turn = them;
+    pos->captured = captured;
+
+    bug_on(pcolor != us);
+
+    if (is_promotion(move)) {
+        bug_on(sq_rank(to) != sq_rel_rank(RANK_8, us));
+        new_piece = MAKE_PIECE(move_promoted(move), us);
+    }
+
+    if (captured != EMPTY) {
+        pos->clock_50 = 0;
+        //pos->captured = pos->board[to];           /* save capture info */
+        bug_on(pos->board[to] == EMPTY || COLOR(pos->captured) != them);
+        pos_clr_sq(pos, to);                      /* clear square */
+    } else if (is_castle(move)) {                 /* handle rook move */
+        square_t rookfrom, rookto;
+        if (is_castle_K(move)) {
+            rookfrom = sq_rel(H1, us);
+            rookto = sq_rel(F1, us);
+        } else {
+            rookfrom = sq_rel(A1, us);
+            rookto = sq_rel(D1, us);
+        }
+        pos_set_sq(pos, rookto, pos->board[rookfrom]);
+        pos_clr_sq(pos, rookfrom);
+        pos->castle = clr_castle(pos->castle, us);
+    } else if (ptype == PAWN) {                   /* pawn non capture or e.p. */
+        pos->clock_50 = 0;
+        if (is_dpush(move))                       /* if pawn double push, set e.p. */
+            pos->en_passant = from + up;
+        else if (is_enpassant(move)) {            /* clear grabbed pawn */
+            square_t grabbed = to - up;
+            pos_clr_sq(pos, grabbed);
+        }
+    }
+
+    pos_clr_sq(pos, from);                        /* always clear "from" and set "to" */
+    pos_set_sq(pos, to, new_piece);
+
+    if (ptype == KING)
+        pos->king[us] = to;
+
+    /* update castling flags
+     * As we always consider flags are valid, we :
+     * - adjust our flags if relative from is "E1", "A1", H1"
+     * - adjust opp flags if relative to   if "A8", H8"
+     */
+    if (can_castle(pos->castle, us)) {            /* do we save time with this test ? */
+        square_t rel_e1 = sq_rel(E1, us);
+        square_t rel_a1 = sq_rel(A1, us);
+        square_t rel_h1 = sq_rel(H1, us);
+        if (from == rel_e1)
+            pos->castle = clr_castle(pos->castle, us);
+        else if (from == rel_a1)
+            pos->castle = clr_ooo(pos->castle, us);
+        else if (from == rel_h1)
+            pos->castle = clr_oo(pos->castle, us);
+    }
+    if (can_castle(pos->castle, them)) {          /* do we save time with this test ? */
+        square_t rel_a8 = sq_rel(A8, us);
+        square_t rel_h8 = sq_rel(H8, us);
+        if (to == rel_a8)
+            pos->castle = clr_ooo(pos->castle, them);
+        else if (to == rel_h8)
+            pos->castle = clr_oo(pos->castle, them);
+    }
+
+    return pos;
+}
+
+/**
+ * move_undo() - undo move.
+ * @pos:    &pos_t position
+ * @move:   move to undo
+ * @state:  &state_t address where irreversible changes were saved
+ *
+ * @move is applied to @pos:
+ * - bitboards and board are updated
+ * - previous information is restored:
+ *   - castling
+ *   - en-passant
+ *   - captured piece (excl. en-passant)
+ *   - move count
+ *   - 50-moves rule count
+ *
+ * @return: pos.
+ */
+pos_t *move_undo(pos_t *pos, const move_t move)//, const state_t *state)
+{
+//#   ifdef DEBUG_MOVE
+    //log(1, "new move: ");
+    //move_print(0, move, M_PR_NL | M_PR_LONG);
+//#   endif
+    color_t them = pos->turn, us = OPPONENT(them);
+    square_t from = move_from(move), to = move_to(move);
+    piece_t piece = pos->board[to];
+    int up = sq_up(them);
+
+    if (is_promotion(move))
+        piece = MAKE_PIECE(PAWN, us);
+
+    pos_clr_sq(pos, to);                          /* always clear "to" ... */
+    pos_set_sq(pos, from, piece);                 /* ... and set "from" */
+
+    if (PIECE(piece) == KING)
+        pos->king[us] = from;
+
+    if (pos->captured != EMPTY) {
+        pos_set_sq(pos, to, pos->captured);       /* restore captured piece */
+    } else if (is_castle(move)) {                 /* make reverse rook move */
+        square_t rookfrom, rookto;
+        if (is_castle_K(move)) {
+            rookfrom = sq_rel(F1, us);
+            rookto = sq_rel(H1, us);
+        } else {
+            rookfrom = sq_rel(D1, us);
+            rookto = sq_rel(A1, us);
+        }
+        pos_set_sq(pos, rookto, pos->board[rookfrom]);
+        pos_clr_sq(pos, rookfrom);
+    } else if (is_enpassant(move)) {              /* restore grabbed pawn */
+        square_t grabbed = to + up;
+        pos_set_sq(pos, grabbed, MAKE_PIECE(PAWN, them));
+    }
+
+    //pos->state = *state;                          /* restore irreversible changes */
+    pos->turn = us;
+    return pos;
+}

src/move-do.h

@@ -0,0 +1,22 @@
+/* move-do.h - move do/undo.
+ *
+ * Copyright (C) 2021-2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#ifndef MOVE_DO_H
+#define MOVE_DO_H
+
+#include "position.h"
+
+pos_t *move_do(pos_t *pos, const move_t move);//, state_t *state);
+pos_t *move_undo(pos_t *pos, const move_t move);//, const state_t *state);
+
+#endif  /* MOVE_DO_H */

src/move-gen.c

@@ -0,0 +1,480 @@
+/* move-gen.c - move generation
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stdio.h>
+
+#include "bitops.h"
+#include "bug.h"
+
+#include "chessdefs.h"
+#include "board.h"
+#include "bitboard.h"
+#include "piece.h"
+#include "position.h"
+#include "move.h"
+#include "hyperbola-quintessence.h"
+#include "attack.h"
+#include "move-gen.h"
+
+
+/**
+ * pseudo_is_legal() - check if a move is legal.
+ * @pos:  position
+ * @move: move_t to verify
+ *
+ * @return: true if move is valid, false otherwise.
+ */
+bool pseudo_is_legal(const pos_t *pos, const move_t move)
+{
+    color_t  us = pos->turn, them = OPPONENT(us);
+    square_t from = move_from(move), to = move_to(move);
+    square_t king = pos->king[us];
+    bitboard_t kingbb = pos->bb[us][KING];
+    bitboard_t occ = pos_occ(pos);
+    u64 pinned = mask(from) & pos->blockers;
+    u64 checkers = pos->checkers;
+
+    /* (1) - Castling & King
+     * For castling, we need to check intermediate squares attacks only.
+     * Attention: To test if K is in check after moving, we need to exclude
+     * king from occupation bitboard (to catch king moving away from checker
+     * on same line) !
+     */
+    if (unlikely(from == king)) {
+        if (unlikely(is_castle(move))) {
+            square_t dir = to > from? 1: -1;
+            if (sq_attackers(pos, occ, from + dir, them))
+                return false;
+        }
+        return !sq_attackers(pos, occ ^ kingbb, to, them);
+    }
+
+    /* (2) - King is in check
+     * Double-check is already handled in (1), as only K moves were generated
+     * by pseudo legal move generator.
+     * Here, allowed dest squares are only on King-checker line, or on checker
+     * square.
+     * attacker.
+     * Special cases:
+     *   e.p., legal if the grabbed pawn is giving check
+     *   pinned piece: always illegal
+     */
+    if (checkers) {
+        if (pinned)
+            return false;
+        if (bb_multiple(checkers))
+            return false;
+        square_t checker = ctz64(checkers);
+        if (is_enpassant(move)) {
+            return pos->en_passant + sq_up(them) == checker;
+        }
+        return true;
+        //bitboard_t between = bb_between[king][checker] | pos->checkers;
+        //return mask(to) & between;
+    }
+
+    /* (3) - pinned pieces
+     * We verify here that pinned piece P stays on line King-P.
+     */
+    if (mask(from) & pos->blockers) {
+        return bb_line[from][king] & mask(to);    /* is to on pinner line ? */
+    }
+
+    /* (4) - En-passant
+     * pinned pieces are handled in pinned section.
+     * One case not handled anywhere else: when the two "disappearing" pawns
+     * would discover a R/Q horizontal check.
+     */
+    if (is_enpassant(move)) {
+        bitboard_t rank5 = us == WHITE? RANK_5bb: RANK_4bb;
+
+        if ((pos->bb[us][KING] & rank5)) {
+            bitboard_t exclude = mask(pos->en_passant - sq_up(us)) | mask(from);
+            bitboard_t rooks = (pos->bb[them][ROOK] | pos->bb[them][QUEEN]) & rank5;
+
+            while (rooks) {
+                square_t rook = bb_next(&rooks);
+                if (hyperbola_rank_moves(occ ^ exclude, rook) & kingbb)
+                    return false;
+            }
+        }
+    }
+    return true;
+}
+
+/**
+ * pos_next_legal() - get next legal move in position.
+ * @pos:  position
+ * @movelist: &pseudo-legal movelist
+ * @start:  &int, starting position in @movelist
+ *
+ * Get next valid move in @pos move list, from move @start, or MOVE_NONE.
+ * @start is set to next non-checked move in pseudo-legal list.
+ * Position pseudo-legal moves must be already calculated before calling this function.
+ *
+ * @return: move, or MOVE_NONE if no move.
+ */
+move_t pos_next_legal(const pos_t *pos, movelist_t *movelist, int *start)
+{
+    const int nmoves = movelist->nmoves;
+    const move_t *moves = movelist->move;
+    move_t move;
+
+    while (*start < nmoves) {
+        if (pseudo_is_legal(pos, (move = moves[(*start)++] )))
+            return  move;
+    }
+    return MOVE_NONE;
+}
+
+/**
+ * pos_all_legal() - get the list of legal moves from pseudo-legal.
+ * @pos:  position
+ * @movelist: &pseudo-legal movelist_t
+ * @dest: &destination movelist_t
+ *
+ * The pseudo-legal moves must be already calculated before calling this function.
+ * No check is done on @dest limits.
+ *
+ * @Return: @dest
+ */
+movelist_t *pos_all_legal(const pos_t *pos, movelist_t *movelist, movelist_t *dest)
+{
+    int tmp = dest->nmoves = 0;
+    move_t move;
+
+    while ((move = pos_next_legal(pos, movelist, &tmp)) != MOVE_NONE)
+        dest->move[dest->nmoves++] = move;
+    return dest;
+}
+
+/**
+ * gen_pseudo_king() - generate king pseudo-legal moves.
+ * @pos: position
+ * @movelist: &movelist_t array to store pseudo-moves
+ *
+ */
+static inline __unused move_t *gen_pseudo_king(move_t *moves, square_t from,
+                                               bitboard_t mask)
+{
+    //color_t us    = pos->turn;
+    //square_t from = pos->king[us];
+    //bitboard_t not_my_pieces     = ~pos->bb[us][ALL_PIECES];
+    bitboard_t to_bb = bb_king_moves(mask, from);
+    square_t to;
+    while (moves) {
+        to = bb_next(&to_bb);
+        *moves++ = move_make(from, to);
+    }
+    return moves;
+}
+
+/**
+ * pos_gen_check_pseudomoves() - generate position pseudo-legal moves when in check
+ * @pos: position
+ * @movelist: &movelist_t array to store pseudo-moves
+ *
+ * Generate all @pos pseudo moves for player-to-move.
+ * @movelist is filled with the moves.
+ *
+ * Only a few validity checks are done here (i.e. moves are not generated):
+ *  - castling, if king is in check
+ *  - castling, if king passes an enemy-controlled square (not final square).
+ * When immediately known, a few move flags are also applied in these cases:
+ *  - castling: M_CASTLE_{K,Q}
+ *  - capture (excl. en-passant): M_CAPTURE
+ *  - en-passant: M_EN_PASSANT
+ *  - pawn double push: M_DPUSH
+ *  - promotion: M_PROMOTION
+ *  - promotion and capture
+ *
+ * TODO: move code to specific functions (especially castling, pawn push/capture)
+ *
+ * @Return: The total number of moves.
+ */
+
+/**
+ * gen_pseudo_escape() - generate position pseudo-legal moves when in check
+ * @pos: square_t king position
+ * @mask: possible destinations to consider
+ * @moves: &move_t array to store pseudo-moves
+ *
+ * Generate all @pos pseudo moves for player-to-move, when in check.
+ * @movelist is filled with the moves.
+ *
+ * If king is doubles-checked, only King moves will be generated.
+ * Otherwise, only moves where destination in between King or checker, or checker
+ * square.
+ *
+ */
+/*
+ * static void __always_inline gen_pseudo_escape(pos_t *pos, movelist_t *movelist)
+ * {
+ *     color_t us               = pos->turn;
+ *     color_t them             = OPPONENT(us);
+ *     square_t king            = pos->king[us];
+ *
+ *     gen_pseudo_king(pos, movelist);
+ *
+ * }
+ */
+
+/**
+ * move_make_promotions() - generate all promotions for given pawn and dest.
+ * @moves: &move_t array where to store moves
+ * @from: pawn position
+ * @to: promotion square
+ *
+ * Generate all (Q/R/B/N) promotion moves on @to for pawn @from.
+ *
+ * @Return: New @moves (incremented by 4).
+ */
+static inline move_t *move_make_promotions(move_t *moves, square_t from, square_t to)
+{
+    for (piece_type_t pt = QUEEN; pt >= KNIGHT; --pt)
+        *moves++ = move_make_promote(from, to, pt);
+    return moves;
+}
+
+/**
+ * pos_gen_pseudomoves() - generate position pseudo-legal moves
+ * @pos: position
+ * @movelist: &movelist_t array to store pseudo-moves
+ *
+ * Generate all @pos pseudo moves for player-to-move.
+ * @movelist is filled with the moves.
+ *
+ * Only a few validity checks are done here (i.e. moves are not generated):
+ *  - castling, if king is in check
+ *  - castling, if king passes an enemy-controlled square (not final square).
+ * When immediately known, a few move flags are also applied in these cases:
+ *  - castling: M_CASTLE_{K,Q}
+ *  - capture (excl. en-passant): M_CAPTURE
+ *  - en-passant: M_EN_PASSANT
+ *  - pawn double push: M_DPUSH
+ *  - promotion: M_PROMOTION
+ *  - promotion and capture
+ *
+ * TODO: move code to specific functions (especially castling, pawn push/capture)
+ *
+ * @Return: The total number of moves.
+ */
+int pos_gen_pseudomoves(pos_t *pos, movelist_t *movelist)
+{
+    color_t us               = pos->turn;
+    color_t them             = OPPONENT(us);
+
+    bitboard_t my_pieces     = pos->bb[us][ALL_PIECES];
+    bitboard_t enemy_pieces  = pos->bb[them][ALL_PIECES];
+    bitboard_t dest_squares  = ~my_pieces;
+    bitboard_t occ           = my_pieces | enemy_pieces;
+    bitboard_t empty         = ~occ;
+
+    bitboard_t from_bb, to_bb;
+    bitboard_t tmp_bb;
+    move_t *moves            = movelist->move;
+    //int *nmoves              = &movelist->nmoves;
+    square_t from, to;
+    square_t king = pos->king[us];
+
+    //*nmoves = 0;
+
+    /* king - MUST BE FIRST (we stop if doubler check) */
+    to_bb = bb_king_moves(dest_squares, king);
+    while(to_bb) {
+        to = bb_next(&to_bb);
+        *moves++ = move_make(king, to);
+    }
+
+    if (bb_multiple(pos->checkers))               /* double check, we stop here */
+        goto finish;
+
+    if (pos->checkers) {
+        /* one checker: we limit destination squares to line between
+         * checker and king + checker square (think: knight).
+         */
+        square_t checker = ctz64(pos->checkers);
+        dest_squares &= bb_between[king][checker] | pos->checkers;
+        enemy_pieces &= dest_squares;
+    } else {
+        /* no checker: castling moves
+         * Attention ! Castling flags are assumed correct
+         */
+        bitboard_t rel_rank1 = bb_rel_rank(RANK_1, us);
+        //square_t from_square[2] = { E1, E8 };     /* verify king is on E1/E8 */
+        //bug_on(can_castle(pos->castle, us) && from != from_square[us]);
+        /* For castle, we check the opponent attacks on squares between from and to.
+         * To square attack check will be done in gen_is_legal.
+         */
+        if (can_oo(pos->castle, us)) {
+            bitboard_t occmask = rel_rank1 & (FILE_Fbb | FILE_Gbb);
+            if (!(occ & occmask)) {
+                *moves++ = move_make_flags(king, king + 2, M_CASTLE_K);
+            }
+        }
+        if (can_ooo(pos->castle, us)) {
+            bitboard_t occmask = rel_rank1 & (FILE_Bbb | FILE_Cbb | FILE_Dbb);
+            if (!(occ & occmask)) { // &&
+                *moves++ = move_make_flags(king, king - 2, M_CASTLE_Q);
+            }
+        }
+    }
+    /* sliding pieces */
+    from_bb = pos->bb[us][BISHOP] | pos->bb[us][QUEEN];
+    while (from_bb) {
+        from = bb_next(&from_bb);
+        to_bb = hyperbola_bishop_moves(occ, from) & dest_squares;
+        while(to_bb) {
+            to = bb_next(&to_bb);
+            *moves++ = move_make(from, to);
+        }
+    }
+    from_bb = pos->bb[us][ROOK] | pos->bb[us][QUEEN];
+    while (from_bb) {
+        from = bb_next(&from_bb);
+        to_bb = hyperbola_rook_moves(occ, from) & dest_squares;
+        while(to_bb) {
+            to = bb_next(&to_bb);
+            *moves++ = move_make(from, to);
+        }
+    }
+
+    /* knight */
+    from_bb = pos->bb[us][KNIGHT];
+    while (from_bb) {
+        from = bb_next(&from_bb);
+        to_bb = bb_knight_moves(dest_squares, from);
+        while(to_bb) {
+            to = bb_next(&to_bb);
+            *moves++ = move_make(from, to);
+        }
+    }
+
+    /* pawn: relative rank and files */
+    bitboard_t rel_rank8 = bb_rel_rank(RANK_8, us);
+    bitboard_t rel_rank3 = bb_rel_rank(RANK_3, us);
+
+    /* pawn: push */
+    int shift = sq_up(us);
+    tmp_bb = bb_shift(pos->bb[us][PAWN], shift) & empty;
+
+    to_bb = tmp_bb & ~rel_rank8 & dest_squares;   /* non promotion */
+    while(to_bb) {
+        to = bb_next(&to_bb);
+        from = to - shift;
+        *moves++ = move_make(from, to);
+    }
+    to_bb = tmp_bb & rel_rank8 & dest_squares;           /* promotions */
+    while(to_bb) {
+        to = bb_next(&to_bb);
+        from = to - shift;
+        moves = move_make_promotions(moves, from, to);
+    }
+
+    /* possible second push */
+    to_bb = bb_shift(tmp_bb & rel_rank3, shift) & empty & dest_squares;
+    while(to_bb) {
+        to = bb_next(&to_bb);
+        from = to - shift - shift;
+        *moves++ = move_make_flags(from, to, M_DPUSH);
+    }
+
+    /* pawn: captures */
+    /*
+     * tmp_bb = pawn_attacks_bb(pos->bb[us][PAWN], us) & enemy_pieces;
+     * //bb_print("FAIL", tmp_bb);
+     * to_bb = tmp_bb & ~rel_rank8;
+     * while (to_bb) {
+     *     to = bb_next(&to_bb);
+     *     from_bb = bb_pawn_attacks[them][to] & pos->bb[us][PAWN];
+     *     while (from_bb) {
+     *         from = bb_next(&from_bb);
+     *         *moves++ = move_make(from, to);
+     *     }
+     * }
+     * to_bb = tmp_bb & rel_rank8;
+     * while (to_bb) {
+     *     to = bb_next(&to_bb);
+     *     from_bb = bb_pawn_attacks[them][to] & pos->bb[us][PAWN];
+     *     while (from_bb) {
+     *         from = bb_next(&from_bb);
+     *         moves = move_make_promotions(moves, from, to);
+     *     }
+     * }
+     */
+
+    /* pawn: captures left */
+    bitboard_t filter = ~bb_rel_file(FILE_A, us);
+    shift = sq_upleft(us);
+    tmp_bb = bb_shift(pos->bb[us][PAWN] & filter, shift) & enemy_pieces;
+
+    to_bb = tmp_bb & ~rel_rank8;
+    while (to_bb) {
+        to = bb_next(&to_bb);
+        from = to - shift;
+        *moves++ = move_make(from, to);
+    }
+    to_bb = tmp_bb & rel_rank8;
+    while (to_bb) {
+        to = bb_next(&to_bb);
+        from = to - shift;
+        moves = move_make_promotions(moves, from, to);
+    }
+
+    /* pawn: captures right */
+    filter = ~bb_rel_file(FILE_H, us);
+    shift = sq_upright(us);
+    tmp_bb = bb_shift(pos->bb[us][PAWN] & filter, shift) & enemy_pieces;
+    to_bb = tmp_bb & ~rel_rank8;
+    while (to_bb) {
+        to = bb_next(&to_bb);
+        from = to - shift;
+        *moves++ = move_make(from, to);
+    }
+    to_bb = tmp_bb & rel_rank8;
+    while (to_bb) {
+        to = bb_next(&to_bb);
+        from = to - shift;
+        moves = move_make_promotions(moves, from, to);
+    }
+
+    /* pawn: en-passant
+     * TODO: special case when in-check here ?
+     */
+    if ((to = pos->en_passant) != SQUARE_NONE) {
+        from_bb = bb_pawn_attacks[them][to] & pos->bb[us][PAWN];
+        while (from_bb) {
+            from = bb_next(&from_bb);
+            *moves++ = move_make_enpassant(from, to);
+        }
+    }
+    /*
+     * to_bb = mask(to);
+     *     /\* if e.p not on file H, we may add an e.p move to "up-left" *\/
+     *     filter = ~bb_rel_file(FILE_A, us);
+     *     shift = sq_upleft(us);
+     *     if (bb_shift(pos->bb[us][PAWN] & filter, shift) & to_bb)
+     *         *moves++ = move_make_enpassant(to - shift, to);
+     *
+     *     filter = ~bb_rel_file(FILE_H, us);
+     *     shift = sq_upright(us);
+     *     if (bb_shift(pos->bb[us][PAWN] & filter, shift) & to_bb)
+     *         *moves++ = move_make_enpassant(to - shift, to);
+     * }
+     */
+
+    /* TODO: add function per piece, and type, for easier debug
+     */
+finish:
+    return movelist->nmoves = moves - movelist->move;
+}

src/move-gen.h

@@ -0,0 +1,29 @@
+/* move-gen.h - move generation
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#ifndef MOVEGEN_H
+#define MOVEGEN_H
+
+#include "bitops.h"
+
+#include "bitboard.h"
+#include "hyperbola-quintessence.h"
+#include "piece.h"
+#include "move.h"
+
+bool pseudo_is_legal(const pos_t *pos, const move_t move);
+move_t pos_next_legal(const pos_t *pos, movelist_t *movelist, int *start);
+movelist_t *pos_all_legal(const pos_t *pos, movelist_t *movelist, movelist_t *dest);
+int pos_gen_pseudomoves(pos_t *pos, movelist_t *movelist);
+
+#endif  /* MOVEGEN_H */

src/move.h

@@ -1,6 +1,6 @@
 /* move.h - move management.
  *
- * Copyright (C) 2021 Bruno Raoult ("br")
+ * Copyright (C) 2021-2024 Bruno Raoult ("br")
  * Licensed under the GNU General Public License v3.0 or later.
  * Some rights reserved. See COPYING.
  *
@@ -15,20 +15,121 @@
 #define MOVE_H
 
 #include "chessdefs.h"
-#include "position.h"
-#include "pool.h"
 #include "piece.h"
+#include "board.h"
 
-/* move flags
+/* move structure:
+ * 3 3     2 2    1 1 1 1 1 1
+ * 1 0     4 3    8 7 5 4 2 1    6 5    0
+ * S UUUUUUU FFFFFF ccc ppp tttttt ffffff
+ *
+ * bits    len off range         type         mask        get  desc
+ * ffffff    6   0   0-5     square_t          077        &077 from
+ * tttttt    6   6  6-11     square_t        07700 (>>6)  &077 to
+ * ppp       3  12 12-14 piece_type_t       070000 (>>12) &07  promoted
+ * ccc       3  15 15-17 piece_type_t      0700000 (>>15) &07  captured
+ * FFFFFF    6  18 18-23 move_flags_t    077000000 (>>18) &077 N/A  flags
+ * UUUUUUU   7  24 24-30       unused 017700000000             future usage
+ * S         1  31 31-31            - 020000000000             sign
  */
-typedef unsigned char move_flags_t;
-#define M_NORMAL       0x00
-#define M_CHECK        0x01                       /* unsure if we know */
-#define M_CAPTURE      0x02
-#define M_EN_PASSANT   0x04
-#define M_PROMOTION    0x08
-#define M_CASTLE_K     0x10
-#define M_CASTLE_Q     0x20
+typedef s32 move_t;
+
+/* special move_t values */
+#define MOVE_NONE ((move_t) -1)
+#define MOVE_NULL ((move_t) 0)                    /* hack: from = to = A1 */
+
+enum {
+    M_OFF_FROM     = 0,
+    M_OFF_TO       = 6,
+    M_OFF_PROMOTED = 12,
+    M_OFF_CAPTURED = 15,
+    M_OFF_FLAGS    = 18
+};
+
+typedef enum {
+    M_CAPTURE   = mask(M_OFF_FLAGS + 0),
+    M_ENPASSANT = mask(M_OFF_FLAGS + 1),
+    M_PROMOTION = mask(M_OFF_FLAGS + 2),
+    M_CASTLE_K  = mask(M_OFF_FLAGS + 3),          /* maybe only one ? */
+    M_CASTLE_Q  = mask(M_OFF_FLAGS + 5),          /* maybe only one ? */
+    M_CHECK     = mask(M_OFF_FLAGS + 6),          /* maybe unknown/useless ? */
+    M_DPUSH     = mask(M_OFF_FLAGS + 7)           /* pawn double push */
+} move_flags_t;
+
+#define move_set_flags(move, flags) ((move) | (flags))
+
+#define is_capture(m)   ((m) & M_CAPTURE)
+#define is_enpassant(m) ((m) & M_ENPASSANT)
+#define is_promotion(m) ((m) & M_PROMOTION)
+#define is_castle(m)    ((m) & (M_CASTLE_K | M_CASTLE_Q))
+#define is_castle_K(m)  ((m) & M_CASTLE_K)
+#define is_castle_Q(m)  ((m) & M_CASTLE_Q)
+#define is_check(m)     ((m) & M_CHECK)
+#define is_dpush(m)     ((m) & M_DPUSH)
+
+#define MOVES_MAX   256
+
+typedef struct __movelist_s {
+    move_t move[MOVES_MAX];
+    int nmoves;                                   /* total moves (fill) */
+} movelist_t;
+
+static inline square_t move_from(move_t move)
+{
+    return move & 077;
+}
+
+static inline square_t move_to(move_t move)
+{
+    return (move >> M_OFF_TO) & 077;
+}
+
+static inline piece_type_t move_promoted(move_t move)
+{
+    return (move >> M_OFF_PROMOTED) & 07;
+}
+
+static inline piece_type_t move_captured(move_t move)
+{
+    return (move >> M_OFF_CAPTURED) & 07;
+}
+
+static inline move_t move_make(square_t from, square_t to)
+{
+    return (to << M_OFF_TO) | from;
+}
+
+static inline move_t move_make_flags(square_t from, square_t to, move_flags_t flags)
+{
+    return move_set_flags(move_make(from, to), flags);
+}
+
+static inline move_t move_make_capture(square_t from, square_t to)
+{
+    return move_make_flags(from, to, M_CAPTURE);
+}
+
+static inline move_t move_make_enpassant(square_t from, square_t to)
+{
+    return move_make_flags(from, to, M_ENPASSANT);
+}
+
+static inline move_t move_make_promote(square_t from, square_t to,
+                                       piece_type_t promoted)
+{
+    return move_make_flags(from, to, M_PROMOTION) | (promoted << M_OFF_PROMOTED);
+}
+
+static inline move_t move_make_promote_capture(square_t from, square_t to,
+                                               piece_type_t promoted)
+{
+    return move_make_promote(from, to, promoted) | M_CAPTURE;
+}
+
+static inline move_t move_set_captured(move_t move, piece_type_t captured)
+{
+    return move | (captured << M_OFF_CAPTURED);
+}
 
 /* moves_print flags
  */
@@ -36,44 +137,14 @@ typedef unsigned char move_flags_t;
 #define M_PR_NCAPT     0x02
 #define M_PR_NUM       0x04
 #define M_PR_NL        0x08
+#define M_UCI          0x10                       /* UCI style - e7e8q */
 #define M_PR_EVAL      0x20                       /* separate captures */
 #define M_PR_SEPARATE  0x40                       /* separate captures */
 #define M_PR_LONG      0x80
 
-typedef struct move_s {
-    piece_t piece;
-    square_t from, to;
-    piece_t capture;                              /* captured piece */
-    piece_t promotion;                            /* promoted piece */
-    move_flags_t flags;
-    eval_t negamax;
-    eval_t eval;
-    eval_t eval_simple;
-    pos_t *pos;
-    struct list_head list;                        /* next move */
-} move_t;
-
-pool_t *moves_pool_init();
-void moves_pool_stats();
-int move_print(int movenum, move_t *move, move_flags_t flags);
-void moves_print(pos_t *move, move_flags_t flags);
-
-void move_del(struct list_head *ptr);
-int moves_del(pos_t *pos);
-
-int pseudo_moves_castle(pos_t *pos, bool color, bool doit, bool do_king);
-int pseudo_moves_gen(pos_t *pos, piece_list_t *piece, bool doit, bool do_king);
-int pseudo_moves_pawn(pos_t *pos, piece_list_t *piece, bool doit);
-int moves_gen(pos_t *pos, bool color, bool doit, bool do_king);
-int moves_gen_king_moves(pos_t *pos, bool color, bool doit);
-
-void moves_sort(pos_t *pos);
-void moves_gen_eval_sort(pos_t *pos);
-
-void moves_gen_all(pos_t *pos);
-void moves_gen_all_nomoves(pos_t *pos);
-
-pos_t *move_do(pos_t *pos, move_t *move);
-void move_undo(pos_t *pos, move_t *move);
+//int move_print(int movenum, move_t *move, move_flags_t flags);
+char *move_str(char *dst, const move_t move, __unused const int flags);
+void moves_print(movelist_t *moves, int flags);
+void move_sort_by_sq(movelist_t *moves);
 
 #endif  /* MOVE_H */

src/piece.c

@@ -1,6 +1,6 @@
 /* piece.c - piece list management.
  *
- * Copyright (C) 2021 Bruno Raoult ("br")
+ * Copyright (C) 2021-2024 Bruno Raoult ("br")
  * Licensed under the GNU General Public License v3.0 or later.
  * Some rights reserved. See COPYING.
  *
@@ -13,106 +13,83 @@
 
 #include <malloc.h>
 #include <ctype.h>
+#include <string.h>
+#include <assert.h>
 
-#include <debug.h>
-#include <pool.h>
-#include <list.h>
+#include "bug.h"
 
 #include "chessdefs.h"
 #include "piece.h"
-#include "board.h"
-#include "bitboard.h"
-#include "position.h"
 
-static pool_t *pieces_pool;
-
-struct piece_details piece_details[] = {
-    [E_EMPTY]  = { ' ', ' ', " ", " ", "",       0 },
-    [E_PAWN]   = { 'P', 'p', "♙", "♟", "Pawn",   PAWN_VALUE },
-    [E_KNIGHT] = { 'N', 'n', "♘", "♞", "Knight", KNIGHT_VALUE },
-    [E_BISHOP] = { 'B', 'b', "♗", "♝", "Bishop", BISHOP_VALUE },
-    [E_ROOK]   = { 'R', 'r', "♖", "♜", "Rook",   ROOK_VALUE },
-    [E_QUEEN]  = { 'Q', 'q', "♕", "♛", "Queen",  QUEEN_VALUE },
-    [E_KING]   = { 'K', 'k', "♔", "♚", "King",   KING_VALUE }
+/**
+ * piece_details
+ */
+const struct piece_details piece_details[PIECE_MAX] = {
+    /*             cap  low  fen  sym  name      values */
+    [EMPTY]    = { "",  "",  "",  "",  "",       0, 0, 0 },
+    [W_PAWN]   = { "",  "",  "P", "♙", "Pawn",   P_VAL_OPN, P_VAL_MID, P_VAL_END },
+    [W_KNIGHT] = { "N", "n", "N", "♘", "Knight", N_VAL_OPN, N_VAL_MID, N_VAL_END },
+    [W_BISHOP] = { "B", "b", "B", "♗", "Bishop", B_VAL_OPN, B_VAL_MID, B_VAL_END },
+    [W_ROOK]   = { "R", "r", "R", "♖", "Rook",   R_VAL_OPN, R_VAL_MID, R_VAL_END },
+    [W_QUEEN]  = { "Q", "q", "Q", "♕", "Queen",  Q_VAL_OPN, Q_VAL_MID, Q_VAL_END },
+    [W_KING]   = { "K", "k", "K", "♔", "King",   K_VAL_OPN, K_VAL_MID, K_VAL_END },
+    [7]        = { "",  "",  "",  "",  "",       0, 0, 0 },
+    [8]        = { "",  "",  "",  "",  "",       0, 0, 0 },
+    [B_PAWN]   = { "",  "",  "p", "♟", "Pawn",   P_VAL_OPN, P_VAL_MID, P_VAL_END },
+    [B_KNIGHT] = { "N", "n", "n", "♞", "Knight", P_VAL_OPN, N_VAL_MID, N_VAL_END },
+    [B_BISHOP] = { "B", "b", "b", "♝", "Bishop", P_VAL_OPN, B_VAL_MID, B_VAL_END },
+    [B_ROOK]   = { "R", "r", "r", "♜", "Rook",   P_VAL_OPN, R_VAL_MID, R_VAL_END },
+    [B_QUEEN]  = { "Q", "q", "q", "♛", "Queen",  P_VAL_OPN, Q_VAL_MID, Q_VAL_END },
+    [B_KING]   = { "K", "k", "k", "♚", "King",   P_VAL_OPN, K_VAL_MID, K_VAL_END },
 };
 
-void piece_list_print(struct list_head *list)
+const char pieces_str[6+6+1] = "PNBRQKpnbrqk";
+
+bool piece_ok(piece_t p)
 {
-    struct list_head *p_cur, *tmp;
-    piece_list_t *piece;
-
-    list_for_each_safe(p_cur, tmp, list) {
-        piece = list_entry(p_cur, piece_list_t, list);
-
-        printf("%s%c%c ", P_SYM(piece->piece),
-               FILE2C(F88(piece->square)),
-               RANK2C(R88(piece->square)));
-    }
-    printf("\n");
+    piece_type_t pt = PIECE(p);
+    return !(p & ~(MASK_COLOR | MASK_PIECE)) && pt && (pt <= KING);
 }
 
-pool_t *piece_pool_init()
+char *piece_to_cap(piece_t p)
 {
-    if (!pieces_pool)
-        pieces_pool = pool_create("pieces", 128, sizeof(piece_list_t));
-    return pieces_pool;
+    return piece_details[p].cap;
 }
 
-void piece_pool_stats()
+char *piece_to_char(piece_t p)
 {
-    if (pieces_pool)
-        pool_stats(pieces_pool);
+    return piece_details[p].fen;
 }
 
-piece_list_t *piece_add(pos_t *pos, piece_t piece, square_t square)
+char *piece_to_low(piece_t p)
 {
-    piece_list_t *new;
-    short color = COLOR(piece);
-
-#   ifdef DEBUG_PIECE
-    log_f(3, "piece=%02x square=%02x\n", piece, square);
-    log_f(5, "Adding %s %s on %c%c\n", color? "Black": "White",
-          P_NAME(piece), FILE2C(F88(square)), RANK2C(R88(square)));
-#   endif
-    if ((new = pool_get(pieces_pool))) {
-        /* first piece is always king */
-        if (PIECE(piece) == KING)
-            list_add(&new->list, &pos->pieces[color]);
-        else
-            list_add_tail(&new->list, &pos->pieces[color]);
-        new->piece = piece;
-        new->square = square;
-        new->castle = 0;
-        new-> value = piece_details[PIECE(piece)].value;
-    }
-
-    return new;
+    return piece_details[p].low;
 }
 
-void piece_del(struct list_head *ptr)
+char *piece_to_sym(piece_t p)
 {
-    piece_list_t *piece = list_entry(ptr, piece_list_t, list);
-#   ifdef DEBUG_PIECE
-    log_f(3, "piece=%02x square=%02x\n", piece->piece, piece->square);
-#   endif
-    list_del(ptr);
-    pool_add(pieces_pool, piece);
-    return;
+    return piece_details[p].sym;
 }
 
-int pieces_del(pos_t *pos, short color)
+char *piece_to_name(piece_t p)
 {
-    struct list_head *p_cur, *tmp, *head;
-    int count = 0;
-
-    head = &pos->pieces[color];
-
-    list_for_each_safe(p_cur, tmp, head) {
-        piece_del(p_cur);
-        count++;
-    }
-#   ifdef DEBUG_PIECE
-    log_f(3, "color=%d removed=%d\n", color, count);
-#   endif
-    return count;
+    return piece_details[p].name;
+}
+
+piece_type_t piece_t_from_char(char c)
+{
+    char *p = strchr(pieces_str, c);
+    return p? (p - pieces_str) % 6 + 1: NO_PIECE_TYPE;
+}
+
+//piece_type_t piece_from_promotion(char c, color_t color)
+//{
+//    piece_type_t piece = piece_t_from_char(c);
+//    return piece? SET_COLOR()p? (p - pieces_str) % 6 + 1: NO_PIECE_TYPE;
+//}
+
+piece_t piece_from_char(char c)
+{
+    piece_type_t piece = piece_t_from_char(c);
+    return isupper(c)? SET_WHITE(piece): SET_BLACK(piece);
 }

src/piece.h

@@ -1,6 +1,6 @@
 /* piece.h - piece definitions.
  *
- * Copyright (C) 2021 Bruno Raoult ("br")
+ * Copyright (C) 2021-2024 Bruno Raoult ("br")
  * Licensed under the GNU General Public License v3.0 or later.
  * Some rights reserved. See COPYING.
  *
@@ -14,58 +14,127 @@
 #ifndef PIECE_H
 #define PIECE_H
 
-#include <ctype.h>
+#include <string.h>
 
 #include "chessdefs.h"
-#include "list.h"
-#include "pool.h"
 
-#define PIECE_DEFAULT_VALUE 0
+/* piece_t bits structure
+ * piece is on bits 1-3, color on bit 4:
+ * .... CPPP
+ * C: 0 for white, 1: black
+ * PPP: pawn (1), knight, bishop, rook, queen, king (6)
+ */
+typedef enum {
+    WHITE, BLACK,
+    COLOR_MAX
+} color_t;
 
-/* initial default values */
-#define PAWN_VALUE    100
-#define KNIGHT_VALUE  300
-#define BISHOP_VALUE  300
-#define ROOK_VALUE    500
-#define QUEEN_VALUE   900
-#define KING_VALUE    20000
+typedef enum {
+    ALL_PIECES = 0,                               /* 'all pieces' bitboard */
+    NO_PIECE_TYPE = 0,
+    PAWN = 1, KNIGHT, BISHOP, ROOK, QUEEN, KING,
+    PIECE_TYPE_MAX = 7                            /* bit 4 */
+} piece_type_t;
 
-typedef struct piece_list_s {
-    piece_t piece;
-    square_t square;
-    short castle;
-    s64 value;
-    struct list_head list;
-} piece_list_t;
+typedef enum __piece_e {
+    EMPTY = 0,
+    NO_PIECE = 0,
+    W_PAWN = PAWN, W_KNIGHT, W_BISHOP, W_ROOK, W_QUEEN, W_KING,
+    B_PAWN = PAWN | 8, B_KNIGHT, B_BISHOP, B_ROOK, B_QUEEN, B_KING,
+    PIECE_MAX
+} piece_t;
+
+/* default values for opening, midgame, endgame
+ */
+#define E_VAL_OPN    0                            /* empty */
+#define P_VAL_OPN    100
+#define N_VAL_OPN    300
+#define B_VAL_OPN    300
+#define R_VAL_OPN    500
+#define Q_VAL_OPN    900
+#define K_VAL_OPN    20000
+
+#define E_VAL_MID    0
+#define P_VAL_MID    100
+#define N_VAL_MID    300
+#define B_VAL_MID    300
+#define R_VAL_MID    500
+#define Q_VAL_MID    900
+#define K_VAL_MID    20000
+
+#define E_VAL_END    0
+#define P_VAL_END    100
+#define N_VAL_END    300
+#define B_VAL_END    300
+#define R_VAL_END    500
+#define Q_VAL_END    900
+#define K_VAL_END    20000
 
 /* some default values for pieces
+ * @abbr:   char, piece capital letter (used for game notation)
+ * @abbr_c: char, capital for white, lowercase for black
+ * char *sym;
+ *  char *sym_c;
+ *  char *name;
+ *  s64  opn_value;
+ *  s64  mid_value;
+ *  s64  end_value;
  */
-extern struct piece_details {
-    char abbrev_w;                                /* used for game notation */
-    char abbrev_b;
-    char *symbol_w;
-    char *symbol_b;                               /* used for game notation */
-    char *name;
-    s64  value;
-} piece_details[];
+extern const struct piece_details {
+    char *cap;                                    /* used for game notation */
+    char *low;                                    /* used also for UCI promotion */
+    char *fen;                                    /* cap=white, low=black */
+    char *sym;                                    /* UTF-8 symbol */
+    char *name;                                   /* piece name */
+    s64  opn_value;                               /* value opening */
+    s64  mid_value;                               /* value midgame */
+    s64  end_value;                               /* value endgame */
+} piece_details[PIECE_MAX];
+
+extern const char pieces_str[6+6+1];              /* to search from fen/user input */
+
+#define OPPONENT(color)   !(color)
+
+#define MASK_PIECE        0x07                      /* 00000111 */
+#define MASK_COLOR        0x08                      /* 00001000 */
+
+#define COLOR(p)          ((p) >> 3)              /* bitmask */
+#define PIECE(p)          ((p) & MASK_PIECE)
+#define MAKE_PIECE(p, c)  ((p) | (c) << 3)
+
+#define IS_WHITE(p)       (!COLOR(p))
+#define IS_BLACK(p)       (COLOR(p))
+
+#define SET_WHITE(p)      (piece_t)((p) &= ~MASK_COLOR)
+#define SET_BLACK(p)      (piece_t)((p) |= MASK_COLOR)
+#define SET_COLOR(p, c)   (piece_t)(!(c)? SET_WHITE(p): SET_BLACK(p))
+
+bool piece_ok(piece_t p);
+
+char *piece_to_cap(piece_t p);
+char *piece_to_low(piece_t p);
+char *piece_to_fen(piece_t p);
+char *piece_to_sym(piece_t p);
+char *piece_to_name(piece_t p);
+
+#define piece_to_char(c) piece_to_fen(c)
+//#define piece_to_char_t(p) piece_to_uci(p)
+
+//piece_type_t char_to_piece(char c);
+piece_type_t piece_t_from_char(char c);
+piece_t piece_from_fen(char c);
+
+#define piece_from_char(c) piece_from_fen(c)
 
-#define P_NAME(p)      piece_details[E_PIECE(p)].name
-#define P_LETTER(p)    piece_details[E_PIECE(p)].abbrev_w
-#define P_SYM(p)       piece_details[E_PIECE(p)].symbol_b
-#define P_CSHORT(p)    (IS_WHITE(p)? piece_details[E_PIECE(p)].abbrev_w: \
-                        piece_details[E_PIECE(p)].abbrev_b)
-#define P_CSYM(p)      (IS_WHITE(p)? piece_details[E_PIECE(p)].symbol_w: \
-                        piece_details[E_PIECE(p)].symbol_b)
-#define P_VALUE(p)     (piece_details[E_PIECE(p)].value)
 /* use short name or symbol - no effect
  */
 #define P_USE_UTF      1
 
-void piece_list_print(struct list_head *list);
-pool_t *piece_pool_init();
-void piece_pool_stats();
-piece_list_t *piece_add(pos_t *pos, piece_t piece, square_t square);
-void piece_del(struct list_head *ptr);
-int pieces_del(pos_t *pos, short color);
+//void piece_list_print(struct list_head *list);
+//pool_t *piece_pool_init();
+//void piece_pool_stats();
+//piece_list_t *piece_add(pos_t *pos, piece_t piece, square_t square);
+//void piece_del(struct list_head *ptr);
+//int pieces_del(pos_t *pos, short color);
 
 #endif

src/position.c

@@ -1,6 +1,6 @@
 /* position.c - position management.
  *
- * Copyright (C) 2021 Bruno Raoult ("br")
+ * Copyright (C) 2021-2024 Bruno Raoult ("br")
  * Licensed under the GNU General Public License v3.0 or later.
  * Some rights reserved. See COPYING.
  *
@@ -16,213 +16,50 @@
 #include <stdbool.h>
 #include <string.h>
 #include <ctype.h>
+#include <assert.h>
+
+#include "brlib.h"
+#include "bitops.h"
 
 #include "chessdefs.h"
 #include "position.h"
-#include "move.h"
+#include "bitboard.h"
+#include "hyperbola-quintessence.h"
 #include "fen.h"
 #include "piece.h"
-#include "eval.h"
+#include "util.h"
+#include "board.h"
+#include "attack.h"
 
-static pool_t *pos_pool;
-
-#define BYTE_PRINT "%c%c%c%c%c%c%c%c"
-#define BYTE2BIN(b) ((b) & 0x01 ? '1' : '0'),  \
-        ((b) & 0x02 ? '1' : '0'),              \
-        ((b) & 0x04 ? '1' : '0'),              \
-        ((b) & 0x08 ? '1' : '0'),              \
-        ((b) & 0x10 ? '1' : '0'),              \
-        ((b) & 0x20 ? '1' : '0'),              \
-        ((b) & 0x40 ? '1' : '0'),              \
-        ((b) & 0x80 ? '1' : '0')
-
-inline void bitboard_print(bitboard_t bb)
+/**
+ * pos_new() - allocate a new position
+ *
+ * Position is not initialized.
+ * If BUG_ON compilation is defined, the program will fail.
+ *
+ * @Return: The new position or NULL.
+ */
+pos_t *pos_new(void)
 {
-    int i;
-    printf("%#018lx\n", bb);
-    for (i=56; i>=0; i-=8)
-        printf("\t"BYTE_PRINT"\n",
-               BYTE2BIN(bb>>i));
-}
-
-inline void bitboard_print2(bitboard_t bb1, bitboard_t bb2)
-{
-    int i;
-    printf("\tW: %#018lx\tB: %#018lx\n", bb1, bb2);
-    for (i=56; i>=0; i-=8)
-        printf("\t"BYTE_PRINT"\t\t"BYTE_PRINT"\n",
-               BYTE2BIN(bb1>>i),
-               BYTE2BIN(bb2>>i));
+    return safe_malloc(sizeof(pos_t));
 }
 
 /**
- * pos_pieces_print() - Print position pieces
- * @pos:  &position
+ * pos_dup() - duplicate a position.
+ * @pos: &position to duplicate.
+ *
+ * Return a copy, allocated with malloc(1), of @pos.
+ *
+ * @Return: The new position.
+ *
+ * TODO: merge with pos_new - NULL for init, non null for duplicate
  */
-void pos_pieces_print(pos_t *pos)
+pos_t *pos_dup(const pos_t *pos)
 {
-    printf("White pieces (%d): \t", popcount64(pos->occupied[WHITE]));
-    piece_list_print(&pos->pieces[WHITE]);
-    printf("Black pieces (%d): \t", popcount64(pos->occupied[BLACK]));
-    piece_list_print(&pos->pieces[BLACK]);
-}
+    pos_t *newpos = safe_malloc(sizeof(pos_t));
 
-/**
- * pos_bitboards_print() - Print position bitboards
- * @pos:  &position
- */
-void pos_bitboards_print(pos_t *pos)
-{
-    printf("Bitboards occupied :\n");
-    bitboard_print2(pos->occupied[WHITE], pos->occupied[BLACK]);
-    printf("Bitboards controlled :\n");
-    bitboard_print2(pos->controlled[WHITE], pos->controlled[BLACK]);
-
-}
-
-/**
- * pos_print() - Print position on stdout.
- * @pos:  &position
- */
-void pos_print(pos_t *pos)
-{
-    int rank, file;
-    piece_t piece;
-    board_t *board = pos->board;
-    piece_list_t *wk = list_first_entry(&pos->pieces[WHITE], piece_list_t, list),
-        *bk = list_first_entry(&pos->pieces[BLACK], piece_list_t, list);
-
-
-    printf("  +---+---+---+---+---+---+---+---+\n");
-    for (rank = 7; rank >= 0; --rank) {
-        printf("%c |", rank + '1');
-        for (file = 0; file < 8; ++file) {
-            piece = board[SQ88(file, rank)].piece;
-            printf(" %s |", P_CSYM(piece));
-        }
-        printf("\n  +---+---+---+---+---+---+---+---+\n");
-    }
-    printf("    A   B   C   D   E   F   G   H\n\n");
-    printf("Turn: %s.\n", IS_WHITE(pos->turn) ? "white" : "black");
-    printf("Kings: W:%c%c B:%c%c\n",
-           FILE2C(F88(wk->square)),
-           RANK2C(R88(wk->square)),
-           FILE2C(F88(bk->square)),
-           RANK2C(R88(bk->square)));
-    printf("Possible en-passant: [%#x] ", pos->en_passant);
-    if (pos->en_passant == 0)
-        printf("None.\n");
-    else
-        printf("%d %d = %c%c\n",
-               F88(pos->en_passant),
-               R88(pos->en_passant),
-               FILE2C(F88(pos->en_passant)),
-               RANK2C(R88(pos->en_passant)));
-
-    printf("castle [%#x] : ", pos->castle);
-
-    if (pos->castle & CASTLE_WK)
-        printf("K");
-    if (pos->castle & CASTLE_WQ)
-        printf("Q");
-    if (pos->castle & CASTLE_BK)
-        printf("k");
-    if (pos->castle & CASTLE_BQ)
-        printf("q");
-
-    printf("\n50 half-moves-rule = %d\n", pos->clock_50);
-    printf("Current move = %d\n", pos->curmove);
-    printf("Squares controlled: W:%d B:%d\n", popcount64(pos->controlled[WHITE]),
-           popcount64(pos->controlled[BLACK]));
-    printf("Mobility: W:%u B:%u\n", pos->mobility[WHITE],
-           pos->mobility[BLACK]);
-}
-
-/**
- * pos_check() - extensive position consistenci check.
- * @pos:  &position
- */
-void pos_check(pos_t *pos)
-{
-    int rank, file;
-    piece_t piece;
-    board_t *board = pos->board;
-
-    /* check that board and bitboard reflect same information */
-    for (rank = 7; rank >= 0; --rank) {
-        for (file = 0; file < 8; ++file) {
-            piece_list_t *ppiece;
-            printf("checking %c%c ", file+'a', rank+'1');
-
-            piece = board[SQ88(file, rank)].piece;
-            ppiece= board[SQ88(file, rank)].s_piece;
-            printf("piece=%s ", P_CSYM(piece));
-            if (ppiece)
-                printf("ppiece=%s/sq=%#x ", P_CSYM(ppiece->piece), ppiece->square);
-            switch(PIECE(piece)) {
-                case PAWN:
-                    printf("pawn" );
-                    break;
-                case KNIGHT:
-                    printf("knight ");
-                    break;
-                case BISHOP:
-                    printf("bishop ");
-                    break;
-                case ROOK:
-                    printf("rook ");
-                    break;
-                case QUEEN:
-                    printf("queen ");
-                    break;
-                case KING:
-                    printf("king ");
-                    break;
-            }
-            printf("\n");
-        }
-    }
-}
-
-pos_t *pos_clear(pos_t *pos)
-{
-    int file, rank;
-    board_t *board = pos->board;
-
-    for (file = 0; file < 8; ++file) {
-        for (rank = 0; rank < 8; ++rank) {
-            /*printf("file = %d rank = %d SQ88 = %#2x = %d addr=%p\n", file, rank,
-                   SQ88(file, rank), SQ88(file, rank),
-                   &board[SQ88(file, rank)].piece);
-            */
-            board[SQ88(file, rank)].piece = EMPTY;
-        }
-    }
-
-    SET_WHITE(pos->turn);
-    pos->node_count = 0;
-    pos->castle = 0;
-    pos->clock_50 = 0;
-    pos->curmove = 0;
-    pos->eval = 0;
-    pos->en_passant = 0;
-    pos->occupied[WHITE] = 0;
-    pos->occupied[BLACK] = 0;
-    for (int color=0; color<2; ++color)
-        for (int piece = BB_ALL; piece < BB_END; ++piece)
-            pos->bb[color][piece] = 0;
-    pos->controlled[WHITE] = 0;
-    pos->controlled[BLACK] = 0;
-    pos->mobility[WHITE] = 0;
-    pos->mobility[BLACK] = 0;
-    pos->moves_generated = false;
-    pos->moves_counted = false;
-    /* remove pieces / moves */
-    pieces_del(pos, WHITE);
-    pieces_del(pos, BLACK);
-    moves_del(pos);
-
-    return pos;
+    *newpos = *pos;
+    return newpos;
 }
 
 /**
@@ -231,93 +68,403 @@ pos_t *pos_clear(pos_t *pos)
  */
 void pos_del(pos_t *pos)
 {
-    pieces_del(pos, WHITE);
-    pieces_del(pos, BLACK);
-    moves_del(pos);
-    pool_add(pos_pool, pos);
+    safe_free(pos);
 }
 
-pos_t *pos_startpos(pos_t *pos)
+/**
+ * pos_clear() - clear a position.
+ * @pos: &position.
+ *
+ * @return: @pos.
+ */
+pos_t *pos_clear(pos_t *pos)
 {
-    static char *startfen="rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
+#   ifdef DEBUG_POS
+    printf("size(pos_board=%lu elt=%lu\n", sizeof(pos->board), sizeof(int));
+#   endif
+    pos->node_count = 0;
+    pos->turn = WHITE;
 
-    return fen2pos(pos, startfen);
-}
+    /* move_do/undo position state */
+    pos->en_passant = SQUARE_NONE;
+    pos->castle = 0;
+    pos->clock_50 = 0;
+    pos->plycount = 0;
+    //pos->captured = NO_PIECE;
 
-pos_t *pos_get()
-{
-    pos_t *pos = pool_get(pos_pool);
-    if (pos) {
-        INIT_LIST_HEAD(&pos->pieces[WHITE]);
-        INIT_LIST_HEAD(&pos->pieces[BLACK]);
+    for (square_t sq = A1; sq <= H8; ++sq)
+        pos->board[sq] = EMPTY;
 
-        INIT_LIST_HEAD(&pos->moves[WHITE]);
-        INIT_LIST_HEAD(&pos->moves[BLACK]);
-        pos_clear(pos);
-    } else {
-        fprintf(stderr, "zobaaa\n");
+    for (color_t color = WHITE; color <= BLACK; ++color) {
+        for (piece_type_t piece = 0; piece <= KING; ++piece)
+            pos->bb[color][piece] = 0;
+        //pos->controlled[color] = 0;
+        pos->king[color] = SQUARE_NONE;
     }
+
+    pos->checkers = 0;
+    pos->pinners = 0;
+    pos->blockers = 0;
+
+    //pos->moves.nmoves = 0;
     return pos;
 }
 
 /**
- * pos_dup() - duplicate a position.
- * @pos: &position to duplicate.
+ * pos_cmp() - compare two positions..
+ * @pos1, @pos2: The two &position.
  *
- * New position is the same as source one (with duplicated pieces list),
- * except:
- * - moves list is empty
- * - bestmove is NULL
- * - nodecount is set to zero
- * - eval is set to EVAL_INVALID
- * - moves_generated ans moves_counted are unset
- * - check is set to zero
- *
- * @return: The new position.
- *
- * TODO: merge with pos_get - NULL for init, non null for duplicate
+ * @return: true if equal, false otherwise.
  */
-pos_t *pos_dup(pos_t *pos)
+bool pos_cmp(__unused const pos_t *pos1, __unused const pos_t *pos2)
 {
-    struct list_head *p_cur, *piece_list;
-    piece_list_t *oldpiece;
-    board_t *board;
-    pos_t *new = pool_get(pos_pool);
+#define _cmpf(a) (pos1->a != pos2->a)
+    bool ret = false;
+    if (warn_on(_cmpf(node_count)))
+        goto end;
+    if (warn_on(_cmpf(turn)))
+        goto end;
 
-    if (new) {
-        board = new->board;
-        *new = *pos;
-        for (int color = 0; color < 2; ++color) {
-            INIT_LIST_HEAD(&new->pieces[color]);
-            INIT_LIST_HEAD(&new->moves[color]);
-            /* duplicate piece list */
-            piece_list = &pos->pieces[color];     /* white/black piece list */
+    /* move_do/undo position state */
+    if (warn_on(_cmpf(en_passant)))
+        goto end;
+    if (warn_on(_cmpf(castle)))
+        goto end;
+    if (warn_on(_cmpf(clock_50)))
+        goto end;
+    if (warn_on(_cmpf(plycount)))
+        goto end;
+    //if (warn_on(_cmpf(captured)))
+    //    goto end;
 
-            list_for_each(p_cur, piece_list) {
-                oldpiece = list_entry(p_cur, piece_list_t, list);
-                board[oldpiece->square].s_piece =
-                    piece_add(new, oldpiece->piece, oldpiece->square);
-            }
-        }
-        new->bestmove = NULL;
-        new->node_count = 0;
-        new->eval = EVAL_INVALID;
-        new->moves_generated = false;
-        new->moves_counted = false;
-        new->check[WHITE] = new->check[BLACK] = 0;
+    for (square_t sq = A1; sq <= H8; ++sq)
+        if (warn_on(_cmpf(board[sq])))
+            goto end;
+
+    for (color_t color = WHITE; color <= BLACK; ++color) {
+        for (piece_type_t piece = 0; piece <= KING; ++piece)
+            if (warn_on(_cmpf(bb[color][piece])))
+                goto end;
+        //pos->controlled[color] = 0;
+        if (warn_on(_cmpf(king[color])))
+            goto end;
     }
-    return new;
+
+    if (warn_on(_cmpf(checkers)))
+        goto end;
+    if (warn_on(_cmpf(pinners)))
+        goto end;
+    if (warn_on(_cmpf(blockers)))
+        goto end;
+
+    /*
+     * if (warn_on(_cmpf(moves.nmoves)))
+     *     goto end;
+     * for (int i = 0; i < pos1->moves.nmoves; ++i)
+     *     if (warn_on(_cmpf(moves.move[i])))
+     *         goto end;
+     */
+
+    ret = true;
+end:
+    return ret;
+#undef _cmpf
 }
 
-pool_t *pos_pool_init()
+/**
+ * pos_checkers() - find all checkers on a king.
+ * @pos:   &position
+ * @color: king color
+ *
+ * Get a bitboard of all checkers on @color king.
+ * Just a wrapper over @sq_attackers().
+ *
+ * @return: a bitboard of attackers.
+ */
+bitboard_t pos_checkers(const pos_t *pos, const color_t color)
 {
-    if (!pos_pool)
-        pos_pool = pool_create("positions", 128, sizeof(pos_t));
-    return pos_pool;
+    bitboard_t occ = pos_occ(pos);
+    return sq_attackers(pos, occ, pos->king[color], OPPONENT(color));
 }
 
-void pos_pool_stats()
+/**
+ * pos_set_checkers_pinners_blockers() - calculate checkers, pinners and blockers.
+ * @pos:   &position
+ *
+ * Set position checkers, pinners and blockers on player-to-play king.
+ * It should be faster than @pos_checkers + @pos_set_pinners_blockers, as
+ * some calculation will be done once.
+ */
+void pos_set_checkers_pinners_blockers(pos_t *pos)
 {
-    if (pos_pool)
-        pool_stats(pos_pool);
+    int us = pos->turn, them = OPPONENT(us);
+    bitboard_t occ = pos_occ(pos);
+    bitboard_t attackers;
+    bitboard_t checkers = 0, blockers = 0, pinners = 0;
+    bitboard_t targets, tmpcheckers, maybeblockers, tmppinners;
+    square_t king = pos->king[us];
+    int pinner;
+
+    /* bishop type - we attack with a bishop from king position */
+    attackers = pos->bb[them][BISHOP] | pos->bb[them][QUEEN];
+
+    /* targets is all "target" pieces if K was a bishop */
+    targets = hyperbola_bishop_moves(occ, king) & occ;
+
+    /* checkers = only opponent B/Q */
+    tmpcheckers = targets & attackers;
+    checkers |= tmpcheckers;
+
+    /* maybe blockers = we remove checkers, to look "behind" */
+    maybeblockers = targets & ~tmpcheckers;
+
+    /* we find second targets, by removing first ones (excl. checkers) */
+    if (maybeblockers) {
+        targets = hyperbola_bishop_moves(occ ^ maybeblockers, king) ^ tmpcheckers;
+
+        /* pinners = only B/Q */
+        tmppinners = targets & attackers;
+
+        /* blockers = we find occupied squares between pinner and king */
+        while (tmppinners) {
+            pinner = bb_next(&tmppinners);
+            pinners |= mask(pinner);
+            blockers |= bb_between[pinner][king] & maybeblockers;
+        }
+    }
+
+    /* same for rook type */
+    attackers = pos->bb[them][ROOK] | pos->bb[them][QUEEN];
+    targets = hyperbola_rook_moves(occ, king) & occ;
+
+    tmpcheckers = targets & attackers;
+    checkers |= tmpcheckers;
+
+    maybeblockers = targets & ~tmpcheckers;
+    if (maybeblockers) {
+        targets = hyperbola_rook_moves(occ ^ maybeblockers, king) ^ tmpcheckers;
+        tmppinners = targets & attackers;
+        while (tmppinners) {
+            pinner = bb_next(&tmppinners);
+            pinners |= mask(pinner);
+            blockers |= bb_between[pinner][king] & maybeblockers;
+        }
+    }
+
+    /* pawns & knights */
+    checkers |= bb_pawn_attacks[us][king] & pos->bb[them][PAWN];
+    checkers |= bb_knight[king] & pos->bb[them][KNIGHT];
+
+    pos->checkers = checkers;
+    pos->pinners = pinners;
+    pos->blockers = blockers;
+}
+
+/**
+ * pos_set_pinners_blockers() - set position pinners and blockers.
+ * @pos:   &position
+ *
+ * set position pinners and blockers on player-to-play king.
+ */
+void pos_set_pinners_blockers(pos_t *pos)
+{
+    color_t color = pos->turn;
+    square_t king = pos->king[color];
+    bitboard_t tmp, occ = pos_occ(pos), blockers = 0;
+    int pinner;
+
+    pos->pinners = sq_pinners(pos, king, OPPONENT(pos->turn));
+    bit_for_each64(pinner, tmp, pos->pinners) {
+        //bitboard_t blocker =
+        // warn_on(popcount64(blocker) != 1);
+        blockers |= bb_between_excl[pinner][king] & occ;
+    }
+    pos->blockers = blockers;
+    return;
+}
+
+/**
+ * pos_king_pinners() - get the "pinners" on a king "pinners".
+ * @pos:   &position
+ * @color: king color.
+ *
+ * get position "pinners" on @color king. Here, pinner means a piece separated from king
+ * by one piece (any color) only.
+ * This is just a wrapper over @sq_pinners().
+ *
+ * @return: pinners bitboard.
+ */
+bitboard_t pos_king_pinners(const pos_t *pos, const color_t color)
+{
+    return sq_pinners(pos, pos->king[color], OPPONENT(pos->turn));
+}
+
+/**
+ * pos_king_blockers() - get the pin blockers on a king.
+ * @pos:   &position
+ * @color: king color.
+ * @pinners: pinners bitboard.
+ *
+ * get @pinners blockers pieces on @color king.
+ *
+ * @return: blockers bitboard.
+ */
+bitboard_t pos_king_blockers(const pos_t *pos, const color_t color, const bitboard_t pinners)
+{
+    bitboard_t tmp, blockers = 0, occ = pos_occ(pos);
+    square_t pinner, king = pos->king[color];
+
+    bit_for_each64(pinner, tmp, pinners) {
+        //warn_on(popcount64(blocker) != 1);
+        //if (popcount64(blocker) != 1) {
+        //    printf("n blockers = %d\n", popcount64(blocker));
+        //    bb_print("blockers", blocker);
+        //}
+        blockers |= bb_between_excl[pinner][king] & occ;
+    }
+    return blockers;
+}
+
+/**
+ * pos_ok() - extensive position consistency check.
+ * @pos:    &position
+ * @strict: if true, call bug_on() on any error.
+ *
+ * Perform some validity check on position @pos:
+ * - pawns on 1st or 8th rank
+ * - number of pawns > 8 (per color)
+ * - total number of pieces > 16 or zero (per color)
+ * - number of kings != 1 (per color)
+ * - discrepancy between board and king (per color)
+ * - discrepancy between piece bitboards and ALL_PIECES bitboards (per color)
+ * - discrepancy between bitboards and board (per color)
+ * - side-to-move already checking opponent king
+ * - side-to-move in check more than twice
+ * - kings distance is 1
+ *
+ * In case of errors, and @strict is true, @bug_on() is called, and program will
+ * be terminated.
+ * This function should be called with @strict == false during initialization phase
+ * (eg after fen parsing), and with @strict == true otherwise (as we have some data
+ * corruption).
+ *
+ * TODO: add more checks:
+ * - kings attacking each other
+ *
+ * @return: (if @strict is false) return true if check is ok, false otherwise.
+ */
+bool pos_ok(__unused const pos_t *pos, __unused const bool strict)
+{
+    int n, count = 0, bbcount = 0, error = 0;
+    __unused bitboard_t tmp;
+
+    /* pawns on 1st ot 8th rank */
+    tmp = (pos->bb[WHITE][PAWN] | pos->bb[BLACK][PAWN]) & (RANK_1bb | RANK_8bb);
+    error += warn_on(tmp);
+
+    for (color_t color = WHITE; color <= BLACK; ++color) {
+        /* pawn count */
+        n = popcount64(pos->bb[color][PAWN]);
+        error += warn_on(n > 8);
+        /* king count */
+        n = popcount64(pos->bb[color][KING]);
+        error += warn_on(n != 1);
+        /* king mismatch with board */
+        error += warn_on(PIECE(pos->board[pos->king[color]]) != KING);
+        /* pieces count */
+        n = popcount64(pos->bb[color][ALL_PIECES]);
+        error += warn_on(n == 0 || n > 16);
+        bbcount += n;
+    }
+    for (square_t sq = 0; sq < 64; ++sq) {
+        piece_t piece = pos->board[sq];
+        __unused bitboard_t match;
+        if (piece == EMPTY)
+            continue;
+        color_t c = COLOR(piece);
+        piece_type_t p = PIECE(piece);
+        match = pos->bb[c][p] & mask(sq);
+        error += warn_on(!match);
+        count++;
+    }
+    /* occupied occupation is different from bitboards */
+    error += warn_on(count != bbcount);
+    /* is opponent already in check ? */
+    error += warn_on(pos_checkers(pos, OPPONENT(pos->turn)));
+    /* is color to play in check more than twice ? */
+    error += warn_on(popcount64(pos_checkers(pos, OPPONENT(pos->turn))) > 2);
+    /* kings distance is less than 2 */
+    error += warn_on(sq_dist(pos->king[WHITE], pos->king[BLACK]) < 2);
+
+    bug_on(strict && error);
+    return error? false: true;
+}
+
+/**
+ * pos_print() - Print position and fen on stdout.
+ * @pos:  &position
+ */
+void pos_print(const pos_t *pos)
+{
+    char str[128];
+
+    board_print(pos->board);
+    printf("fen %s\n", pos2fen(pos, str));
+    printf("checkers: %s\n", pos_checkers2str(pos, str, sizeof(str)));
+    printf("pinners : %s\n", pos_pinners2str(pos, str, sizeof(str)));
+    printf("blockers: %s\n", pos_blockers2str(pos, str, sizeof(str)));
+}
+
+/**
+ * pos_print_mask() - Print position and fen on stdout, with highlighted squares.
+ * @pos:  &position
+ * @mask: mask of highlighted squares.
+ */
+void pos_print_mask(const pos_t *pos, const bitboard_t mask)
+{
+    char fen[92];
+
+    board_print_mask(pos->board, mask);
+    printf("fen %s\n", pos2fen(pos, fen));
+}
+
+/**
+ * pos_print_raw - print simple position board (octal/FEN symbol values)
+ * @bb: the bitboard
+ * @type: int, 0 for octal, 1 for fen symbol
+ */
+void pos_print_raw(const pos_t *pos, const int type)
+{
+    board_print_raw(pos->board, type);
+    return;
+}
+
+/**
+ * pos_print_pieces() - Print position pieces
+ * @pos:  &position
+ */
+void pos_print_pieces(const pos_t *pos)
+{
+    int sq, count, cur;
+    char *pname;
+    u64 tmp;
+    bitboard_t p;
+    for (int color = WHITE; color <= BLACK; ++color) {
+        for (int piece = KING; piece >= PAWN; --piece) {
+            p = pos->bb[color][piece];
+            count = popcount64(p);
+            cur = 0;
+            pname = piece_to_char(p);
+            printf("%s(%d)%s", pname, count, count? ":": "");
+            if (count) {
+                bit_for_each64(sq, tmp, p) {
+                    // char cf = sq_file(bit), cr = sq_rank(bit);
+                    printf("%s%s", cur? ",": "", sq_to_string(sq));
+                    cur++;
+                }
+            }
+            printf(" ");
+        }
+        printf("\n");
+    }
 }

src/position.h

@@ -1,6 +1,6 @@
 /* position.h - position management definitions.
  *
- * Copyright (C) 2021 Bruno Raoult ("br")
+ * Copyright (C) 2021-2024 Bruno Raoult ("br")
  * Licensed under the GNU General Public License v3.0 or later.
  * Some rights reserved. See COPYING.
  *
@@ -15,51 +15,163 @@
 #define POSITION_H
 
 #include <stdint.h>
-#include <pool.h>
-#include <list.h>
-#include <bits.h>
 
-#include "board.h"
+#include "brlib.h"
+#include "bitops.h"
+#include "struct-group.h"
+
 #include "chessdefs.h"
+#include "bitboard.h"
+#include "piece.h"
+#include "move.h"
+#include "board.h"
 
-typedef struct pos_s {
+typedef struct __pos_s {
     u64 node_count;                               /* evaluated nodes */
-    piece_t turn;                                 /* we use only color bit */
-    castle_t castle;
-    u16 clock_50;
-    u16 curmove;
-    eval_t eval;
-    int check[2];
-    int eval_simple_phase;
-    eval_t eval_simple;
-    move_t *bestmove;
-    bool moves_generated;
-    bool moves_counted;
-    board_t board[BOARDSIZE];
+    int turn;                                     /* WHITE or BLACK */
 
-    square_t en_passant;
+    /* data which cannot be recovered by move_undo (like castle_rights, ...),
+     * or would be expensive to recover (checkers, ...)
+     * following data can be accessed either directly, either via "movesave"
+     * structure name.
+     * For example, pos->en_passant and pos->state.en_passant are the same.
+     * This allows a memcpy on this data (to save/restore position state).
+     */
+    struct_group_tagged(state_s, state,
+                        square_t en_passant;
+                        castle_rights_t castle;
+                        u16 clock_50;
+                        u16 plycount;             /* plies so far, start from 1 */
+                        piece_t captured;         /* only for move_undo */
+                        bitboard_t checkers;      /* opponent checkers */
+                        bitboard_t pinners;       /* opponent pinners */
+                        bitboard_t blockers;      /* pieces blocking pin */
+        );
 
-    bitboard_t bb[2][BB_END];                     /* use: pieces[BLACK][BB_PAWN] */
-    bitboard_t occupied[2];                       /* OR of bb[COLOR][x] */
-    bitboard_t controlled[2];
-    u16 mobility[2];
-    struct list_head pieces[2];                   /* pieces list, King is first */
-    struct list_head moves[2];
+    piece_t board[BOARDSIZE];
+    bitboard_t bb[2][PIECE_TYPE_MAX];             /* bb[0][PAWN], bb[1][ALL_PIECES] */
+    //bitboard_t controlled[2];                     /* unsure */
+    square_t king[2];                             /* dup with bb, faster retrieval */
+    //movelist_t moves;
 } pos_t;
 
-void bitboard_print(bitboard_t bb);
-void bitboard_print2(bitboard_t bb1, bitboard_t bb2);
-void pos_pieces_print(pos_t *pos);
-void pos_bitboards_print(pos_t *pos);
-void pos_print(pos_t *pos);
-pos_t *pos_clear(pos_t *pos);
+typedef struct state_s state_t;
+
+#define pos_pinned(p)                  (p->blockers & p->bb[p->turn][ALL_PIECES])
+
+/**
+ * pos_set_sq - unconditionally set a piece on a square
+ * @pos: position
+ * @square: square_t to set
+ * @piece: piece_t to add
+ *
+ * Both position board and bitboards are modified.
+ */
+static __always_inline void pos_set_sq(pos_t *pos, square_t square, piece_t piece)
+{
+    color_t color = COLOR(piece);
+    piece_type_t type = PIECE(piece);
+    pos->board[square] = piece;
+    pos->bb[color][type] |= mask(square);
+    pos->bb[color][ALL_PIECES] |= mask(square);
+    if (type == KING)
+        pos->king[color] = square;
+}
+
+/**
+ * pos_clr_sq - unconditionally remove a piece from square
+ * @pos: position
+ * @square: square_t to clear
+ *
+ * Both position board and bitboards are modified.
+ */
+static __always_inline void pos_clr_sq(pos_t *pos, square_t square)
+{
+    piece_t piece = pos->board[square];
+    piece_type_t type = PIECE(piece);
+    color_t color = COLOR(piece);
+    pos->board[square] = EMPTY;
+    pos->bb[color][type] &= ~mask(square);
+    pos->bb[color][ALL_PIECES] &= ~mask(square);
+    if (type == KING)
+        pos->king[color] = SQUARE_NONE;
+}
+
+/**
+ * pos_occ() - get position occupation (all pieces)
+ * @pos: position
+ *
+ * @return: occupation bitboard.
+ */
+static __always_inline bitboard_t pos_occ(const pos_t *pos)
+{
+    return pos->bb[WHITE][ALL_PIECES] | pos->bb[BLACK][ALL_PIECES];
+}
+
+/**
+ * pos_between_occ() - find occupation between two squares.
+ * @pos:   position
+ * @sq1:   square 1
+ * @sq2:   square 2
+ *
+ * @return: bitboard of @betw if between @sq1 and @sq2.
+ */
+static __always_inline bitboard_t pos_between_occ(const pos_t *pos,
+                                                  const square_t sq1, const square_t sq2)
+{
+    return bb_between_excl[sq1][sq2] & pos_occ(pos);
+}
+
+/**
+ * pos_between_count() - count occupied squares between two squares.
+ * @pos:   position
+ * @sq1:   square 1
+ * @sq2:   square 2
+ *
+ * @return: bitboard of @betw if between @sq1 and @sq2.
+ */
+static __always_inline int pos_between_count(const pos_t *pos,
+                                             const square_t sq1, const square_t sq2)
+{
+    return popcount64(pos_between_occ(pos, sq1, sq2));
+}
+
+/**
+ * pos_checkers2str() - get of string of checkers.
+ * @p:   position
+ * @str:   destination string
+ * @len:   max @str len.
+ *
+ * A wrapper over @bb_sq2str() for checkers bitmap.
+ *
+ * @return: @str.
+ */
+#define pos_checkers2str(p, str, len)  bb_sq2str(p->checkers, str, len)
+#define pos_pinners2str(p, str, len)   bb_sq2str(p->pinners, str, len)
+#define pos_blockers2str(p, str, len)  bb_sq2str(p->blockers, str, len)
+
+//void bitboard_print(bitboard_t bb, char *title);
+//void bitboard_print2(bitboard_t bb1, bitboard_t bb2, char *title);
+
+pos_t *pos_new();
+pos_t *pos_dup(const pos_t *pos);
 void pos_del(pos_t *pos);
-pos_t *pos_startpos(pos_t *pos);
-pos_t *pos_create();
-pool_t *pos_pool_init();
-void pos_pool_stats();
-pos_t *pos_get();
-pos_t *pos_dup(pos_t *pos);
-void pos_check(pos_t *pos);
+pos_t *pos_clear(pos_t *pos);
+bool pos_cmp(const pos_t *pos1, const pos_t *pos2);
+
+void pos_set_checkers_pinners_blockers(pos_t *pos);
+void pos_set_pinners_blockers(pos_t *pos);
+bitboard_t pos_checkers(const pos_t *pos, const color_t color);
+bitboard_t pos_king_pinners(const pos_t *pos, const color_t color);
+bitboard_t pos_king_blockers(const pos_t *pos, const color_t color, const bitboard_t );
+
+bool pos_ok(const pos_t *pos, const bool strict);
+
+void pos_print(const pos_t *pos);
+void pos_print_mask(const pos_t *pos, const bitboard_t mask);
+void pos_print_raw(const pos_t *pos, const int type);
+
+void pos_print_pieces(const pos_t *pos);
+
 
 #endif  /* POSITION_H */

src/search.c

@@ -1,6 +1,6 @@
-/* search.c - search good moves.
+/* search.c - perft + search.
  *
- * Copyright (C) 2023 Bruno Raoult ("br")
+ * Copyright (C) 2023-2024 Bruno Raoult ("br")
  * Licensed under the GNU General Public License v3.0 or later.
  * Some rights reserved. See COPYING.
  *
@@ -11,14 +11,111 @@
  *
  */
 
+#include <stdio.h>
 
-#include <br.h>
-#include <list.h>
-#include "debug.h"
+#include <brlib.h>
 
-#include "move.h"
-#include "eval.h"
+#include "position.h"
+#include "move-gen.h"
+#include "move-do.h"
 #include "search.h"
+#include "attack.h"
+
+/**
+ * perft() - Perform perft on position
+ * @pos:   &position to search
+ * @depth: Wanted depth.
+ * @ply:   perft depth level.
+ *
+ * Run perft on a position. This function displays the available moves at @depth
+ * level for each possible first move, and the total of moves.
+ *
+ * This version uses the algorithm:
+ *    if last depth
+ *      return 1;
+ *    gen pseudo-legal moves
+ *    loop for each legal move
+ *      do-move
+ *      perft (depth -1)
+ *      undo-move
+ *
+ * @return: total moves found at @depth level.
+ */
+u64 perft(pos_t *pos, int depth, int ply)
+{
+    int subnodes, movetmp = 0;
+    u64 nodes = 0;
+    movelist_t pseudo;
+    move_t move;
+    state_t state;
+
+    if (depth == 0)
+        return 1;
+    pseudo.nmoves = 0;
+    pos->checkers = pos_checkers(pos, pos->turn);
+    pos_set_pinners_blockers(pos);
+    state = pos->state;
+
+    pos_gen_pseudomoves(pos, &pseudo);
+    while ((move =  pos_next_legal(pos, &pseudo, &movetmp)) != MOVE_NONE) {
+        move_do(pos, move);
+        subnodes = perft(pos, depth - 1, ply + 1);
+        if (ply == 1) {
+            char movestr[8];
+            printf("%s: %d\n", move_str(movestr, move, 0), subnodes);
+        }
+        nodes += subnodes;
+        move_undo(pos, move);
+        pos->state = state;
+    }
+
+    if (ply == 1)
+        printf("Total: %lu\n", nodes);
+    return nodes;
+}
+
+/**
+ * perft_new_pinners() - Perform perft on position
+ * @pos:   &position to search
+ * @depth: Wanted depth.
+ * @ply:   perft depth level.
+ *
+ * Run perft on a position. This function displays the available moves at @depth
+ * level for each possible first move, and the total of moves.
+ *
+ * @return: total moves found at @depth level.
+ */
+u64 perft_new_pinners(pos_t *pos, int depth, int ply)
+{
+    int subnodes, movetmp = 0;
+    u64 nodes = 0;
+    movelist_t pseudo;
+    move_t move;
+    state_t state;
+
+    if (depth == 0)
+        return 1;
+    pseudo.nmoves = 0;
+    pos_set_checkers_pinners_blockers(pos);
+    state = pos->state;
+
+    pos_gen_pseudomoves(pos, &pseudo);
+    while ((move =  pos_next_legal(pos, &pseudo, &movetmp)) != MOVE_NONE) {
+        move_do(pos, move);
+        subnodes = perft_new_pinners(pos, depth - 1, ply + 1);
+        if (ply == 1) {
+            char movestr[8];
+            printf("%s: %d\n", move_str(movestr, move, 0), subnodes);
+        }
+        nodes += subnodes;
+        move_undo(pos, move);
+        pos->state = state;
+    }
+
+    if (ply == 1)
+        printf("Total: %lu\n", nodes);
+    return nodes;
+}
 
 /**
  * negamax() - search position negamax.
@@ -31,32 +128,34 @@
  *
  * @return: The @pos negamax evaluation.
  */
-eval_t negamax(pos_t *pos, int depth, int color)
-{
-    move_t *move;
-    pos_t *newpos;
-    eval_t best = EVAL_MIN, score;
-
-    pos->node_count++;
-    if (depth == 0) {
-        moves_gen_all_nomoves(pos);
-        score = eval(pos) * color;
-        return score;
-    }
-    moves_gen_all(pos);
-    list_for_each_entry(move, &pos->moves[pos->turn], list) {
-        newpos = move_do(pos, move);
-        score = -negamax(newpos, depth - 1, -color);
-        pos->node_count += newpos->node_count;
-        move->negamax = score;
-        if (score > best) {
-            best = score;
-            pos->bestmove = move;
-        }
-        move_undo(newpos, move);
-    }
-    return best;
-}
+/*
+ * eval_t negamax(pos_t *pos, int depth, int color)
+ * {
+ *     move_t *move;
+ *     pos_t *newpos;
+ *     eval_t best = EVAL_MIN, score;
+ *
+ *     pos->node_count++;
+ *     if (depth == 0) {
+ *         moves_gen_all_nomoves(pos);
+ *         score = eval(pos) * color;
+ *         return score;
+ *     }
+ *     moves_gen_all(pos);
+ *     list_for_each_entry(move, &pos->moves[pos->turn], list) {
+ *         newpos = move_do(pos, move);
+ *         score = -negamax(newpos, depth - 1, -color);
+ *         pos->node_count += newpos->node_count;
+ *         move->negamax = score;
+ *         if (score > best) {
+ *             best = score;
+ *             pos->bestmove = move;
+ *         }
+ *         move_undo(newpos, move);
+ *     }
+ *     return best;
+ * }
+ */
 
 
 /**
@@ -74,74 +173,76 @@ eval_t negamax(pos_t *pos, int depth, int color)
  *
  * @return: The @pos PVS evaluation.
  */
-eval_t pvs(pos_t *pos, int depth, int alpha, int beta, int color)
-{
-    move_t *move;
-    pos_t *newpos;
-    eval_t score = EVAL_INVALID;
-    bool firstchild = true;
-
-    pos->node_count++;
-
-    if (depth == 0) {
-        //return quiesce(p, alpha, beta);           /* leaf node */
-        moves_gen_all_nomoves(pos);
-        score = eval(pos) * color;
-        log_f(2, "Terminal: depth=%d ", depth);
-        log_f(2, "score=%d alpha=%d beta=%d\n", score, alpha, beta);
-        return score;
-    }
-
-    moves_gen_all(pos);
-    //moves_print(pos, M_PR_EVAL);
-    /* do the full search for first child */
-    //move = list_first_entry_or_null(&pos->moves[pos->turn], move_t, list);
-
-    list_for_each_entry(move, &pos->moves[pos->turn], list) {
-        newpos = move_do(pos, move);
-        log(2, "%.*s", 5 - depth, "                ");
-        if (firstchild) {                               /* first child */
-            score = -pvs(newpos, depth - 1, -beta, -alpha, -color);
-            log_f(2, "First child depth=%d move=", depth);
-            //move_print(0, move, 0);
-            log(2, "score=%d alpha=%d beta=%d\n", score, alpha, beta);
-            pos->bestmove = move;
-        } else {
-            /* search with a null window */
-            score = -pvs(newpos, depth - 1, -alpha - 1, -alpha, -color);
-            log_f(2, "Other child depth=%d move=", depth);
-            //move_print(0, move, 0);
-            log_f(2, "score=%d alpha=%d beta=%d ", score, alpha, beta);
-            /* for fail-soft:  if (score > alpha && score < beta) */
-            if (score > alpha) {
-                /* if failed high, do a full re-search */
-                log_f(2, "doing full search.");
-                score = -pvs(newpos, depth - 1, -beta, -alpha, -color);
-            }
-            log(2, "\n");
-        }
-        pos->node_count += newpos->node_count;
-        move_undo(newpos, move);
-        if (score >= beta) {                      /* fail-hard hard beta cut-off */
-            log(2, "%.*s", 5 - depth, "                ");
-            log_f(2, "depth=%d score=%d alpha=%d beta=%d beta cut-off.\n",
-                  depth, score, alpha, beta);
-            return beta;
-        }
-        if (score > alpha) {
-            log(2, "%.*s", 5 - depth, "                ");
-            log_f(2, "depth=%d setting new alpha from %d to %d\n",
-                  depth, alpha, score);
-            alpha = score;
-            pos->bestmove = move;
-        }
-        move->pos = NULL;
-        move->negamax = score;
-        firstchild = false;
-    }
-
-    return alpha;
-}
+/*
+ * eval_t pvs(pos_t *pos, int depth, int alpha, int beta, int color)
+ * {
+ *     move_t *move;
+ *     pos_t *newpos;
+ *     eval_t score = EVAL_INVALID;
+ *     bool firstchild = true;
+ *
+ *     pos->node_count++;
+ *
+ *     if (depth == 0) {
+ *         //return quiesce(p, alpha, beta);           /\* leaf node *\/
+ *         moves_gen_all_nomoves(pos);
+ *         score = eval(pos) * color;
+ *         log_f(2, "Terminal: depth=%d ", depth);
+ *         log_f(2, "score=%d alpha=%d beta=%d\n", score, alpha, beta);
+ *         return score;
+ *     }
+ *
+ *     moves_gen_all(pos);
+ *     //moves_print(pos, M_PR_EVAL);
+ *     /\* do the full search for first child *\/
+ *     //move = list_first_entry_or_null(&pos->moves[pos->turn], move_t, list);
+ *
+ *     list_for_each_entry(move, &pos->moves[pos->turn], list) {
+ *         newpos = move_do(pos, move);
+ *         log(2, "%.*s", 5 - depth, "                ");
+ *         if (firstchild) {                               /\* first child *\/
+ *             score = -pvs(newpos, depth - 1, -beta, -alpha, -color);
+ *             log_f(2, "First child depth=%d move=", depth);
+ *             //move_print(0, move, 0);
+ *             log(2, "score=%d alpha=%d beta=%d\n", score, alpha, beta);
+ *             pos->bestmove = move;
+ *         } else {
+ *             /\* search with a null window *\/
+ *             score = -pvs(newpos, depth - 1, -alpha - 1, -alpha, -color);
+ *             log_f(2, "Other child depth=%d move=", depth);
+ *             //move_print(0, move, 0);
+ *             log_f(2, "score=%d alpha=%d beta=%d ", score, alpha, beta);
+ *             /\* for fail-soft:  if (score > alpha && score < beta) *\/
+ *             if (score > alpha) {
+ *                 /\* if failed high, do a full re-search *\/
+ *                 log_f(2, "doing full search.");
+ *                 score = -pvs(newpos, depth - 1, -beta, -alpha, -color);
+ *             }
+ *             log(2, "\n");
+ *         }
+ *         pos->node_count += newpos->node_count;
+ *         move_undo(newpos, move);
+ *         if (score >= beta) {                      /\* fail-hard hard beta cut-off *\/
+ *             log(2, "%.*s", 5 - depth, "                ");
+ *             log_f(2, "depth=%d score=%d alpha=%d beta=%d beta cut-off.\n",
+ *                   depth, score, alpha, beta);
+ *             return beta;
+ *         }
+ *         if (score > alpha) {
+ *             log(2, "%.*s", 5 - depth, "                ");
+ *             log_f(2, "depth=%d setting new alpha from %d to %d\n",
+ *                   depth, alpha, score);
+ *             alpha = score;
+ *             pos->bestmove = move;
+ *         }
+ *         move->pos = NULL;
+ *         move->negamax = score;
+ *         firstchild = false;
+ *     }
+ *
+ *     return alpha;
+ * }
+ */
 
 /*
  * int negascout (pos_t *pos, int depth, int alpha, int beta )

src/search.h

@@ -1,6 +1,6 @@
 /* search.h - search for perfect move.
  *
- * Copyright (C) 2021 Bruno Raoult ("br")
+ * Copyright (C) 2021-2024 Bruno Raoult ("br")
  * Licensed under the GNU General Public License v3.0 or later.
  * Some rights reserved. See COPYING.
  *
@@ -16,7 +16,11 @@
 
 #include "position.h"
 
-eval_t negamax(pos_t *pos, int depth, int color);
-eval_t pvs(pos_t *pos, int depth, int alpha, int beta, int color);
+//eval_t negamax(pos_t *pos, int depth, int color);
+//eval_t pvs(pos_t *pos, int depth, int alpha, int beta, int color);
+
+u64 perft(pos_t *pos, int depth, int ply);
+u64 perft2(pos_t *pos, int depth, int ply);
+u64 perft_new_pinners(pos_t *pos, int depth, int ply);
 
 #endif  /* SEARCH_H */

src/temp-migration-bitboard/bitboard.c

@@ -0,0 +1,42 @@
+/* bitboard.c - bitboard functions.
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include "br.h"
+#include "bitboard.h"
+
+/*  maps are clockwise from N */
+static char knight_vector[8] = {
+    NORTH*2 + EAST, NORTH + EAST*2, SOUTH + EAST*2, SOUTH*2 + EAST,
+    SOUTH*2 + WEST, SOUTH + WEST*2, NORTH + WEST*2, NORTH*2 + WEST
+};
+static char king_vector[8] = {
+    NORTH, NORTH_EAST, EAST, SOUTH_EAST,
+    SOUTH, SOUTH_WEST, WEST, NORTH_WEST
+};
+
+static u64 knight_attacks[64], king_attacks[64];
+static int zob=0;
+
+void bitboard_init(void)
+{
+    for (int sq = SQ_0; sq < SQ_N; ++sq) {
+        /* knight/king */
+        for (int j = 0; j < 8; ++j) {
+            zob += *knight_attacks + *king_attacks + *knight_vector +
+                *king_vector;
+            //int dest_knight = sq + knight_vector[j];
+            //if ()
+        }
+
+    }
+}

src/temp-migration-bitboard/bitboard.h

@@ -0,0 +1,105 @@
+/* bitboard.h - bitboard definitions.
+ *
+ * Copyright (C) 2021-2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#ifndef BITBOARD_H
+#define BITBOARD_H
+
+#include "br.h"
+#include "chessdefs.h"
+#include "piece.h"
+#include "bitops.h"
+
+#define mask(s)  ( 1ULL << (s) )
+#define C64(const_u64) const_u64##ULL
+
+typedef enum square {
+    A1, B1, C1, D1, E1, F1, G1, H1,
+    A2, B2, C2, D2, E2, F2, G2, H2,
+    A3, B3, C3, D3, E3, F3, G3, H3,
+    A4, B4, C4, D4, E4, F4, G4, H4,
+    A5, B5, C5, D5, E5, F5, G5, H5,
+    A6, B6, C6, D6, E6, F6, G6, H6,
+    A7, B7, C7, D7, E7, F7, G7, H7,
+    A8, B8, C8, D8, E8, F8, G8, H8,
+    SQ_N,
+    SQ_0 = 0
+} square;
+
+typedef enum file {
+    FILE_A, FILE_B, FILE_C, FILE_D, FILE_E, FILE_F, FILE_G, FILE_H,
+    FILE_N,
+    FILE_0 = 0
+} file;
+
+typedef enum rank {
+    RANK_1, RANK_2, RANK_3, RANK_4, RANK_5, RANK_6, RANK_7, RANK_8,
+    RANK_N,
+    RANK_0 = 0
+} rank;
+
+typedef enum sq_bb {
+    //A1 = 0x01ULL, B1 = 0x02ULL, C1 = 1UL <<  2, D1 = 1UL <<  3,
+    //E1 = 1UL <<  4, F1 = 1UL <<  5, G1 = 1UL <<  6, H1 = 1UL <<
+    A1bb = mask(A1), A2bb = mask(A2), A3bb = mask(A3), A4bb = mask(A4),
+    A5bb = mask(A5), A6bb = mask(A6), A7bb = mask(A7), A8bb = mask(A8),
+    B1bb = mask(B1), B2bb = mask(B2), B3bb = mask(B3), B4bb = mask(B4),
+    B5bb = mask(B5), B6bb = mask(B6), B7bb = mask(B7), B8bb = mask(B8),
+    C1bb = mask(C1), C2bb = mask(C2), C3bb = mask(C3), C4bb = mask(C4),
+    C5bb = mask(C5), C6bb = mask(C6), C7bb = mask(C7), C8bb = mask(C8),
+    D1bb = mask(D1), D2bb = mask(D2), D3bb = mask(D3), D4bb = mask(D4),
+    D5bb = mask(D5), D6bb = mask(D6), D7bb = mask(D7), D8bb = mask(D8),
+    E1bb = mask(E1), E2bb = mask(E2), E3bb = mask(E3), E4bb = mask(E4),
+    E5bb = mask(E5), E6bb = mask(E6), E7bb = mask(E7), E8bb = mask(E8),
+    F1bb = mask(F1), F2bb = mask(F2), F3bb = mask(F3), F4bb = mask(F4),
+    F5bb = mask(F5), F6bb = mask(F6), F7bb = mask(F7), F8bb = mask(F8),
+    G1bb = mask(G1), G2bb = mask(G2), G3bb = mask(G3), G4bb = mask(G4),
+    G5bb = mask(G5), G6bb = mask(G6), G7bb = mask(G7), G8bb = mask(G8),
+    H1bb = mask(H1), H2bb = mask(H2), H3bb = mask(H3), H4bb = mask(H4),
+    H5bb = mask(H5), H6bb = mask(H6), H7bb = mask(H7), H8bb = mask(H8),
+} sq_bb;
+
+typedef enum file_bb {
+    FILE_Abb = 0x0101010101010101ULL,
+    FILE_Bbb = 0x0202020202020202ULL,
+    FILE_Cbb = 0x0404040404040404ULL,
+    FILE_Dbb = 0x0808080808080808ULL,
+    FILE_Ebb = 0x1010101010101010ULL,
+    FILE_Fbb = 0x2020202020202020ULL,
+    FILE_Gbb = 0x4040404040404040ULL,
+    FILE_Hbb = 0x8080808080808080ULL,
+} file_bb;
+
+typedef enum rank_bb {
+    RANK_1bb = 0x00000000000000ffULL,
+    RANK_2bb = 0x000000000000ff00ULL,
+    RANK_3bb = 0x0000000000ff0000ULL,
+    RANK_4bb = 0x00000000ff000000ULL,
+    RANK_5bb = 0x000000ff00000000ULL,
+    RANK_6bb = 0x0000ff0000000000ULL,
+    RANK_7bb = 0x00ff000000000000ULL,
+    RANK_8bb = 0xff00000000000000ULL
+} rank_bb;
+
+#define NORTH 8
+#define EAST  1
+#define SOUTH -NORTH
+#define WEST  -EAST
+
+#define NORTH_EAST (NORTH + EAST)
+#define SOUTH_EAST (SOUTH + EAST)
+#define SOUTH_WEST (SOUTH + WEST)
+#define NORTH_WEST (NORTH + WEST)
+
+void bitboard_init(void);
+
+#endif  /* BITBOARD_H */

src/temp-migration-bitboard/board.h

@@ -0,0 +1,80 @@
+/* board.h - board definitions.
+ *
+ * Copyright (C) 2021 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#ifndef BOARD_H
+#define BOARD_H
+
+#include <stdint.h>
+#include "chessdefs.h"
+#include "piece.h"
+
+typedef struct board_s {
+    piece_t piece;
+    piece_list_t *s_piece;
+    //struct list_head *s_piece;
+} board_t;                                        /* 0x88 board */
+#define BOARDSIZE    (8*8*2)
+
+/* definitions for 0x88 representation
+ */
+#define SQ88(f, r)  (((r) << 4) | (f))            /* from rank,file to sq88 */
+#define F88(s)      ((s) & 0x0f)                  /* from sq88 to file */
+#define R88(s)      ((s) >> 4)                    /* from sq88 to rank */
+
+#define SETF88(s, r) ((s) &= 0xf0, (s) |= (r))
+#define SETR88(s, f) ((s) &= 0x0f, (s) |= (f)<<4)
+
+#define SQ88_NOK(s)  ((s) & 0x88)                 /* invalid square */
+#define SQ88_OK(s)   (!SQ88_NOK(s))
+
+/* definitions for bitboard representation
+ */
+#define BB(f, r)     (1ULL << (8 * (r) + (f)))    /* from rank,file to bitboard */
+#define SQ88_2_BB(s) (BB(F88(s), R88(s)))         /* from sq88 to bitboard */
+#define FILEBB(b)    ((b) % 8)                    /* from sq88 to file */
+#define RANKBB(b)    ((b) / 8)                    /* from sq88 to rank */
+
+#define SQ88_NOK(s)  ((s) & 0x88)                 /* invalid square */
+#define SQ88_OK(s)   (!SQ88_NOK(s))
+
+/* piece human notation
+ */
+#define CHAR_EMPTY   ' '
+#define CHAR_PAWN    'P'
+#define CHAR_KNIGHT  'N'
+#define CHAR_BISHOP  'B'
+#define CHAR_ROOK    'R'
+#define CHAR_QUEEN   'Q'
+#define CHAR_KING    'K'
+
+/* from human to machine
+ */
+#define C2FILE(c)    (tolower(c) - 'a')
+#define C2RANK(c)    (tolower(c) - '1')
+/* from machine to human
+ */
+#define FILE2C(f)    ((f) + 'a')
+#define RANK2C(r)    ((r) + '1')
+
+enum x88_square {
+    x88_A1=0x00, x88_B1, x88_C1, x88_D1, x88_E1, x88_F1, x88_G1, x88_H1,
+    x88_A2=0x10, x88_B2, x88_C2, x88_D2, x88_E2, x88_F2, x88_G2, x88_H2,
+    x88_A3=0x20, x88_B3, x88_C3, x88_D3, x88_E3, x88_F3, x88_G3, x88_H3,
+    x88_A4=0x30, x88_B4, x88_C4, x88_D4, x88_E4, x88_F4, x88_G4, x88_H4,
+    x88_A5=0x40, x88_B5, x88_C5, x88_D5, x88_E5, x88_F5, x88_G5, x88_H5,
+    x88_A6=0x50, x88_B6, x88_C6, x88_D6, x88_E6, x88_F6, x88_G6, x88_H6,
+    x88_A7=0x60, x88_B7, x88_C7, x88_D7, x88_E7, x88_F7, x88_G7, x88_H7,
+    x88_A8=0x70, x88_B8, x88_C8, x88_D8, x88_E8, x88_F8, x88_G8, x88_H8,
+};
+
+#endif  /* BOARD_H */

src/temp-migration-bitboard/brchess.c

@@ -0,0 +1,522 @@
+/* brchess.c - main loop.
+ *
+ * Copyright (C) 2021-2023 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+
+#include <err.h>
+#include <stdlib.h>
+#include <string.h>
+#include <readline/readline.h>
+#include <readline/history.h>
+
+#include <br.h>
+#include <list.h>
+#include <debug.h>
+
+#include "brchess.h"
+#include "chessdefs.h"
+#include "board.h"
+#include "piece.h"
+#include "move.h"
+#include "fen.h"
+#include "eval.h"
+#include "eval-simple.h"
+#include "search.h"
+
+struct command {
+    char *name;                                   /* User printable name */
+    int (*func)(pos_t *, char *);                 /* function doing the job */
+    char *doc;                                    /* function doc */
+};
+
+/* readline example inspired by :
+ * - https://thoughtbot.com/blog/tab-completion-in-gnu-readline
+ * - http://web.mit.edu/gnu/doc/html/rlman_2.html
+ */
+char **commands_completion(const char *, int, int);
+char *commands_generator(const char *, int);
+char *escape(const char *);
+int quote_detector(char *, int);
+int execute_line (pos_t *, char *line);
+struct command *find_command (char *);
+char *stripwhite (char *string);
+
+/* The names of functions that actually do the manipulation. */
+int do_help(pos_t *, char*);
+int do_fen(pos_t *, char*);
+int do_init(pos_t *, char*);
+int do_pos(pos_t *, char*);
+int do_genmoves(pos_t *, char*);
+int do_prmoves(pos_t *, char*);
+//int do_prmovepos(pos_t *pos, char *arg);
+int do_prpieces(pos_t *pos, char *arg);
+int do_memstats(pos_t *, char*);
+int do_eval(pos_t *, char*);
+int do_simple_eval(pos_t *, char*);
+int do_move(pos_t *, char*);
+int do_quit(pos_t *, char*);
+int do_debug(pos_t *, char*);
+int do_depth(pos_t *, char*);
+int do_search(pos_t *, char*);
+int do_pvs(pos_t *, char*);
+
+struct command commands[] = {
+    { "help", do_help, "Display this text" },
+    { "?", do_help, "Synonym for 'help'" },
+    { "fen", do_fen, "Set position to FEN" },
+    { "init", do_init, "Set position to normal start position" },
+    { "pos", do_pos, "Print current position" },
+    { "quit", do_quit, "Quit" },
+    { "genmove", do_genmoves, "Generate move list for " },
+    { "prmoves", do_prmoves, "Print position move list" },
+//    { "prmovepos", do_prmovepos, "Print Nth move resulting position" },
+    { "prpieces", do_prpieces, "Print Pieces (from pieces lists)" },
+    { "memstats", do_memstats, "Generate next move list" },
+    { "eval", do_eval, "Eval current position" },
+    { "simple-eval", do_simple_eval, "Simple eval current position" },
+    { "do_move", do_move, "execute nth move on current position" },
+    { "debug", do_debug, "Set log level to LEVEL" },
+    { "depth", do_depth, "Set search depth to N" },
+    { "search", do_search, "Search best move (negamax)" },
+    { "pvs", do_pvs, "Search best move (Principal Variation Search)" },
+    { NULL, (int(*)()) NULL, NULL }
+};
+
+static int done=0;
+static int depth=1;
+
+int brchess(pos_t *pos)
+{
+    char *buffer, *s;
+
+    rl_attempted_completion_function = commands_completion;
+    rl_completer_quote_characters = "'\"";
+    rl_completer_word_break_characters = " ";
+    rl_char_is_quoted_p = &quote_detector;
+
+    while (!done) {
+        buffer = readline("chess> ");
+        if (!buffer)
+            break;
+        /* Remove leading and trailing whitespace from the line.
+         * Then, if there is anything left, add it to the history list
+         * and execute it.
+         */
+        s = stripwhite(buffer);
+
+        if (*s) {
+            add_history(s);
+            execute_line(pos, s);
+        }
+        free(buffer);
+    }
+
+    return 0;
+}
+
+//char **commands_completion(const char *text, int start, int end)
+char **commands_completion(const char *text, __unused int start, __unused int end)
+{
+    rl_attempted_completion_over = 1;
+    return rl_completion_matches(text, commands_generator);
+}
+
+char *commands_generator(const char *text, int state)
+{
+    static int list_index, len;
+    char *name;
+
+    if (!state) {
+        list_index = 0;
+        len = strlen(text);
+    }
+
+    while ((name = commands[list_index++].name)) {
+        if (rl_completion_quote_character) {
+            name = strdup(name);
+        } else {
+            name = escape(name);
+        }
+
+        if (strncmp(name, text, len) == 0) {
+            return name;
+        } else {
+            free(name);
+        }
+    }
+
+    return NULL;
+}
+
+char *escape(const char *original)
+{
+    size_t original_len;
+    size_t i, j;
+    char *escaped, *resized_escaped;
+
+    original_len = strlen(original);
+
+    if (original_len > SIZE_MAX / 2) {
+        errx(1, "string too long to escape");
+    }
+
+    if ((escaped = malloc(2 * original_len + 1)) == NULL) {
+        err(1, NULL);
+    }
+
+    for (i = 0, j = 0; i < original_len; ++i, ++j) {
+        if (original[i] == ' ') {
+            escaped[j++] = '\\';
+        }
+        escaped[j] = original[i];
+    }
+    escaped[j] = '\0';
+
+    if ((resized_escaped = realloc(escaped, j)) == NULL) {
+        free(escaped);
+        resized_escaped = NULL;
+        err(1, NULL);
+    }
+
+    return resized_escaped;
+}
+
+int quote_detector(char *line, int index)
+{
+    return index > 0
+            && line[index - 1] == '\\'
+            &&!quote_detector(line, index - 1);
+}
+
+/* Execute a command line. */
+int execute_line(pos_t *pos, char *line)
+{
+    register int i;
+    struct command *command;
+    char *word;
+
+    /* Isolate the command word. */
+    i = 0;
+    while (line[i] && whitespace(line[i]))
+        i++;
+    word = line + i;
+
+    while (line[i] && !whitespace(line[i]))
+        i++;
+
+    if (line[i])
+        line[i++] = '\0';
+
+    command = find_command(word);
+
+    if (!command) {
+        fprintf(stderr, "%s: Unknown command.\n", word);
+        return -1;
+    }
+
+    /* Get argument to command, if any. */
+    while (whitespace(line[i]))
+        i++;
+
+    word = line + i;
+
+    /* return command number */
+    return (*command->func)(pos, word);
+}
+
+/* Look up NAME as the name of a command, and return a pointer to that
+   command.  Return a NULL pointer if NAME isn't a command name. */
+struct command *find_command(char *name)
+{
+    register int i;
+
+    for (i = 0; commands[i].name; i++)
+        if (strcmp(name, commands[i].name) == 0)
+            return &commands[i];
+
+    return (struct command *)NULL;
+}
+
+/* Strip whitespace from the start and end of STRING.  Return a pointer
+   into STRING. */
+char *stripwhite(char *string)
+{
+    register char *s, *t;
+
+    for (s = string; whitespace(*s); s++)
+        ;
+
+    if (*s == 0)
+        return s;
+
+    t = s + strlen(s) - 1;
+    while (t > s && whitespace(*t))
+        t--;
+    *++t = '\0';
+
+    return s;
+}
+
+int do_eval(__unused pos_t *pos, __unused char *arg)
+{
+    eval_t material[2], control[2], mobility[2];
+    for (int color = WHITE; color <= BLACK; ++color) {
+        material[color] = eval_material(pos, color);
+        control[color] = eval_square_control(pos, color);
+        mobility[color] = eval_mobility(pos, color);
+        printf("%s: material=%d mobility=%d controlled=%d\n",
+               color? "Black": "White", material[color],
+               mobility[color], control[color]);
+    }
+    eval_t res = eval(pos);
+    printf("eval = %d centipawns\n", res);
+    return 1;
+}
+
+int do_simple_eval(__unused pos_t *pos, __unused char *arg)
+{
+    eval_t eval = eval_simple(pos);
+    printf("eval = %d centipawns\n", eval);
+    return 1;
+}
+
+int do_fen(pos_t *pos, char *arg)
+{
+    fen2pos(pos, arg);
+    return 1;
+}
+
+int do_init(pos_t *pos, __unused char *arg)
+{
+    pos_startpos(pos);
+    return 1;
+}
+
+int do_pos(pos_t *pos, __unused char *arg)
+{
+    pos_print(pos);
+    return 1;
+}
+
+int do_genmoves(pos_t *pos, __unused char *arg)
+{
+    moves_gen_all(pos);
+    return 1;
+}
+
+int do_prmoves(pos_t *pos, __unused char *arg)
+{
+    uint debug_level = debug_level_get();
+    debug_level_set(1);
+    moves_print(pos, M_PR_SEPARATE | M_PR_NUM | M_PR_LONG);
+    debug_level_set(debug_level);
+    return 1;
+}
+
+/*
+ * int do_prmovepos(pos_t *pos, char *arg)
+ * {
+ *     struct list_head *p_cur, *tmp;
+ *     int movenum = atoi(arg), cur = 0;             /\* starts with 0 *\/
+ *     move_t *move;
+ *
+ *     log_f(1, "%s\n", arg);
+ *     list_for_each_safe(p_cur, tmp, &pos->moves[pos->turn]) {
+ *         move = list_entry(p_cur, move_t, list);
+ *         if (cur++ == movenum) {
+ *             pos_print(move->newpos);
+ *             break;
+ *         }
+ *     }
+ *
+ *     return 1;
+ * }
+ */
+
+int do_prpieces(pos_t *pos, __unused char *arg)
+{
+    log_f(1, "%s\n", arg);
+    pos_pieces_print(pos);
+    return 1;
+}
+
+int do_memstats(__unused pos_t *pos,__unused char *arg)
+{
+    moves_pool_stats();
+    piece_pool_stats();
+    pos_pool_stats();
+    return 1;
+}
+
+int do_move(__unused pos_t *pos, __unused char *arg)
+{
+    int i = 1, nmove = atoi(arg);
+    move_t *move;
+    pos_t *newpos;
+
+    if (list_empty(&pos->moves[pos->turn])) {
+        log_f(1, "No moves list.\n");
+        return 0;
+    }
+    list_for_each_entry(move, &pos->moves[pos->turn], list) {
+        if (i == nmove)
+            goto doit;
+        i++;
+    }
+    log_f(1, "Invalid <%d> move, should be <1-%d>.\n", nmove, i);
+    return 0;
+doit:
+    newpos = move_do(pos, move);
+    pos_print(newpos);
+
+    return 1;
+}
+
+int do_quit(__unused pos_t *pos, __unused char *arg)
+{
+    return done = 1;
+}
+
+int do_debug(__unused pos_t *pos, __unused char *arg)
+{
+    debug_level_set(atoi(arg));
+    return 1;
+}
+
+/* Print out help for ARG, or for all of the commands if ARG is
+   not present. */
+int do_help(__unused pos_t *pos, __unused char *arg)
+{
+    int i;
+    int printed = 0;
+
+    for (i = 0; commands[i].name; i++) {
+        if (!*arg || (strcmp(arg, commands[i].name) == 0)) {
+            printf("%-11.11s%s.\n", commands[i].name, commands[i].doc);
+            printed++;
+        }
+    }
+
+    if (!printed) {
+        printf("No commands match `%s'.  Possibilties are:\n", arg);
+
+        for (i = 0; commands[i].name; i++) {
+            /* Print in six columns. */
+            if (printed == 6) {
+                printed = 0;
+                printf("\n");
+            }
+
+            printf("%s\t", commands[i].name);
+            printed++;
+        }
+
+        if (printed)
+            printf("\n");
+    }
+    return 0;
+}
+
+int do_depth(__unused pos_t *pos, char *arg)
+{
+    depth = atoi(arg);
+    printf("depth = %d\n", depth);
+    return 1;
+
+}
+
+int do_search(pos_t *pos, __unused char *arg)
+{
+    int debug_level = debug_level_get();
+    float timer1, timer2, nodes_sec;
+
+    timer1 = debug_timer_elapsed();
+    negamax(pos, depth, pos->turn == WHITE ? 1 : -1);
+    timer2 = debug_timer_elapsed();
+    nodes_sec = (float) pos->node_count / ((float) (timer2 - timer1) / (float)NANOSEC);
+    log(1, "best=");
+    debug_level_set(1);
+    move_print(0, pos->bestmove, 0);
+    debug_level_set(debug_level);
+    log(1, " negamax=%d\n", pos->bestmove->negamax);
+    printf("Depth:%d Nodes:%luK time:%.02fs (%.0f kn/s)\n", depth,
+           pos->node_count / 1000, (timer2 - timer1)/NANOSEC, nodes_sec/1000);
+    return 1;
+}
+
+int do_pvs(pos_t *pos, __unused char *arg)
+{
+    int debug_level = debug_level_get();
+    float timer1, timer2, nodes_sec;
+    eval_t _pvs;
+
+    timer1 = debug_timer_elapsed();
+    moves_gen_eval_sort(pos);
+    _pvs = pvs(pos, depth, EVAL_MIN, EVAL_MAX, pos->turn == WHITE ? 1 : -1);
+    timer2 = debug_timer_elapsed();
+    nodes_sec = (float) pos->node_count / ((float) (timer2 - timer1) / (float)NANOSEC);
+    log(1, "best=");
+    if (pos->bestmove) {
+        debug_level_set(1);
+        move_print(0, pos->bestmove, 0);
+        debug_level_set(debug_level);
+        log(1, " pvs=%d stored=%d\n", _pvs, pos->bestmove->negamax);
+    } else {
+        log(1, "<no-best-move>");
+    }
+    printf("Depth:%d Nodes:%luK time:%.02fs (%.0f kn/s)\n", depth,
+           pos->node_count / 1000, (timer2 - timer1)/NANOSEC, nodes_sec/1000);
+    return 1;
+}
+
+/** main()
+ * options:
+ int brchess(pos_t *pos)
+ *
+ */
+static int usage(char *prg)
+{
+    fprintf(stderr, "Usage: %s [-ilw] [file...]\n", prg);
+    return 1;
+}
+
+#include <unistd.h>
+
+int main(int ac, char **av)
+{
+    pos_t *pos;
+    int opt;
+
+    piece_pool_init();
+    moves_pool_init();
+    pos_pool_init();
+    pos = pos_get();
+    debug_init(1, stderr, true);
+    eval_simple_init();
+
+    while ((opt = getopt(ac, av, "d:f:")) != -1) {
+        switch (opt) {
+            case 'd':
+                debug_level_set(atoi(optarg));
+                break;
+            case 'f':
+                fen2pos(pos, optarg);
+                break;
+            default:
+                return usage(*av);
+        }
+    }
+    if (optind < ac)
+        return usage(*av);
+
+    return brchess(pos);
+}

src/temp-migration-bitboard/brchess.h

@@ -1,6 +1,6 @@
-/* pjwhash.c - PJW hash function.
+/* brchess.h - main loop.
  *
- * Copyright (C) 2021-2022 Bruno Raoult ("br")
+ * Copyright (C) 2021-2024 Bruno Raoult ("br")
  * Licensed under the GNU General Public License v3.0 or later.
  * Some rights reserved. See COPYING.
  *
@@ -11,10 +11,11 @@
  *
  */
 
-#define _pjw_inline extern
+#ifndef BRCHESS_H
+#define BRCHESS_H
 
-//#include "bits.h"
-//extern unsigned int  pjwhash (const void* key, uint length);
+#include "position.h"
 
-#include "pjwhash.h"
-#include "pjwhash-inline.h"
+int brchess(pos_t *pos);
+
+#endif  /* BRCHESS_H */

src/temp-migration-bitboard/chessdefs.h

@@ -0,0 +1,129 @@
+/* chessdefs.h - generic chess definitions.
+ *
+ * Copyright (C) 2021 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#ifndef CHESSDEFS_H
+#define CHESSDEFS_H
+
+#include "br.h"
+
+/* piece_t bits structure
+ * MSB 8 7 6 5 4 3 2 1 LSB
+ * 1: color (0 for white)
+ * 2-7: bit set for pawn (2), knight, bishop, rook, queen, king (7)
+ */
+typedef u8 piece_t;
+
+enum {
+    E_EMPTY = 0,
+    E_COLOR,                                      /* LSB */
+    E_PAWN,
+    E_KNIGHT,
+    E_BISHOP,
+    E_ROOK,
+    E_QUEEN,
+    E_KING,
+};
+
+/* pos_t bitboards tables
+ */
+enum {
+    BB_ALL = 0,                                   /* OR of all bitboards */
+    BB_UNUSED,                                    /* future use ? */
+    BB_PAWN = E_PAWN,
+    BB_KNIGHT,
+    BB_BISHOP,
+    BB_ROOK,
+    BB_QUEEN,
+    BB_KING,
+    BB_END
+};
+
+/* piece bitmask in piece_t
+ */
+enum {
+    EMPTY  = 0,
+    PAWN   = 1 << (E_PAWN - 1),                   /* 1<<(2-1) = 0x02 00000010 */
+    KNIGHT = 1 << (E_KNIGHT - 1),                 /* 0x04 00000100 */
+    BISHOP = 1 << (E_BISHOP - 1),                 /* 0x08 00001000 */
+    ROOK   = 1 << (E_ROOK - 1),                   /* 0x10 00010000 */
+    QUEEN  = 1 << (E_QUEEN - 1),                  /* 0x20 00100000 */
+    KING   = 1 << (E_KING - 1),                   /* 0x40 01000000 */
+};
+
+#define PIECETOBB(p)    (ffs64(PIECE(p)))         /* from piece_t to bb piece array */
+
+#define WHITE           0                         /* 0x00 00000000 */
+#define BLACK           1                         /* 0x01 00000001 */
+#define OPPONENT(p)     !(p)
+
+#define MASK_COLOR      0x01                      /* 00000001 */
+#define MASK_PIECE      0x7E                      /* 01111110 */
+
+#define COLOR(p)        ((p) & MASK_COLOR)        /* bitmask */
+#define PIECE(p)        ((p) & MASK_PIECE)
+#define E_PIECE(p)      (ffs64(PIECE(p)))         /* convert mask to E_XX */
+
+#define IS_WHITE(p)     (!COLOR(p))
+#define IS_BLACK(p)     (COLOR(p))
+
+#define SET_WHITE(p)    ((p) &= ~MASK_COLOR)
+#define SET_BLACK(p)    ((p) |= MASK_COLOR)
+#define SET_COLOR(p, c) (!(c)? SET_WHITE(p): SET_BLACK(p))
+
+/* flip a 0-63 square:
+ * Vertical:   G8 (62) becomes G1 (6)
+ * Horizontal: G8 (62) becomes B8 (57)
+ */
+#define FLIP_V(sq)      ((sq) ^ 56)
+#define FLIP_H(sq)      ((sq) ^ 7)
+/* square_t bits structure : rrrrffff
+ * ffff: file
+ * rrrr: rank
+ */
+typedef uchar square_t;
+
+/* castle_t bits structure
+ */
+typedef unsigned char castle_t;
+
+#define CASTLE_WK       (1 << 0)                  /* 0x01 00000001 */
+#define CASTLE_WQ       (1 << 1)                  /* 0x02 00000010 */
+#define CASTLE_BK       (1 << 2)                  /* 0x04 00000100 */
+#define CASTLE_BQ       (1 << 3)                  /* 0x08 00001000 */
+
+#define CASTLE_W        (CASTLE_WK | CASTLE_WQ)   /* 00000011 W castle mask */
+#define CASTLE_B        (CASTLE_BK | CASTLE_BQ)   /* 00001100 B castle mask */
+
+/* game phases
+ */
+#define OPENING    0
+#define MIDDLEGAME 1
+#define ENDGAME    2
+
+/* bitboard
+ */
+typedef u64 bitboard_t;
+
+
+/* eval type
+ */
+typedef s32 eval_t;
+
+/* forward typedefs
+ */
+typedef struct piece_list_s piece_list_t;
+typedef struct board_s board_t;
+typedef struct pos_s pos_t;
+typedef struct move_s move_t;
+
+#endif

src/temp-migration-bitboard/eval-simple.c

@@ -0,0 +1,199 @@
+/* eval-simple.c - simple position evaluation.
+ *
+ * Copyright (C) 2023 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include "br.h"
+#include "debug.h"
+
+#include "piece.h"
+#include "eval-simple.h"
+#include "position.h"
+
+/*
+ * Tables are from https://www.chessprogramming.org/Simplified_Evaluation_Function
+ *
+ * Attention! Tables are black point of view (to be visually easier to read).
+ */
+
+static int mg_pawn[] = {
+    0,   0,   0,   0,   0,   0,  0,  0,
+    50, 50,  50,  50,  50,  50, 50, 50,
+    10, 10,  20,  30,  30,  20, 10, 10,
+    5,   5,  10,  25,  25,  10,  5,  5,
+    0,   0,   0,  20,  20,   0,  0,  0,
+    5,  -5, -10,   0,   0, -10, -5,  5,
+    5,  10,  10, -20, -20,  10, 10,  5,
+    0,   0,   0,   0,   0,   0,  0,  0
+};
+
+static int mg_knight[] = {
+    -50, -40, -30, -30, -30, -30, -40, -50,
+    -40, -20,   0,   0,   0,   0, -20, -40,
+    -30,   0,  10,  15,  15,  10,   0, -30,
+    -30,   5,  15,  20,  20,  15,   5, -30,
+    -30,   0,  15,  20,  20,  15,   0, -30,
+    -30,   5,  10,  15,  15,  10,   5, -30,
+    -40, -20,   0,   5,   5,   0, -20, -40,
+    -50, -40, -30, -30, -30, -30, -40, -50
+};
+
+static int mg_bishop[] = {
+    -20, -10, -10, -10, -10, -10, -10, -20,
+    -10,   0,   0,   0,   0,   0,   0, -10,
+    -10,   0,   5,  10,  10,   5,   0, -10,
+    -10,   5,   5,  10,  10,   5,   5, -10,
+    -10,   0,  10,  10,  10,  10,   0, -10,
+    -10,  10,  10,  10,  10,  10,  10, -10,
+    -10,   5,   0,   0,   0,   0,   5, -10,
+    -20, -10, -10, -10, -10, -10, -10, -20
+};
+
+static int mg_rook[] = {
+    0,   0,  0,  0,  0,  0,  0,  0,
+    5,  10, 10, 10, 10, 10, 10,  5,
+    -5,  0,  0,  0,  0,  0,  0, -5,
+    -5,  0,  0,  0,  0,  0,  0, -5,
+    -5,  0,  0,  0,  0,  0,  0, -5,
+    -5,  0,  0,  0,  0,  0,  0, -5,
+    -5,  0,  0,  0,  0,  0,  0, -5,
+    0,   0,  0,  5,  5,  0,  0,  0
+};
+
+static int mg_queen[] = {
+    -20, -10, -10, -5, -5, -10, -10, -20,
+    -10,   0,   0,  0,  0,   0,   0, -10,
+    -10,   0,   5,  5,  5,   5,   0, -10,
+    -5,    0,   5,  5,  5,   5,   0,  -5,
+    0,     0,   5,  5,  5,   5,   0,  -5,
+    -10,   5,   5,  5,  5,   5,   0, -10,
+    -10,   0,   5,  0,  0,   0,   0, -10,
+    -20, -10, -10, -5, -5, -10, -10, -20
+};
+
+static int mg_king[] = {
+    -30, -40, -40, -50, -50, -40, -40, -30,
+    -30, -40, -40, -50, -50, -40, -40, -30,
+    -30, -40, -40, -50, -50, -40, -40, -30,
+    -30, -40, -40, -50, -50, -40, -40, -30,
+    -20, -30, -30, -40, -40, -30, -30, -20,
+    -10, -20, -20, -20, -20, -20, -20, -10,
+    20,  20,   0,   0,   0,   0,  20,  20,
+    20,  30,  10,   0,   0,  10,  30,  20
+};
+
+static int eg_king[] = {
+    -50, -40, -30, -20, -20, -30, -40, -50,
+    -30, -20, -10,   0,   0, -10, -20, -30,
+    -30, -10,  20,  30,  30,  20, -10, -30,
+    -30, -10,  30,  40,  40,  30, -10, -30,
+    -30, -10,  30,  40,  40,  30, -10, -30,
+    -30, -10,  20,  30,  30,  20, -10, -30,
+    -30, -30,   0,   0,   0,   0, -30, -30,
+    -50, -30, -30, -30, -30, -30, -30, -50
+};
+
+/* as pieces bitboard tables start at position 2; we make these tables
+ * bigger.
+ */
+static int *mg_tables[] = {
+    NULL,
+    NULL,
+    mg_pawn,
+    mg_knight,
+    mg_bishop,
+    mg_rook,
+    mg_queen,
+    mg_king
+};
+
+static int *eg_tables[] = {
+    NULL,
+    NULL,
+    mg_pawn,
+    mg_knight,
+    mg_bishop,
+    mg_rook,
+    mg_queen,
+    eg_king
+};
+
+/* to flip vertically a square, we need to XOR it with 56
+ */
+static int mg_table[2][6 + 2][64];
+static int eg_table[2][6 + 2][64];
+
+void eval_simple_init(void)
+{
+#   ifdef DEBUG_EVAL
+    log_f(1, "initializing piece tables\n");
+#   endif
+    for (int piece = BB_PAWN; piece <= BB_KING; ++piece) {
+        for (int square = 0; square < 64; ++square) {
+            mg_table[WHITE][piece][square] = mg_tables[piece][FLIP_V(square)];
+            eg_table[WHITE][piece][square] = eg_tables[piece][FLIP_V(square)];
+            mg_table[BLACK][piece][square] = mg_tables[piece][square];
+            eg_table[BLACK][piece][square] = eg_tables[piece][square];
+        }
+    }
+}
+
+/**
+ * eval_simple() - simple and fast position evaluation
+ * @pos: &position to evaluate
+ *
+ * This function is normally used only during initialization,
+ * or when changing phase (middlegame <--> endgame), as the eval
+ * will be done increntally when doing moves.
+ *
+ * @return: the @pos evaluation in centipawns
+ */
+eval_t eval_simple(pos_t *pos)
+{
+    eval_t eval[2] = { 0, 0 };
+    int eg = simple_is_endgame(pos);
+    int (*gg)[6 + 2][64]= eg? eg_table: mg_table;
+
+    pos->eval_simple_phase = ENDGAME;
+#   ifdef DEBUG_EVAL
+    log_f(5, "phase = %s.\n", eg? "endgame": "midgame");
+#   endif
+
+    for (int color = WHITE; color <= BLACK; ++color) {
+        for (uint piece = PAWN; piece <= KING; piece <<= 1) {
+            int bb = PIECETOBB(piece), cur;
+            u64 _t;
+
+#           ifdef DEBUG_EVAL
+            log_f(5, "p=%u bb=%d %s %s: count=%d val=%ld ", piece, bb, color? "black": "white",
+                  P_SYM(piece), popcount64(pos->bb[color][bb]),
+                  popcount64(pos->bb[color][bb]) * P_VALUE(piece));
+#           endif
+
+            eval[color] += popcount64(pos->bb[color][bb]) * P_LETTER(piece);
+            bit_for_each64(cur, _t, pos->bb[color][bb]) {
+#               ifdef DEBUG_EVAL
+                log(5, "sq=%d:%d ", cur, gg[color][bb][cur]);
+#               endif
+                eval[color] += gg[color][bb][cur];
+            }
+#           ifdef DEBUG_EVAL
+            log(5, "\n");
+#           endif
+        }
+    }
+#   ifdef DEBUG_EVAL
+    log_f(2, "eval:%d white:%d black:%d\n", eval[WHITE] - eval[BLACK],
+          eval[WHITE], eval[BLACK]);
+#   endif
+
+    return eval[WHITE] - eval[BLACK];
+}

src/temp-migration-bitboard/eval-simple.h

@@ -0,0 +1,47 @@
+/* eval-simple.h - simple position evaluation.
+ *
+ * Copyright (C) 2021 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#ifndef EVAL_SIMPLE_H
+#define EVAL_SIMPLE_H
+
+
+#include "chessdefs.h"
+
+/* no queen on board */
+#define simple_no_queen(p, c)              \
+    ( !(p)->bb[c][BB_QUEEN] )
+
+#define simple_one_queen(p, c)             \
+    ( popcount64((p)->bb[c][BB_QUEEN]) == 1 )
+
+#define simple_no_rook(p, c)               \
+    (!(p)->bb[c][BB_ROOK])
+
+#define simple_one_minor_piece(p, c)       \
+    (popcount64((p)->bb[c][BB_KNIGHT] | (p)->bb[c][BB_BISHOP]) == 1)
+
+#define simple_is_endgame(p)                  \
+    ( (simple_no_queen(p, WHITE)   ||         \
+       (simple_one_queen(p, WHITE) &&         \
+        simple_no_rook(p, WHITE)   &&         \
+        simple_one_minor_piece(p, WHITE)))    \
+      &&                                      \
+      (simple_no_queen(p, BLACK)   ||         \
+       (simple_one_queen(p, BLACK) &&         \
+        simple_no_rook(p, BLACK)   &&         \
+        simple_one_minor_piece(p, BLACK))) )
+
+void eval_simple_init(void);
+eval_t eval_simple(pos_t *pos);
+
+#endif  /* EVAL_SIMPLE_H */

src/temp-migration-bitboard/eval.c

@@ -0,0 +1,95 @@
+/* eval.c - static position evaluation.
+ *
+ * Copyright (C) 2021-2023 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stdio.h>
+
+#include <list.h>
+#include <debug.h>
+
+#include "position.h"
+#include "eval.h"
+#include "eval-simple.h"
+
+inline eval_t eval_material(pos_t *pos, bool color)
+{
+    eval_t res = 0;
+
+    /* I need to do something about the king, if it can be potentially taken
+     * if pseudo-moves include a pinned piece on King.
+     */
+    for (uint piece = PAWN; piece < KING; piece <<= 1) {
+        uint bb = PIECETOBB(piece);
+#       ifdef DEBUG_EVAL
+        log_f(2, "color=%u piece=%u bb=%u=%c count=%ul val=%ld\n",
+              color, piece, bb, P_LETTER(piece), popcount64(pos->bb[color][bb]),
+              P_VALUE(piece));
+#       endif
+        /* attention here */
+        res += popcount64(pos->bb[color][bb]) * P_VALUE(piece);
+    }
+    return res;
+}
+
+inline eval_t eval_mobility(pos_t *pos, bool color)
+{
+    return pos->mobility[color];
+}
+
+inline eval_t eval_square_control(pos_t *pos, bool color)
+{
+    return popcount64(pos->controlled[color]);
+}
+
+eval_t eval(pos_t *pos)
+{
+    eval_t simple = 0, control[2] = {0};
+
+    if (pos->eval != EVAL_INVALID)
+        return pos->eval;
+
+    /* 1) pieces value */
+    //material[WHITE] = eval_material(pos, WHITE);
+    //material[BLACK] = eval_material(pos, BLACK);
+    simple = eval_simple(pos);
+
+#   ifdef DEBUG_EVAL
+    log_f(2, "eval_simple=%d\n", simple);
+#   endif
+
+    /* 2) square control: 10 square controls diff = 1 pawn */
+    control[WHITE] = eval_square_control(pos, WHITE);
+    control[BLACK] = eval_square_control(pos, BLACK);
+
+#   ifdef DEBUG_EVAL
+    log_f(2, "square control: W:%d B:%d diff=%d\n",
+          control[WHITE], control[BLACK],
+          (control[WHITE] - control[BLACK]) * 10);
+#   endif
+
+    /* 3) mobility: 10 mobility diff = 1 pawn
+     */
+#   ifdef DEBUG_EVAL
+    log_f(2, "mobility: W:%u B:%u diff=%d\n",
+          pos->mobility[WHITE], pos->mobility[BLACK],
+          (pos->mobility[WHITE] - pos->mobility[BLACK]) * 10);
+#   endif
+
+    eval_t res = simple +
+        (control[WHITE] - control[BLACK]) * 10 +
+        (pos->mobility[WHITE] - pos->mobility[BLACK]) * 10;
+#   ifdef DEBUG_EVAL
+    log_f(2, "eval: %d\n", res);
+#   endif
+    pos->eval = res;
+    return res;
+}

src/temp-migration-bitboard/eval.h

@@ -0,0 +1,37 @@
+/* eval.h - static position evaluation.
+ *
+ * Copyright (C) 2021 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#ifndef EVAL_H
+#define EVAL_H
+
+#include <limits.h>
+
+#include "chessdefs.h"
+#include "piece.h"
+
+/* max pieces eval is KING_VALUE + 9*QUEEN_VALUE + 2*ROOK_VALUE + 2*BISHOP_VALUE
+ *  + 2*KNIGHT_VALUE which around 30000.
+ * We are on secure side with -50000/+50000
+ */
+#define EVAL_MAX     (50000)
+#define EVAL_MIN     (-EVAL_MAX)
+#define EVAL_INVALID INT_MIN
+#define EVAL_MATE    EVAL_MAX
+
+eval_t eval_material(pos_t *pos, bool color);
+eval_t eval_mobility(pos_t *pos, bool color);
+eval_t eval_square_control(pos_t *pos, bool color);
+
+eval_t eval(pos_t *pos);
+
+#endif  /* EVAL_H */

src/temp-migration-bitboard/fen.c

@@ -0,0 +1,175 @@
+/* fen.c - fen notation.
+ *
+ * Copyright (C) 2021 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <ctype.h>
+
+#include <debug.h>
+
+#include "chessdefs.h"
+#include "position.h"
+#include "board.h"
+#include "fen.h"
+#include "piece.h"
+
+/* Starting Position :
+ * rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
+ * After 1.e4 :
+ * rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq e3 0 1
+ * After 1... c5 :
+ * rnbqkbnr/pp1ppppp/8/2p5/4P3/8/PPPP1PPP/RNBQKBNR w KQkq c6 0 2
+ * After 2. Nf3:
+ * rnbqkbnr/pp1ppppp/8/2p5/4P3/5N2/PPPP1PPP/RNBQKB1R b KQkq - 1 2
+ *
+ * 1 : White uppercase
+ * 2 : next move (w or b)
+ * 3 : Castling capabilities: "-" if none, KQ/kq if white/black can castle
+ *     on K or Q side
+ * 4 : en-passant: if pawn just moved 2 squares, indicate target square (e.g.
+ *     for e2-e4 this field is e3)
+ * 5 : half moves since last capture or pawn advance (for 50 moves rule)
+ * 6 : full moves, starts at 1, increments after black move
+ *
+ */
+
+// warning, we expect a valid fen input
+pos_t *fen2pos(pos_t *pos, char *fen)
+{
+    char *p = fen;
+    short rank, file, skip, color, bbpiece;
+    piece_t piece;
+    board_t *board = pos->board;
+#   define SKIP_BLANK(p) for(;*(p) == ' '; (p)++)
+
+    pos_clear(pos);
+    /* 1) get piece placement information
+     */
+    for (rank = 7, file = 0; *p && *p != ' '; ++p) {
+        color = isupper(*p)? WHITE: BLACK;
+        char cp = toupper(*p);
+        switch (cp) {
+            case CHAR_PAWN:
+                bbpiece = BB_PAWN;
+                piece = PAWN;
+                goto set_square;
+            case CHAR_KNIGHT:
+                bbpiece = BB_KNIGHT;
+                piece = KNIGHT;
+                goto set_square;
+            case CHAR_BISHOP:
+                bbpiece = BB_BISHOP;
+                piece = BISHOP;
+                goto set_square;
+            case CHAR_ROOK:
+                bbpiece = BB_ROOK;
+                piece = ROOK;
+                goto set_square;
+            case CHAR_QUEEN:
+                bbpiece = BB_QUEEN;
+                piece = QUEEN;
+                goto set_square;
+            case CHAR_KING:
+                bbpiece = BB_KING;
+                piece = KING;
+                //pos->bb[color][BB_KING] = BB(file, rank);
+                //goto set_square;
+            set_square:
+#               ifdef DEBUG_FEN
+                log_i(5, "f=%d r=%d *p=%c piece=%c color=%d\n",
+                      file, rank, *p, cp, color);
+#               endif
+                pos->bb[color][bbpiece] |= BB(file, rank);
+                pos->occupied[color] |= BB(file, rank);
+                SET_COLOR(piece, color);
+                board[SQ88(file, rank)].piece = piece;
+                board[SQ88(file, rank)].s_piece =
+                    piece_add(pos, piece, SQ88(file, rank));
+                file++;
+                break;
+            case '/':
+                rank--;
+                file = 0;
+                break;
+            default:
+                skip = cp - '0';
+                while (skip--) {
+                    board[SQ88(file++, rank)].piece = EMPTY;
+                }
+        }
+    }
+#   ifdef DEBUG_FEN
+    for (rank = 7; rank >= 0; --rank) {
+        for (file = 0; file < 8; ++file) {
+            log(5, "%02x ", board[SQ88(file, rank)].piece);
+        }
+        log(5, "\n");
+    }
+#   endif
+
+    /* 2) next move color
+     */
+    SKIP_BLANK(p);
+    SET_COLOR(pos->turn, *p == 'w' ? WHITE : BLACK);
+    p++;
+
+    /* 3) castle status
+     */
+    SKIP_BLANK(p);
+    pos->castle = 0;
+    if (*p != '-') {
+        for (; *p && *p != ' '; ++p) {
+            switch (*p) {
+                case 'K':
+                    pos->castle |= CASTLE_WK;
+                    break;
+                case 'k':
+                    pos->castle |= CASTLE_BK;
+                    break;
+                case 'Q':
+                    pos->castle |= CASTLE_WQ;
+                    break;
+                case 'q':
+                    pos->castle |= CASTLE_BQ;
+                    break;
+            }
+        }
+    }
+    p++;
+
+    /* 4) en passant
+     */
+    SKIP_BLANK(p);
+    pos->en_passant = 0;
+    if (*p != '-') {
+        //SET_F(pos->en_passant, C2FILE(*p++));
+        //SET_R(pos->en_passant, C2RANK(*p++));
+        pos->en_passant = SQ88(C2FILE(*p), C2RANK(*(p+1)));
+        pos += 2;
+    } else {
+        p++;
+    }
+
+    /* 5) half moves since last capture or pawn move and
+     * 6) current move number
+     */
+    SKIP_BLANK(p);
+    //log_i(5, "pos=%d\n", (int)(p-fen));
+    sscanf(p, "%hd %hd", &pos->clock_50, &pos->curmove);
+#   ifdef DEBUG_FEN
+    log_i(5, "50 rule=%d current move=%d\n", pos->clock_50, pos->curmove);
+#   endif
+    return pos;
+}

src/temp-migration-bitboard/fen.h

@@ -0,0 +1,21 @@
+/* fen.h - fen notation.
+ *
+ * Copyright (C) 2021 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#ifndef FEN_H
+#define FEN_H
+
+#include "position.h"
+
+pos_t *fen2pos(pos_t *pos, char *fen);
+
+#endif /* FEN_H */

src/temp-migration-bitboard/move.c

@@ -0,0 +1,890 @@
+/* move.c - move management.
+ *
+ * Copyright (C) 2021 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <malloc.h>
+#include <ctype.h>
+
+#include <br.h>
+#include <list.h>
+#include <list_sort.h>
+#include <debug.h>
+
+#include "chessdefs.h"
+#include "board.h"
+#include "bitboard.h"
+#include "piece.h"
+#include "move.h"
+#include "eval.h"
+#include "eval-simple.h"
+
+static pool_t *moves_pool;
+
+static struct vector {
+    unsigned char ndirs;
+    char          slide;
+    char          dir[8];
+} vectors[] = {
+    [KNIGHT] = { 8, 0, { -33, -31, -18, -14, 14,  18,  31, 33 }},
+    [BISHOP] = { 4, 1, { -15, -17, 15,  17 }},
+    [ROOK]   = { 4, 1, { -1,  -16, 1,   16 }},
+    [QUEEN]  = { 8, 1, { -1,  -16, 1,   16,  -15, -17, 15, 17 }},
+    [KING]   = { 8, 0, { -1,  -16, 1,   16,  -15, -17, 15, 17 }}
+};
+
+
+/* squares needed to be empty & not controlled by opponent for castle.
+ * For black castle, same values 7 rows higher (>> 7*8)
+ */
+static struct can_castle {
+    bitboard_t controlled[2];
+    bitboard_t occupied[2];
+} castle_squares[2] = {
+    /*  Queen side      King side           Queen side      King side */
+    { { C1bb|D1bb|E1bb, E1bb|F1bb|G1bb }, { B1bb|C1bb|D1bb, F1bb|G1bb } },
+    { { C8bb|D8bb|E8bb, E8bb|F8bb|G8bb }, { B8bb|C8bb|D8bb, F8bb|G8bb } }
+};
+
+pool_t *moves_pool_init()
+{
+    if (!moves_pool)
+        moves_pool = pool_create("moves", 128, sizeof(move_t));
+    return moves_pool;
+}
+
+void moves_pool_stats()
+{
+    if (moves_pool)
+        pool_stats(moves_pool);
+}
+
+/**
+ * move_print() - print a move
+ * @movenum: move number
+ * @move: &move to display
+ * @flags: options to display
+ *
+ * Possible flags are:
+ * M_PR_CAPT:  print move if capture
+ * M_PR_NCAPT: print move if non capture
+ * M_PR_NUM:   print also move number
+ * M_PR_LONG:  print long notation
+ * M_PR_NL:    print a newline after move
+ * M_PR_EVAL:  print move eval
+ *
+ * @return: 0 if nothing printed, 1 otherwise
+ */
+int move_print(int movenum, move_t *move, move_flags_t flags)
+{
+    if ((flags & M_PR_CAPT) && !(move->flags & M_CAPTURE)) {
+#       ifdef DEBUG_MOVE
+        log_i(9, "skipping capture & %#04x\n", move->flags);
+#       endif
+        return 0;
+    }
+    if ((flags & M_PR_NCAPT) && (move->flags & M_CAPTURE)) {
+#       ifdef DEBUG_MOVE
+        log_i(9, "skipping !capture & %#04x\n", move->flags);
+#       endif
+        return 0;
+    }
+    if (flags & M_PR_NUM)
+        log(1, "%d:", movenum);
+    if (move->flags & M_CASTLE_K) {
+        log(1, "O-O");
+        goto end;
+    } else if (move->flags & M_CASTLE_Q) {
+        log(1, "O-O-O");
+        goto end;
+    } else {
+        log(1, "%s%c%c", P_SYM(move->piece),
+               FILE2C(F88(move->from)),
+               RANK2C(R88(move->from)));
+        if (move->flags & M_CAPTURE) {
+            log(1, "x");
+            if (flags & M_PR_LONG)
+                log(1, "%s", P_SYM(move->capture));
+        } else {
+            log(1, "-");
+        }
+        log(1, "%c%c",
+               FILE2C(F88(move->to)),
+               RANK2C(R88(move->to)));
+        if (flags & M_PR_LONG && move->flags & M_EN_PASSANT)
+            log(1, "e.p.");
+        if (move->promotion)
+            log(1, "=%s", P_SYM(move->promotion));
+        if (flags & M_PR_EVAL)
+            log(1, "[ev:%d] ", move->eval);
+    end:
+        log(1, " ");
+    }
+    if (flags & M_PR_NL)
+        log(1, "\n");
+    return 1;
+}
+
+void moves_print(pos_t *pos, move_flags_t flags)
+{
+    struct list_head *p_cur, *tmp;
+    move_t *move;
+    int movenum;
+
+    for (int color=WHITE; color <= BLACK; ++color) {
+        int verif = 0;
+        log(1, "%s pseudo-moves:\n\t", color == WHITE? "White": "Black");
+        if (! (flags & M_PR_SEPARATE)) {
+            movenum = 1;
+            list_for_each_safe(p_cur, tmp, &pos->moves[color]) {
+                move = list_entry(p_cur, move_t, list);
+                verif += move_print(movenum++, move, flags);
+            }
+        } else {
+            log(1, "captures: ");
+            movenum = 1;
+            list_for_each_safe(p_cur, tmp, &pos->moves[color]) {
+                move = list_entry(p_cur, move_t, list);
+                verif += move_print(movenum++, move, flags | M_PR_CAPT);
+            }
+            movenum = 1;
+            log(1, "\n\tothers  : ");
+            list_for_each_safe(p_cur, tmp, &pos->moves[color]) {
+                move = list_entry(p_cur, move_t, list);
+                verif += move_print(movenum++, move, flags | M_PR_NCAPT);
+            }
+        }
+        log(1, "\n\tTotal moves = %d mobility=%u\n", verif, pos->mobility[color]);
+    }
+}
+
+static move_t *move_add(pos_t *pos, piece_t piece, square_t from,
+                        square_t to)
+{
+    board_t *board = pos->board;
+    move_t *move;
+    int color = COLOR(pos->board[from].piece);
+
+#   ifdef DEBUG_MOVE
+    log_i(3, "piece_color=%d turn=%d from=%c%c to=%c%c\n",
+          color, pos->turn,
+          FILE2C(F88(from)),
+          RANK2C(R88(from)),
+          FILE2C(F88(to)),
+          RANK2C(R88(to)));
+#   endif
+    /* invalid position if opponent king is attacked
+     */
+    if (board[to].piece & KING) {
+#       ifdef DEBUG_MOVE
+        log_i(2, "invalid position: opponent king [%c%c] is in check.\n",
+              FILE2C(F88(to)), RANK2C(R88(to)));
+#       endif
+        return NULL;
+    }
+    if (!(move = pool_get(moves_pool)))
+        return NULL;
+    list_add(&move->list, &pos->moves[color]);
+
+    move->piece = piece | color;
+    move->from = from;
+    move->to = to;
+    move->capture = board[to].piece;
+    if (PIECE(move->capture) == KING)
+        pos->check[color]++;
+
+    move->flags = M_NORMAL;
+    if (move->capture)
+        move->flags |= M_CAPTURE;
+    move->pos = NULL;
+#   ifdef DEBUG_MOVE
+    log_i(3, "added %s %s move from %c%c to %c%c\n",
+          COLOR(move->piece)? "black": "white",
+          P_NAME(PIECE(move->piece)),
+          FILE2C(F88(move->from)), RANK2C(R88(move->from)),
+          FILE2C(F88(move->to)), RANK2C(R88(move->to)));
+#   endif
+    return move;
+}
+
+/**
+ * move_del() - delete a move from list.
+ * @ptr: move &list_head
+ *
+ * Remove the move whose 'list' element address is @ptr.
+ */
+void move_del(struct list_head *ptr)
+{
+    move_t *move = list_entry(ptr, move_t, list);
+
+#   ifdef DEBUG_MOVE
+    log_i(3, "delete move from %c%c to %c%c\n",
+          FILE2C(F88(move->from)), RANK2C(R88(move->from)),
+          FILE2C(F88(move->to)), RANK2C(R88(move->to)));
+#   endif
+
+    if (move->pos)
+        pos_del(move->pos);
+    list_del(ptr);
+    pool_add(moves_pool, move);
+    return;
+}
+
+/**
+ * move_del() - delete all position moves.
+ * @ppos: &position.
+ *
+ * Remove all generated moves from @pos structure.
+ */
+int moves_del(pos_t *pos)
+{
+    struct list_head *p_cur, *tmp, *head;
+    int count = 0;
+
+    for (int color = WHITE; color <= BLACK; ++color) {
+        head = &pos->moves[color];
+
+        list_for_each_safe(p_cur, tmp, head) {
+            move_del(p_cur);
+            count++;
+        }
+    }
+#   ifdef DEBUG_PIECE
+    log_f(3, "%d moves removed\n", count);
+#   endif
+    return count;
+}
+
+/* TODO: return nmoves */
+static move_t *move_pawn_add(pos_t *pos, piece_t piece, square_t from,
+                             square_t to, unsigned char rank7)
+{
+    move_t *move;
+    piece_t promote;
+    unsigned char color = COLOR(piece);
+
+    if (R88(from) == rank7) {                  /* promotion */
+        for (promote = QUEEN; promote > PAWN; promote >>= 1) {
+            if ((move = move_add(pos, piece, from, to))) {
+                move->flags |= M_PROMOTION;
+                move->promotion = promote | color;
+            }
+        }
+    } else {
+        move = move_add(pos, piece, from, to);
+    }
+    return move;
+}
+
+/**
+ * pseudo_moves_pawn() - generate moves for pawn.
+ * @pos: &position
+ * @ppiece: &piece_list pawn structure pointer
+ * @doit: add move to moves list
+ *
+ * Calculate all possible moves for @ppiece pawn.
+ * If @doit is true, add moves to @pos' moves list.
+ */
+int pseudo_moves_pawn(pos_t *pos, piece_list_t *ppiece, bool doit)
+{
+    piece_t piece = PIECE(ppiece->piece);
+    unsigned char color = COLOR(ppiece->piece);
+    square_t square = ppiece->square, new;
+    board_t *board = pos->board;
+    unsigned char rank2, rank7, rank5;
+    move_t *move = NULL;
+    char dir;
+    int count = 0;
+
+    /* setup direction */
+    if (IS_WHITE(color)) {
+        dir = 1;
+        rank2 = 1;
+        rank7 = 6;
+        rank5 = 4;
+    } else {
+        dir = -1;
+        rank2 = 6;
+        rank7 = 1;
+        rank5 = 3;
+    }
+
+#   ifdef DEBUG_MOVE
+    log_f(2, "pos:%p turn:%s piece:%d [%s %s] dir:%d at %#04x[%c%c]\n",
+          pos,
+          IS_WHITE(pos->turn)? "white": "black",
+          piece,
+          IS_WHITE(color)? "white": "black",
+          P_NAME(piece),
+          dir,
+          square,
+          FILE2C(F88(square)), RANK2C(R88(square)));
+#   endif
+
+    /* normal push. We do not test for valid destination square here,
+     * assuming position is valid. Is that correct ?
+     */
+    new = square + dir * 16;
+    if (!board[new].piece) {
+#       ifdef DEBUG_MOVE
+        log_i(4, "pushing pawn %#04x\n", square);
+#       endif
+        pos->mobility[color]++;
+        count++;
+        if (doit)
+            move_pawn_add(pos, piece | color, square, new, rank7);
+        /* push 2 squares */
+        log(4, "R88(%#x)=%d R2=%d \n", square, R88(square), rank2);
+        if (R88(square) == rank2) {
+            new += dir * 16;
+            if (SQ88_OK(new) && !board[new].piece) {
+#               ifdef DEBUG_MOVE
+                log_i(4, "pushing pawn %#04x 2 squares\n", square);
+#               endif
+                //log_f(2, "pawn move2 mobility\n");
+                pos->mobility[color]++;
+                count++;
+                if (doit)
+                    move_pawn_add(pos, piece | color, square, new, rank7);
+            }
+        }
+    }
+
+    /* en passant - not accounted for mobility. Correct ? */
+    if (pos->en_passant && R88(square) == rank5) {
+        unsigned char ep_file = F88(pos->en_passant);
+        unsigned char sq_file = F88(square);
+
+#       ifdef DEBUG_MOVE
+        log_i(4, "possible en passant on rank %#x (current = %#0x)\n", ep_file,
+              sq_file);
+#       endif
+        if (sq_file == ep_file - 1 || sq_file == ep_file + 1) {
+            square_t t_square = SQ88(ep_file, rank5); /* taken pawn square */
+            piece_t captured = board[t_square].piece;
+            move = move_pawn_add(pos, piece | color , square, pos->en_passant, rank7);
+            move->flags |= M_EN_PASSANT | M_CAPTURE;
+            move->capture = captured;
+            pos->mobility[color]++;
+            count++;
+        }
+
+    }
+
+    /* capture */
+    int two=0;
+    for (new = square + dir * 15; two < 2; new = square + dir * 17, two++) {
+#       ifdef DEBUG_MOVE
+        log_i(4, "pawn capture %#04x %#04x\n", square, new);
+#       endif
+        if (SQ88_NOK(new))
+            continue;
+        pos->controlled[color] |= SQ88_2_BB(new);
+        if (board[new].piece && COLOR(board[new].piece) != color) {
+            if (PIECE(board[new].piece) == KING)
+                pos->check[color]++;
+            //log_f(2, "pawn capture mobility\n");
+            pos->mobility[color]++;
+            count++;
+            if (doit)
+                move_pawn_add(pos, piece | color, square, new, rank7);
+        }
+    }
+#   ifdef DEBUG_MOVE
+    log_f(2, "pos:%p turn:%s piece:%d [%s %s] dir:%d at %#04x[%c%c] count=%d\n",
+          pos,
+          IS_WHITE(pos->turn)? "white": "black",
+          piece,
+          IS_WHITE(color)? "white": "black",
+          P_NAME(piece),
+          dir,
+          square,
+          FILE2C(F88(square)), RANK2C(R88(square)), count);
+#   endif
+    return count;
+}
+
+/**
+ * pseudo_moves_castle() - generate castle moves.
+ * @pos: &position
+ * @color: side for which to generate moves
+ * @doit: add move to moves list
+ * @do_king: count king moves in mobility
+ *
+ * Calculate the possible castle moves for @color side.
+ * If @doit is true, add moves to @pos' moves list.
+ * If @do_king is true, account king moves (incl. castle) to mobility.
+ *
+ * @return: The number of possible king moves.
+ */
+int pseudo_moves_castle(pos_t *pos, bool color, bool doit, bool do_king)
+{
+    board_t *board = pos->board;
+    unsigned char rank1, castle_K, castle_Q;
+    move_t *move = NULL;
+    unsigned short count=0;
+    struct can_castle *can_castle;
+    bitboard_t controlled;
+    bitboard_t occupied = pos->occupied[WHITE] | pos->occupied[BLACK];
+    //pos_t *newpos;
+
+#   ifdef DEBUG_MOVE
+    log_f(2, "pos:%p turn:%s color:%s\n",
+          pos,
+          IS_WHITE(pos->turn)? "white": "black",
+          IS_WHITE(color)? "white": "black");
+#   endif
+
+    if (IS_WHITE(color)) {
+        rank1 = 0;
+        castle_K = pos->castle & CASTLE_WK;
+        castle_Q = pos->castle & CASTLE_WQ;
+        can_castle = castle_squares+WHITE;
+        controlled = pos->controlled[BLACK];
+    } else {
+        rank1 = 7;
+        castle_K = pos->castle & CASTLE_BK;
+        castle_Q = pos->castle & CASTLE_BQ;
+        can_castle = castle_squares+BLACK;
+        controlled = pos->controlled[WHITE];
+    }
+    if (castle_K) {
+        if (occupied & can_castle->occupied[1]) {
+#           ifdef DEBUG_MOVE
+            log(5, "Cannot castle K side: occupied\n");
+#           endif
+            goto next;
+        }
+        if (controlled & can_castle->controlled[1]) {
+#           ifdef DEBUG_MOVE
+            log(5, "Cannot castle K side: controlled\n");
+#           endif
+            goto next;
+        }
+        if (do_king) {
+            pos->mobility[color]++;
+            count++;
+        }
+        if (doit) {
+            move = move_add(pos, board[SQ88(4, rank1)].piece,
+                            SQ88(4, rank1), SQ88(6, rank1));
+            if (move)
+                move->flags |= M_CASTLE_K;
+        }
+    }
+
+next:
+    if (castle_Q) {
+        if (occupied & can_castle->occupied[0]) {
+#           ifdef DEBUG_MOVE
+            log(5, "Cannot castle Q side: occupied\n");
+#           endif
+            goto end;
+        }
+        if (controlled & can_castle->controlled[0]) {
+#           ifdef DEBUG_MOVE
+            log(5, "Cannot castle Q side: controlled\n");
+#           endif
+            goto end;
+        }
+        if (do_king) {
+            pos->mobility[color]++;
+            count++;
+        }
+        if (doit) {
+            move = move_add(pos, board[SQ88(4, rank1)].piece,
+                            SQ88(4, rank1), SQ88(2, rank1));
+            if (move)
+                move->flags |= M_CASTLE_Q;
+        }
+    }
+end:
+    return count;
+}
+
+/**
+ * pseudo_moves_gen() - general move generation for non pawn pieces
+ * @pos: &position
+ * @ppiece: &piece_list structure pointer
+ * @doit: add move to moves list
+ * @do_king: count king moves
+ *
+ * Calculate all possible moves for @ppiece.
+ * If @doit is true, add moves to @pos' moves list.
+ * If @do_king is true, account king moves (incl. castle) to mobility.
+ */
+int pseudo_moves_gen(pos_t *pos, piece_list_t *ppiece, bool doit, bool do_king)
+{
+    piece_t piece = PIECE(ppiece->piece);
+    unsigned char color = COLOR(ppiece->piece);
+    struct vector *vector = vectors+piece;
+    square_t square = ppiece->square;
+    unsigned char ndirs = vector->ndirs;
+    char slide = vector->slide;
+    board_t *board = pos->board;
+    //move_t *move;
+    int count = 0;
+    u64 bb_new;
+
+#   ifdef DEBUG_MOVE
+    log_f(2, "pos:%p turn:%s piece:%d [%s %s] at %#04x[%c%c]\n",
+          pos,
+          IS_WHITE(pos->turn)? "white": "black",
+          piece,
+          IS_WHITE(color)? "white": "black",
+          P_NAME(piece),
+          square,
+          FILE2C(F88(square)), RANK2C(R88(square)));
+    log_i(5, "vector=%ld ndirs=%d slide=%d\n", vector-vectors, ndirs, slide);
+#   endif
+
+    for (int curdir = 0; curdir < ndirs; ++curdir) {
+        char dir = vector->dir[curdir];
+        for (square_t new = square + dir; ; new = new + dir) {
+            /* outside board */
+            if (SQ88_NOK(new)) {
+#               ifdef DEBUG_MOVE
+                log_i(4,"skipping %04x (invalid square)\n", new);
+#               endif
+                break;
+            }
+            bb_new = SQ88_2_BB(new);
+#           ifdef DEBUG_MOVE
+            log_i(2, "trying %#x=%c%c bb=%#lx\n",
+                  new, FILE2C(F88(new)), RANK2C(R88(new)),
+                  bb_new);
+            //bitboard_print(new_bitboard);
+#           endif
+
+            pos->controlled[color] |= bb_new;;
+
+            /* king: do not move to opponent controlled square */
+            if (piece == KING && pos->controlled[OPPONENT(color)] & bb_new) {
+#               ifdef DEBUG_MOVE
+                log_i(2, "%s king cannot move to %c%c\n",
+                      IS_WHITE(color)? "white": "black",
+                      FILE2C(F88(new)), RANK2C(R88(new)));
+#               endif
+                break;
+            }
+
+            if (bb_new & pos->occupied[color]) {
+                //bitboard_print(pos->occupied[color]);
+                //bitboard_print(pos->occupied[OPPONENT(color)]);
+#               ifdef DEBUG_MOVE
+                log_i(2, "BB: skipping %#lx [%c%c] (same color piece)\n",
+                      bb_new, FILE2C(F88(new)), RANK2C(R88(new)));
+#               endif
+                break;
+            }
+
+            /* we are sure the move is valid : we create move */
+            if (piece != KING || do_king) {
+                pos->mobility[color]++;
+                count++;
+            }
+            if (doit)
+                move_add(pos, ppiece->piece, square, new);
+            if (board[new].piece) {               /* stopper move */
+                break;
+            }
+            if (!slide)
+                break;
+        }
+    }
+#   ifdef DEBUG_MOVE
+    log_f(2, "pos:%p turn:%s piece:%d [%s %s] at %#04x[%c%c] count=%d\n",
+          pos,
+          IS_WHITE(pos->turn)? "white": "black",
+          piece,
+          IS_WHITE(color)? "white": "black",
+          P_NAME(piece),
+          square,
+          FILE2C(F88(square)), RANK2C(R88(square)), count);
+#   endif
+    return count;
+}
+
+/**
+ * moves_gen() - move generation for one color
+ * @pos: &position
+ * @color: side
+ * @doit: add move to moves list
+ * @do_king: count king moves
+ *
+ * Calculate all possible moves for @color.
+ * If @doit is true, add moves to @pos' moves list.
+ * If @do_king is true, account king moves (incl. castle) to mobility.
+ */
+int moves_gen(pos_t *pos, bool color, bool doit, bool do_king)
+{
+    struct list_head *p_cur, *tmp, *piece_list;
+    piece_list_t *piece;
+    int count = 0;
+
+#   ifdef DEBUG_MOVE
+    log_f(2, "color:%s doit:%d\n", color? "Black": "White", doit);
+#   endif
+
+    /* do not generate moves if already done for color */
+    if (!list_empty(&pos->moves[color]))
+        doit = false;
+
+    piece_list = &pos->pieces[color];
+    pos->mobility[color] = 0;
+    pos->controlled[color] = 0;
+    count += pseudo_moves_castle(pos, color, doit, do_king);
+    list_for_each_safe(p_cur, tmp, piece_list) {
+        piece = list_entry(p_cur, piece_list_t, list);
+        if (PIECE(piece->piece) != PAWN)
+            count += pseudo_moves_gen(pos, piece, doit, do_king);
+        else
+            count += pseudo_moves_pawn(pos, piece, doit);
+
+        count++;
+    }
+    return count;
+}
+
+/**
+ * moves_gen_king_moves() - adjust king mobility
+ * @pos: &position
+ * @color: king color
+ * @doit: add move to moves list
+ *
+ * Compute the number of king moves (incl. castle), after opponent controlled
+ * are known.
+ * If @doit is true, add moves to @pos' moves list.
+ *
+ * @return: The number of possible king moves.
+ */
+int moves_gen_king_moves(pos_t *pos, bool color, bool doit)
+{
+    int count = 0;
+    piece_list_t *king = list_first_entry(&pos->pieces[color], piece_list_t, list);
+    count = pseudo_moves_castle(pos, king, doit, true);
+    count += pseudo_moves_gen(pos, king, doit, true);
+    return count;
+}
+
+static int moves_cmp_eval(__unused void *data, const struct list_head *h1, const struct list_head *h2)
+{
+    move_t *m1 = list_entry(h1, move_t, list);
+    move_t *m2 = list_entry(h2, move_t, list);
+    return m2->eval_simple - m1->eval_simple;
+}
+
+/**
+ * moves_sort() sort - sort moves list, best eval first.
+ * @pos: &position.
+ */
+void moves_sort(pos_t *pos)
+{
+    list_sort(NULL, &pos->moves[pos->turn], moves_cmp_eval);
+}
+
+/**
+ * moves_gen_all_eval_sort() - calculate/generate/sort moves for side to play.
+ * @pos: &position
+ *
+ * Generate positions for each move for player to move.
+ * For each of them generate opponents moves, calculate eval, and sort the moves list.
+ */
+void moves_gen_eval_sort(pos_t *pos)
+{
+    move_t *move;
+    pos_t *newpos;
+
+    moves_gen_all(pos);
+
+    list_for_each_entry(move, &pos->moves[pos->turn], list) {
+        newpos = move_do(pos, move);
+        move->pos = newpos;
+        //move_print(0, move, 0);
+        move->eval_simple = eval_simple(newpos);
+        newpos->eval_simple = move->eval_simple;
+    }
+    moves_sort(pos);
+    //moves_print(pos, 0);
+}
+
+/**
+ * moves_gen_all() - calculate all moves, and generate moves for side to play.
+ * @pos: &position
+ *
+ * Compute pseudo moves for both sides, and generate moves for player to move.
+ */
+void moves_gen_all(pos_t *pos)
+{
+    //log_f(1, "turn=%d opponent=%d\n", pos->turn, OPPONENT(pos->turn));
+    if (!pos->moves_generated) {
+        if (!pos->moves_counted) {}
+            moves_gen(pos, OPPONENT(pos->turn), false, false);
+        moves_gen(pos, pos->turn, true, true);
+        if (!pos->moves_counted)
+            moves_gen_king_moves(pos, OPPONENT(pos->turn), false);
+        pos->moves_counted = true;
+        pos->moves_generated = true;
+    }
+}
+
+/**
+ * moves_gen_all_nomoves() - calculate number of moves for each player.
+ * @pos: &position
+ */
+void moves_gen_all_nomoves(pos_t *pos)
+{
+    //log_f(1, "turn=%d opponent=%d\n", pos->turn, OPPONENT(pos->turn));
+    if (!pos->moves_counted) {
+        moves_gen(pos, OPPONENT(pos->turn), false, false);
+        moves_gen(pos, pos->turn, false, true);
+        moves_gen_king_moves(pos, OPPONENT(pos->turn), false);
+        pos->moves_counted = true;
+    }
+}
+
+/**
+ * move_do() - execute move in a duplicated position.
+ * @pos: &pos_t struct on which move will be applied
+ * @move: &move_t struct to apply
+ *
+ * @return: &new position
+ */
+pos_t *move_do(pos_t *pos, move_t *move)
+{
+#   ifdef DEBUG_MOVE
+    //log(1, "new move: ");
+    //move_print(0, move, M_PR_NL | M_PR_LONG);
+#   endif
+
+    pos_t *new = pos_dup(pos);
+    piece_t piece = PIECE(move->piece), newpiece = piece, captured = move->capture;
+    int color = COLOR(move->piece);
+    square_t from = move->from, to = move->to;
+    u64 bb_from = SQ88_2_BB(from), bb_to = SQ88_2_BB(to);
+
+    if (move->capture || piece == PAWN)    /* 50 moves */
+        new->clock_50 = 0;
+    else
+        new->clock_50++;
+
+    if (move->flags & M_CAPTURE) {                            /* capture */
+        if (move->flags & M_EN_PASSANT) {
+            uchar ep_file = F88(pos->en_passant);
+            square_t ep_grab = color == WHITE ? SQ88(ep_file, 4): SQ88(ep_file, 3);
+            u64 bb_ep_grab = SQ88_2_BB(ep_grab);
+
+            log_f(5, "en-passant=%d,%d\n", ep_file, color == WHITE ? 4 : 3);
+            piece_del(&new->board[ep_grab].s_piece->list);
+            new->board[ep_grab].piece = 0;
+            new->occupied[OPPONENT(color)] &= ~bb_ep_grab;
+            new->bb[OPPONENT(color)][BB_PAWN] &= ~bb_ep_grab;
+
+        } else {
+            piece_del(&new->board[to].s_piece->list);
+            new->board[to].piece = 0;
+            new->occupied[OPPONENT(color)] &= ~bb_to;
+            new->bb[OPPONENT(color)][PIECETOBB(captured)] &= ~bb_to;
+        }
+
+    } else if (move->flags & M_CASTLE_Q) {
+        uchar row = R88(from);
+        square_t rook_from = SQ88(0, row);
+        square_t rook_to = SQ88(3, row);
+        u64 bb_rook_from = SQ88_2_BB(rook_from);
+        u64 bb_rook_to = SQ88_2_BB(rook_to);
+
+        new->board[rook_to] = new->board[rook_from];
+        new->board[rook_to].s_piece->square = rook_to;
+        new->occupied[color] &= ~bb_rook_from;
+        new->occupied[color] |= bb_rook_to;
+        new->bb[color][PIECETOBB(BB_ROOK)] &= ~bb_rook_from;
+        new->bb[color][PIECETOBB(BB_ROOK)] |= bb_rook_to;
+        new->board[rook_from].piece = 0;
+        new->board[rook_from].s_piece = NULL;
+        //new->castle &= color == WHITE? ~CASTLE_W: ~CASTLE_B;
+
+    } else if (move->flags & M_CASTLE_K) {
+        uchar row = R88(from);
+        square_t rook_from = SQ88(7, row);
+        square_t rook_to = SQ88(5, row);
+        u64 bb_rook_from = SQ88_2_BB(rook_from);
+        u64 bb_rook_to = SQ88_2_BB(rook_to);
+
+        new->board[rook_to] = new->board[rook_from];
+        new->board[rook_to].s_piece->square = rook_to;
+        new->occupied[color] &= ~bb_rook_from;
+        new->occupied[color] |= bb_rook_to;
+        new->bb[color][PIECETOBB(BB_ROOK)] &= ~bb_rook_from;
+        new->bb[color][PIECETOBB(BB_ROOK)] |= bb_rook_to;
+        new->board[rook_from].piece = 0;
+        new->board[rook_from].s_piece = NULL;
+        // new->castle &= color == WHITE? ~CASTLE_W: ~CASTLE_B;
+    }
+
+    new->board[to] = new->board[from];
+    /* fix dest square */
+    new->board[to].s_piece->square = to;
+    if (move->flags & M_PROMOTION) {
+        log_f(5, "promotion to %s\n", P_SYM(move->promotion));
+        log_f(5, "newpiece=%#x p=%#x\n", move->promotion, PIECE(move->promotion));
+        newpiece = PIECE(move->promotion);
+        new->board[to].piece = move->promotion;
+        new->board[to].s_piece->piece = move->promotion;
+    }
+    /* replace old occupied bitboard by new one */
+    new->occupied[color] &= ~bb_from;
+    new->occupied[color] |= bb_to;
+    new->bb[color][PIECETOBB(piece)] &= ~bb_from;
+    new->bb[color][PIECETOBB(newpiece)] |= bb_to;
+    if (move->flags & M_PROMOTION) {
+        log_f(5, "promotion color=%d bbpiece=%d\n", color, PIECETOBB(newpiece));
+        //bitboard_print(new->bb[color][PIECETOBB(newpiece)]);
+    }
+    /* set en_passant */
+    new->en_passant = 0;
+    if (piece == PAWN) {
+        if (R88(from) == 1 && R88(to) == 3)
+            pos->en_passant = SQ88(F88(from), 2);
+        else if  (R88(from) == 6 && R88(to) == 4)
+            pos->en_passant = SQ88(F88(from), 5);
+    }
+
+    /* always make "from" square empty */
+    new->board[from].piece = 0;
+    new->board[from].s_piece = NULL;
+
+    //printf("old turn=%d ", color);
+    //printf("new turn=%d\n", new->turn);
+    //fflush(stdout);
+    /* adjust castling flags */
+    if ((bb_from | bb_to) & E1bb)
+        new->castle &= ~(CASTLE_WQ | CASTLE_WK);
+    else if ((bb_from | bb_to) & A1bb)
+        new->castle &= ~CASTLE_WQ;
+    else if ((bb_from | bb_to) & H1bb)
+        new->castle &= ~CASTLE_WK;
+
+    if ((bb_from | bb_to) & E8bb)
+        new->castle &= ~(CASTLE_BQ | CASTLE_BK);
+    else if ((bb_from | bb_to) & A8bb)
+        new->castle &= ~CASTLE_BQ;
+    else if ((bb_from | bb_to) & H8bb)
+        new->castle &= ~CASTLE_BK;
+
+    SET_COLOR(new->turn, OPPONENT(color));        /* pos color */
+    return new;
+}
+
+void move_undo(pos_t *pos, __unused move_t *move)
+{
+    pos_del(pos);
+}

src/temp-migration-bitboard/move.h

@@ -0,0 +1,79 @@
+/* move.h - move management.
+ *
+ * Copyright (C) 2021 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#ifndef MOVE_H
+#define MOVE_H
+
+#include "chessdefs.h"
+#include "position.h"
+#include "pool.h"
+#include "piece.h"
+
+/* move flags
+ */
+typedef unsigned char move_flags_t;
+#define M_NORMAL       0x00
+#define M_CHECK        0x01                       /* unsure if we know */
+#define M_CAPTURE      0x02
+#define M_EN_PASSANT   0x04
+#define M_PROMOTION    0x08
+#define M_CASTLE_K     0x10
+#define M_CASTLE_Q     0x20
+
+/* moves_print flags
+ */
+#define M_PR_CAPT      0x01
+#define M_PR_NCAPT     0x02
+#define M_PR_NUM       0x04
+#define M_PR_NL        0x08
+#define M_PR_EVAL      0x20                       /* separate captures */
+#define M_PR_SEPARATE  0x40                       /* separate captures */
+#define M_PR_LONG      0x80
+
+typedef struct move_s {
+    piece_t piece;
+    square_t from, to;
+    piece_t capture;                              /* captured piece */
+    piece_t promotion;                            /* promoted piece */
+    move_flags_t flags;
+    eval_t negamax;
+    eval_t eval;
+    eval_t eval_simple;
+    pos_t *pos;
+    struct list_head list;                        /* next move */
+} move_t;
+
+pool_t *moves_pool_init();
+void moves_pool_stats();
+int move_print(int movenum, move_t *move, move_flags_t flags);
+void moves_print(pos_t *move, move_flags_t flags);
+
+void move_del(struct list_head *ptr);
+int moves_del(pos_t *pos);
+
+int pseudo_moves_castle(pos_t *pos, bool color, bool doit, bool do_king);
+int pseudo_moves_gen(pos_t *pos, piece_list_t *piece, bool doit, bool do_king);
+int pseudo_moves_pawn(pos_t *pos, piece_list_t *piece, bool doit);
+int moves_gen(pos_t *pos, bool color, bool doit, bool do_king);
+int moves_gen_king_moves(pos_t *pos, bool color, bool doit);
+
+void moves_sort(pos_t *pos);
+void moves_gen_eval_sort(pos_t *pos);
+
+void moves_gen_all(pos_t *pos);
+void moves_gen_all_nomoves(pos_t *pos);
+
+pos_t *move_do(pos_t *pos, move_t *move);
+void move_undo(pos_t *pos, move_t *move);
+
+#endif  /* MOVE_H */

src/temp-migration-bitboard/piece.c

@@ -0,0 +1,118 @@
+/* piece.c - piece list management.
+ *
+ * Copyright (C) 2021 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <malloc.h>
+#include <ctype.h>
+
+#include <debug.h>
+#include <pool.h>
+#include <list.h>
+
+#include "chessdefs.h"
+#include "piece.h"
+#include "board.h"
+#include "bitboard.h"
+#include "position.h"
+
+static pool_t *pieces_pool;
+
+struct piece_details piece_details[] = {
+    [E_EMPTY]  = { ' ', ' ', " ", " ", "",       0 },
+    [E_PAWN]   = { 'P', 'p', "♙", "♟", "Pawn",   PAWN_VALUE },
+    [E_KNIGHT] = { 'N', 'n', "♘", "♞", "Knight", KNIGHT_VALUE },
+    [E_BISHOP] = { 'B', 'b', "♗", "♝", "Bishop", BISHOP_VALUE },
+    [E_ROOK]   = { 'R', 'r', "♖", "♜", "Rook",   ROOK_VALUE },
+    [E_QUEEN]  = { 'Q', 'q', "♕", "♛", "Queen",  QUEEN_VALUE },
+    [E_KING]   = { 'K', 'k', "♔", "♚", "King",   KING_VALUE }
+};
+
+void piece_list_print(struct list_head *list)
+{
+    struct list_head *p_cur, *tmp;
+    piece_list_t *piece;
+
+    list_for_each_safe(p_cur, tmp, list) {
+        piece = list_entry(p_cur, piece_list_t, list);
+
+        printf("%s%c%c ", P_SYM(piece->piece),
+               FILE2C(F88(piece->square)),
+               RANK2C(R88(piece->square)));
+    }
+    printf("\n");
+}
+
+pool_t *piece_pool_init()
+{
+    if (!pieces_pool)
+        pieces_pool = pool_create("pieces", 128, sizeof(piece_list_t));
+    return pieces_pool;
+}
+
+void piece_pool_stats()
+{
+    if (pieces_pool)
+        pool_stats(pieces_pool);
+}
+
+piece_list_t *piece_add(pos_t *pos, piece_t piece, square_t square)
+{
+    piece_list_t *new;
+    short color = COLOR(piece);
+
+#   ifdef DEBUG_PIECE
+    log_f(3, "piece=%02x square=%02x\n", piece, square);
+    log_f(5, "Adding %s %s on %c%c\n", color? "Black": "White",
+          P_NAME(piece), FILE2C(F88(square)), RANK2C(R88(square)));
+#   endif
+    if ((new = pool_get(pieces_pool))) {
+        /* first piece is always king */
+        if (PIECE(piece) == KING)
+            list_add(&new->list, &pos->pieces[color]);
+        else
+            list_add_tail(&new->list, &pos->pieces[color]);
+        new->piece = piece;
+        new->square = square;
+        new->castle = 0;
+        new-> value = piece_details[PIECE(piece)].value;
+    }
+
+    return new;
+}
+
+void piece_del(struct list_head *ptr)
+{
+    piece_list_t *piece = list_entry(ptr, piece_list_t, list);
+#   ifdef DEBUG_PIECE
+    log_f(3, "piece=%02x square=%02x\n", piece->piece, piece->square);
+#   endif
+    list_del(ptr);
+    pool_add(pieces_pool, piece);
+    return;
+}
+
+int pieces_del(pos_t *pos, short color)
+{
+    struct list_head *p_cur, *tmp, *head;
+    int count = 0;
+
+    head = &pos->pieces[color];
+
+    list_for_each_safe(p_cur, tmp, head) {
+        piece_del(p_cur);
+        count++;
+    }
+#   ifdef DEBUG_PIECE
+    log_f(3, "color=%d removed=%d\n", color, count);
+#   endif
+    return count;
+}

src/temp-migration-bitboard/piece.h

@@ -0,0 +1,71 @@
+/* piece.h - piece definitions.
+ *
+ * Copyright (C) 2021 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#ifndef PIECE_H
+#define PIECE_H
+
+#include <ctype.h>
+
+#include "chessdefs.h"
+#include "list.h"
+#include "pool.h"
+
+#define PIECE_DEFAULT_VALUE 0
+
+/* initial default values */
+#define PAWN_VALUE    100
+#define KNIGHT_VALUE  300
+#define BISHOP_VALUE  300
+#define ROOK_VALUE    500
+#define QUEEN_VALUE   900
+#define KING_VALUE    20000
+
+typedef struct piece_list_s {
+    piece_t piece;
+    square_t square;
+    short castle;
+    s64 value;
+    struct list_head list;
+} piece_list_t;
+
+/* some default values for pieces
+ */
+extern struct piece_details {
+    char abbrev_w;                                /* used for game notation */
+    char abbrev_b;
+    char *symbol_w;
+    char *symbol_b;                               /* used for game notation */
+    char *name;
+    s64  value;
+} piece_details[];
+
+#define P_NAME(p)      piece_details[E_PIECE(p)].name
+#define P_LETTER(p)    piece_details[E_PIECE(p)].abbrev_w
+#define P_SYM(p)       piece_details[E_PIECE(p)].symbol_b
+#define P_CSHORT(p)    (IS_WHITE(p)? piece_details[E_PIECE(p)].abbrev_w: \
+                        piece_details[E_PIECE(p)].abbrev_b)
+#define P_CSYM(p)      (IS_WHITE(p)? piece_details[E_PIECE(p)].symbol_w: \
+                        piece_details[E_PIECE(p)].symbol_b)
+#define P_VALUE(p)     (piece_details[E_PIECE(p)].value)
+/* use short name or symbol - no effect
+ */
+#define P_USE_UTF      1
+
+void piece_list_print(struct list_head *list);
+pool_t *piece_pool_init();
+void piece_pool_stats();
+piece_list_t *piece_add(pos_t *pos, piece_t piece, square_t square);
+void piece_del(struct list_head *ptr);
+int pieces_del(pos_t *pos, short color);
+
+#endif

src/temp-migration-bitboard/position.c

@@ -0,0 +1,323 @@
+/* position.c - position management.
+ *
+ * Copyright (C) 2021 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+#include <ctype.h>
+
+#include "chessdefs.h"
+#include "position.h"
+#include "move.h"
+#include "fen.h"
+#include "piece.h"
+#include "eval.h"
+
+static pool_t *pos_pool;
+
+#define BYTE_PRINT "%c%c%c%c%c%c%c%c"
+#define BYTE2BIN(b) ((b) & 0x01 ? '1' : '0'),  \
+        ((b) & 0x02 ? '1' : '0'),              \
+        ((b) & 0x04 ? '1' : '0'),              \
+        ((b) & 0x08 ? '1' : '0'),              \
+        ((b) & 0x10 ? '1' : '0'),              \
+        ((b) & 0x20 ? '1' : '0'),              \
+        ((b) & 0x40 ? '1' : '0'),              \
+        ((b) & 0x80 ? '1' : '0')
+
+inline void bitboard_print(bitboard_t bb)
+{
+    int i;
+    printf("%#018lx\n", bb);
+    for (i=56; i>=0; i-=8)
+        printf("\t"BYTE_PRINT"\n",
+               BYTE2BIN(bb>>i));
+}
+
+inline void bitboard_print2(bitboard_t bb1, bitboard_t bb2)
+{
+    int i;
+    printf("\tW: %#018lx\tB: %#018lx\n", bb1, bb2);
+    for (i=56; i>=0; i-=8)
+        printf("\t"BYTE_PRINT"\t\t"BYTE_PRINT"\n",
+               BYTE2BIN(bb1>>i),
+               BYTE2BIN(bb2>>i));
+}
+
+/**
+ * pos_pieces_print() - Print position pieces
+ * @pos:  &position
+ */
+void pos_pieces_print(pos_t *pos)
+{
+    printf("White pieces (%d): \t", popcount64(pos->occupied[WHITE]));
+    piece_list_print(&pos->pieces[WHITE]);
+    printf("Black pieces (%d): \t", popcount64(pos->occupied[BLACK]));
+    piece_list_print(&pos->pieces[BLACK]);
+}
+
+/**
+ * pos_bitboards_print() - Print position bitboards
+ * @pos:  &position
+ */
+void pos_bitboards_print(pos_t *pos)
+{
+    printf("Bitboards occupied :\n");
+    bitboard_print2(pos->occupied[WHITE], pos->occupied[BLACK]);
+    printf("Bitboards controlled :\n");
+    bitboard_print2(pos->controlled[WHITE], pos->controlled[BLACK]);
+
+}
+
+/**
+ * pos_print() - Print position on stdout.
+ * @pos:  &position
+ */
+void pos_print(pos_t *pos)
+{
+    int rank, file;
+    piece_t piece;
+    board_t *board = pos->board;
+    piece_list_t *wk = list_first_entry(&pos->pieces[WHITE], piece_list_t, list),
+        *bk = list_first_entry(&pos->pieces[BLACK], piece_list_t, list);
+
+
+    printf("  +---+---+---+---+---+---+---+---+\n");
+    for (rank = 7; rank >= 0; --rank) {
+        printf("%c |", rank + '1');
+        for (file = 0; file < 8; ++file) {
+            piece = board[SQ88(file, rank)].piece;
+            printf(" %s |", P_CSYM(piece));
+        }
+        printf("\n  +---+---+---+---+---+---+---+---+\n");
+    }
+    printf("    A   B   C   D   E   F   G   H\n\n");
+    printf("Turn: %s.\n", IS_WHITE(pos->turn) ? "white" : "black");
+    printf("Kings: W:%c%c B:%c%c\n",
+           FILE2C(F88(wk->square)),
+           RANK2C(R88(wk->square)),
+           FILE2C(F88(bk->square)),
+           RANK2C(R88(bk->square)));
+    printf("Possible en-passant: [%#x] ", pos->en_passant);
+    if (pos->en_passant == 0)
+        printf("None.\n");
+    else
+        printf("%d %d = %c%c\n",
+               F88(pos->en_passant),
+               R88(pos->en_passant),
+               FILE2C(F88(pos->en_passant)),
+               RANK2C(R88(pos->en_passant)));
+
+    printf("castle [%#x] : ", pos->castle);
+
+    if (pos->castle & CASTLE_WK)
+        printf("K");
+    if (pos->castle & CASTLE_WQ)
+        printf("Q");
+    if (pos->castle & CASTLE_BK)
+        printf("k");
+    if (pos->castle & CASTLE_BQ)
+        printf("q");
+
+    printf("\n50 half-moves-rule = %d\n", pos->clock_50);
+    printf("Current move = %d\n", pos->curmove);
+    printf("Squares controlled: W:%d B:%d\n", popcount64(pos->controlled[WHITE]),
+           popcount64(pos->controlled[BLACK]));
+    printf("Mobility: W:%u B:%u\n", pos->mobility[WHITE],
+           pos->mobility[BLACK]);
+}
+
+/**
+ * pos_check() - extensive position consistenci check.
+ * @pos:  &position
+ */
+void pos_check(pos_t *pos)
+{
+    int rank, file;
+    piece_t piece;
+    board_t *board = pos->board;
+
+    /* check that board and bitboard reflect same information */
+    for (rank = 7; rank >= 0; --rank) {
+        for (file = 0; file < 8; ++file) {
+            piece_list_t *ppiece;
+            printf("checking %c%c ", file+'a', rank+'1');
+
+            piece = board[SQ88(file, rank)].piece;
+            ppiece= board[SQ88(file, rank)].s_piece;
+            printf("piece=%s ", P_CSYM(piece));
+            if (ppiece)
+                printf("ppiece=%s/sq=%#x ", P_CSYM(ppiece->piece), ppiece->square);
+            switch(PIECE(piece)) {
+                case PAWN:
+                    printf("pawn" );
+                    break;
+                case KNIGHT:
+                    printf("knight ");
+                    break;
+                case BISHOP:
+                    printf("bishop ");
+                    break;
+                case ROOK:
+                    printf("rook ");
+                    break;
+                case QUEEN:
+                    printf("queen ");
+                    break;
+                case KING:
+                    printf("king ");
+                    break;
+            }
+            printf("\n");
+        }
+    }
+}
+
+pos_t *pos_clear(pos_t *pos)
+{
+    int file, rank;
+    board_t *board = pos->board;
+
+    for (file = 0; file < 8; ++file) {
+        for (rank = 0; rank < 8; ++rank) {
+            /*printf("file = %d rank = %d SQ88 = %#2x = %d addr=%p\n", file, rank,
+                   SQ88(file, rank), SQ88(file, rank),
+                   &board[SQ88(file, rank)].piece);
+            */
+            board[SQ88(file, rank)].piece = EMPTY;
+        }
+    }
+
+    SET_WHITE(pos->turn);
+    pos->node_count = 0;
+    pos->castle = 0;
+    pos->clock_50 = 0;
+    pos->curmove = 0;
+    pos->eval = 0;
+    pos->en_passant = 0;
+    pos->occupied[WHITE] = 0;
+    pos->occupied[BLACK] = 0;
+    for (int color=0; color<2; ++color)
+        for (int piece = BB_ALL; piece < BB_END; ++piece)
+            pos->bb[color][piece] = 0;
+    pos->controlled[WHITE] = 0;
+    pos->controlled[BLACK] = 0;
+    pos->mobility[WHITE] = 0;
+    pos->mobility[BLACK] = 0;
+    pos->moves_generated = false;
+    pos->moves_counted = false;
+    /* remove pieces / moves */
+    pieces_del(pos, WHITE);
+    pieces_del(pos, BLACK);
+    moves_del(pos);
+
+    return pos;
+}
+
+/**
+ * pos_del() - delete a position.
+ * @pos: &position.
+ */
+void pos_del(pos_t *pos)
+{
+    pieces_del(pos, WHITE);
+    pieces_del(pos, BLACK);
+    moves_del(pos);
+    pool_add(pos_pool, pos);
+}
+
+pos_t *pos_startpos(pos_t *pos)
+{
+    static char *startfen="rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
+
+    return fen2pos(pos, startfen);
+}
+
+pos_t *pos_get()
+{
+    pos_t *pos = pool_get(pos_pool);
+    if (pos) {
+        INIT_LIST_HEAD(&pos->pieces[WHITE]);
+        INIT_LIST_HEAD(&pos->pieces[BLACK]);
+
+        INIT_LIST_HEAD(&pos->moves[WHITE]);
+        INIT_LIST_HEAD(&pos->moves[BLACK]);
+        pos_clear(pos);
+    } else {
+        fprintf(stderr, "zobaaa\n");
+    }
+    return pos;
+}
+
+/**
+ * pos_dup() - duplicate a position.
+ * @pos: &position to duplicate.
+ *
+ * New position is the same as source one (with duplicated pieces list),
+ * except:
+ * - moves list is empty
+ * - bestmove is NULL
+ * - nodecount is set to zero
+ * - eval is set to EVAL_INVALID
+ * - moves_generated ans moves_counted are unset
+ * - check is set to zero
+ *
+ * @return: The new position.
+ *
+ * TODO: merge with pos_get - NULL for init, non null for duplicate
+ */
+pos_t *pos_dup(pos_t *pos)
+{
+    struct list_head *p_cur, *piece_list;
+    piece_list_t *oldpiece;
+    board_t *board;
+    pos_t *new = pool_get(pos_pool);
+
+    if (new) {
+        board = new->board;
+        *new = *pos;
+        for (int color = 0; color < 2; ++color) {
+            INIT_LIST_HEAD(&new->pieces[color]);
+            INIT_LIST_HEAD(&new->moves[color]);
+            /* duplicate piece list */
+            piece_list = &pos->pieces[color];     /* white/black piece list */
+
+            list_for_each(p_cur, piece_list) {
+                oldpiece = list_entry(p_cur, piece_list_t, list);
+                board[oldpiece->square].s_piece =
+                    piece_add(new, oldpiece->piece, oldpiece->square);
+            }
+        }
+        new->bestmove = NULL;
+        new->node_count = 0;
+        new->eval = EVAL_INVALID;
+        new->moves_generated = false;
+        new->moves_counted = false;
+        new->check[WHITE] = new->check[BLACK] = 0;
+    }
+    return new;
+}
+
+pool_t *pos_pool_init()
+{
+    if (!pos_pool)
+        pos_pool = pool_create("positions", 128, sizeof(pos_t));
+    return pos_pool;
+}
+
+void pos_pool_stats()
+{
+    if (pos_pool)
+        pool_stats(pos_pool);
+}

src/temp-migration-bitboard/position.h

@@ -0,0 +1,66 @@
+/* position.h - position management definitions.
+ *
+ * Copyright (C) 2021 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#ifndef POSITION_H
+#define POSITION_H
+
+#include <stdint.h>
+
+#include "pool.h"
+#include "list.h"
+#include "bitops.h"
+
+#include "board.h"
+#include "chessdefs.h"
+
+typedef struct pos_s {
+    u64 node_count;                               /* evaluated nodes */
+    piece_t turn;                                 /* we use only color bit */
+    castle_t castle;
+    u16 clock_50;
+    u16 curmove;
+    eval_t eval;
+    int check[2];
+    int eval_simple_phase;
+    eval_t eval_simple;
+    move_t *bestmove;
+    bool moves_generated;
+    bool moves_counted;
+    board_t board[BOARDSIZE];
+
+    square_t en_passant;
+
+    bitboard_t bb[2][BB_END];                     /* use: pieces[BLACK][BB_PAWN] */
+    bitboard_t occupied[2];                       /* OR of bb[COLOR][x] */
+    bitboard_t controlled[2];
+    u16 mobility[2];
+    struct list_head pieces[2];                   /* pieces list, King is first */
+    struct list_head moves[2];
+} pos_t;
+
+void bitboard_print(bitboard_t bb);
+void bitboard_print2(bitboard_t bb1, bitboard_t bb2);
+void pos_pieces_print(pos_t *pos);
+void pos_bitboards_print(pos_t *pos);
+void pos_print(pos_t *pos);
+pos_t *pos_clear(pos_t *pos);
+void pos_del(pos_t *pos);
+pos_t *pos_startpos(pos_t *pos);
+pos_t *pos_create();
+pool_t *pos_pool_init();
+void pos_pool_stats();
+pos_t *pos_get();
+pos_t *pos_dup(pos_t *pos);
+void pos_check(pos_t *pos);
+
+#endif  /* POSITION_H */

src/temp-migration-bitboard/search.c

@@ -0,0 +1,237 @@
+/* search.c - search good moves.
+ *
+ * Copyright (C) 2023 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+
+#include <br.h>
+#include <list.h>
+#include "debug.h"
+
+#include "move.h"
+#include "eval.h"
+#include "search.h"
+
+/**
+ * negamax() - search position negamax.
+ * @pos: &position to search
+ * @depth: Wanted depth.
+ * @color: 1 for white, -1 for black.
+ *
+ * Calculate the negamax value of @pos. This is an extensive search, with
+ * absolutely no cutoff.
+ *
+ * @return: The @pos negamax evaluation.
+ */
+eval_t negamax(pos_t *pos, int depth, int color)
+{
+    move_t *move;
+    pos_t *newpos;
+    eval_t best = EVAL_MIN, score;
+
+    pos->node_count++;
+    if (depth == 0) {
+        moves_gen_all_nomoves(pos);
+        score = eval(pos) * color;
+        return score;
+    }
+    moves_gen_all(pos);
+    list_for_each_entry(move, &pos->moves[pos->turn], list) {
+        newpos = move_do(pos, move);
+        score = -negamax(newpos, depth - 1, -color);
+        pos->node_count += newpos->node_count;
+        move->negamax = score;
+        if (score > best) {
+            best = score;
+            pos->bestmove = move;
+        }
+        move_undo(newpos, move);
+    }
+    return best;
+}
+
+
+/**
+ * pvs() - Principal Variation Search.
+ * @pos: &position to search
+ * @depth: wanted depth.
+ * @alpha: alpha value.
+ * @beta: beta value.
+ * @color: 1 for white, -1 for black.
+ *
+ * Calculate the PVS value of @pos.
+ * See https://en.wikipedia.org/wiki/Principal_variation_search
+ *
+ * Moves list should be first generated and evaluated/sorted.
+ *
+ * @return: The @pos PVS evaluation.
+ */
+eval_t pvs(pos_t *pos, int depth, int alpha, int beta, int color)
+{
+    move_t *move;
+    pos_t *newpos;
+    eval_t score = EVAL_INVALID;
+    bool firstchild = true;
+
+    pos->node_count++;
+
+    if (depth == 0) {
+        //return quiesce(p, alpha, beta);           /* leaf node */
+        moves_gen_all_nomoves(pos);
+        score = eval(pos) * color;
+        log_f(2, "Terminal: depth=%d ", depth);
+        log_f(2, "score=%d alpha=%d beta=%d\n", score, alpha, beta);
+        return score;
+    }
+
+    moves_gen_all(pos);
+    //moves_print(pos, M_PR_EVAL);
+    /* do the full search for first child */
+    //move = list_first_entry_or_null(&pos->moves[pos->turn], move_t, list);
+
+    list_for_each_entry(move, &pos->moves[pos->turn], list) {
+        newpos = move_do(pos, move);
+        log(2, "%.*s", 5 - depth, "                ");
+        if (firstchild) {                               /* first child */
+            score = -pvs(newpos, depth - 1, -beta, -alpha, -color);
+            log_f(2, "First child depth=%d move=", depth);
+            //move_print(0, move, 0);
+            log(2, "score=%d alpha=%d beta=%d\n", score, alpha, beta);
+            pos->bestmove = move;
+        } else {
+            /* search with a null window */
+            score = -pvs(newpos, depth - 1, -alpha - 1, -alpha, -color);
+            log_f(2, "Other child depth=%d move=", depth);
+            //move_print(0, move, 0);
+            log_f(2, "score=%d alpha=%d beta=%d ", score, alpha, beta);
+            /* for fail-soft:  if (score > alpha && score < beta) */
+            if (score > alpha) {
+                /* if failed high, do a full re-search */
+                log_f(2, "doing full search.");
+                score = -pvs(newpos, depth - 1, -beta, -alpha, -color);
+            }
+            log(2, "\n");
+        }
+        pos->node_count += newpos->node_count;
+        move_undo(newpos, move);
+        if (score >= beta) {                      /* fail-hard hard beta cut-off */
+            log(2, "%.*s", 5 - depth, "                ");
+            log_f(2, "depth=%d score=%d alpha=%d beta=%d beta cut-off.\n",
+                  depth, score, alpha, beta);
+            return beta;
+        }
+        if (score > alpha) {
+            log(2, "%.*s", 5 - depth, "                ");
+            log_f(2, "depth=%d setting new alpha from %d to %d\n",
+                  depth, alpha, score);
+            alpha = score;
+            pos->bestmove = move;
+        }
+        move->pos = NULL;
+        move->negamax = score;
+        firstchild = false;
+    }
+
+    return alpha;
+}
+
+/*
+ * int negascout (pos_t *pos, int depth, int alpha, int beta )
+ * {                     /\* compute minimax value of position p *\/
+ *     move_t *move;
+ *     pos_t *newpos;
+ *     eval_t best = EVAL_MIN, score;
+ *
+ *     int a, b, t, i;
+ *
+ *     if (depth == 0) {
+ *         //return quiesce(p, alpha, beta);           /\* leaf node *\/
+ *         moves_gen_all_nomoves(pos);
+ *         score = eval(pos) * color;
+ *         return score;
+ *     }
+ *     moves_gen_all(pos);
+ *     a = alpha;
+ *     b = beta;
+ *     list_for_each_entry(move, &pos->moves[pos->turn], list) {
+ *         log(1, "%.*s", 5 - depth, "                ");
+ *         newpos = move_do(pos, move);
+ * //    for ( i = 1; i <= w; i++ ) {
+ *         t = -negascout (newpos, depth - 1, -b, -alpha);
+ *         if ( (t > a) && (t < beta) && (i > 1) )
+ *             t = -NegaScout ( p_i, -beta, -alpha ); /\* re-search *\/
+ *         alpha = max( alpha, t );
+ *         if ( alpha >= beta )
+ *             return alpha;                            /\* cut-off *\/
+ *         b = alpha + 1;                  /\* set new null window *\/
+ *     }
+ *     return alpha;
+ * }
+ */
+
+/*
+ * int quiesce(pos_t *pos, int alpha, int beta)
+ * {
+ *     int stand_pat = eval(pos);
+ *
+ *     if( stand_pat >= beta )
+ *         return beta;
+ *     if( alpha < stand_pat )
+ *         alpha = stand_pat;
+ *
+ *     /\*
+ *      * until( every_capture_has_been_examined )  {
+ *      *     MakeCapture();
+ *      *     score = -Quiesce( -beta, -alpha );
+ *      *     TakeBackMove();
+ *      *
+ *      *     if( score >= beta )
+ *      *         return beta;
+ *      *     if( score > alpha )
+ *      *        alpha = score;
+ *      * }
+ *      *\/
+ *     return alpha;
+ * }
+ */
+
+/**
+ * ab_negamax() - search position negamax with alpha-beta cutoff.
+ * @pos: &position to search
+ * @depth: Wanted depth.
+ * @color: 1 for white, -1 for black.
+ *
+ * Calculate the negamax value of @pos, with alpha-beta pruning.
+ *
+ * @return: The @pos negamax evaluation.
+ */
+/*int ab_negamax(pos_t *pos, int alpha, int beta, int depth)
+{
+    move_t *move;
+    pos_t *newpos;
+    eval_t best = EVAL_MIN, score;
+
+    if(depth == 0) {
+       //return quiesce( alpha, beta );
+        moves_gen_all_nomoves(pos);
+       score = eval(pos) * color;
+       return score;
+    }
+   for ( all moves)  {
+      score = -alphaBeta( -beta, -alpha, depthleft - 1 );
+      if( score >= beta )
+         return beta;   //  fail hard beta-cutoff
+      if( score > alpha )
+         alpha = score; // alpha acts like max in MiniMax
+   }
+   return alpha;
+}
+*/

src/temp-migration-bitboard/search.h

@@ -0,0 +1,22 @@
+/* search.h - search for perfect move.
+ *
+ * Copyright (C) 2021 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#ifndef SEARCH_H
+#define SEARCH_H
+
+#include "position.h"
+
+eval_t negamax(pos_t *pos, int depth, int color);
+eval_t pvs(pos_t *pos, int depth, int alpha, int beta, int color);
+
+#endif  /* SEARCH_H */

src/util.c

@@ -0,0 +1,18 @@
+/* util.c - various util functions.
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "util.h"
+#include "bitboard.h"

src/util.h

@@ -0,0 +1,38 @@
+/* util.h - various util functions.
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#ifndef _UTIL_H
+#define _UTIL_H
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "bug.h"
+
+#include "chessdefs.h"
+
+#undef safe_malloc
+#undef safe_free
+
+#define safe_malloc(size) ({                   \
+            void *_ret = malloc(size);         \
+            bug_on(_ret == NULL);              \
+            _ret;                              \
+        })
+
+#define safe_free(ptr) do {                    \
+        bug_on(ptr == NULL);                   \
+        free(ptr);                             \
+    } while (0)
+
+#endif  /* UTIL_H */

test/attack-test.c

@@ -0,0 +1,65 @@
+/* attack-test.c - basic square attack tests.
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "chessdefs.h"
+#include "fen.h"
+#include "position.h"
+#include "move-gen.h"
+#include "attack.h"
+
+#include "common-test.h"
+
+int main(int __unused ac, __unused char**av)
+{
+    int i = 0;
+    char *fen;
+    pos_t *pos;//, *fishpos = pos_new();
+    bitboard_t checkers, pinners, blockers;
+
+    setlinebuf(stdout);                           /* line-buffered stdout */
+
+    bitboard_init();
+    hyperbola_init();
+
+    while ((fen = next_fen(ATTACK))) {
+        //printf(">>>>> %s\n", test[i]);
+        printf("original fen %d: [%p][%s]\n", i, fen, fen);
+        if (!(pos = fen2pos(NULL, fen))) {
+            printf("wrong fen %d: [%s]\n", i, fen);
+            continue;
+        }
+        pos->checkers = pos_checkers(pos, pos->turn);
+        pos_set_pinners_blockers(pos);
+
+        pos_print(pos);
+
+        checkers = pos->checkers;
+        pinners = pos->pinners;
+        blockers = pos->blockers;
+
+        pos_set_checkers_pinners_blockers(pos);
+
+        printf("******* %s\n", cur_comment());
+        bb_print_multi("checkers", 2, checkers, pos->checkers);
+        bb_print_multi("pinners", 2, pinners, pos->pinners);
+        bb_print_multi("blockers", 2, blockers, pos->blockers);
+
+        pos_del(pos);
+        i++;
+    }
+    return 0;
+}

test/bitboard-test.c

@@ -0,0 +1,69 @@
+/* bitboard-test.c - basic bitboard/hyperbola tests.
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "bug.h"
+
+#include "chessdefs.h"
+#include "bitboard.h"
+#include "hyperbola-quintessence.h"
+
+int main(int __unused ac, __unused char**av)
+{
+    char str[256];
+    bitboard_init();
+    hyperbola_init();
+    for (int i = 0; i < 64; ++i) {
+        sprintf(str, "\n%#x:\n   %-22s%-22s%-22s%-22s%-22s%-22s%-22s", i,
+                "sliding", "diagonal", "antidiagonal", "file", "rank", "knight",
+                "king"
+                );
+        bb_print_multi(str, 7,
+                             bb_sqfile[i] | bb_sqrank[i] |
+                             bb_sqdiag[i] | bb_sqanti[i],
+                             bb_sqdiag[i], bb_sqanti[i],
+                             bb_sqfile[i], bb_sqrank[i],
+                             bb_knight[i], bb_king[i]);
+    }
+    sprintf(str, "between: %-22s%-22s%-22s%-22s%-22s%-22s",
+            "a1-a8", "a1-h8", "a1-h1", "a2-a7", "a2-g7", "a2-g2");
+    bb_print_multi(str, 6,
+                         bb_between[A1][A8], bb_between[A1][H8],
+                         bb_between[A1][H1], bb_between[A2][A7],
+                         bb_between[A2][G7], bb_between[A2][G2]);
+    sprintf(str, "between: %-22s%-22s%-22s%-22s%-22s%-22s%-22s%-22s",
+            "c3-c6", "c3-f6", "c3-f3", "c3-e1", "c3-c1", "c3-a1", "c3-a3", "c3-a5");
+    bb_print_multi(str, 8,
+                   bb_between[C3][C6], bb_between[C3][F6],
+                   bb_between[C3][F3], bb_between[C3][E1],
+                   bb_between[C3][C1], bb_between[C3][A1],
+                   bb_between[C3][A3], bb_between[C3][A5]);
+    sprintf(str, "between: %-22s%-22s%-22s%-22s%-22s%-22s%-22s%-22s",
+            "c4-c6", "c4-f6", "c4-f3", "c4-e1", "c4-c1", "c4-a1", "c4-a3", "c4-a5");
+    bb_print_multi(str, 8,
+                   bb_between[C4][C6], bb_between[C4][F6],
+                   bb_between[C4][F3], bb_between[C4][E1],
+                   bb_between[C4][C1], bb_between[C4][A1],
+                   bb_between[C4][A3], bb_between[C4][A5]);
+    sprintf(str, "Pwn att: %-22s%-22s%-22s%-22s%-22s%-22s%-22s%-22s",
+            "White a2", "Black a2", "White h7", "Black h7",
+            "White c3", "Black c3", "White e5", "Black e5");
+    bb_print_multi(str, 8,
+                   bb_pawn_attacks[WHITE][A2], bb_pawn_attacks[BLACK][A2],
+                   bb_pawn_attacks[WHITE][H7], bb_pawn_attacks[BLACK][H7],
+                   bb_pawn_attacks[WHITE][C3], bb_pawn_attacks[BLACK][C3],
+                   bb_pawn_attacks[WHITE][E5], bb_pawn_attacks[BLACK][E5]);
+    return 0;
+}

test/common-test.h

@@ -0,0 +1,434 @@
+/* common-test.h - common static vars/funcs test
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stdio.h>
+#include "chessdefs.h"
+/* when below FENs are in a struct with selection per test */
+#define NOTEST      0
+#define FEN         1
+#define BITBOARD    2
+#define MOVEGEN     4
+#define ATTACK      8
+#define MOVEDO     16
+#define PERFT      32
+
+struct fentest {
+    int line;
+    uint modules;
+    char *comment;
+    char *fen;
+} fentest[] = {
+    /*
+    { __LINE__.
+      ATTACK,
+      "checkers: ",
+      ""
+    },
+     */
+
+/* ***************** TEMP TESTS ABOVE ************************** */
+
+    { __LINE__, MOVEGEN | MOVEDO | PERFT,
+      "illegal white e.p.",
+      "3k4/8/5K2/3pP3/8/2b5/8/8 w - d6 0 1",
+    },
+    { __LINE__, PERFT,
+      "only K, pawn push and ep moves",
+      "3k4/8/8/3pPK2/8/8/8/8 w - d6 0 1"
+    },
+
+    { __LINE__, MOVEGEN | MOVEDO | PERFT,
+      "illegal white e.p.",
+      "3k4/8/8/2qpPK2/8/8/8/8 w - d6 0 1",
+    },
+    { __LINE__, MOVEGEN | MOVEDO | PERFT,
+      "illegal black e.p.",
+      "8/8/8/8/2QPpk2/8/8/3K4 b - d3 0 1",
+    },
+    { __LINE__, MOVEGEN | MOVEDO | PERFT,
+      "illegal black e.p.",
+      "8/8/2B5/8/3Pp3/5k2/8/3K4 b - d3 0 1",
+    },
+
+    { __LINE__, MOVEGEN | MOVEDO | PERFT,
+      "legal white e.p.",
+      "1K1k4/8/8/3pP3/8/6b1/8/8 w - d6 0 1",
+    },
+    { __LINE__, MOVEGEN | MOVEDO | PERFT,
+      "legal black e.p.",
+      "8/8/6B1/8/3Pp3/8/8/1k1K4 b - d3 0 1",
+    },
+    { __LINE__, MOVEGEN | MOVEDO | PERFT,
+      "illegal e.p.",
+      "1nbqkbn1/ppp1pppp/8/r1rpP1K1/8/8/PPPP1PPP/RNBQ1BNR w - d6 0 1",
+    },
+    { __LINE__, MOVEGEN | MOVEDO | PERFT,
+      "illegal e.p. bug perft at depth 4",
+      "1nbqkbn1/ppp2ppp/4p3/r1rpP3/6K1/P7/1PPP1PPP/RNBQ1BNR b - - 1 2"
+    },
+    /*
+     * { __LINE__, MOVEGEN | MOVEDO | PERFT,
+     *   "illegal e.p. bug perft depth 3",
+     *   "1nbqkbn1/ppp2ppp/4p3/2rpP3/r5K1/P7/1PPP1PPP/RNBQ1BNR w - - 2 3"
+     * },
+     * { __LINE__, MOVEGEN | MOVEDO | PERFT,
+     *   "illegal e.p. bug perft depth 2",
+     *   "1nbqkbn1/ppp2ppp/4p3/2rpP3/r4PK1/P7/1PPP2PP/RNBQ1BNR b - - 0 3"
+     * },
+     * { __LINE__, MOVEGEN | MOVEDO | PERFT | PERFT,
+     *   "illegal e.p. bug perft depth 1 - fixed",
+     *   "1nb1kbn1/ppp2ppp/4p3/2rpP1q1/r4PK1/P7/1PPP2PP/RNBQ1BNR w - - 1 4"
+     * },
+     */
+    { __LINE__, ATTACK,
+      "only 3 K moves (but impossible situation)",
+      "1k6/8/8/8/8/8/8/r2K3r w - - 0 1"
+    },
+    { __LINE__, ATTACK,
+      "checkers: a8 h8",
+      "R2k3R/8/8/8/8/8/8/1K6 b - - 0 1"
+    },
+    { __LINE__, ATTACK,
+      "checkers: b3 g3",
+      "1k6/8/8/8/8/1r1K2r1/8/8 w - - 0 1"
+    },
+
+    { __LINE__, ATTACK,
+      "checkers: b6 g6",
+      "8/8/1R1k2R1/8/8/8/8/1K6 b - - 0 1"
+    },
+
+    { __LINE__, ATTACK,
+      "checkers: g2 g7",
+      "8/k5r1/8/8/6K1/8/6r1/8 w - - 0 1"
+    },
+    { __LINE__, ATTACK,
+      "checkers: g2 g7",
+      "8/6R1/8/6k1/8/8/K5R1/8 b - - 0 1"
+    },
+    { __LINE__, ATTACK,
+      "checkers: d5 e3, pinners: none (2 pieces between attacker & K)",
+      "3k4/8/8/3r3b/b7/1N2nn2/2n1B3/rNBK1Rbr w - - 0 1"
+    },
+
+    { __LINE__, ATTACK,
+      "checkers: d4 e6 pinners: h4 a5 a8 h8",
+      "Rn1k1r1R/4b3/1n2N3/B7/3R3B/8/8/3K4 b - - 0 1"
+    },
+    { __LINE__, ATTACK,
+      "checkers: d5 e3, pinners: a1 h1 a4 h5",
+      "3k4/8/8/3r3b/b7/1N2n3/4B3/rN1K1R1r w - - 0 1"
+    },
+
+    { __LINE__, MOVEGEN | MOVEDO | PERFT,
+      "only pawn captures",
+      "4k3/8/2p1p3/2PpP3/8/pp4pp/PP4PP/4K3 w - d6 0 1"
+    },
+
+    { __LINE__, FEN | ATTACK,
+      "checker: h4",
+      "4k3/8/8/8/7b/8/8/4K3 w - - 0 1"
+    },
+// First game moves
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "startpos",
+      "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"
+    },
+    //{ __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+    //  "1.e3 - perft bug",
+    //  "rnbqkbnr/pppppppp/8/8/8/4P3/PPPP1PPP/RNBQKBNR b KQkq - 0 1"
+    //},
+    //{ __LINE__, FEN | MOVEGEN | MOVEDO | PERFT | PERFT,
+    //  "1.e3 Nc6 - perft bug",
+    //  "r1bqkbnr/pppppppp/2n5/8/8/4P3/PPPP1PPP/RNBQKBNR w KQkq - 1 2"
+    //},
+    //{ __LINE__, FEN | MOVEGEN | MOVEDO | PERFT | PERFT,
+    //  "1.e3 Nc6 2.Ke2 - perft bug",
+    //  "r1bqkbnr/pppppppp/2n5/8/8/4P3/PPPPKPPP/RNBQ1BNR b kq - 2 2"
+    //},
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "1.e3 Nc6 2.Ke2 Nd4+ - perft bug",
+      "r1bqkbnr/pppppppp/8/8/3n4/4P3/PPPPKPPP/RNBQ1BNR w kq - 3 3"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "1.e4",
+      "rnbqkbnr/pppppppp/8/8/4P3/8/PPPP1PPP/RNBQKBNR b KQkq - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "1.Nh3",
+      "rnbqkbnr/pppppppp/8/8/8/7N/PPPPPPPP/RNBQKB1R b KQkq - 1 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "1.e4 e5 2.Nf3 Nc6",
+      "r1bqkbnr/pp1ppppp/2n5/2p5/4P3/5N2/PPPP1PPP/RNBQKB1R w KQkq - 0 1"
+    },
+
+    // castling test
+    // both can castle queen only
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "no Q castling",
+      "r3k2r/8/3B4/8/8/3b4/8/R3K2R w KQkq - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "no castling, 2 mates in 1",
+      "r3k2r/8/3BB3/8/8/3bb3/8/R3K2R w KQkq - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "r2bkb1r/8/8/8/8/3bb3/8/R2BKB1R w KQkq - 0 1"
+    },
+    //
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "4 castle possible, only K+R",
+      "r3k2r/8/8/8/8/8/8/R3K2R w KQkq - 0 1"
+    },
+    //
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "only kings on A1/A8, white to play",
+      "k7/8/8/8/8/8/8/K7 w - - 0 1"
+    },
+    //
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "only one move possible (Pf2xBg3)",
+      "k7/8/8/1p1p4/pPpPp3/P1PpPpb1/NBNP1P2/KBB1B3 w - - 0 1"
+    },
+    //
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "only 2 moves possible (Ph5xg6 e.p., Ph5-h6)",
+      "k7/8/8/1p1p2pP/pPpPp3/P1PpPp2/NBNP1P2/KBB1B3 w - g6 0 1"
+    },
+    //
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "2 Kings, W/B/ pawns on 7th for promotion",
+      "k4n2/4P3/8/8/8/8/4p3/K4N2 w - - 0 1"
+    },
+    // white castled, and can e.p. on c6 black can castle
+    // white is a pawn down
+    // white has 36 moves: P=11 + 1 e.p. N=6+3 B=5+5 R=1 Q=3 K=1 + 1 e.p.
+    // black has 33 moves: P=11 N=2+7 B=5 R=3 Q=3 K=1 + castle
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "rnbqk2r/pp1pbpp1/7p/2pPp3/4n3/3B1N2/PPP2PPP/RNBQ1RK1 w kq c6 0 7"
+    },
+
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "4k3/4p3/8/b7/1BR1p2p/1Q3P2/5N2/4K3 w - - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "r1bq1rk1/pppp1ppp/2n2n2/4p3/2B1P3/3PPN2/PPP3PP/RN1QK2R b KQ - 1 7"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "6k1/6pp/R2p4/p1p5/8/1P1r3P/6P1/6K1 b - - 3 3"
+    },
+
+    // some of tests below are from:
+    // - Rodent IV
+    // - https://www.chessprogramming.net/perfect-perft/
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "8/2p5/3p4/Kp5r/1R3p1k/8/4P1P1/8 w - - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "4rrk1/pp1n3p/3q2pQ/2p1pb2/2PP4/2P3N1/P2B2PP/4RRK1 b - - 7 19"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "rq3rk1/ppp2ppp/1bnpb3/3N2B1/3NP3/7P/PPPQ1PP1/2KR3R w - - 7 14"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "r1bq1r1k/1pp1n1pp/1p1p4/4p2Q/4Pp2/1BNP4/PPP2PPP/3R1RK1 w - - 2 14"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "r3r1k1/2p2ppp/p1p1bn2/8/1q2P3/2NPQN2/PPP3PP/R4RK1 b - - 2 15"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "1rbqk1nr/p3ppbp/2np2p1/2p5/1p2PP2/3PB1P1/PPPQ2BP/R2NK1NR b KQk - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "r1bqk2r/pp1p1ppp/2n1pn2/2p5/1bPP4/2NBP3/PP2NPPP/R1BQK2R b KQkq - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "rnb1kb1r/ppp2ppp/1q2p3/4P3/2P1Q3/5N2/PP1P1PPP/R1B1KB1R b KQkq - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "r1b2rk1/pp2nppp/1b2p3/3p4/3N1P2/2P2NP1/PP3PBP/R3R1K1 b - - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "n1q1r1k1/3b3n/p2p1bp1/P1pPp2p/2P1P3/2NBB2P/3Q1PK1/1R4N1 b - - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "r1bq1r1k/b1p1npp1/p2p3p/1p6/3PP3/1B2NN2/PP3PPP/R2Q1RK1 w - - 1 16"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "3r1rk1/p5pp/bpp1pp2/8/q1PP1P2/b3P3/P2NQRPP/1R2B1K1 b - - 6 22"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "r1q2rk1/2p1bppp/2Pp4/p6b/Q1PNp3/4B3/PP1R1PPP/2K4R w - - 2 18"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "4k2r/1pb2ppp/1p2p3/1R1p4/3P4/2r1PN2/P4PPP/1R4K1 b - - 3 22"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "3q2k1/pb3p1p/4pbp1/2r5/PpN2N2/1P2P2P/5PP1/Q2R2K1 b - - 4 26"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "2r5/8/1n6/1P1p1pkp/p2P4/R1P1PKP1/8/1R6 w - - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "r2q1rk1/1b1nbppp/4p3/3pP3/p1pP4/PpP2N1P/1P3PP1/R1BQRNK1 b - - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "6k1/5pp1/7p/p1p2n1P/P4N2/6P1/1P3P1K/8 w - - 0 35"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "r4rk1/1pp1q1pp/p2p4/3Pn3/1PP1Pp2/P7/3QB1PP/2R2RK1 b - - 0 1"
+    },
+
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "r3k2r/Pppp1ppp/1b3nbN/nP6/BBP1P3/q4N2/Pp1P2PP/R2Q1RK1 w kq - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "",
+      "1k6/1b6/8/8/7R/8/8/4K2R b K - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "Illegal ep move #1",
+      "3k4/3p4/8/K1P4r/8/8/8/8 b - - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "Illegal ep move #2",
+      "8/8/4k3/8/2p5/8/B2P2K1/8 w - - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "EP Capture Checks Opponent",
+      "8/8/1k6/2b5/2pP4/8/5K2/8 b - d3 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "Short Castling Gives Check",
+      "5k2/8/8/8/8/8/8/4K2R w K - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "Long Castling Gives Check",
+      "3k4/8/8/8/8/8/8/R3K3 w Q - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "Castle Rights",
+      "r3k2r/1b4bq/8/8/8/8/7B/R3K2R w KQkq - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "Castling Prevented",
+      "r3k2r/8/3Q4/8/8/5q2/8/R3K2R b KQkq - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "Promote out of Check",
+      "2K2r2/4P3/8/8/8/8/8/3k4 w - - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "Discovered Check",
+      "8/8/1P2K3/8/2n5/1q6/8/5k2 b - - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "Promote to give check",
+      "4k3/1P6/8/8/8/8/K7/8 w - - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "Under Promote to give check",
+      "8/P1k5/K7/8/8/8/8/8 w - - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "Self Stalemate",
+      "K1k5/8/P7/8/8/8/8/8 w - - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "Stalemate & Checkmate",
+      "8/k1P5/8/1K6/8/8/8/8 w - - 0 1"
+    },
+    { __LINE__, FEN | MOVEGEN | MOVEDO | PERFT,
+      "Stalemate & Checkmate",
+      "8/8/2k5/5q2/5n2/8/5K2/8 b - - 0 1"
+    },
+    { __LINE__, MOVEDO | PERFT,
+      "simple movedo/undo: only 2 W knights",
+      "8/1k6/8/8/8/8/6K1/1NN5 w - - 0 1"
+    },
+    { __LINE__, MOVEDO | PERFT,
+      "simple movedo/undo: only 2 W knights",
+      "5n2/1k6/8/8/5K2/8/P7/1N6 w - - 0 1"
+    },
+    { __LINE__, FEN,
+      "illegal EP and castle flags, fix-able by fen parser, SF crash",
+      "4k3/8/8/8/7B/8/8/4K3 w KQkq e6 0 1"
+    },
+    { __LINE__, FEN,
+      "illegal, SF crash",
+      "4k3/8/8/8/7b/8/8/4K3 b - - 0 1"
+    },
+    { __LINE__, FEN,
+      "illegal, SF crash",
+      "2r1k3/3B4/8/8/8/8/8/4K3 w - - 0 1"
+    },
+    { __LINE__, FEN,
+      "illegal, SF crash",
+      "2r1k3/3P4/8/8/8/8/8/4K3 w - - 0 1"
+    },
+    { __LINE__, 0, NULL, NULL }
+};
+
+static int cur = -1;
+
+static char *next_fen(uint module)
+{
+    cur++;
+    while (fentest[cur].fen && !(fentest[cur].modules & module))
+        cur++;
+    return fentest[cur].fen;
+}
+
+static __unused char* cur_comment()
+{
+    return fentest[cur].comment;
+}
+
+static __unused int cur_line()
+{
+    return fentest[cur].line;
+}

test/fen-test.c

@@ -0,0 +1,51 @@
+/* fen-test.c - basic fen tests.
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stdio.h>
+
+#include "chessdefs.h"
+#include "bitboard.h"
+#include "position.h"
+#include "fen.h"
+
+#include "common-test.h"
+
+int main(__unused int ac, __unused char**av)
+{
+    pos_t *pos;
+    const char *fen;
+    char revfen[128];
+
+    setlinebuf(stdout);                           /* line-buffered stdout */
+
+    bitboard_init();
+
+    while ((fen = next_fen(FEN))) {
+        printf("***** [%s] ", fen);
+        fflush(stdout);
+        if (!(pos = fen2pos(NULL, fen))) {
+            printf("**INVALID\n");
+        } else {
+            //pos_print(pos);
+            pos2fen(pos, revfen);
+            if (!strcmp(fen, revfen)) {
+                printf("OK\n");
+            } else {
+                //printf("fen = [%s]\nrev = [%s]", fen, revfen);
+                printf("-> [%s] **FIXED\n",revfen);
+                pos_print_raw(pos, 1);
+            }
+            pos_del(pos);
+        }
+    }
+}

test/fen.c

@@ -1,20 +0,0 @@
-#include "debug.h"
-#include "pool.h"
-#include "../src/position.h"
-#include "../src/fen.h"
-
-int main(int ac, char**av)
-{
-    pos_t *pos;
-
-    debug_init(5, stderr, true);
-    piece_pool_init();
-    pos_pool_init();
-    pos = pos_get();
-    if (ac == 1) {
-        pos_startpos(pos);
-    } else {
-        fen2pos(pos, av[1]);
-    }
-    pos_print(pos);
-}

test/movedo-test.c

@@ -0,0 +1,93 @@
+/* movedo-test.c - basic movedo/undo tests.
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "chessdefs.h"
+#include "fen.h"
+#include "position.h"
+#include "move.h"
+#include "move-do.h"
+#include "move-gen.h"
+
+#include "common-test.h"
+
+int main(int __unused ac, __unused char**av)
+{
+    int i = 0, test_line;
+    char *fen, movebuf[8];;
+    pos_t *pos, *savepos;
+    movelist_t pseudo;
+    move_t move;
+
+    setlinebuf(stdout);                           /* line-buffered stdout */
+
+    bitboard_init();
+    hyperbola_init();
+
+    while ((fen = next_fen(MOVEDO))) {
+        test_line = cur_line();
+        if (!(pos = fen2pos(NULL, fen))) {
+            printf("wrong fen %d: [%s]\n", i, fen);
+            continue;
+        }
+
+        pos->checkers = pos_checkers(pos, pos->turn);
+        pos_set_pinners_blockers(pos);
+
+        pos_gen_pseudomoves(pos, &pseudo);
+        savepos = pos_dup(pos);
+
+        state_t state = pos->state;
+        int tmp = 0, j = 0;
+        while ((move = pos_next_legal(pos, &pseudo, &tmp)) != MOVE_NONE) {
+            //pos_print(pos);
+            //printf("i=%d j=%d  turn=%d move=[%s]\n", i, j, pos->turn,
+            //       move_str(movebuf, move, 0));
+            //move_p
+            move_do(pos, move);
+            //pos_print(pos);
+            //fflush(stdout);
+            if (!pos_ok(pos, false)) {
+                printf("*** fen %d move %d [%s] invalid position after move_do\n",
+                       test_line, j, movebuf);
+                exit(0);
+            }
+
+            //printf("%d/%d move_do check ok\n", i, j);
+            move_undo(pos, move);
+            pos->state = state;
+            if (!pos_ok(pos, false)) {
+                printf("*** fen %d move %d [%s] invalid position after move_undo\n",
+                       test_line, j, movebuf);
+                exit(0);
+            }
+            if (pos_cmp(pos, savepos) != true) {
+                printf("*** fen %d move %d [%s] position differ after move_{do,undo}\n",
+                       test_line, j, movebuf);
+                exit(0);
+            }
+            //fflush(stdout);
+            //pos_check(pos, true);
+            //printf("%d/%d move_undo check ok\n", i, j);
+            j++;
+        }
+        printf("fen %d line=%d [%s] %d move_{do,undo} OK\n", i, test_line, fen, j);
+        pos_del(savepos);
+        pos_del(pos);
+        i++;
+    }
+    return 0;
+}

test/movegen-test.c

@@ -0,0 +1,288 @@
+/* movegen-test.c - basic movegen tests.
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "chessdefs.h"
+#include "fen.h"
+#include "move-gen.h"
+#include "position.h"
+
+#include "common-test.h"
+
+#define RD 0
+#define WR 1
+
+/**
+ * return write pipd fd
+ */
+static FILE *open_stockfish()
+{
+    int rpipe[2], wpipe[2];
+    FILE *out_desc;
+    pid_t pid;
+
+    if ((pipe(rpipe) < 0) || (pipe(wpipe) < 0)) {
+        perror("pipe");
+        return NULL;
+    }
+    if ((pid = fork()) < 0) {
+        perror("fork");
+        return NULL;
+    }
+
+    if (!pid) {                                   /* stockfish */
+        setvbuf(stdin,  NULL, _IOLBF, 0);
+        setvbuf(stdout, NULL, _IOLBF, 0);
+        setvbuf(stderr, NULL, _IOLBF, 0);
+
+        dup2(wpipe[RD], STDIN_FILENO);
+        dup2(rpipe[WR], STDOUT_FILENO);
+        dup2(rpipe[WR], STDERR_FILENO);
+
+        close(wpipe[RD]);
+        close(wpipe[WR]);
+        close(rpipe[RD]);
+        close(rpipe[WR]);
+        if (execlp("stockfish", "stockfish", NULL) == -1) {
+            perror("execlp");
+            return NULL;
+        }
+        return 0;                                 /* not reached */
+    }
+    /* us */
+    dup2(rpipe[RD], STDIN_FILENO);
+    setvbuf(stdin, NULL, _IOLBF, 0);
+
+    close(wpipe[RD]);
+    close(rpipe[RD]);
+    close(rpipe[WR]);
+
+    out_desc = fdopen(wpipe[WR], "w");
+    setvbuf(out_desc, NULL, _IOLBF, 0);
+
+    return out_desc;
+}
+
+static void send_stockfish_fen(FILE *desc, pos_t *pos, movelist_t *movelist, char *fen)
+{
+    char *buf = NULL;
+    int count, __unused mycount = 0, fishcount;
+    size_t alloc = 0;
+    ssize_t buflen;
+
+    pos_clear(pos);
+
+    move_t *moves = movelist->move;
+    int *nmoves = &movelist->nmoves;
+    *nmoves = 0;
+    //char nodescount[] = "Nodes searched";
+    //printf("nmoves = %d\n", nmoves);
+    fflush(stdout);
+    //sprintf(str, "stockfish \"position fen %s\ngo perft depth\n\"", fen);
+    fprintf(desc, "position fen %s\ngo perft 1\n", fen);
+    //fflush(desc);
+    while ((buflen = getline(&buf, &alloc, stdin)) > 0) {
+        buf[--buflen] = 0;
+        if (buflen == 0)
+            continue;
+        if (sscanf(buf, "Nodes searched: %d", &fishcount) == 1) {
+            break;
+        }
+        //printf("%d: %s\n", line++, buf);
+        if (sscanf(buf, "%*4s: %d", &count) == 1) {
+            square_t from = sq_from_string(buf);
+            square_t to   = sq_from_string(buf + 2);
+            mycount += count;
+            //printf("move found: %c%c->%c%c %s->%s count=%d\n",
+            //       buf[0], buf[1], buf[2], buf[3],
+            //       sq_to_string(from), sq_to_string(to),
+            //       count);
+            moves[(*nmoves)++] = move_make(from, to);
+
+        } else if (sscanf(buf, "%*5s: %d", &count) == 1) {
+            square_t from = sq_from_string(buf);
+            square_t to   = sq_from_string(buf + 2);
+            piece_type_t promoted = piece_t_from_char(*(buf + 4));
+            mycount += count;
+            //printf("move found: %c%c->%c%c %s->%s count=%d\n",
+            //       buf[0], buf[1], buf[2], buf[3],
+            //       sq_to_string(from), sq_to_string(to),
+            //       count);
+            moves[(*nmoves)++] = move_make_promote(from, to, promoted);
+        }
+    }
+    //pos->moves.nmoves = nmoves;
+    // printf("fishcount=%d mycount=%d\n", fishcount, mycount);
+    free(buf);
+}
+
+static __unused bool movelists_equal(movelist_t *fish, movelist_t *me)
+{
+    move_t *m1 = fish->move, *m2 = me->move;
+    int n1 = fish->nmoves, n2 = me->nmoves;
+    int mask = 077777;
+
+    if (n1 != n2)
+        return false;
+    for (int cur = 0; cur < n1; ++cur) {
+        if ((m1[cur] & mask) != (m2[cur] & mask))
+            return false;
+    }
+    return true;
+}
+
+static __unused void compare_moves(movelist_t *fish, movelist_t *me)
+{
+    char str1[1024] = {0}, str2[1024] = {0}, tmpstr[1024];
+    char *skip = "      ";
+    move_t *m1 = fish->move;
+    move_t *m2 = me->move;
+    int n1 = fish->nmoves;
+    int n2 = me->nmoves;
+
+#define f(c) move_from(c)
+#define t(c) move_to(c)
+
+    for (move_t *c1 = m1, *c2 = m2; (c1 - m1 < n1) || (c2 - m2 < n2);) {
+        // square_t f1 = move_from(*c1); square_t t1 = move_to(*c1);
+        // square_t f2 = move_from(*c2); square_t t2 = move_to(*c2);
+
+        /* no more move in c2 */
+        if (c2 - m2 >= n2) {
+            while (c1 - m1 < n1) {
+                sprintf(tmpstr, " %s-%s", sq_to_string(f(*c1)), sq_to_string(t(*c1)));
+                strcat (str1, tmpstr);
+                c1++;
+            }
+            break;
+        }
+        if (c1 - m1 >= n1) {
+            while (c2 - m2 < n2) {
+                sprintf(tmpstr, " %s-%s", sq_to_string(f(*c2)), sq_to_string(t(*c2)));
+                strcat (str2, tmpstr);
+                c2++;
+            }
+            break;
+        }
+
+        /* missing move in c2 */
+        if (f(*c1) < f(*c2) ||
+            (f(*c1) == f(*c2) && t(*c1) < t(*c2))) {
+            strcat(str2, skip);
+            sprintf(tmpstr, " %s-%s", sq_to_string(f(*c1)), sq_to_string(t(*c1)));
+            strcat (str1, tmpstr);
+            while ((c1 - m1 < n1) && (f(*c1) < f(*c2) ||
+                                      (f(*c1) == f(*c2) && t(*c1) < t(*c2)))) {
+                c1++;
+            }
+            continue;
+        }
+        /* missing move in c1 */
+        if (f(*c1) > f(*c2) ||
+            (f(*c1) == f(*c2) && t(*c1) > t(*c2))) {
+            strcat(str1, skip);
+            sprintf(tmpstr, " %s-%s", sq_to_string(f(*c2)), sq_to_string(t(*c2)));
+            strcat (str2, tmpstr);
+            while ((c2 - m2 < n2) && (f(*c1) > f(*c2) ||
+                                      (f(*c1) == f(*c2) && t(*c1) > t(*c2)))) {
+                c2++;
+            }
+            continue;
+        }
+        sprintf(tmpstr, " %s-%s", sq_to_string(f(*c1)), sq_to_string(t(*c1)));
+        strcat(str1, tmpstr);
+        strcat(str2, tmpstr);
+        c1++, c2++;
+    }
+    printf("F(%2d): %s\nM(%2d): %s\n", n1, str1, n2, str2);
+}
+
+int main(int __unused ac, __unused char**av)
+{
+    int i = 0;
+    FILE *outfd;
+    char *fen;
+    pos_t *pos, *fishpos = pos_new();
+    movelist_t pseudo, legal, fishmoves;
+    //bitboard_t wrong = 0x5088000040, tmp, loop;
+    //bit_for_each64(loop, tmp, )
+    //printf("fishpos 1=%p\n", fishpos);
+
+    setlinebuf(stdout);                           /* line-buffered stdout */
+
+    bitboard_init();
+    hyperbola_init();
+    outfd = open_stockfish();
+
+    while ((fen = next_fen(MOVEGEN))) {
+        //printf(">>>>> %s\n", test[i]);
+        //printf("fishpos 2=%p\n", fishpos);
+        //printf("original fen %d: [%p][%s]\n", i, fen, fen);
+        if (!(pos = fen2pos(NULL, fen))) {
+            printf("wrong fen %d: [%s]\n", i, fen);
+            continue;
+        }
+        /* print movelists */
+        send_stockfish_fen(outfd, fishpos, &fishmoves, fen);
+
+        pos_set_checkers_pinners_blockers(pos);
+        pos_gen_pseudomoves(pos, &pseudo);
+        //moves_print(&pseudo, 0);
+        pos_all_legal(pos, &pseudo, &legal);
+
+        //moves_print(&legal, 0);
+        //printf("Fu ");
+        //moves_print(fishpos, 0);
+        //fflush(stdout);
+        //printf("Mu ");
+        //moves_print(pos, 0);
+        //fflush(stdout);
+
+        /* sort and print movelists */
+        move_sort_by_sq(&fishmoves);
+        move_sort_by_sq(&legal);
+        // printf("\nFs ");
+        // moves_print(fishpos, 0);
+        // fflush(stdout);
+        // printf("Ms ");
+        // moves_print(pos, 0);
+        // fflush(stdout);
+
+        /* compare movelists */
+        if (!movelists_equal(&fishmoves, &legal)) {
+            pos_print(pos);
+            printf("F: ");
+            moves_print(&fishmoves, 0);
+            printf("M: ");
+            moves_print(&legal, 0);
+        } else {
+            printf("[%s]: OK (%d Moves)\n", fen, legal.nmoves);
+            //moves_print(&fishpos->moves, 0);
+        }
+        //compare_moves(&fishpos->moves, &legal);
+            //} else {
+            //printf("fen %d: [%s] - OK (%d moves)\n", i, fen, legal.nmoves);
+            //}
+        //pos_print_board_raw(pos, 1);
+        //printf("%s\n", pos2fen(pos, str));
+        //get_stockfish_moves(test[i]);
+        //exit(0);
+        pos_del(pos);
+        i++;
+    }
+    fclose(outfd);
+    return 0;
+}

test/perft-test.c

@@ -0,0 +1,310 @@
+/* perft-test.c - perft test.
+ *
+ * Copyright (C) 2024 Bruno Raoult ("br")
+ * Licensed under the GNU General Public License v3.0 or later.
+ * Some rights reserved. See COPYING.
+ *
+ * You should have received a copy of the GNU General Public License along with this
+ * program. If not, see <https://www.gnu.org/licenses/gpl-3.0-standalone.html>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later <https://spdx.org/licenses/GPL-3.0-or-later.html>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+#include <locale.h>
+
+#include "chessdefs.h"
+#include "fen.h"
+#include "position.h"
+#include "move.h"
+#include "move-do.h"
+#include "move-gen.h"
+#include "search.h"
+
+#include "common-test.h"
+
+#define RD 0
+#define WR 1
+
+typedef struct {
+    move_t move;
+    int count;
+} ddperft;
+
+/**
+ * return write pipd fd
+ */
+static FILE *open_stockfish()
+{
+    int rpipe[2], wpipe[2];
+    FILE *out_desc;
+    pid_t pid;
+
+    if ((pipe(rpipe) < 0) || (pipe(wpipe) < 0)) {
+        perror("pipe");
+        return NULL;
+    }
+    if ((pid = fork()) < 0) {
+        perror("fork");
+        return NULL;
+    }
+
+    if (!pid) {                                   /* stockfish */
+        setvbuf(stdin,  NULL, _IOLBF, 0);
+        setvbuf(stdout, NULL, _IOLBF, 0);
+        setvbuf(stderr, NULL, _IOLBF, 0);
+
+        dup2(wpipe[RD], STDIN_FILENO);
+        dup2(rpipe[WR], STDOUT_FILENO);
+        dup2(rpipe[WR], STDERR_FILENO);
+
+        close(wpipe[RD]);
+        close(wpipe[WR]);
+        close(rpipe[RD]);
+        close(rpipe[WR]);
+        if (execlp("stockfish", "stockfish", NULL) == -1) {
+            perror("execlp");
+            return NULL;
+        }
+        return 0;                                 /* not reached */
+    }
+    /* us */
+    dup2(rpipe[RD], STDIN_FILENO);
+    setvbuf(stdin, NULL, _IOLBF, 0);
+
+    close(wpipe[RD]);
+    close(rpipe[RD]);
+    close(rpipe[WR]);
+
+    out_desc = fdopen(wpipe[WR], "w");
+    setvbuf(out_desc, NULL, _IOLBF, 0);
+
+    return out_desc;
+}
+
+static u64 send_stockfish_fen(FILE *desc, pos_t *pos, movelist_t *movelist,
+                               char *fen, int depth)
+{
+    char *buf = NULL;
+    u64 count, mycount = 0, fishcount;
+    size_t alloc = 0;
+    ssize_t buflen;
+
+    pos_clear(pos);
+
+    move_t *moves = movelist->move;
+    int *nmoves = &movelist->nmoves;
+    *nmoves = 0;
+    //char nodescount[] = "Nodes searched";
+    //printf("nmoves = %d\n", nmoves);
+    fflush(stdout);
+    //sprintf(str, "stockfish \"position fen %s\ngo perft depth\n\"", fen);
+    fprintf(desc, "position fen %s\ngo perft %d\n", fen, depth);
+    //fflush(desc);
+    while ((buflen = getline(&buf, &alloc, stdin)) > 0) {
+        buf[--buflen] = 0;
+        if (buflen == 0)
+            continue;
+        if (sscanf(buf, "Nodes searched: %lu", &fishcount) == 1) {
+            break;
+        }
+        //printf("%d: %s\n", line++, buf);
+        if (sscanf(buf, "%*4s: %lu", &count) == 1) {
+            square_t from = sq_from_string(buf);
+            square_t to   = sq_from_string(buf + 2);
+            mycount += count;
+            //printf("move found: %c%c->%c%c %s->%s count=%d\n",
+            //       buf[0], buf[1], buf[2], buf[3],
+            //       sq_to_string(from), sq_to_string(to),
+            //       count);
+            moves[(*nmoves)++] = move_make(from, to);
+
+        } else if (sscanf(buf, "%*5s: %lu", &count) == 1) {
+            square_t from = sq_from_string(buf);
+            square_t to   = sq_from_string(buf + 2);
+            piece_type_t promoted = piece_t_from_char(*(buf + 4));
+            mycount += count;
+            //printf("move found: %c%c->%c%c %s->%s count=%d\n",
+            //       buf[0], buf[1], buf[2], buf[3],
+            //       sq_to_string(from), sq_to_string(to),
+            //       count);
+            moves[(*nmoves)++] = move_make_promote(from, to, promoted);
+        }
+    }
+    //pos->moves.nmoves = nmoves;
+    // printf("fishcount=%d mycount=%d\n", fishcount, mycount);
+    free(buf);
+    return mycount;
+}
+
+static __unused bool movelists_equal(movelist_t *fish, movelist_t *me)
+{
+    move_t *m1 = fish->move, *m2 = me->move;
+    int n1 = fish->nmoves, n2 = me->nmoves;
+    int mask = 077777;
+
+    if (n1 != n2)
+        return false;
+    for (int cur = 0; cur < n1; ++cur) {
+        if ((m1[cur] & mask) != (m2[cur] & mask))
+            return false;
+    }
+    return true;
+}
+
+static __unused void compare_moves(movelist_t *fish, movelist_t *me)
+{
+    char str1[1024] = {0}, str2[1024] = {0}, tmpstr[1024];
+    char *skip = "      ";
+    move_t *m1 = fish->move;
+    move_t *m2 = me->move;
+    int n1 = fish->nmoves;
+    int n2 = me->nmoves;
+
+#define f(c) move_from(c)
+#define t(c) move_to(c)
+
+    for (move_t *c1 = m1, *c2 = m2; (c1 - m1 < n1) || (c2 - m2 < n2);) {
+        // square_t f1 = move_from(*c1); square_t t1 = move_to(*c1);
+        // square_t f2 = move_from(*c2); square_t t2 = move_to(*c2);
+
+        /* no more move in c2 */
+        if (c2 - m2 >= n2) {
+            while (c1 - m1 < n1) {
+                sprintf(tmpstr, " %s-%s", sq_to_string(f(*c1)), sq_to_string(t(*c1)));
+                strcat (str1, tmpstr);
+                c1++;
+            }
+            break;
+        }
+        if (c1 - m1 >= n1) {
+            while (c2 - m2 < n2) {
+                sprintf(tmpstr, " %s-%s", sq_to_string(f(*c2)), sq_to_string(t(*c2)));
+                strcat (str2, tmpstr);
+                c2++;
+            }
+            break;
+        }
+
+        /* missing move in c2 */
+        if (f(*c1) < f(*c2) ||
+            (f(*c1) == f(*c2) && t(*c1) < t(*c2))) {
+            strcat(str2, skip);
+            sprintf(tmpstr, " %s-%s", sq_to_string(f(*c1)), sq_to_string(t(*c1)));
+            strcat (str1, tmpstr);
+            while ((c1 - m1 < n1) && (f(*c1) < f(*c2) ||
+                                      (f(*c1) == f(*c2) && t(*c1) < t(*c2)))) {
+                c1++;
+            }
+            continue;
+        }
+        /* missing move in c1 */
+        if (f(*c1) > f(*c2) ||
+            (f(*c1) == f(*c2) && t(*c1) > t(*c2))) {
+            strcat(str1, skip);
+            sprintf(tmpstr, " %s-%s", sq_to_string(f(*c2)), sq_to_string(t(*c2)));
+            strcat (str2, tmpstr);
+            while ((c2 - m2 < n2) && (f(*c1) > f(*c2) ||
+                                      (f(*c1) == f(*c2) && t(*c1) > t(*c2)))) {
+                c2++;
+            }
+            continue;
+        }
+        sprintf(tmpstr, " %s-%s", sq_to_string(f(*c1)), sq_to_string(t(*c1)));
+        strcat(str1, tmpstr);
+        strcat(str2, tmpstr);
+        c1++, c2++;
+    }
+    printf("F(%2d): %s\nM(%2d): %s\n", n1, str1, n2, str2);
+}
+
+
+int main(int __unused ac, __unused char**av)
+{
+    int i = 0, test_line;
+    u64 sf_count, my_count;
+    char *fen;
+    pos_t *pos, *savepos, *fishpos = pos_new();
+    movelist_t fishmoves;
+    //move_t move;
+    FILE *outfd;
+    s64 ms1 = 0, ms1_total = 0;
+    s64 ms2 = 0, ms2_total = 0;
+
+    int depth = 6, run = 3;
+
+    if (ac > 1)
+        depth = atoi(av[1]);
+    if (ac > 2)
+        run =  atoi(av[2]) & 3;
+    printf("depth = %d run=%d\n", depth, run);
+
+    if (!run)
+        exit(0);
+    setlocale(LC_NUMERIC, "");
+    setlinebuf(stdout);                           /* line-buffered stdout */
+    outfd = open_stockfish();
+
+    bitboard_init();
+    hyperbola_init();
+
+    CLOCK_DEFINE(clock, CLOCK_PROCESS);
+    while ((fen = next_fen(PERFT | MOVEDO))) {
+        test_line = cur_line();
+        if (!(pos = fen2pos(NULL, fen))) {
+            printf("wrong fen %d: [%s]\n", i, fen);
+            continue;
+        }
+        sf_count = send_stockfish_fen(outfd, fishpos, &fishmoves, fen, depth);
+        savepos = pos_dup(pos);
+
+        if (run & 1) {
+            clock_start(&clock);
+            my_count = perft(pos, depth, 1);
+            ms1 = clock_elapsed_ms(&clock);
+            ms1_total += ms1;
+
+            if (sf_count == my_count) {
+                printf("pt1 OK : line=%3d perft=%'lu %'ldms lps=%'lu \"%s\"\n",
+                       test_line, my_count, ms1,
+                       ms1? my_count*1000l/ms1: 0,
+                       fen);
+            } else  {
+                printf("pt1 ERR: line=%3d sf=%'lu me=%'lu \"%s\"\n",
+                       test_line, sf_count, my_count, fen);
+            }
+        }
+
+        if (run & 2) {
+            clock_start(&clock);
+            my_count = perft_new_pinners(pos, depth, 1);
+            ms2 = clock_elapsed_ms(&clock);
+            ms2_total += ms2;
+
+            if (sf_count == my_count) {
+                printf("pt2 OK : line=%3d perft=%'lu %'ldms lps=%'lu \"%s\"\n",
+                       test_line, my_count, ms2,
+                       ms2? my_count*1000l/ms2: 0,
+                       fen);
+            } else  {
+                printf("pt2 ERR: line=%3d sf=%'lu me=%'lu \"%s\"\n",
+                       test_line, sf_count, my_count, fen);
+            }
+        }
+        printf("\n");
+        pos_del(savepos);
+        pos_del(pos);
+        i++;
+        /* to run first test only */
+        // exit(0);
+    }
+    if (run & 1)
+        printf("total perft  %'ldms\n", ms1_total);
+    if (run & 2)
+        printf("total perft2 %'ldms\n", ms2_total);
+    return 0;
+}

test/piece-test.c

@@ -0,0 +1,20 @@
+#include <stdio.h>
+
+#include "brlib.h"
+
+#include "piece.h"
+
+int main(__unused int ac, __unused char**av)
+{
+
+    piece_t p;
+    char *test="PNBRQKpnbrqk";
+
+    for (u64 i = 0; i < sizeof(test); ++i) {
+        char c1 = test[i], *c2;
+        p = piece_from_fen(c1);
+        c2 = piece_to_fen(p);
+        printf("c1=%c c2=%c\n", c1, *c2);
+    }
+    return 0;
+}

test/piece.c

@@ -1,55 +0,0 @@
-#include <stdio.h>
-
-#include "debug.h"
-
-#include "../src/fen.h"
-#include "../src/position.h"
-#include "../src/bitboard.h"
-
-int main(int ac, char**av)
-{
-    pos_t *pos;
-    printf("zobi\n");fflush(stdout);
-    debug_init(6, stderr, true);
-    log_f(5, "kfsjdhg\n");
-    pos_pool_init();
-    pos = pos_get();
-    piece_pool_init();
-
-    if (ac == 1) {
-    printf("zoba\n");fflush(stdout);
-        pos_startpos(pos);
-    } else {
-        fen2pos(pos, av[1]);
-    }
-    pos_print(pos);
-    pos_pieces_print(pos);
-
-    printf("0x1c = 11100 = C1-E1:\n");
-    bitboard_print(0x1c);
-
-    printf("0x70 = 111 = A1-C1\n");
-    bitboard_print(0x70);
-
-    printf("0x0e = 1110 = B1-D1\n");
-    bitboard_print(0x0e);
-
-    printf("0x60 = 1100000 = F1-G1\n");
-    bitboard_print(0x60);
-
-    printf("A1:\n");
-    bitboard_print(A1);
-
-    printf("1:\n");
-    bitboard_print(1L);
-    printf("H1:\n");
-    bitboard_print(H1);
-    printf("C1:\n");
-    bitboard_print(C1);
-    printf("D1:\n");
-    bitboard_print(D1);
-    printf("C1|D1:\n");
-    bitboard_print(C1|D1);
-    printf("H8:\n");
-    bitboard_print(H8);
-}