diff --git a/2022/day09/Makefile b/2022/day09/Makefile
new file mode 100644
index 0000000..e0add74
--- /dev/null
+++ b/2022/day09/Makefile
@@ -0,0 +1,111 @@
+# AOC daily Makefile - GNU make only.
+#
+# 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>
+#
+
+INPUT   := input/input.txt
+SHELL   := /bin/bash
+
+CC      := gcc
+BEAR    := bear
+CCLSFILE:= compile_commands.json
+
+LIB     := aoc_$(shell uname -m)
+INCDIR  := ../include
+LIBDIR  := ../lib
+LDFLAGS := -L$(LIBDIR)
+#LDLIB   := -l$(LIB) -lm
+LDLIB   := -l$(LIB)
+
+export LD_LIBRARY_PATH = $(LIBDIR)
+
+CFLAGS  += -std=gnu11
+CFLAGS  += -O2
+CFLAGS  += -g
+# for gprof
+# CFLAGS += -pg
+CFLAGS  += -Wall
+CFLAGS  += -Wextra
+CFLAGS  += -march=native
+# Next one may be useful for valgrind (some invalid instructions)
+# CFLAGS += -mno-tbm
+CFLAGS  += -Wmissing-declarations
+CFLAGS  += -Wno-unused-result
+
+CFLAGS  += -DDEBUG_DEBUG 	# activate general debug (debug.c)
+CFLAGS  += -DDEBUG_POOL		# memory pools management
+
+VALGRIND := valgrind
+VALGRINDFLAGS := --leak-check=full --show-leak-kinds=all --track-origins=yes \
+	--sigill-diagnostics=yes --quiet --show-error-list=yes
+
+
+TIME    := \time -f "\ttime: %E real, %U user, %S sys\n\tcontext-switch:\t%c+%w, page-faults: %F+%R\n"
+export PATH := .:$(PATH)
+
+.PHONY: clean all compile assembly memcheck memcheck1 memcheck2 part1 part2 ccls bear org
+
+all: README.org ccls part1 part2
+
+memcheck: memcheck1 memcheck2
+
+memcheck1: aoc-c
+	@$(VALGRIND) $(VALGRINDFLAGS) aoc-c -p 1 < $(INPUT)
+
+memcheck2: aoc-c
+	@$(VALGRIND) $(VALGRINDFLAGS) aoc-c -p 2 < $(INPUT)
+	@#@valgrind -s --track-origins=yes aoc-c -p 2 < $(INPUT)
+
+compile: aoc-c
+
+cpp: aoc-c.i
+
+assembly: aoc-c.s
+
+part1: aoc-c
+	@$(TIME) aoc.bash -p 1 < $(INPUT) 2>&1
+	@$(TIME) aoc-c -p 1 < $(INPUT)
+
+part2: aoc-c
+	@$(TIME) aoc.bash -p 2 < $(INPUT) 2>&1
+	@$(TIME) aoc-c -p 2 < $(INPUT)
+
+ccls: $(CCLSFILE)
+
+clean:
+	@rm -f aoc-c core* vgcore* gmon.out aoc-c.s aoc-c.i README.html compile_commands.json
+
+aoc-c: aoc-c.c common.c
+	@echo compiling $<
+	$(CC) $(CFLAGS) $(LDFLAGS) -I $(INCDIR) $^ $(LDLIB) -o $@
+
+# generate pre-processed file (.i) and assembler (.s)
+%.i: %.c
+	@echo generating $@
+	@$(CC) -E $(CFLAGS) -I $(INCDIR) $< -o $@
+
+%.s: %.c
+	@echo generating $@
+	@$(CC) -S -fverbose-asm $(CFLAGS) -I $(INCDIR) $< -o $@
+
+# generate README.org from README.html (must cleanup !)
+org: README.org
+
+%.org: %.html
+	@echo generating $@. Cleanup before commit !
+	@pandoc $< -o $@
+
+# generate compile_commands.json
+$(CCLSFILE): aoc-c.c Makefile
+	$(BEAR) -- make clean compile
+
+bear: clean
+	@touch .ccls-root
+	@$(BEAR) -- make compile
diff --git a/2022/day09/README.org b/2022/day09/README.org
new file mode 100644
index 0000000..cfe6fd3
--- /dev/null
+++ b/2022/day09/README.org
@@ -0,0 +1,285 @@
+** --- Day 9: Rope Bridge ---
+This rope bridge creaks as you walk along it. You aren't sure how old it
+is, or whether it can even support your weight.
+
+It seems to support the Elves just fine, though. The bridge spans a
+gorge which was carved out by the massive river far below you.
+
+You step carefully; as you do, the ropes stretch and twist. You decide
+to distract yourself by modeling rope physics; maybe you can even figure
+out where /not/ to step.
+
+Consider a rope with a knot at each end; these knots mark the /head/ and
+the /tail/ of the rope. If the head moves far enough away from the tail,
+the tail is pulled toward the head.
+
+Due to nebulous reasoning involving
+[[https://en.wikipedia.org/wiki/Planck_units#Planck_length][Planck
+lengths]], you should be able to model the positions of the knots on a
+two-dimensional grid. Then, by following a hypothetical /series of
+motions/ (your puzzle input) for the head, you can determine how the
+tail will move.
+
+Due to the aforementioned Planck lengths, the rope must be quite short;
+in fact, the head (=H=) and tail (=T=) must /always be touching/
+(diagonally adjacent and even overlapping both count as touching):
+
+#+begin_example
+....
+.TH.
+....
+
+....
+.H..
+..T.
+....
+
+...
+.H. (H covers T)
+...
+#+end_example
+
+If the head is ever two steps directly up, down, left, or right from the
+tail, the tail must also move one step in that direction so it remains
+close enough:
+
+#+begin_example
+.....    .....    .....
+.TH.. -> .T.H. -> ..TH.
+.....    .....    .....
+
+...    ...    ...
+.T.    .T.    ...
+.H. -> ... -> .T.
+...    .H.    .H.
+...    ...    ...
+#+end_example
+
+Otherwise, if the head and tail aren't touching and aren't in the same
+row or column, the tail always moves one step diagonally to keep up:
+
+#+begin_example
+.....    .....    .....
+.....    ..H..    ..H..
+..H.. -> ..... -> ..T..
+.T...    .T...    .....
+.....    .....    .....
+
+.....    .....    .....
+.....    .....    .....
+..H.. -> ...H. -> ..TH.
+.T...    .T...    .....
+.....    .....    .....
+#+end_example
+
+You just need to work out where the tail goes as the head follows a
+series of motions. Assume the head and the tail both start at the same
+position, overlapping.
+
+For example:
+
+#+begin_example
+R 4
+U 4
+L 3
+D 1
+R 4
+D 1
+L 5
+R 2
+#+end_example
+
+This series of motions moves the head /right/ four steps, then /up/ four
+steps, then /left/ three steps, then /down/ one step, and so on. After
+each step, you'll need to update the position of the tail if the step
+means the head is no longer adjacent to the tail. Visually, these
+motions occur as follows (=s= marks the starting position as a reference
+point):
+
+#+begin_example
+== Initial State ==
+
+......
+......
+......
+......
+H.....  (H covers T, s)
+
+== R 4 ==
+
+......
+......
+......
+......
+TH....  (T covers s)
+
+......
+......
+......
+......
+sTH...
+
+......
+......
+......
+......
+s.TH..
+
+......
+......
+......
+......
+s..TH.
+
+== U 4 ==
+
+......
+......
+......
+....H.
+s..T..
+
+......
+......
+....H.
+....T.
+s.....
+
+......
+....H.
+....T.
+......
+s.....
+
+....H.
+....T.
+......
+......
+s.....
+
+== L 3 ==
+
+...H..
+....T.
+......
+......
+s.....
+
+..HT..
+......
+......
+......
+s.....
+
+.HT...
+......
+......
+......
+s.....
+
+== D 1 ==
+
+..T...
+.H....
+......
+......
+s.....
+
+== R 4 ==
+
+..T...
+..H...
+......
+......
+s.....
+
+..T...
+...H..
+......
+......
+s.....
+
+......
+...TH.
+......
+......
+s.....
+
+......
+....TH
+......
+......
+s.....
+
+== D 1 ==
+
+......
+....T.
+.....H
+......
+s.....
+
+== L 5 ==
+
+......
+....T.
+....H.
+......
+s.....
+
+......
+....T.
+...H..
+......
+s.....
+
+......
+......
+..HT..
+......
+s.....
+
+......
+......
+.HT...
+......
+s.....
+
+......
+......
+HT....
+......
+s.....
+
+== R 2 ==
+
+......
+......
+.H....  (H covers T)
+......
+s.....
+
+......
+......
+.TH...
+......
+s.....
+#+end_example
+
+After simulating the rope, you can count up all of the positions the
+/tail visited at least once/. In this diagram, =s= again marks the
+starting position (which the tail also visited) and =#= marks other
+positions the tail visited:
+
+#+begin_example
+..##..
+...##.
+.####.
+....#.
+s###..
+#+end_example
+
+So, there are =13= positions the tail visited at least once.
+
+Simulate your complete hypothetical series of motions. /How many
+positions does the tail of the rope visit at least once?/
diff --git a/2022/day09/aoc.h b/2022/day09/aoc.h
new file mode 100644
index 0000000..2ef8361
--- /dev/null
+++ b/2022/day09/aoc.h
@@ -0,0 +1,17 @@
+/* aoc.c: Advent of Code 2022
+ *
+ * Copyright (C) 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 _AOC_H_
+#define _AOC_H_
+
+extern int parseargs(int ac, char**av);
+
+#endif  /* _AOC_H_ */
diff --git a/2022/day09/common.bash b/2022/day09/common.bash
new file mode 100755
index 0000000..5af1e54
--- /dev/null
+++ b/2022/day09/common.bash
@@ -0,0 +1,68 @@
+#!/usr/bin/env bash
+#
+# common.bash: Advent of Code 2022, common bash functions
+#
+# Copyright (C) 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>
+
+# shellcheck disable=2034
+export cmdname=${0##*/}
+export debug=0
+export res
+export LANG=C
+
+shopt -s extglob
+set -o noglob
+
+usage() {
+    printf "usage: %s [-d DEBUG] [-p PART]\n" "$cmdname"
+    exit 1
+}
+
+checkargs() {
+    local part=1
+    while getopts p:d: todo; do
+        case "$todo" in
+            d)
+                if [[ "$OPTARG" =~ ^[[:digit:]+]$ ]]; then
+                    debug="$OPTARG"
+                else
+                    printf "%s: illegal [%s] debug level.\n" "$CMD" "$OPTARG"
+                    exit 1
+                fi
+                ;;
+            p)
+                if [[ "$OPTARG" =~ ^[12]$ ]]; then
+                    part="$OPTARG"
+                else
+                    printf "%s: illegal [%s] part.\n" "$CMD" "$OPTARG"
+                    exit 1
+                fi
+                ;;
+            *)
+                usage
+                ;;
+        esac
+    done
+    # Now check remaining argument (backup directory)
+    shift $((OPTIND - 1))
+
+    (( $# > 1 )) && usage
+    return "$part"
+}
+
+main() {
+    local -i part
+
+    checkargs "$@"
+    part=$?
+    parse "$part"
+    solve "$part"
+    printf "%s: res=%s\n" "$cmdname" "$res"
+}
diff --git a/2022/day09/common.c b/2022/day09/common.c
new file mode 100644
index 0000000..a3827b6
--- /dev/null
+++ b/2022/day09/common.c
@@ -0,0 +1,49 @@
+/* common.c: Advent of Code 2022, common functions
+ *
+ * Copyright (C) 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 <stdlib.h>
+#include <unistd.h>
+
+#include "aoc.h"
+#include "debug.h"
+
+static int usage(char *prg)
+{
+    fprintf(stderr, "Usage: %s [-d debug_level] [-p part] [-i input]\n", prg);
+    return 1;
+}
+
+int parseargs(int ac, char **av)
+{
+    int opt, part = 1;
+
+    while ((opt = getopt(ac, av, "d:p:")) != -1) {
+        switch (opt) {
+            case 'd':
+                debug_level_set(atoi(optarg));
+                break;
+            case 'p':                             /* 1 or 2 */
+                part = atoi(optarg);
+                if (part < 1 || part > 2)
+                    return usage(*av);
+                break;
+            case 'i':
+
+            default:
+                return usage(*av);
+        }
+    }
+    if (optind < ac)
+        return usage(*av);
+    return part;
+}
diff --git a/2022/day09/input/example.txt b/2022/day09/input/example.txt
new file mode 100644
index 0000000..9874df2
--- /dev/null
+++ b/2022/day09/input/example.txt
@@ -0,0 +1,8 @@
+R 4
+U 4
+L 3
+D 1
+R 4
+D 1
+L 5
+R 2
diff --git a/2022/day09/input/input.txt b/2022/day09/input/input.txt
new file mode 100644
index 0000000..a7eb5cd
--- /dev/null
+++ b/2022/day09/input/input.txt
@@ -0,0 +1,2000 @@
+L 1
+D 2
+R 2
+L 1
+D 1
+L 1
+U 1
+R 1
+L 2
+R 2
+L 2
+D 1
+R 2
+D 1
+U 2
+R 2
+D 1
+R 1
+L 2
+R 1
+D 1
+U 2
+R 2
+D 1
+R 2
+L 1
+D 1
+U 1
+R 1
+D 2
+L 1
+D 1
+L 1
+U 1
+L 2
+U 1
+L 1
+U 1
+L 1
+D 2
+R 2
+U 1
+D 2
+R 1
+U 1
+D 1
+R 1
+U 2
+L 2
+D 2
+R 1
+U 2
+L 2
+U 1
+D 1
+L 1
+R 2
+L 2
+R 1
+D 2
+L 1
+D 2
+L 1
+R 2
+U 2
+D 2
+U 1
+R 2
+D 2
+L 2
+U 1
+D 2
+R 1
+L 2
+R 1
+L 2
+U 2
+D 2
+U 2
+D 2
+R 1
+U 2
+L 2
+D 1
+U 2
+L 1
+D 1
+R 2
+U 1
+L 1
+D 1
+U 2
+D 2
+R 2
+U 1
+L 2
+D 2
+L 1
+D 2
+L 1
+U 1
+R 2
+L 2
+D 1
+R 2
+U 2
+R 2
+L 2
+D 1
+R 1
+L 1
+D 2
+U 2
+L 1
+D 1
+R 1
+L 3
+U 2
+R 2
+D 3
+L 1
+R 3
+L 1
+R 2
+D 1
+U 3
+L 1
+U 2
+L 1
+D 3
+R 3
+D 1
+U 3
+R 2
+D 2
+R 2
+L 1
+U 1
+R 1
+U 2
+R 3
+U 1
+D 1
+U 1
+R 3
+D 2
+R 2
+U 3
+D 1
+R 3
+L 3
+U 3
+D 3
+R 1
+D 3
+L 1
+D 3
+L 1
+R 1
+U 1
+L 2
+D 3
+U 3
+D 2
+U 3
+D 2
+U 2
+D 1
+R 2
+U 3
+L 1
+R 2
+L 3
+U 3
+D 3
+L 2
+R 2
+U 3
+R 1
+L 1
+U 1
+D 1
+R 2
+L 3
+U 3
+D 1
+L 1
+U 1
+R 1
+D 2
+L 2
+D 2
+R 3
+D 2
+R 3
+D 2
+R 1
+D 1
+R 3
+D 1
+U 1
+L 1
+R 2
+D 3
+L 3
+R 1
+L 2
+R 1
+U 3
+D 2
+R 1
+U 1
+L 2
+R 2
+L 2
+D 1
+U 3
+R 3
+D 2
+R 1
+U 2
+L 3
+R 1
+D 1
+U 2
+L 4
+D 2
+R 1
+U 4
+R 4
+D 3
+R 3
+U 2
+L 2
+U 1
+D 3
+U 2
+D 2
+R 4
+D 3
+R 3
+D 4
+R 2
+U 2
+L 1
+D 1
+L 2
+U 4
+D 4
+R 3
+U 2
+R 3
+U 4
+D 2
+R 3
+D 4
+L 3
+D 1
+R 4
+D 4
+R 4
+L 3
+U 1
+L 1
+D 4
+L 3
+D 1
+U 2
+R 4
+U 1
+L 4
+D 3
+U 2
+R 4
+D 3
+U 3
+L 4
+U 2
+R 1
+U 1
+D 3
+R 3
+D 1
+U 1
+L 3
+R 1
+D 2
+R 4
+U 2
+D 4
+U 4
+L 4
+R 4
+D 2
+R 3
+D 3
+R 4
+U 1
+D 3
+R 4
+L 1
+U 1
+L 1
+D 4
+R 1
+U 4
+L 3
+R 2
+U 4
+R 3
+U 1
+L 3
+D 2
+L 2
+R 3
+D 1
+L 4
+D 2
+R 3
+L 4
+R 4
+L 2
+U 1
+D 1
+R 3
+U 4
+D 4
+U 4
+D 4
+R 4
+U 4
+D 1
+U 1
+D 4
+U 1
+D 4
+U 4
+R 4
+D 4
+L 4
+D 1
+U 5
+R 5
+U 5
+L 1
+R 4
+U 5
+L 2
+U 4
+D 1
+R 1
+L 4
+D 2
+L 5
+D 5
+R 3
+L 2
+R 1
+U 1
+R 5
+D 2
+U 1
+L 1
+D 4
+U 4
+L 2
+U 4
+L 1
+D 4
+L 1
+U 4
+L 3
+U 3
+D 2
+L 3
+D 2
+L 3
+R 1
+L 2
+U 1
+L 2
+R 2
+D 5
+U 4
+R 1
+D 5
+U 2
+R 3
+U 4
+L 4
+R 5
+L 2
+R 5
+U 5
+D 3
+R 2
+D 1
+R 2
+U 4
+D 1
+R 4
+D 5
+R 4
+L 4
+U 5
+D 1
+L 2
+R 1
+U 3
+L 5
+R 5
+L 2
+D 3
+L 2
+R 3
+U 2
+D 2
+U 3
+L 5
+U 3
+D 1
+R 1
+D 3
+L 2
+U 1
+D 2
+U 4
+L 4
+U 5
+R 5
+U 5
+L 5
+R 3
+L 1
+D 1
+L 3
+D 4
+R 1
+D 1
+R 3
+L 4
+U 4
+L 1
+R 5
+D 4
+U 2
+D 6
+U 6
+L 6
+U 2
+L 2
+D 6
+U 2
+R 2
+U 1
+R 6
+D 6
+R 5
+L 4
+R 3
+D 4
+L 6
+U 1
+D 2
+L 5
+U 2
+D 1
+U 6
+R 4
+L 4
+U 3
+L 3
+U 6
+L 4
+R 4
+L 5
+U 2
+L 1
+U 1
+D 5
+U 4
+D 5
+L 5
+U 3
+R 6
+U 5
+D 6
+R 3
+D 1
+L 3
+R 5
+U 5
+R 4
+D 3
+U 1
+D 1
+R 1
+D 1
+L 6
+U 2
+D 4
+U 6
+D 4
+L 6
+D 4
+R 6
+U 4
+R 2
+D 2
+U 1
+L 2
+U 5
+D 4
+L 2
+D 1
+L 3
+R 1
+L 1
+R 6
+L 3
+U 5
+D 3
+R 5
+U 1
+D 5
+R 4
+D 2
+U 6
+R 1
+U 3
+D 2
+R 1
+U 6
+R 2
+U 5
+R 4
+D 6
+U 1
+R 2
+D 6
+U 5
+R 1
+D 6
+U 2
+L 3
+U 3
+D 1
+R 4
+D 1
+L 3
+R 4
+U 2
+R 6
+L 3
+R 6
+U 6
+D 1
+R 4
+D 2
+U 6
+D 3
+R 2
+L 1
+D 5
+L 6
+R 4
+D 3
+R 2
+U 2
+R 4
+D 1
+U 2
+L 6
+D 3
+L 3
+D 6
+L 4
+U 6
+D 2
+R 3
+D 7
+L 7
+R 4
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