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