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- Committer: Bazaar Package Importer
- Author(s): Oliver Korff
- Date: 2005-10-09 21:56:20 UTC
- Revision ID: james.westby@ubuntu.com-20051009215620-dcuqynujzvmiglpj
Tags: upstream-1.3
Import upstream version 1.3
- files added:
added
removed
fen.cpp
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// fen.cpp
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// includes
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#include <cctype>
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#include <cstdio>
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#include <cstdlib>
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#include "board.h"
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#include "colour.h"
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#include "fen.h"
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#include "piece.h"
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#include "square.h"
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#include "util.h"
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// "constants"
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const char * StartFen = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
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// variables
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static const bool Strict = false;
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// functions
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// board_from_fen()
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bool board_from_fen(board_t *board, const char string[]) {
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int pos;
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int file, rank, sq;
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int c;
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int i, len;
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int piece;
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ASSERT(board!=NULL);
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ASSERT(string!=NULL);
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board_clear(board);
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pos = 0;
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c = string[pos];
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// piece placement
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for (rank = 7; rank >= 0; rank--) {
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for (file = 0; file < 8;) {
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sq = square_make(file,rank);
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if (c >= '1' && c <= '8') { // empty square(s)
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len = c - '0';
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if (file + len > 8) my_fatal("board_from_fen(): bad FEN (pos=%d)\n",pos);
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for (i = 0; i < len; i++) {
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board->square[sq++] = Empty;
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file++;
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}
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} else { // piece
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piece = piece_from_char(c);
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if (piece == PieceNone256) my_fatal("board_from_fen(): bad FEN (pos=%d)\n",pos);
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board->square[sq++] = piece;
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file++;
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}
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c = string[++pos];
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}
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if (rank > 0) {
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if (c != '/') my_fatal("board_from_fen(): bad FEN (pos=%d)\n",pos);
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c = string[++pos];
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}
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}
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// active colour
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if (c != ' ') my_fatal("board_from_fen(): bad FEN (pos=%d)\n",pos);
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c = string[++pos];
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switch (c) {
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case 'w' :
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board->turn = White;
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break;
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case 'b' :
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board->turn = Black;
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break;
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default :
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my_fatal("board_from_fen(): bad FEN (pos=%d)\n",pos);
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break;
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}
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c = string[++pos];
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// castling
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if (c != ' ') my_fatal("board_from_fen(): bad FEN (pos=%d)\n",pos);
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c = string[++pos];
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board->flags = FlagsNone;
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if (c == '-') { // no castling rights
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c = string[++pos];
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} else {
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if (c == 'K') {
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board->flags |= FlagsWhiteKingCastle;
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c = string[++pos];
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}
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if (c == 'Q') {
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board->flags |= FlagsWhiteQueenCastle;
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c = string[++pos];
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}
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if (c == 'k') {
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board->flags |= FlagsBlackKingCastle;
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c = string[++pos];
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}
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if (c == 'q') {
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board->flags |= FlagsBlackQueenCastle;
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c = string[++pos];
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}
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}
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// en-passant
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if (c != ' ') my_fatal("board_from_fen(): bad FEN (pos=%d)\n",pos);
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c = string[++pos];
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if (c == '-') { // no en-passant
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sq = SquareNone;
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c = string[++pos];
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} else {
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if (c < 'a' || c > 'h') my_fatal("board_from_fen(): bad FEN (pos=%d)\n",pos);
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file = file_from_char(c);
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c = string[++pos];
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if (c < '1' || c > '8') my_fatal("board_from_fen(): bad FEN (pos=%d)\n",pos);
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rank = rank_from_char(c);
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c = string[++pos];
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sq = square_make(file,rank);
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}
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board->ep_square = sq;
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// halfmove clock
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board->ply_nb = 0;
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board->move_nb = 0; // HACK, in case of broken syntax
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if (c != ' ') {
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if (!Strict) goto update;
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my_fatal("board_from_fen(): bad FEN (pos=%d)\n",pos);
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}
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c = string[++pos];
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if (!isdigit(c)) {
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if (!Strict) goto update;
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my_fatal("board_from_fen(): bad FEN (pos=%d)\n",pos);
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}
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board->ply_nb = atoi(&string[pos]);
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do c = string[++pos]; while (isdigit(c));
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// fullmove number
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board->move_nb = 0;
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if (c != ' ') {
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if (!Strict) goto update;
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my_fatal("board_from_fen(): bad FEN (pos=%d)\n",pos);
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}
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c = string[++pos];
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if (!isdigit(c)) {
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if (!Strict) goto update;
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my_fatal("board_from_fen(): bad FEN (pos=%d)\n",pos);
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}
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board->move_nb = atoi(&string[pos]) - 1;
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do c = string[++pos]; while (isdigit(c));
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// board update
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update:
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board_init_list(board);
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return true;
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}
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// board_to_fen()
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bool board_to_fen(const board_t *board, char string[], int size) {
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int pos;
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int file, rank;
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int sq, piece;
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int c;
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int len;
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ASSERT(board_is_ok(board));
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ASSERT(string!=NULL);
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ASSERT(size>=92);
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// init
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if (size < 92) return false;
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pos = 0;
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// piece placement
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for (rank = 7; rank >= 0; rank--) {
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for (file = 0; file < 8;) {
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sq = square_make(file,rank);
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piece = board->square[sq];
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ASSERT(piece==Empty||piece_is_ok(piece));
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if (piece == Empty) {
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len = 0;
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for (; file < 8 && board->square[square_make(file,rank)] == Empty; file++) {
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len++;
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}
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ASSERT(len>=1&&len<=8);
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c = '0' + len;
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} else {
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c = piece_to_char(piece);
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file++;
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}
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string[pos++] = c;
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}
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string[pos++] = '/';
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}
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string[pos-1] = ' '; // HACK: remove the last '/'
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// active colour
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string[pos++] = (colour_is_white(board->turn)) ? 'w' : 'b';
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string[pos++] = ' ';
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// castling
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if (board->flags == FlagsNone) {
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string[pos++] = '-';
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} else {
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if ((board->flags & FlagsWhiteKingCastle) != 0) string[pos++] = 'K';
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if ((board->flags & FlagsWhiteQueenCastle) != 0) string[pos++] = 'Q';
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if ((board->flags & FlagsBlackKingCastle) != 0) string[pos++] = 'k';
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if ((board->flags & FlagsBlackQueenCastle) != 0) string[pos++] = 'q';
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}
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string[pos++] = ' ';
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// en-passant
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if (board->ep_square == SquareNone) {
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string[pos++] = '-';
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} else {
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if (!square_to_string(board->ep_square,&string[pos],3)) return false;
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pos += 2;
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}
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string[pos++] = ' ';
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// halfmove clock and fullmove number
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sprintf(&string[pos],"%d %d",board->ply_nb,board->move_nb+1);
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return true;
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}
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// end of fen.cpp
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