1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/chess/rules.h Mon Mar 31 11:16:32 2014 +0200
1.3 @@ -0,0 +1,154 @@
1.4 +/*
1.5 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
1.6 + *
1.7 + * Copyright 2014 Mike Becker. All rights reserved.
1.8 + *
1.9 + * Redistribution and use in source and binary forms, with or without
1.10 + * modification, are permitted provided that the following conditions are met:
1.11 + *
1.12 + * 1. Redistributions of source code must retain the above copyright
1.13 + * notice, this list of conditions and the following disclaimer.
1.14 + *
1.15 + * 2. Redistributions in binary form must reproduce the above copyright
1.16 + * notice, this list of conditions and the following disclaimer in the
1.17 + * documentation and/or other materials provided with the distribution.
1.18 + *
1.19 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
1.20 + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1.21 + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1.22 + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
1.23 + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
1.24 + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
1.25 + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
1.26 + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
1.27 + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
1.28 + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
1.29 + * POSSIBILITY OF SUCH DAMAGE.
1.30 + *
1.31 + */
1.32 +
1.33 +#ifndef RULES_H
1.34 +#define RULES_H
1.35 +
1.36 +#include <stdint.h>
1.37 +
1.38 +#define VALID_MOVE_SYNTAX 0
1.39 +#define INVALID_MOVE_SYNTAX 1
1.40 +#define INVALID_POSITION 2
1.41 +#define AMBIGUOUS_MOVE 3
1.42 +#define NEED_PROMOTION 4
1.43 +
1.44 +
1.45 +#define PIECE_MASK 0x0F
1.46 +#define COLOR_MASK 0x30
1.47 +#define ENPASSANT_THREAT 0x40
1.48 +
1.49 +#define WHITE 0x10
1.50 +#define BLACK 0x20
1.51 +
1.52 +#define PAWN 0x01
1.53 +#define ROOK 0x02
1.54 +#define KNIGHT 0x03
1.55 +#define BISHOP 0x04
1.56 +#define QUEEN 0x05
1.57 +#define KING 0x06
1.58 +
1.59 +#define WPAWN (WHITE|PAWN)
1.60 +#define WROOK (WHITE|ROOK)
1.61 +#define WKNIGHT (WHITE|KNIGHT)
1.62 +#define WBISHOP (WHITE|BISHOP)
1.63 +#define WQUEEN (WHITE|QUEEN)
1.64 +#define WKING (WHITE|KING)
1.65 +#define BPAWN (BLACK|PAWN)
1.66 +#define BROOK (BLACK|ROOK)
1.67 +#define BKNIGHT (BLACK|KNIGHT)
1.68 +#define BBISHOP (BLACK|BISHOP)
1.69 +#define BQUEEN (BLACK|QUEEN)
1.70 +#define BKING (BLACK|KING)
1.71 +
1.72 +typedef uint8_t Board[8][8];
1.73 +
1.74 +typedef struct {
1.75 + uint8_t piece;
1.76 + uint8_t fromfile;
1.77 + uint8_t fromrow;
1.78 + uint8_t tofile;
1.79 + uint8_t torow;
1.80 + uint8_t promotion;
1.81 + _Bool check;
1.82 + _Bool checkmate;
1.83 + _Bool capture;
1.84 +} Move;
1.85 +
1.86 +#define POS_UNSPECIFIED UINT8_MAX
1.87 +#define mdst(b,m) b[(m)->torow][(m)->tofile]
1.88 +#define msrc(b,m) b[(m)->fromrow][(m)->fromfile]
1.89 +
1.90 +#define isidx(idx) ((uint8_t)idx < 8)
1.91 +
1.92 +#define isfile(file) (file >= 'a' && file <= 'h')
1.93 +#define isrow(row) (row >= '1' && row <= '8')
1.94 +
1.95 +#define rowidx(row) (row-'1')
1.96 +#define fileidx(file) (file-'a')
1.97 +
1.98 +#define rowchr(row) (row+'1')
1.99 +#define filechr(file) (file+'a')
1.100 +
1.101 +#define chkidx(move) (isidx((move)->fromfile) && isidx((move)->fromrow) && \
1.102 + isidx((move)->tofile) && isidx((move)->torow))
1.103 +
1.104 +/* secure versions - use, if index is not checked with isidx() */
1.105 +#define fileidx_s(c) (isfile(c)?fileidx(c):POS_UNSPECIFIED)
1.106 +#define rowidx_s(c) (isrow(c)?rowidx(c):POS_UNSPECIFIED)
1.107 +
1.108 +/**
1.109 + * Maps a character to a piece.
1.110 + *
1.111 + * Does not work for pawns, since they don't have a character.
1.112 + *
1.113 + * @param c one of R,N,B,Q,K
1.114 + * @return numeric value for the specified piece
1.115 + */
1.116 +uint8_t getpiece(char c);
1.117 +
1.118 +/**
1.119 + * Maps a piece to a character.
1.120 + *
1.121 + * Does not work for pawns, scince they don't have a character.
1.122 + *
1.123 + * @param piece one of ROOK, KNIGHT, BISHOP, QUEEN, KING
1.124 + * @return character value for the specified piece
1.125 + */
1.126 +char getpiecechr(uint8_t piece);
1.127 +
1.128 +/**
1.129 + * Evaluates a move syntactically and stores the move data in the specified
1.130 + * object.
1.131 + *
1.132 + * @param board the current state of the board
1.133 + * @param mycolor the color of the current player
1.134 + * @param mstr the input string to parse
1.135 + * @param move a pointer to object where the move data shall be stored
1.136 + * @return status code (see rules/rules.h for the list of codes)
1.137 + */
1.138 +int eval_move(Board board, uint8_t mycolor, char *mstr, Move *move);
1.139 +
1.140 +/**
1.141 + * Validates move by applying chess rules.
1.142 + * @param board the current board state
1.143 + * @param move the move to validate
1.144 + * @return TRUE, if the move complies to chess rules, FALSE otherwise
1.145 + */
1.146 +_Bool validate_move(Board board, Move *move);
1.147 +
1.148 +/**
1.149 + * Applies a move and deletes captured pieces.
1.150 + *
1.151 + * @param board the current board state
1.152 + * @param move the move to apply
1.153 + */
1.154 +void apply_move(Board board, Move *move);
1.155 +
1.156 +#endif /* RULES_H */
1.157 +
