Mercurial > hg > terminal-chess / file comparison
comparison: src/chess/rules.h
src/chess/rules.h
- changeset 19
- 6a26114297a1
- parent 18
- 6008840b859e
- child 23
- 824c9522ce66
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| 18:6008840b859e | 19:6a26114297a1 |
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| 1 /* | |
| 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. | |
| 3 * | |
| 4 * Copyright 2014 Mike Becker. All rights reserved. | |
| 5 * | |
| 6 * Redistribution and use in source and binary forms, with or without | |
| 7 * modification, are permitted provided that the following conditions are met: | |
| 8 * | |
| 9 * 1. Redistributions of source code must retain the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer. | |
| 11 * | |
| 12 * 2. Redistributions in binary form must reproduce the above copyright | |
| 13 * notice, this list of conditions and the following disclaimer in the | |
| 14 * documentation and/or other materials provided with the distribution. | |
| 15 * | |
| 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
| 17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE | |
| 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
| 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
| 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
| 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
| 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
| 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
| 26 * POSSIBILITY OF SUCH DAMAGE. | |
| 27 * | |
| 28 */ | |
| 29 | |
| 30 #ifndef RULES_H | |
| 31 #define RULES_H | |
| 32 | |
| 33 #include <stdint.h> | |
| 34 | |
| 35 #define VALID_MOVE_SYNTAX 0 | |
| 36 #define INVALID_MOVE_SYNTAX 1 | |
| 37 #define INVALID_POSITION 2 | |
| 38 #define AMBIGUOUS_MOVE 3 | |
| 39 #define NEED_PROMOTION 4 | |
| 40 | |
| 41 | |
| 42 #define PIECE_MASK 0x0F | |
| 43 #define COLOR_MASK 0x30 | |
| 44 #define ENPASSANT_THREAT 0x40 | |
| 45 | |
| 46 #define WHITE 0x10 | |
| 47 #define BLACK 0x20 | |
| 48 | |
| 49 #define PAWN 0x01 | |
| 50 #define ROOK 0x02 | |
| 51 #define KNIGHT 0x03 | |
| 52 #define BISHOP 0x04 | |
| 53 #define QUEEN 0x05 | |
| 54 #define KING 0x06 | |
| 55 | |
| 56 #define WPAWN (WHITE|PAWN) | |
| 57 #define WROOK (WHITE|ROOK) | |
| 58 #define WKNIGHT (WHITE|KNIGHT) | |
| 59 #define WBISHOP (WHITE|BISHOP) | |
| 60 #define WQUEEN (WHITE|QUEEN) | |
| 61 #define WKING (WHITE|KING) | |
| 62 #define BPAWN (BLACK|PAWN) | |
| 63 #define BROOK (BLACK|ROOK) | |
| 64 #define BKNIGHT (BLACK|KNIGHT) | |
| 65 #define BBISHOP (BLACK|BISHOP) | |
| 66 #define BQUEEN (BLACK|QUEEN) | |
| 67 #define BKING (BLACK|KING) | |
| 68 | |
| 69 typedef uint8_t Board[8][8]; | |
| 70 | |
| 71 typedef struct { | |
| 72 uint8_t piece; | |
| 73 uint8_t fromfile; | |
| 74 uint8_t fromrow; | |
| 75 uint8_t tofile; | |
| 76 uint8_t torow; | |
| 77 uint8_t promotion; | |
| 78 _Bool check; | |
| 79 _Bool checkmate; | |
| 80 _Bool capture; | |
| 81 } Move; | |
| 82 | |
| 83 #define POS_UNSPECIFIED UINT8_MAX | |
| 84 #define mdst(b,m) b[(m)->torow][(m)->tofile] | |
| 85 #define msrc(b,m) b[(m)->fromrow][(m)->fromfile] | |
| 86 | |
| 87 #define isidx(idx) ((uint8_t)idx < 8) | |
| 88 | |
| 89 #define isfile(file) (file >= 'a' && file <= 'h') | |
| 90 #define isrow(row) (row >= '1' && row <= '8') | |
| 91 | |
| 92 #define rowidx(row) (row-'1') | |
| 93 #define fileidx(file) (file-'a') | |
| 94 | |
| 95 #define rowchr(row) (row+'1') | |
| 96 #define filechr(file) (file+'a') | |
| 97 | |
| 98 #define chkidx(move) (isidx((move)->fromfile) && isidx((move)->fromrow) && \ | |
| 99 isidx((move)->tofile) && isidx((move)->torow)) | |
| 100 | |
| 101 /* secure versions - use, if index is not checked with isidx() */ | |
| 102 #define fileidx_s(c) (isfile(c)?fileidx(c):POS_UNSPECIFIED) | |
| 103 #define rowidx_s(c) (isrow(c)?rowidx(c):POS_UNSPECIFIED) | |
| 104 | |
| 105 /** | |
| 106 * Maps a character to a piece. | |
| 107 * | |
| 108 * Does not work for pawns, since they don't have a character. | |
| 109 * | |
| 110 * @param c one of R,N,B,Q,K | |
| 111 * @return numeric value for the specified piece | |
| 112 */ | |
| 113 uint8_t getpiece(char c); | |
| 114 | |
| 115 /** | |
| 116 * Maps a piece to a character. | |
| 117 * | |
| 118 * Does not work for pawns, scince they don't have a character. | |
| 119 * | |
| 120 * @param piece one of ROOK, KNIGHT, BISHOP, QUEEN, KING | |
| 121 * @return character value for the specified piece | |
| 122 */ | |
| 123 char getpiecechr(uint8_t piece); | |
| 124 | |
| 125 /** | |
| 126 * Evaluates a move syntactically and stores the move data in the specified | |
| 127 * object. | |
| 128 * | |
| 129 * @param board the current state of the board | |
| 130 * @param mycolor the color of the current player | |
| 131 * @param mstr the input string to parse | |
| 132 * @param move a pointer to object where the move data shall be stored | |
| 133 * @return status code (see rules/rules.h for the list of codes) | |
| 134 */ | |
| 135 int eval_move(Board board, uint8_t mycolor, char *mstr, Move *move); | |
| 136 | |
| 137 /** | |
| 138 * Validates move by applying chess rules. | |
| 139 * @param board the current board state | |
| 140 * @param move the move to validate | |
| 141 * @return TRUE, if the move complies to chess rules, FALSE otherwise | |
| 142 */ | |
| 143 _Bool validate_move(Board board, Move *move); | |
| 144 | |
| 145 /** | |
| 146 * Applies a move and deletes captured pieces. | |
| 147 * | |
| 148 * @param board the current board state | |
| 149 * @param move the move to apply | |
| 150 */ | |
| 151 void apply_move(Board board, Move *move); | |
| 152 | |
| 153 #endif /* RULES_H */ | |
| 154 |
