Mercurial > hg > terminal-chess / file comparison
comparison: src/chess/pawn.c
src/chess/pawn.c
- changeset 19
- 6a26114297a1
- parent 18
- 6008840b859e
- child 23
- 824c9522ce66
equal
deleted
inserted
replaced
| 18:6008840b859e | 19:6a26114297a1 |
|---|---|
| 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 #include "pawn.h" | |
| 31 #include "rules.h" | |
| 32 | |
| 33 _Bool pawn_chkrules(Board board, Move *move) { | |
| 34 int8_t d = ((move->piece & COLOR_MASK) == WHITE ? -1 : 1); | |
| 35 | |
| 36 if (move->torow == (d < 0 ? 7 : 0)) { | |
| 37 if (move->promotion) { | |
| 38 uint8_t promopiece = move->promotion & PIECE_MASK; | |
| 39 if (!promopiece || promopiece == PAWN || promopiece == KING) { | |
| 40 return 0; | |
| 41 } | |
| 42 } else { | |
| 43 return 0; | |
| 44 } | |
| 45 } else { | |
| 46 if (move->promotion) { | |
| 47 return 0; | |
| 48 } | |
| 49 } | |
| 50 | |
| 51 if (move->capture) { | |
| 52 if (move->fromrow == move->torow + d && ( | |
| 53 move->fromfile == move->tofile + 1 || | |
| 54 move->fromfile == move->tofile - 1)) { | |
| 55 | |
| 56 return mdst(board,move) | |
| 57 || (board[move->fromrow][move->tofile] & ENPASSANT_THREAT); | |
| 58 } else { | |
| 59 return 0; | |
| 60 } | |
| 61 } else { | |
| 62 if (move->fromfile == move->tofile) { | |
| 63 return (move->fromrow == move->torow + d) || | |
| 64 (move->fromrow == (d < 0 ? 1 : 6) && /* advanced first move */ | |
| 65 move->fromrow == move->torow + d*2); | |
| 66 } else { | |
| 67 return 0; | |
| 68 } | |
| 69 } | |
| 70 } | |
| 71 | |
| 72 _Bool pawn_isblocked(Board board, Move *move) { | |
| 73 return mdst(board,move) && !move->capture; | |
| 74 } | |
| 75 | |
| 76 int pawn_getlocation(Board board, Move *move) { | |
| 77 int8_t d = ((move->piece & COLOR_MASK) == WHITE ? -1 : 1); | |
| 78 | |
| 79 if (move->fromfile == POS_UNSPECIFIED) { | |
| 80 move->fromfile = move->tofile; | |
| 81 } | |
| 82 move->fromrow = move->torow + d; | |
| 83 if (move->fromrow > 6) { | |
| 84 return INVALID_POSITION; | |
| 85 } else { | |
| 86 /* advanced first move */ | |
| 87 if (move->fromrow == (d < 0 ? 2 : 5) && | |
| 88 msrc(board,move) != move->piece) { | |
| 89 | |
| 90 move->fromrow += d; | |
| 91 if (move->fromrow > 6) { | |
| 92 return INVALID_POSITION; | |
| 93 } | |
| 94 } | |
| 95 } | |
| 96 return VALID_MOVE_SYNTAX; | |
| 97 } |
