1 /* |
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. |
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3 * |
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4 * Copyright 2014 Mike Becker. All rights reserved. |
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5 * |
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6 * Redistribution and use in source and binary forms, with or without |
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7 * modification, are permitted provided that the following conditions are met: |
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8 * |
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9 * 1. Redistributions of source code must retain the above copyright |
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10 * notice, this list of conditions and the following disclaimer. |
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11 * |
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12 * 2. Redistributions in binary form must reproduce the above copyright |
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13 * notice, this list of conditions and the following disclaimer in the |
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14 * documentation and/or other materials provided with the distribution. |
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15 * |
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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26 * POSSIBILITY OF SUCH DAMAGE. |
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27 * |
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28 */ |
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29 |
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30 #include "pawn.h" |
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31 #include "rules.h" |
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32 |
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33 _Bool pawn_chkrules(Board board, Move *move) { |
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34 int8_t d = ((move->piece & COLOR_MASK) == WHITE ? -1 : 1); |
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35 |
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36 if (move->torow == (d < 0 ? 7 : 0)) { |
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37 if (move->promotion) { |
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38 uint8_t promopiece = move->promotion & PIECE_MASK; |
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39 if (!promopiece || promopiece == PAWN || promopiece == KING) { |
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40 return FALSE; |
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41 } |
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42 } else { |
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43 return FALSE; |
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44 } |
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45 } else { |
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46 if (move->promotion) { |
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47 return FALSE; |
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48 } |
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49 } |
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50 |
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51 if (move->capture) { |
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52 if (move->fromrow == move->torow + d && ( |
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53 move->fromfile == move->tofile + 1 || |
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54 move->fromfile == move->tofile - 1)) { |
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55 |
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56 return mdst(board,move) |
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57 || (board[move->fromrow][move->tofile] & ENPASSANT_THREAT); |
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58 } else { |
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59 return FALSE; |
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60 } |
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61 } else { |
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62 if (move->fromfile == move->tofile) { |
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63 return (move->fromrow == move->torow + d) || |
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64 (move->fromrow == (d < 0 ? 1 : 6) && /* advanced first move */ |
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65 move->fromrow == move->torow + d*2); |
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66 } else { |
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67 return FALSE; |
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68 } |
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69 } |
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70 } |
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71 |
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72 _Bool pawn_isblocked(Board board, Move *move) { |
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73 return mdst(board,move) && !move->capture; |
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74 } |
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75 |
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76 int pawn_getlocation(Board board, Move *move) { |
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77 int8_t d = ((move->piece & COLOR_MASK) == WHITE ? -1 : 1); |
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78 |
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79 if (move->fromfile == POS_UNSPECIFIED) { |
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80 move->fromfile = move->tofile; |
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81 } |
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82 move->fromrow = move->torow + d; |
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83 if (move->fromrow > 6) { |
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84 return INVALID_POSITION; |
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85 } else { |
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86 /* advanced first move */ |
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87 if (move->fromrow == (d < 0 ? 2 : 5) && |
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88 msrc(board,move) != move->piece) { |
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89 |
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90 move->fromrow += d; |
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91 if (move->fromrow > 6) { |
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92 return INVALID_POSITION; |
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93 } |
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94 } |
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95 } |
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96 return VALID_MOVE_SYNTAX; |
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97 } |
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