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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 "rules.h" |
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31 | #include "chess.h" |
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32 | #include <string.h> |
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33 | #include <stdlib.h> |
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34 | #include <sys/time.h> |
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35 | |
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36 | void gamestate_cleanup(GameState *gamestate) { |
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37 | MoveList *elem; |
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38 | elem = gamestate->movelist; |
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39 | while (elem) { |
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40 | MoveList *cur = elem; |
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41 | elem = elem->next; |
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42 | free(cur); |
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43 | }; |
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44 | } |
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45 | |
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46 | static void addmove(GameState* gamestate, Move *move) { |
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47 | MoveList *elem = malloc(sizeof(MoveList)); |
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48 | elem->next = NULL; |
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49 | elem->move = *move; |
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50 | |
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51 | gettimeofday(&(elem->move.timestamp), NULL); |
33 | 52 | |
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53 | if (gamestate->lastmove) { |
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54 | struct timeval *lasttstamp = &(gamestate->lastmove->move.timestamp); |
33 | 55 | time_t sec = elem->move.timestamp.tv_sec - lasttstamp->tv_sec; |
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56 | suseconds_t micros; |
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57 | if (elem->move.timestamp.tv_usec < lasttstamp->tv_usec) { |
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58 | micros = 1e6L-(lasttstamp->tv_usec - elem->move.timestamp.tv_usec); |
33 | 59 | sec--; |
60 | } else { | |
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61 | micros = elem->move.timestamp.tv_usec - lasttstamp->tv_usec; |
33 | 62 | } |
63 | ||
64 | elem->move.movetime.tv_sec = sec; | |
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65 | elem->move.movetime.tv_usec = micros; |
33 | 66 | |
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67 | gamestate->lastmove->next = elem; |
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68 | gamestate->lastmove = elem; |
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69 | } else { |
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70 | elem->move.movetime.tv_usec = 0; |
33 | 71 | elem->move.movetime.tv_sec = 0; |
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72 | gamestate->movelist = gamestate->lastmove = elem; |
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73 | } |
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74 | } |
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75 | |
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76 | char getpiecechr(uint8_t piece) { |
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77 | switch (piece & PIECE_MASK) { |
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78 | case ROOK: return 'R'; |
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79 | case KNIGHT: return 'N'; |
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80 | case BISHOP: return 'B'; |
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81 | case QUEEN: return 'Q'; |
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82 | case KING: return 'K'; |
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83 | default: return '\0'; |
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84 | } |
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85 | } |
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86 | |
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87 | uint8_t getpiece(char c) { |
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88 | switch (c) { |
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89 | case 'R': return ROOK; |
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90 | case 'N': return KNIGHT; |
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91 | case 'B': return BISHOP; |
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92 | case 'Q': return QUEEN; |
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93 | case 'K': return KING; |
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94 | default: return 0; |
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95 | } |
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96 | } |
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97 | |
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98 | static int getlocation(GameState *gamestate, Move *move) { |
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99 | uint8_t piece = move->piece & PIECE_MASK; |
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100 | switch (piece) { |
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101 | case PAWN: return pawn_getlocation(gamestate, move); |
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102 | case ROOK: return rook_getlocation(gamestate, move); |
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103 | case KNIGHT: return knight_getlocation(gamestate, move); |
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104 | case BISHOP: return bishop_getlocation(gamestate, move); |
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105 | case QUEEN: return queen_getlocation(gamestate, move); |
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106 | case KING: return king_getlocation(gamestate, move); |
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107 | default: return INVALID_MOVE_SYNTAX; |
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108 | } |
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109 | } |
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110 | |
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111 | void apply_move(GameState *gamestate, Move *move) { |
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112 | uint8_t piece = move->piece & PIECE_MASK; |
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113 | uint8_t color = move->piece & COLOR_MASK; |
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114 | |
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115 | /* en passant capture */ |
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116 | if (move->capture && piece == PAWN && |
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117 | mdst(gamestate->board, move) == 0) { |
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118 | gamestate->board[move->fromrow][move->tofile] = 0; |
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119 | } |
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120 | |
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121 | /* remove old en passant threats */ |
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122 | for (uint8_t file = 0 ; file < 8 ; file++) { |
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123 | gamestate->board[3][file] &= ~ENPASSANT_THREAT; |
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124 | gamestate->board[4][file] &= ~ENPASSANT_THREAT; |
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125 | } |
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126 | |
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127 | /* add new en passant threat */ |
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128 | if (piece == PAWN && ( |
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129 | (move->fromrow == 1 && move->torow == 3) || |
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130 | (move->fromrow == 6 && move->torow == 4))) { |
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131 | move->piece |= ENPASSANT_THREAT; |
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132 | } |
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133 | |
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134 | /* move (and maybe capture or promote) */ |
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135 | msrc(gamestate->board, move) = 0; |
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136 | if (move->promotion) { |
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137 | mdst(gamestate->board, move) = move->promotion; |
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138 | } else { |
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139 | mdst(gamestate->board, move) = move->piece; |
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140 | } |
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141 | |
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142 | /* castling */ |
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143 | if (piece == KING && |
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144 | move->fromfile == fileidx('e')) { |
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145 | |
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146 | if (move->tofile == fileidx('g')) { |
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147 | gamestate->board[move->torow][fileidx('h')] = 0; |
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148 | gamestate->board[move->torow][fileidx('f')] = color|ROOK; |
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149 | } else if (move->tofile == fileidx('c')) { |
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150 | gamestate->board[move->torow][fileidx('a')] = 0; |
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151 | gamestate->board[move->torow][fileidx('d')] = color|ROOK; |
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152 | } |
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153 | } |
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154 | |
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155 | addmove(gamestate, move); |
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156 | } |
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157 | |
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158 | static _Bool validate_move_rules(GameState *gamestate, Move *move) { |
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159 | /* validate indices (don't trust opponent) */ |
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160 | if (!chkidx(move)) { |
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161 | return 0; |
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162 | } |
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163 | |
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164 | /* must move */ |
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165 | if (move->fromfile == move->tofile && move->fromrow == move->torow) { |
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166 | return 0; |
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167 | } |
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168 | |
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169 | /* does piece exist */ |
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170 | if (msrc(gamestate->board, move) != move->piece) { |
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171 | return 0; |
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172 | } |
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173 | |
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174 | /* can't capture own pieces */ |
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175 | if ((mdst(gamestate->board, move) & COLOR_MASK) |
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176 | == (move->piece & COLOR_MASK)) { |
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177 | return 0; |
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178 | } |
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179 | |
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180 | /* validate individual rules */ |
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181 | switch (move->piece & PIECE_MASK) { |
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182 | case PAWN: |
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183 | return pawn_chkrules(gamestate, move) && |
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184 | !pawn_isblocked(gamestate, move); |
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185 | case ROOK: |
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186 | return rook_chkrules(move) && |
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187 | !rook_isblocked(gamestate, move); |
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188 | case KNIGHT: |
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189 | return knight_chkrules(move); /* knight is never blocked */ |
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190 | case BISHOP: |
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191 | return bishop_chkrules(move) && |
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192 | !bishop_isblocked(gamestate, move); |
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193 | case QUEEN: |
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194 | return queen_chkrules(move) && |
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195 | !queen_isblocked(gamestate, move); |
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196 | case KING: |
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197 | return king_chkrules(gamestate, move) && |
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198 | !king_isblocked(gamestate, move); |
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199 | default: |
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200 | return 0; |
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201 | } |
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202 | } |
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203 | |
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204 | _Bool validate_move(GameState *gamestate, Move *move) { |
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205 | |
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206 | _Bool result = validate_move_rules(gamestate, move); |
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207 | |
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208 | /* cancel processing to save resources */ |
25 | 209 | if (!result) { |
210 | return 0; | |
211 | } | |
212 | ||
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213 | /* find kings for check validation */ |
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214 | uint8_t piececolor = (move->piece & COLOR_MASK); |
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215 | |
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216 | uint8_t mykingfile = 0, mykingrow = 0, opkingfile = 0, opkingrow = 0; |
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217 | for (uint8_t row = 0 ; row < 8 ; row++) { |
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218 | for (uint8_t file = 0 ; file < 8 ; file++) { |
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219 | if (gamestate->board[row][file] == |
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220 | (piececolor == WHITE?WKING:BKING)) { |
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221 | mykingfile = file; |
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222 | mykingrow = row; |
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223 | } else if (gamestate->board[row][file] == |
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224 | (piececolor == WHITE?BKING:WKING)) { |
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225 | opkingfile = file; |
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226 | opkingrow = row; |
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227 | } |
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228 | } |
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229 | } |
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230 | |
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231 | /* simulation move for check validation */ |
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232 | GameState simulation; |
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233 | memcpy(&simulation, gamestate, sizeof(GameState)); |
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234 | apply_move(&simulation, move); |
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235 | |
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236 | /* don't move into or stay in check position */ |
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237 | if (is_covered(&simulation, mykingrow, mykingfile, |
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238 | opponent_color(piececolor))) { |
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239 | return 0; |
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240 | } |
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241 | |
25 | 242 | /* correct check and checkmate flags (move is still valid) */ |
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243 | Move threats[16]; |
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244 | uint8_t threatcount; |
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245 | move->check = get_threats(&simulation, opkingrow, opkingfile, |
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246 | piececolor, threats, &threatcount); |
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247 | |
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248 | if (move->check) { |
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249 | /* determine possible escape fields */ |
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250 | _Bool canescape = 0; |
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251 | for (int dr = -1 ; dr <= 1 && !canescape ; dr++) { |
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252 | for (int df = -1 ; df <= 1 && !canescape ; df++) { |
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253 | if (!(dr == 0 && df == 0) && |
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254 | isidx(opkingrow + dr) && isidx(opkingfile + df)) { |
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255 | |
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256 | /* escape field neither blocked nor covered */ |
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257 | if ((simulation.board[opkingrow + dr][opkingfile + df] |
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258 | & COLOR_MASK) != opponent_color(piececolor)) { |
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259 | canescape |= !is_covered(&simulation, |
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260 | opkingrow + dr, opkingfile + df, piececolor); |
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261 | } |
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262 | } |
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263 | } |
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264 | } |
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265 | /* can't escape, can he capture? */ |
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266 | if (!canescape && threatcount == 1) { |
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267 | canescape = is_attacked(&simulation, threats[0].fromrow, |
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268 | threats[0].fromfile, opponent_color(piececolor)); |
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269 | } |
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270 | |
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271 | /* can't capture, can he block? */ |
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272 | if (!canescape && threatcount == 1) { |
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273 | Move *threat = &(threats[0]); |
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274 | uint8_t threatpiece = threat->piece & PIECE_MASK; |
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275 | |
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276 | /* knight, pawns and the king cannot be blocked */ |
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277 | if (threatpiece == BISHOP || threatpiece == ROOK |
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278 | || threatpiece == QUEEN) { |
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279 | if (threat->fromrow == threat->torow) { |
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280 | /* rook aspect (on row) */ |
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281 | int d = threat->tofile > threat->fromfile ? 1 : -1; |
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282 | uint8_t file = threat->fromfile; |
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283 | while (!canescape && file != threat->tofile - d) { |
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284 | file += d; |
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285 | canescape |= is_protected(&simulation, |
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286 | threat->torow, file, opponent_color(piececolor)); |
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287 | } |
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288 | } else if (threat->fromfile == threat->tofile) { |
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289 | /* rook aspect (on file) */ |
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290 | int d = threat->torow > threat->fromrow ? 1 : -1; |
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291 | uint8_t row = threat->fromrow; |
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292 | while (!canescape && row != threat->torow - d) { |
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293 | row += d; |
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294 | canescape |= is_protected(&simulation, |
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295 | row, threat->tofile, opponent_color(piececolor)); |
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296 | } |
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297 | } else { |
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298 | /* bishop aspect */ |
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299 | int dr = move->torow > move->fromrow ? 1 : -1; |
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300 | int df = move->tofile > move->fromfile ? 1 : -1; |
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301 | |
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302 | uint8_t row = move->fromrow; |
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303 | uint8_t file = move->fromfile; |
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304 | while (!canescape && file != move->tofile - df |
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305 | && row != move->torow - dr) { |
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306 | row += dr; |
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307 | file += df; |
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308 | canescape |= is_protected(&simulation, row, file, |
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309 | opponent_color(piececolor)); |
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310 | } |
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311 | } |
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312 | } |
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313 | } |
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314 | |
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315 | if (!canescape) { |
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316 | gamestate->checkmate = 1; |
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317 | } |
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318 | } |
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319 | |
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320 | return 1; |
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321 | } |
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322 | |
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323 | int eval_move(GameState *gamestate, char *mstr, Move *move) { |
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324 | memset(move, 0, sizeof(Move)); |
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325 | move->fromfile = POS_UNSPECIFIED; |
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326 | move->fromrow = POS_UNSPECIFIED; |
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327 | |
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328 | size_t len = strlen(mstr); |
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329 | |
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330 | /* evaluate check/checkmate flags */ |
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331 | if (mstr[len-1] == '+') { |
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332 | len--; mstr[len] = '\0'; |
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333 | move->check = 1; |
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334 | } else if (mstr[len-1] == '#') { |
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335 | len--; mstr[len] = '\0'; |
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336 | /* ignore - validation should set game state */ |
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337 | } |
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338 | |
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339 | /* evaluate promotion */ |
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340 | if (len > 3 && mstr[len-2] == '=') { |
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341 | move->promotion = getpiece(mstr[len-1]); |
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342 | if (!move->promotion) { |
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343 | return INVALID_MOVE_SYNTAX; |
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344 | } else { |
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345 | move->promotion |= gamestate->mycolor; |
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346 | len -= 2; |
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347 | mstr[len] = 0; |
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348 | } |
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349 | } |
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350 | |
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351 | if (len == 2) { |
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352 | /* pawn move (e.g. "e4") */ |
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353 | move->piece = PAWN; |
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354 | move->tofile = fileidx(mstr[0]); |
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355 | move->torow = rowidx(mstr[1]); |
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356 | } else if (len == 3) { |
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357 | if (strcmp(mstr, "O-O") == 0) { |
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358 | /* king side castling */ |
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359 | move->piece = KING; |
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360 | move->fromfile = fileidx('e'); |
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361 | move->tofile = fileidx('g'); |
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362 | move->fromrow = move->torow = gamestate->mycolor == WHITE ? 0 : 7; |
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363 | } else { |
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364 | /* move (e.g. "Nf3") */ |
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365 | move->piece = getpiece(mstr[0]); |
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366 | move->tofile = fileidx(mstr[1]); |
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367 | move->torow = rowidx(mstr[2]); |
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368 | } |
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369 | |
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370 | } else if (len == 4) { |
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371 | move->piece = getpiece(mstr[0]); |
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372 | if (!move->piece) { |
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373 | move->piece = PAWN; |
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374 | move->fromfile = fileidx(mstr[0]); |
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375 | } |
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376 | if (mstr[1] == 'x') { |
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377 | /* capture (e.g. "Nxf3", "dxe5") */ |
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378 | move->capture = 1; |
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379 | } else { |
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380 | /* move (e.g. "Ndf3", "N2c3", "e2e4") */ |
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381 | if (isfile(mstr[1])) { |
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382 | move->fromfile = fileidx(mstr[1]); |
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383 | if (move->piece == PAWN) { |
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384 | move->piece = 0; |
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385 | } |
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386 | } else { |
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387 | move->fromrow = rowidx(mstr[1]); |
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388 | } |
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389 | } |
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390 | move->tofile = fileidx(mstr[2]); |
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391 | move->torow = rowidx(mstr[3]); |
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392 | } else if (len == 5) { |
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393 | if (strcmp(mstr, "O-O-O") == 0) { |
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394 | /* queen side castling "O-O-O" */ |
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395 | move->piece = KING; |
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396 | move->fromfile = fileidx('e'); |
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397 | move->tofile = fileidx('c'); |
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398 | move->fromrow = move->torow = gamestate->mycolor == WHITE ? 0 : 7; |
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399 | } else { |
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400 | move->piece = getpiece(mstr[0]); |
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401 | if (mstr[2] == 'x') { |
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402 | move->capture = 1; |
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403 | if (move->piece) { |
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404 | /* capture (e.g. "Ndxf3") */ |
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405 | move->fromfile = fileidx(mstr[1]); |
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406 | } else { |
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407 | /* long notation capture (e.g. "e5xf6") */ |
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408 | move->piece = PAWN; |
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409 | move->fromfile = fileidx(mstr[0]); |
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410 | move->fromrow = rowidx(mstr[1]); |
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411 | } |
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412 | } else { |
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413 | /* long notation move (e.g. "Nc5a4") */ |
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414 | move->fromfile = fileidx(mstr[1]); |
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415 | move->fromrow = rowidx(mstr[2]); |
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416 | } |
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417 | move->tofile = fileidx(mstr[3]); |
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418 | move->torow = rowidx(mstr[4]); |
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419 | } |
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420 | } else if (len == 6) { |
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421 | /* long notation capture (e.g. "Nc5xf3") */ |
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422 | if (mstr[3] == 'x') { |
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423 | move->capture = 1; |
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424 | move->piece = getpiece(mstr[0]); |
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425 | move->fromfile = fileidx(mstr[1]); |
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426 | move->fromrow = rowidx(mstr[2]); |
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427 | move->tofile = fileidx(mstr[4]); |
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428 | move->torow = rowidx(mstr[5]); |
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429 | } |
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430 | } |
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431 | |
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432 | |
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433 | if (move->piece) { |
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434 | if (move->piece == PAWN |
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435 | && move->torow == (gamestate->mycolor==WHITE?7:0) |
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436 | && !move->promotion) { |
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437 | return NEED_PROMOTION; |
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438 | } |
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439 | |
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440 | move->piece |= gamestate->mycolor; |
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441 | if (move->fromfile == POS_UNSPECIFIED |
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442 | || move->fromrow == POS_UNSPECIFIED) { |
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443 | return getlocation(gamestate, move); |
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444 | } else { |
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445 | return chkidx(move) ? VALID_MOVE_SYNTAX : INVALID_POSITION; |
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446 | } |
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447 | } else { |
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448 | return INVALID_MOVE_SYNTAX; |
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449 | } |
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450 | } |
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451 | |
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452 | _Bool get_threats(GameState *gamestate, uint8_t row, uint8_t file, |
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453 | uint8_t color, Move *threats, uint8_t *threatcount) { |
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454 | Move candidates[16]; |
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455 | int candidatecount = 0; |
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456 | for (uint8_t r = 0 ; r < 8 ; r++) { |
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457 | for (uint8_t f = 0 ; f < 8 ; f++) { |
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458 | if ((gamestate->board[r][f] & COLOR_MASK) == color) { |
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459 | memset(&(candidates[candidatecount]), 0, sizeof(Move)); |
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460 | candidates[candidatecount].piece = gamestate->board[r][f]; |
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461 | candidates[candidatecount].fromrow = r; |
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462 | candidates[candidatecount].fromfile = f; |
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463 | candidates[candidatecount].torow = row; |
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464 | candidates[candidatecount].tofile = file; |
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465 | candidatecount++; |
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466 | } |
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467 | } |
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468 | } |
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469 | |
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470 | if (threatcount) { |
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471 | *threatcount = 0; |
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472 | } |
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473 | |
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474 | |
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475 | _Bool result = 0; |
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476 | |
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477 | for (int i = 0 ; i < candidatecount ; i++) { |
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478 | if (validate_move_rules(gamestate, &(candidates[i]))) { |
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479 | result = 1; |
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480 | if (threats && threatcount) { |
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481 | threats[(*threatcount)++] = candidates[i]; |
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482 | } |
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483 | } |
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484 | } |
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485 | |
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486 | return result; |
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487 | } |
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488 | |
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489 | _Bool get_real_threats(GameState *gamestate, uint8_t row, uint8_t file, |
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490 | uint8_t color, Move *threats, uint8_t *threatcount) { |
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491 | |
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492 | Move candidates[16]; |
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493 | uint8_t candidatecount; |
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494 | if (get_threats(gamestate, row, file, color, candidates, &candidatecount)) { |
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495 | |
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496 | if (threatcount) { |
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497 | *threatcount = 0; |
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498 | } |
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499 | _Bool result = 0; |
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500 | uint8_t kingfile = 0, kingrow = 0; |
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501 | for (uint8_t row = 0 ; row < 8 ; row++) { |
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502 | for (uint8_t file = 0 ; file < 8 ; file++) { |
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503 | if ((gamestate->board[row][file] & COLOR_MASK) == color) { |
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504 | kingfile = file; |
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505 | kingrow = row; |
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506 | } |
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507 | } |
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508 | } |
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509 | |
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510 | for (uint8_t i = 0 ; i < candidatecount ; i++) { |
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511 | GameState simulation; |
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512 | memcpy(&simulation, gamestate, sizeof(GameState)); |
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513 | apply_move(&simulation, &(candidates[i])); |
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514 | if (!is_covered(&simulation, kingrow, kingfile, |
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515 | opponent_color(color))) { |
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516 | result = 1; |
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517 | if (threats && threatcount) { |
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518 | threats[(*threatcount)++] = candidates[i]; |
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519 | } |
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520 | } |
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521 | } |
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522 | |
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523 | return result; |
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524 | } else { |
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525 | return 0; |
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526 | } |
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527 | } |
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528 | |
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529 | _Bool is_protected(GameState *gamestate, uint8_t row, uint8_t file, |
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530 | uint8_t color) { |
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531 | |
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532 | Move threats[16]; |
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533 | uint8_t threatcount; |
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534 | if (get_real_threats(gamestate, row, file, color, threats, &threatcount)) { |
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535 | for (int i = 0 ; i < threatcount ; i++) { |
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536 | if (threats[i].piece != (color|KING)) { |
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537 | return 1; |
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538 | } |
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539 | } |
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540 | return 0; |
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541 | } else { |
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542 | return 0; |
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543 | } |
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544 | } |
33 | 545 | |
546 | uint16_t remaining_movetime(GameInfo *gameinfo, GameState *gamestate, | |
547 | uint8_t color) { | |
548 | if (!gameinfo->timecontrol) { | |
549 | return 0; | |
550 | } | |
551 | ||
552 | if (gamestate->movelist) { | |
553 | uint16_t time = gameinfo->time; | |
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554 | suseconds_t micros = 0; |
33 | 555 | |
556 | MoveList *movelist = color == WHITE ? | |
557 | gamestate->movelist : gamestate->movelist->next; | |
558 | ||
559 | while (movelist) { | |
560 | time += gameinfo->addtime; | |
561 | ||
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562 | struct timeval *movetime = &(movelist->move.movetime); |
33 | 563 | if (movetime->tv_sec >= time) { |
564 | return 0; | |
565 | } | |
566 | ||
567 | time -= movetime->tv_sec; | |
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568 | micros += movetime->tv_usec; |
33 | 569 | |
570 | movelist = movelist->next ? movelist->next->next : NULL; | |
571 | } | |
572 | ||
573 | time_t sec; | |
574 | movelist = gamestate->lastmove; | |
575 | if ((movelist->move.piece & COLOR_MASK) != color) { | |
36
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576 | struct timeval *lastmovetstamp = &(movelist->move.timestamp); |
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577 | struct timeval currenttstamp; |
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578 | gettimeofday(¤ttstamp, NULL); |
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579 | micros += currenttstamp.tv_usec - lastmovetstamp->tv_usec; |
33 | 580 | sec = currenttstamp.tv_sec - lastmovetstamp->tv_sec; |
581 | if (sec >= time) { | |
582 | return 0; | |
583 | } | |
584 | ||
585 | time -= sec; | |
586 | } | |
587 | ||
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588 | sec = micros / 1e6L; |
33 | 589 | |
590 | if (sec >= time) { | |
591 | return 0; | |
592 | } | |
593 | ||
594 | time -= sec; | |
595 | ||
596 | return time; | |
597 | } else { | |
598 | return gameinfo->time; | |
599 | } | |
600 | } |