src/chess/rules.h

Wed, 16 Apr 2014 22:20:59 +0200

author
Mike Becker <universe@uap-core.de>
date
Wed, 16 Apr 2014 22:20:59 +0200
changeset 43
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parent 41
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child 47
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permissions
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changed netcode numbers

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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 #ifndef RULES_H
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31 #define RULES_H
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32
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33 #include <stdint.h>
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34 #include <sys/time.h>
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35
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36 #define VALID_MOVE_SYNTAX 0
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37 #define INVALID_MOVE_SYNTAX 1
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38 #define INVALID_POSITION 2
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39 #define AMBIGUOUS_MOVE 3
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40 #define NEED_PROMOTION 4
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41
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42
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43 #define PIECE_MASK 0x0F
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44 #define COLOR_MASK 0x30
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45 #define ENPASSANT_THREAT 0x40
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46
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47 #define WHITE 0x10
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48 #define BLACK 0x20
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49
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50 #define PAWN 0x01
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51 #define ROOK 0x02
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52 #define KNIGHT 0x03
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53 #define BISHOP 0x04
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54 #define QUEEN 0x05
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55 #define KING 0x06
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56
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57 #define WPAWN (WHITE|PAWN)
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58 #define WROOK (WHITE|ROOK)
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59 #define WKNIGHT (WHITE|KNIGHT)
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60 #define WBISHOP (WHITE|BISHOP)
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61 #define WQUEEN (WHITE|QUEEN)
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62 #define WKING (WHITE|KING)
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63 #define BPAWN (BLACK|PAWN)
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64 #define BROOK (BLACK|ROOK)
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65 #define BKNIGHT (BLACK|KNIGHT)
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66 #define BBISHOP (BLACK|BISHOP)
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67 #define BQUEEN (BLACK|QUEEN)
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68 #define BKING (BLACK|KING)
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69
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70 typedef uint8_t Board[8][8];
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71
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72 struct movetimeval {
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73 uint64_t tv_sec;
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74 int32_t tv_usec;
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75 };
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76
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77 typedef struct {
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78 uint8_t piece;
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79 uint8_t fromfile;
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80 uint8_t fromrow;
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81 uint8_t tofile;
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82 uint8_t torow;
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83 uint8_t promotion;
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84 uint8_t check;
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85 uint8_t capture;
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86 struct movetimeval timestamp;
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87 struct movetimeval movetime;
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88 } Move;
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89
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90 typedef struct MoveList MoveList;
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91
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92 struct MoveList {
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93 Move move;
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94 MoveList* next;
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95 };
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96
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97
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98 typedef struct {
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99 uint8_t servercolor;
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100 uint8_t timecontrol;
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101 uint16_t time;
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102 uint16_t addtime;
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103 } GameInfo;
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104
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105 typedef struct {
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106 Board board;
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107 uint8_t mycolor;
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108 MoveList* movelist;
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109 MoveList* lastmove;
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110 _Bool checkmate;
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111 _Bool stalemate;
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112 } GameState;
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113
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114 #define opponent_color(color) ((color)==WHITE?BLACK:WHITE)
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115
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116 #define POS_UNSPECIFIED UINT8_MAX
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117 #define mdst(b,m) b[(m)->torow][(m)->tofile]
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118 #define msrc(b,m) b[(m)->fromrow][(m)->fromfile]
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119
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120 #define isidx(idx) ((uint8_t)(idx) < 8)
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121
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122 #define isfile(file) (file >= 'a' && file <= 'h')
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123 #define isrow(row) (row >= '1' && row <= '8')
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124
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125 #define rowidx(row) (row-'1')
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126 #define fileidx(file) (file-'a')
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127
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128 #define rowchr(row) (row+'1')
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129 #define filechr(file) (file+'a')
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130
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131 #define chkidx(move) (isidx((move)->fromfile) && isidx((move)->fromrow) && \
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132 isidx((move)->tofile) && isidx((move)->torow))
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133
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134 /* secure versions - use, if index is not checked with isidx() */
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135 #define fileidx_s(c) (isfile(c)?fileidx(c):POS_UNSPECIFIED)
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136 #define rowidx_s(c) (isrow(c)?rowidx(c):POS_UNSPECIFIED)
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137
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138 void gamestate_cleanup(GameState *gamestate);
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139
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140 /**
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141 * Maps a character to a piece.
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142 *
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143 * Does not work for pawns, since they don't have a character.
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144 *
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145 * @param c one of R,N,B,Q,K
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146 * @return numeric value for the specified piece
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147 */
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148 uint8_t getpiece(char c);
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149
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150 /**
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151 * Maps a piece to a character.
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152 *
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153 * Does not work for pawns, scince they don't have a character.
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154 *
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155 * @param piece one of ROOK, KNIGHT, BISHOP, QUEEN, KING
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156 * @return character value for the specified piece
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157 */
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158 char getpiecechr(uint8_t piece);
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159
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160 /**
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161 * Checks, if a specified field is covered by a piece of a certain color.
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162 *
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163 * The out-parameters may both be NULL, but if any of them is set, the other
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164 * must be set, too.
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165 *
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166 * @param gamestate the current game state
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167 * @param row row of the field to check
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168 * @param file file of the field to check
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169 * @param color the color of the piece that should threaten the field
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170 * @param threats the array where to store the threats (should be able to the
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171 * rare maximum of 16 elements)
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172 * @param threatcount a pointer to an uint8_t where to store the amount of threats
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173 * @return TRUE, if any piece of the specified color threatens the specified
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174 * field (i.e. could capture an opponent piece)
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175 */
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176 _Bool get_threats(GameState *gamestate, uint8_t row, uint8_t file,
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177 uint8_t color, Move* threats, uint8_t* threatcount);
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178
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179 /**
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180 * Checks, if a specified field is covered by a piece of a certain color AND
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181 * if this piece is not pinned and therefore able to perform the move.
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182 *
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183 * The out-parameters may both be NULL, but if any of them is set, the other
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184 * must be set, too.
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185 *
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186 * @param gamestate the current game state
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187 * @param row row of the field to check
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188 * @param file file of the field to check
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189 * @param color the color of the piece that should threaten the field
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190 * @param threats the array where to store the threats (should be able to the
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191 * rare maximum of 16 elements)
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192 * @param threatcount a pointer to an uint8_t where to store the amount of threats
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193 * @return TRUE, if any piece of the specified color threatens the specified
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194 * field (i.e. could capture an opponent piece)
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195 */
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196 _Bool get_real_threats(GameState *gamestate, uint8_t row, uint8_t file,
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197 uint8_t color, Move* threats, uint8_t* threatcount);
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198
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199 /**
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200 * Checks, if a specified field is covered by a piece of a certain color.
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201 *
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202 * @param gamestate the current game state
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203 * @param row row of the field to check
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204 * @param file file of the field to check
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205 * @param color the color of the piece that should cover the field
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206 * @return TRUE, if any piece of the specified color threatens the specified
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207 * field
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208 */
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209 #define is_covered(gamestate, row, file, color) \
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210 get_threats(gamestate, row, file, color, NULL, NULL)
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211
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212 /**
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213 * Checks, if a specified field is attacked by a piece of a certain color.
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214 *
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215 * I.e. the field is covered by a piece AND this piece is not pinned and
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216 * therefore able to perform the move.
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217 *
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218 * @param gamestate the current game state
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219 * @param row row of the field to check
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220 * @param file file of the field to check
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221 * @param color the color of the piece that should cover the field
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222 * @return TRUE, if any piece of the specified color threatens the specified
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223 * field and could capture an opponent piece
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224 */
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225 #define is_attacked(gamestate, row, file, color) \
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226 get_threats(gamestate, row, file, color, NULL, NULL)
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227
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228 /**
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229 * Checks, if a specified field is protected by a piece of a certain color.
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230 *
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231 * I.e. the field is covered by a piece that is NOT the king AND this piece is
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232 * not pinned and therefore able to perform the move.
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233 *
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234 * @param gamestate the current game state
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235 * @param row row of the field to check
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236 * @param file file of the field to check
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237 * @param color the color of the piece that should cover the field
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238 * @return TRUE, if any piece (excluding the king) of the specified color
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239 * threatens the specified field and could capture an opponent piece
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240 */
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241 _Bool is_protected(GameState *gamestate, uint8_t row, uint8_t file,
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242 uint8_t color);
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243
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244 /**
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245 * Evaluates a move syntactically and stores the move data in the specified
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246 * object.
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247 *
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248 * @param gamestate the current game state
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249 * @param mstr the input string to parse
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250 * @param move a pointer to object where the move data shall be stored
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251 * @return status code (see rules/rules.h for the list of codes)
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252 */
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253 int eval_move(GameState *gamestate, char *mstr, Move *move);
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254
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255 /**
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256 * Validates move by applying chess rules.
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257 * @param gamestate the current game state
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258 * @param move the move to validate
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259 * @return TRUE, if the move complies to chess rules, FALSE otherwise
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260 */
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261 _Bool validate_move(GameState *gamestate, Move *move);
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262
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263 /**
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264 * Applies a move and deletes captured pieces.
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265 *
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266 * @param gamestate the current game state
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267 * @param move the move to apply
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268 */
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269 void apply_move(GameState *gamestate, Move *move);
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270
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271
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272 /**
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273 * Returns the remaining time on the clock for the specified player.
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274 *
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275 * @param gameinfo the information about the game
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276 * @param gamestate the current game state
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277 * @param color either BLACK or WHITE
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278 * @return the remaining time - if time control is disabled, this function
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279 * always returns zero
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280 */
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281 uint16_t remaining_movetime(GameInfo *gameinfo, GameState *gamestate,
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282 uint8_t color);
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283
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284 #endif /* RULES_H */
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285

mercurial