src/chess/king.c

Mon, 07 Apr 2014 14:08:57 +0200

author
Mike Becker <universe@uap-core.de>
date
Mon, 07 Apr 2014 14:08:57 +0200
changeset 29
c6a1ad6cf749
parent 25
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child 47
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permissions
-rw-r--r--

fixed checkmate and completed implementation (more testing is still advised)

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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 "king.h"
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32 #include <stdlib.h>
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33
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34 static _Bool king_castling_chkmoved(GameState *gamestate,
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35 uint8_t row, uint8_t file) {
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36
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37 MoveList *ml = gamestate->movelist;
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38 while (ml) {
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39 if (ml->move.fromfile == file && ml->move.fromrow == row) {
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40 return 1;
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41 }
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42 ml = ml->next;
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43 }
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44
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45 return 0;
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46 }
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47
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48 _Bool king_chkrules(GameState *gamestate, Move* move) {
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49 if (abs(move->torow - move->fromrow) <= 1 &&
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50 abs(move->tofile - move->fromfile) <= 1) {
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51 return 1;
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52 } else {
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53 /* castling */
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54 if (move->fromrow == move->torow &&
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55 move->fromrow == ((move->piece&COLOR_MASK) == WHITE ? 0 : 7) &&
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56 move->fromfile == fileidx('e') &&
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57 (move->tofile == fileidx('c') || move->tofile == fileidx('g'))) {
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58
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59 return !king_castling_chkmoved(gamestate,
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60 move->fromrow, move->fromfile) &&
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61 !king_castling_chkmoved(gamestate, move->fromrow,
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62 move->tofile == fileidx('c') ? 0 : 7);
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63 } else {
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64 return 0;
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65 }
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66 }
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67 }
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68
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69 _Bool king_isblocked(GameState *gamestate, Move *move) {
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70
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71 uint8_t opponent_color = opponent_color(move->piece&COLOR_MASK);
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72 _Bool blocked = is_covered(gamestate, move->torow, move->tofile,
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73 opponent_color);
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74
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75 if (abs(move->tofile - move->fromfile) == 2) {
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76 if (move->tofile == fileidx('c')) {
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77 blocked |= gamestate->board[move->torow][fileidx('b')];
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78 }
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79 uint8_t midfile = (move->tofile+move->fromfile)/2;
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80 blocked |= gamestate->lastmove->move.check ||
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81 gamestate->board[move->torow][midfile] ||
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82 is_covered(gamestate, move->torow, midfile, opponent_color);
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83 }
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84
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85 return blocked;
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86 }
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87
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88 int king_getlocation(GameState *gamestate, Move *move) {
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89
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90 uint8_t file, row;
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91
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92 for (int f = -1 ; f <= 1 ; f++) {
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93 for (int r = -1 ; r <= 1 ; r++) {
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94 if (f == 0 && r == 0) {
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95 continue;
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96 }
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97 file = move->tofile + f;
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98 row = move->torow + r;
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99 if (isidx(file) && isidx(row)) {
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100 if (gamestate->board[row][file] == move->piece) {
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101 if ((move->fromfile != POS_UNSPECIFIED
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102 && move->fromfile != file) ||
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103 (move->fromrow != POS_UNSPECIFIED
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104 && move->fromrow != row)) {
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105 return INVALID_POSITION;
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106 }
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107 move->fromfile = file;
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108 move->fromrow = row;
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109 return VALID_MOVE_SYNTAX;
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110 }
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111 }
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112 }
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113 }
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114
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115 return INVALID_POSITION;
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116 }

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