src/chess/king.c

Mon, 21 Mar 2016 20:35:58 +0100

author
Mike Becker <universe@uap-core.de>
date
Mon, 21 Mar 2016 20:35:58 +0100
changeset 56
11b57a15d11a
parent 55
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child 64
4eda5df55f86
permissions
-rw-r--r--

fixed hypthetical bug, where the client address is not correctly retrieved by accept()

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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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54ea19938d57 updated copyright and version info
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4 * Copyright 2016 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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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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71 uint8_t opponent_color = opponent_color(move->piece&COLOR_MASK);
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72
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73 // being in check does not "block" the king, so don't test it here
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74 _Bool blocked = 0;
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76 // just test, if castling move is blocked
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77 if (abs(move->tofile - move->fromfile) == 2) {
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78 if (move->tofile == fileidx('c')) {
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79 blocked |= gamestate->board[move->torow][fileidx('b')];
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80 }
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81 uint8_t midfile = (move->tofile+move->fromfile)/2;
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82 blocked |= gamestate->lastmove->move.check ||
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83 gamestate->board[move->torow][midfile] ||
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84 is_covered(gamestate, move->torow, midfile, opponent_color);
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85 }
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86
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87 return blocked;
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88 }

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