Wed, 26 Mar 2014 14:53:15 +0100
fixed crucial bug where both players could move at the same time + added pawn rules (TODO: en passant)
1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 *
4 * Copyright 2014 Mike Becker. All rights reserved.
5 *
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7 * modification, are permitted provided that the following conditions are met:
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9 * 1. Redistributions of source code must retain the above copyright
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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28 */
30 #include "pawn.h"
32 _Bool pawn_chkrules(Board board, Move *move) {
33 int8_t d = ((move->piece & COLOR_MASK) == WHITE ? -1 : 1);
34 if (move->capture) {
35 if (move->fromrow == move->torow + d && (
36 move->fromfile == move->tofile + 1 ||
37 move->fromfile == move->tofile - 1)) {
38 // TODO: en passant
39 return mdst(board,move) != 0; /* color has been checked */
40 } else {
41 return FALSE;
42 }
43 } else {
44 if (move->fromfile == move->tofile) {
45 return (move->fromrow == move->torow + d) ||
46 (move->fromrow == (d < 0 ? 1 : 6) && /* advanced first move */
47 move->fromrow == move->torow + d*2);
48 } else {
49 return FALSE;
50 }
51 }
52 }
54 _Bool pawn_isblocked(Board board, Move *move) {
55 return mdst(board,move) && !move->capture;
56 }
58 _Bool pawn_getlocation(Board board, Move *move) {
59 int8_t d = ((move->piece & COLOR_MASK) == WHITE ? -1 : 1);
61 if (move->fromfile == POS_UNSPECIFIED) {
62 move->fromfile = move->tofile;
63 }
64 move->fromrow = move->torow + d;
65 if (move->fromrow > 6) {
66 return FALSE;
67 } else {
68 /* advanced first move */
69 if (move->fromrow == (d < 0 ? 2 : 5) &&
70 msrc(board,move) != move->piece) {
72 move->fromrow += d;
73 if (move->fromrow > 6) {
74 return FALSE;
75 }
76 }
77 }
78 return TRUE;
79 }