Mercurial > hg > terminal-chess / file comparison
comparison: src/chess/pawn.c
src/chess/pawn.c
- changeset 169
- 9962f5d98764
- parent 163
- 2a6d83f4677e
- child 170
- bde99d803caf
equal
deleted
inserted
replaced
| 168:663676cfef6e | 169:9962f5d98764 |
|---|---|
| 75 } else { | 75 } else { |
| 76 return piece_at(gamestate, mdst(move)) || | 76 return piece_at(gamestate, mdst(move)) || |
| 77 gamestate->board[(move->fromrow+move->torow)/2][move->tofile]; | 77 gamestate->board[(move->fromrow+move->torow)/2][move->tofile]; |
| 78 } | 78 } |
| 79 } | 79 } |
| 80 | |
| 81 size_t pawn_moves(GameState *gamestate, Color c, Row r, File f, Move *moves) { | |
| 82 size_t count = 0; | |
| 83 int rowdelta = c == WHITE ? 1 : -1; | |
| 84 int promotionrow = c == WHITE ? 7 : 0; | |
| 85 int startrow = c == WHITE ? 1 : 6; | |
| 86 const int targets[4][3] = { | |
| 87 {r + rowdelta, f, 0}, | |
| 88 {r + rowdelta, f - 1, 1}, | |
| 89 {r + rowdelta, f + 1, 1}, | |
| 90 {r + rowdelta * 2, f, 0} | |
| 91 }; | |
| 92 | |
| 93 for (size_t i = 0 ; i < 4 ; i++) { | |
| 94 int row = targets[i][0]; | |
| 95 int file = targets[i][1]; | |
| 96 | |
| 97 if (i == 3 && r != startrow) { | |
| 98 continue; | |
| 99 } | |
| 100 | |
| 101 if (isidx(row) && isidx(file)) { | |
| 102 moves[count] = (Move){0}; | |
| 103 moves[count].piece = mkpiece(PAWN, c); | |
| 104 moves[count].fromrow = r; | |
| 105 moves[count].fromfile = f; | |
| 106 moves[count].torow = row; | |
| 107 moves[count].tofile = file; | |
| 108 moves[count].capture = targets[i][2]; | |
| 109 | |
| 110 if (row == promotionrow) { | |
| 111 moves[count].promotion = mkpiece(QUEEN, c); | |
| 112 } | |
| 113 | |
| 114 count++; | |
| 115 } | |
| 116 } | |
| 117 | |
| 118 return count; | |
| 119 } |
