Mercurial > hg > terminal-chess / file comparison
comparison: src/chess/rules.c
src/chess/rules.c
- changeset 135
- 114e764fbae5
- parent 133
- c58ae152733e
- child 136
- 1a84ee6b4bf0
equal
deleted
inserted
replaced
| 134:ce2d285d2ccb | 135:114e764fbae5 |
|---|---|
| 537 candidates[candidatecount].piece = gamestate->board[r][f]; | 537 candidates[candidatecount].piece = gamestate->board[r][f]; |
| 538 candidates[candidatecount].fromrow = r; | 538 candidates[candidatecount].fromrow = r; |
| 539 candidates[candidatecount].fromfile = f; | 539 candidates[candidatecount].fromfile = f; |
| 540 candidates[candidatecount].torow = row; | 540 candidates[candidatecount].torow = row; |
| 541 candidates[candidatecount].tofile = file; | 541 candidates[candidatecount].tofile = file; |
| 542 if ((gamestate->board[r][f]&PIECE_MASK) == PAWN | |
| 543 && (row == 0 || row == 7)) { | |
| 544 /* the exact piece for promotion does not matter */ | |
| 545 candidates[candidatecount].promotion = color|QUEEN; | |
| 546 } | |
| 542 candidatecount++; | 547 candidatecount++; |
| 543 | 548 |
| 544 /* capturing move */ | 549 /* capturing move */ |
| 545 memcpy(&(candidates[candidatecount]), | 550 memcpy(&(candidates[candidatecount]), |
| 546 &(candidates[candidatecount-1]), sizeof(Move)); | 551 &(candidates[candidatecount-1]), sizeof(Move)); |
| 641 uint8_t piece = move->piece & PIECE_MASK; | 646 uint8_t piece = move->piece & PIECE_MASK; |
| 642 bool incheck = gamestate->movecount > 0 ? last_move(gamestate).check:false; | 647 bool incheck = gamestate->movecount > 0 ? last_move(gamestate).check:false; |
| 643 | 648 |
| 644 Move threats[16], *threat = NULL; | 649 Move threats[16], *threat = NULL; |
| 645 uint8_t threatcount; | 650 uint8_t threatcount; |
| 646 | 651 |
| 647 if (get_threats(gamestate, move->torow, move->tofile, color, | 652 if (get_threats(gamestate, move->torow, move->tofile, color, |
| 648 threats, &threatcount)) { | 653 threats, &threatcount)) { |
| 649 | 654 |
| 650 int reason = INVALID_POSITION; | 655 int reason = INVALID_POSITION; |
| 651 | 656 |
| 652 /* find threats for the specified position */ | 657 /* find threats for the specified position */ |
| 653 for (uint8_t i = 0 ; i < threatcount ; i++) { | 658 for (uint8_t i = 0 ; i < threatcount ; i++) { |
| 654 if ((threats[i].piece & PIECE_MASK) == piece | 659 if (threats[i].piece == move->piece && |
| 655 && (threats[i].piece & COLOR_MASK) == color && | |
| 656 (move->fromrow == POS_UNSPECIFIED || | 660 (move->fromrow == POS_UNSPECIFIED || |
| 657 move->fromrow == threats[i].fromrow) && | 661 move->fromrow == threats[i].fromrow) && |
| 658 (move->fromfile == POS_UNSPECIFIED || | 662 (move->fromfile == POS_UNSPECIFIED || |
| 659 move->fromfile == threats[i].fromfile)) { | 663 move->fromfile == threats[i].fromfile)) { |
| 660 | 664 |
| 661 if (threat) { | 665 if (threat) { |
| 662 return AMBIGUOUS_MOVE; | 666 return AMBIGUOUS_MOVE; |
| 663 } else { | 667 } else { |
| 664 /* found threat is no real threat */ | 668 /* found threat is no real threat */ |
| 669 // TODO: why didn't we call get_real_threats() ? | |
| 665 if (is_pinned(gamestate, &(threats[i]))) { | 670 if (is_pinned(gamestate, &(threats[i]))) { |
| 666 reason = incheck?KING_IN_CHECK: | 671 reason = incheck?KING_IN_CHECK: |
| 667 (piece==KING?KING_MOVES_INTO_CHECK:PIECE_PINNED); | 672 (piece==KING?KING_MOVES_INTO_CHECK:PIECE_PINNED); |
| 668 } else { | 673 } else { |
| 669 threat = &(threats[i]); | 674 threat = &(threats[i]); |
| 675 /* can't threaten specified position */ | 680 /* can't threaten specified position */ |
| 676 if (!threat) { | 681 if (!threat) { |
| 677 return reason; | 682 return reason; |
| 678 } | 683 } |
| 679 | 684 |
| 680 memcpy(move, threat, sizeof(Move)); | 685 /* found a threat, copy the source location */ |
| 686 move->fromrow = threat->fromrow; | |
| 687 move->fromfile = threat->fromfile; | |
| 681 return VALID_MOVE_SYNTAX; | 688 return VALID_MOVE_SYNTAX; |
| 682 } else { | 689 } else { |
| 683 return INVALID_POSITION; | 690 return INVALID_POSITION; |
| 684 } | 691 } |
| 685 } | 692 } |
