Thu, 03 Apr 2014 16:07:04 +0200
moved checkmate and stalemate flags to gamestate
/* * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. * * Copyright 2014 Mike Becker. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * */ #include "bishop.h" #include "rules.h" #include <stdlib.h> _Bool bishop_chkrules(Move* move) { return abs(move->torow-move->fromrow) == abs(move->tofile-move->fromfile); } _Bool bishop_isblocked(GameState *gamestate, Move *move) { int dy = move->torow > move->fromrow ? 1 : -1; int dx = move->tofile > move->fromfile ? 1 : -1; uint8_t y = move->fromrow; uint8_t x = move->fromfile; while (x != move->tofile-dx && y != move->torow-dy) { x += dx; y += dy; if (gamestate->board[y][x]) { return 1; } } return 0; } static int bishop_getloc_fixedfile(GameState *gamestate, Move *move) { uint8_t d = abs(move->fromfile - move->tofile); if (gamestate->board[move->torow - d][move->fromfile] == move->piece) { move->fromrow = move->torow - d; } if (gamestate->board[move->torow + d][move->fromfile] == move->piece) { if (move->fromrow == POS_UNSPECIFIED) { move->fromrow = move->torow + d; } else { return AMBIGUOUS_MOVE; /* rare situation after promotion */ } } return move->fromrow == POS_UNSPECIFIED ? INVALID_POSITION : VALID_MOVE_SYNTAX; } static int bishop_getloc_fixedrow(GameState *gamestate, Move *move) { uint8_t d = abs(move->fromrow - move->torow); if (gamestate->board[move->fromrow][move->tofile - d] == move->piece) { move->fromfile = move->tofile - d; } if (gamestate->board[move->fromrow][move->tofile + d] == move->piece) { if (move->fromfile == POS_UNSPECIFIED) { move->fromfile = move->tofile + d; } else { return AMBIGUOUS_MOVE; /* rare situation after promotion */ } } return move->fromfile == POS_UNSPECIFIED ? INVALID_POSITION : VALID_MOVE_SYNTAX; } int bishop_getlocation(GameState *gamestate, Move *move) { if (move->fromfile != POS_UNSPECIFIED) { return bishop_getloc_fixedfile(gamestate, move); } if (move->fromrow != POS_UNSPECIFIED) { return bishop_getloc_fixedrow(gamestate, move); } _Bool amb = 0; for (int d = -7 ; d < 8 ; d++) { uint8_t row = move->torow + d; if (isidx(row)) { uint8_t file = move->tofile + d; if (isidx(file) && gamestate->board[row][file] == move->piece) { if (amb) { return AMBIGUOUS_MOVE; } amb = 1; move->fromrow = row; move->fromfile = file; } file = move->tofile - d; if (isidx(file) && gamestate->board[row][file] == move->piece) { if (amb) { return AMBIGUOUS_MOVE; } amb = 1; move->fromrow = row; move->fromfile = file; } } } if (move->fromrow == POS_UNSPECIFIED || move->fromfile == POS_UNSPECIFIED) { return INVALID_POSITION; } else { return VALID_MOVE_SYNTAX; } }