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 "rules.h" #include "rook.h" _Bool rook_chkrules(Move *move) { return move->torow == move->fromrow || move->tofile == move->fromfile; } _Bool rook_isblocked(GameState *gamestate, Move *move) { if (move->torow == move->fromrow) { int d = move->tofile > move->fromfile ? 1 : -1; uint8_t f = move->fromfile; while (f != move->tofile-d) { f += d; if (gamestate->board[move->fromrow][f]) { return 1; } } } else { int d = move->torow > move->fromrow ? 1 : -1; uint8_t r = move->fromrow; while (r != move->torow - d) { r += d; if (gamestate->board[r][move->fromfile]) { return 1; } } } return 0; } static int rook_getloc_fixedrow(GameState *gamestate, Move *move) { uint8_t file = POS_UNSPECIFIED; for (uint8_t f = 0 ; f < 8 ; f++) { if (gamestate->board[move->fromrow][f] == move->piece) { if (file == POS_UNSPECIFIED) { file = f; } else { return AMBIGUOUS_MOVE; } } } if (file == POS_UNSPECIFIED) { return INVALID_POSITION; } else { move->fromfile = file; return VALID_MOVE_SYNTAX; } } static int rook_getloc_fixedfile(GameState *gamestate, Move *move) { uint8_t row = POS_UNSPECIFIED; for (uint8_t r = 0 ; r < 8 ; r++) { if (gamestate->board[r][move->fromfile] == move->piece) { if (row == POS_UNSPECIFIED) { row = r; } else { return AMBIGUOUS_MOVE; } } } if (row == POS_UNSPECIFIED) { return INVALID_POSITION; } else { move->fromrow = row; return VALID_MOVE_SYNTAX; } } int rook_getlocation(GameState *gamestate, Move *move) { if (move->fromfile != POS_UNSPECIFIED) { if (move->fromfile == move->tofile) { return rook_getloc_fixedfile(gamestate, move); } else { if (gamestate->board[move->torow][move->fromfile] == move->piece) { move->fromrow = move->torow; return VALID_MOVE_SYNTAX; } else { return INVALID_POSITION; } } } if (move->fromrow != POS_UNSPECIFIED) { if (move->fromrow == move->torow) { return rook_getloc_fixedrow(gamestate, move); } else { if (gamestate->board[move->fromrow][move->tofile] == move->piece) { move->fromfile = move->tofile; return VALID_MOVE_SYNTAX; } else { return INVALID_POSITION; } } } Move chkrowmove = *move, chkfilemove = *move; chkrowmove.fromrow = move->torow; int chkrow = rook_getloc_fixedrow(gamestate, &chkrowmove); chkfilemove.fromfile = move->tofile; int chkfile = rook_getloc_fixedfile(gamestate, &chkfilemove); if ((chkrow == VALID_MOVE_SYNTAX && chkfile == VALID_MOVE_SYNTAX) || chkrow == AMBIGUOUS_MOVE || chkfile == AMBIGUOUS_MOVE) { return AMBIGUOUS_MOVE; } if (chkrow == VALID_MOVE_SYNTAX) { *move = chkrowmove; return VALID_MOVE_SYNTAX; } if (chkfile == VALID_MOVE_SYNTAX) { *move = chkfilemove; return VALID_MOVE_SYNTAX; } return INVALID_POSITION; }