terminal-chess: src/chess/king.c@3ab0c2e1a4e2 (annotated)

src/chess/king.c@3ab0c2e1a4e2 (annotated)

src/chess/king.c

Tue, 01 Apr 2014 12:30:25 +0200

author: Mike Becker <universe@uap-core.de>
date: Tue, 01 Apr 2014 12:30:25 +0200
changeset 25: 3ab0c2e1a4e2
parent 23: 824c9522ce66
child 47: d726e4b46c33
permissions: -rw-r--r--

implemented king

 /*
  * 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 "king.h"
 #include <stdlib.h>
 static _Bool king_castling_chkmoved(GameState *gamestate,
     uint8_t row, uint8_t file) {
     MoveList *ml = gamestate->movelist;
     while (ml) {
         if (ml->move.fromfile == file && ml->move.fromrow == row) {
             return 1;
         }
         ml = ml->next;
     }
     return 0;
 }
 _Bool king_chkrules(GameState *gamestate, Move* move) {
     if (abs(move->torow - move->fromrow) <= 1 &&
         abs(move->tofile - move->fromfile) <= 1) {
         return 1;
     } else {
         /* castling */
         if (move->fromrow == move->torow &&
             move->fromrow == ((move->piece&COLOR_MASK) == WHITE ? 0 : 7) &&
             move->fromfile == fileidx('e') &&
             (move->tofile == fileidx('c') || move->tofile == fileidx('g'))) {
             return !king_castling_chkmoved(gamestate,
                 move->fromrow, move->fromfile) &&
                 !king_castling_chkmoved(gamestate, move->fromrow,
                 move->tofile == fileidx('c') ? 0 : 7);
         } else {
             return 0;
         }
     }
 }
 _Bool king_isblocked(GameState *gamestate, Move *move) {
     uint8_t opponent_color = opponent_color(move->piece&COLOR_MASK);
     _Bool blocked = is_covered(gamestate, move->torow, move->tofile,
         opponent_color);
     if (abs(move->tofile - move->fromfile) == 2) {
         if (move->tofile == fileidx('c')) {
             blocked |= gamestate->board[move->torow][fileidx('b')];
         }
         uint8_t midfile = (move->tofile+move->fromfile)/2;
         blocked |= gamestate->lastmove->move.check ||
             gamestate->board[move->torow][midfile] ||
             is_covered(gamestate, move->torow, midfile, opponent_color);
     }
     return blocked;
 }
 int king_getlocation(GameState *gamestate, Move *move) {
     uint8_t file, row;
     for (int f = -1 ; f <= 1 ; f++) {
         for (int r = -1 ; r <= 1 ; r++) {
             if (f == 0 && r == 0) {
                 continue;
             }
             file = move->tofile + f;
             row = move->torow + r;
             if (isidx(file) && isidx(row)) {
                 if (gamestate->board[row][file] == move->piece) {
                     if ((move->fromfile != POS_UNSPECIFIED
                         && move->fromfile != file) ||
                         (move->fromrow != POS_UNSPECIFIED
                         && move->fromrow != row)) {
                         return INVALID_POSITION;
                     }
                     move->fromfile = file;
                     move->fromrow = row;
                     return VALID_MOVE_SYNTAX;
                 }
             }
         }
     }
     return INVALID_POSITION;
 }

Mercurial > hg > terminal-chess / annotate

src/chess/king.c@3ab0c2e1a4e2 (annotated)

src/chess/king.c