terminal-chess: src/chess/pawn.c@824c9522ce66 (annotated)

src/chess/pawn.c@824c9522ce66 (annotated)

src/chess/pawn.c

Mon, 31 Mar 2014 15:03:25 +0200

author: Mike Becker <universe@uap-core.de>
date: Mon, 31 Mar 2014 15:03:25 +0200
changeset 23: 824c9522ce66
parent 19: 6a26114297a1
child 47: d726e4b46c33
permissions: -rw-r--r--

introduced game state structure

 /*
  * 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 "pawn.h"
 #include "rules.h"
 _Bool pawn_chkrules(GameState *gamestate, Move *move) {
     int8_t d = ((move->piece & COLOR_MASK) == WHITE ? -1 : 1);
     if (move->torow == (d < 0 ? 7 : 0)) {
         if (move->promotion) {
             uint8_t promopiece = move->promotion & PIECE_MASK;
             if (!promopiece || promopiece == PAWN || promopiece == KING) {
                 return 0;
             }
         } else {
             return 0;
         }
     } else {
         if (move->promotion) {
             return 0;
         }
     }
     if (move->capture) {
         if (move->fromrow == move->torow + d && (
             move->fromfile == move->tofile + 1 ||
             move->fromfile == move->tofile - 1)) {
             return mdst(gamestate->board, move) ||
                 (gamestate->board[move->fromrow][move->tofile]
                 & ENPASSANT_THREAT);
         } else {
             return 0;
         }
     } else {
         if (move->fromfile == move->tofile) {
             return (move->fromrow == move->torow + d) ||
                 (move->fromrow == (d < 0 ? 1 : 6) && /* advanced first move */
                 move->fromrow == move->torow + d*2);
         } else {
             return 0;
         }
     }
 }
 _Bool pawn_isblocked(GameState *gamestate, Move *move) {
     return mdst(gamestate->board, move) && !move->capture;
 }
 int pawn_getlocation(GameState *gamestate, Move *move) {
     int8_t d = ((move->piece & COLOR_MASK) == WHITE ? -1 : 1);
     if (move->fromfile == POS_UNSPECIFIED) {
         move->fromfile = move->tofile;
     }
     move->fromrow = move->torow + d;
     if (move->fromrow > 6) {
         return INVALID_POSITION;
     } else {
         /* advanced first move */
         if (move->fromrow == (d < 0 ? 2 : 5) &&
             msrc(gamestate->board,move) != move->piece) {
             move->fromrow += d;
             if (move->fromrow > 6) {
                 return INVALID_POSITION;
             }
         }
     }
     return VALID_MOVE_SYNTAX;
 }

Mercurial > hg > terminal-chess / annotate

src/chess/pawn.c@824c9522ce66 (annotated)

src/chess/pawn.c