Mercurial > hg > terminal-chess / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/chess/pawn.c	Mon Mar 31 11:16:32 2014 +0200
     1.3 @@ -0,0 +1,97 @@
     1.4 +/*
     1.5 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
     1.6 + *
     1.7 + * Copyright 2014 Mike Becker. All rights reserved.
     1.8 + *
     1.9 + * Redistribution and use in source and binary forms, with or without
    1.10 + * modification, are permitted provided that the following conditions are met:
    1.11 + *
    1.12 + *   1. Redistributions of source code must retain the above copyright
    1.13 + *      notice, this list of conditions and the following disclaimer.
    1.14 + *
    1.15 + *   2. Redistributions in binary form must reproduce the above copyright
    1.16 + *      notice, this list of conditions and the following disclaimer in the
    1.17 + *      documentation and/or other materials provided with the distribution.
    1.18 + *
    1.19 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    1.20 + * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    1.21 + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    1.22 + * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
    1.23 + * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    1.24 + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    1.25 + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    1.26 + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    1.27 + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    1.28 + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    1.29 + * POSSIBILITY OF SUCH DAMAGE.
    1.30 + *
    1.31 + */
    1.32 +
    1.33 +#include "pawn.h"
    1.34 +#include "rules.h"
    1.35 +
    1.36 +_Bool pawn_chkrules(Board board, Move *move) {
    1.37 +    int8_t d = ((move->piece & COLOR_MASK) == WHITE ? -1 : 1);
    1.38 +    
    1.39 +    if (move->torow == (d < 0 ? 7 : 0)) {
    1.40 +        if (move->promotion) {
    1.41 +            uint8_t promopiece = move->promotion & PIECE_MASK;
    1.42 +            if (!promopiece || promopiece == PAWN || promopiece == KING) {
    1.43 +                return 0;
    1.44 +            }
    1.45 +        } else {
    1.46 +            return 0;
    1.47 +        }
    1.48 +    } else {
    1.49 +        if (move->promotion) {
    1.50 +            return 0;
    1.51 +        }
    1.52 +    }
    1.53 +    
    1.54 +    if (move->capture) {
    1.55 +        if (move->fromrow == move->torow + d && (
    1.56 +            move->fromfile == move->tofile + 1 ||
    1.57 +            move->fromfile == move->tofile - 1)) {
    1.58 +
    1.59 +            return mdst(board,move)
    1.60 +                || (board[move->fromrow][move->tofile] & ENPASSANT_THREAT);
    1.61 +        } else {
    1.62 +            return 0;
    1.63 +        }
    1.64 +    } else {
    1.65 +        if (move->fromfile == move->tofile) {
    1.66 +            return (move->fromrow == move->torow + d) ||
    1.67 +                (move->fromrow == (d < 0 ? 1 : 6) && /* advanced first move */
    1.68 +                move->fromrow == move->torow + d*2);
    1.69 +        } else {
    1.70 +            return 0;
    1.71 +        }
    1.72 +    }
    1.73 +}
    1.74 +
    1.75 +_Bool pawn_isblocked(Board board, Move *move) {
    1.76 +    return mdst(board,move) && !move->capture;
    1.77 +}
    1.78 +
    1.79 +int pawn_getlocation(Board board, Move *move) {
    1.80 +    int8_t d = ((move->piece & COLOR_MASK) == WHITE ? -1 : 1);
    1.81 +    
    1.82 +    if (move->fromfile == POS_UNSPECIFIED) {
    1.83 +        move->fromfile = move->tofile;
    1.84 +    }
    1.85 +    move->fromrow = move->torow + d;
    1.86 +    if (move->fromrow > 6) {
    1.87 +        return INVALID_POSITION;
    1.88 +    } else {
    1.89 +        /* advanced first move */
    1.90 +        if (move->fromrow == (d < 0 ? 2 : 5) &&
    1.91 +            msrc(board,move) != move->piece) {
    1.92 +
    1.93 +            move->fromrow += d;
    1.94 +            if (move->fromrow > 6) {
    1.95 +                return INVALID_POSITION;
    1.96 +            }
    1.97 +        }
    1.98 +    }
    1.99 +    return VALID_MOVE_SYNTAX;
   1.100 +}