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

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

src/chess/bishop.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 21: 2e5846019b4f
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 "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;
     }
 }

Mercurial > hg > terminal-chess / annotate

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

src/chess/bishop.c