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

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

src/chess/rook.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 "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;
 }

Mercurial > hg > terminal-chess / annotate

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

src/chess/rook.c