111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
/*
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* Copyright (c) 1980 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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/*static char sccsid[] = "from: @(#)allow.c 5.4 (Berkeley) 6/1/90";*/
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static char rcsid[] = "$Id: allow.c,v 1.2 1993/08/01 18:56:46 mycroft Exp $";
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#endif /* not lint */
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#include "back.h"
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movallow () {
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register int i, m, iold;
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int r;
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if (d0)
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swap;
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m = (D0 == D1? 4: 2);
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for (i = 0; i < 4; i++)
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p[i] = bar;
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i = iold = 0;
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while (i < m) {
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if (*offptr == 15)
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break;
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h[i] = 0;
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if (board[bar]) {
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if (i == 1 || m == 4)
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g[i] = bar+cturn*D1;
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else
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g[i] = bar+cturn*D0;
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if (r = makmove(i)) {
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if (d0 || m == 4)
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break;
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swap;
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movback (i);
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if (i > iold)
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iold = i;
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for (i = 0; i < 4; i++)
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p[i] = bar;
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i = 0;
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} else
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i++;
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continue;
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}
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if ((p[i] += cturn) == home) {
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if (i > iold)
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iold = i;
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if (m == 2 && i) {
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movback(i);
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p[i--] = bar;
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if (p[i] != bar)
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continue;
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else
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break;
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}
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if (d0 || m == 4)
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break;
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swap;
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movback (i);
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for (i = 0; i < 4; i++)
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p[i] = bar;
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i = 0;
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continue;
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}
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if (i == 1 || m == 4)
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g[i] = p[i]+cturn*D1;
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else
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g[i] = p[i]+cturn*D0;
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if (g[i]*cturn > home) {
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if (*offptr >= 0)
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g[i] = home;
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else
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continue;
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}
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if (board[p[i]]*cturn > 0 && (r = makmove(i)) == 0)
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i++;
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}
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movback (i);
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return (iold > i? iold: i);
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}
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