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allow.c revision 1.4 
      1 /*	$NetBSD: allow.c,v 1.4 1997/10/10 08:59:41 lukem Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1980, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "@(#)allow.c	8.1 (Berkeley) 5/31/93";
     40 #else
     41 __RCSID("$NetBSD: allow.c,v 1.4 1997/10/10 08:59:41 lukem Exp $");
     42 #endif
     43 #endif /* not lint */
     44 
     45 #include "back.h"
     46 
     47 int
     48 movallow()
     49 {
     50 	int     i, m, iold;
     51 	int     r;
     52 
     53 	if (d0)
     54 		swap;
     55 	m = (D0 == D1 ? 4 : 2);
     56 	for (i = 0; i < 4; i++)
     57 		p[i] = bar;
     58 	i = iold = 0;
     59 	while (i < m) {
     60 		if (*offptr == 15)
     61 			break;
     62 		h[i] = 0;
     63 		if (board[bar]) {
     64 			if (i == 1 || m == 4)
     65 				g[i] = bar + cturn * D1;
     66 			else
     67 				g[i] = bar + cturn * D0;
     68 			if ((r = makmove(i)) != 0) {
     69 				if (d0 || m == 4)
     70 					break;
     71 				swap;
     72 				movback(i);
     73 				if (i > iold)
     74 					iold = i;
     75 				for (i = 0; i < 4; i++)
     76 					p[i] = bar;
     77 				i = 0;
     78 			} else
     79 				i++;
     80 			continue;
     81 		}
     82 		if ((p[i] += cturn) == home) {
     83 			if (i > iold)
     84 				iold = i;
     85 			if (m == 2 && i) {
     86 				movback(i);
     87 				p[i--] = bar;
     88 				if (p[i] != bar)
     89 					continue;
     90 				else
     91 					break;
     92 			}
     93 			if (d0 || m == 4)
     94 				break;
     95 			swap;
     96 			movback(i);
     97 			for (i = 0; i < 4; i++)
     98 				p[i] = bar;
     99 			i = 0;
    100 			continue;
    101 		}
    102 		if (i == 1 || m == 4)
    103 			g[i] = p[i] + cturn * D1;
    104 		else
    105 			g[i] = p[i] + cturn * D0;
    106 		if (g[i] * cturn > home) {
    107 			if (*offptr >= 0)
    108 				g[i] = home;
    109 			else
    110 				continue;
    111 		}
    112 		if (board[p[i]] * cturn > 0 && (r = makmove(i)) == 0)
    113 			i++;
    114 	}
    115 	movback(i);
    116 	return (iold > i ? iold : i);
    117 }
    118