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1.1 root 1: /*
2: * Copyright (c) 1980 Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms are permitted
6: * provided that: (1) source distributions retain this entire copyright
7: * notice and comment, and (2) distributions including binaries display
8: * the following acknowledgement: ``This product includes software
9: * developed by the University of California, Berkeley and its contributors''
10: * in the documentation or other materials provided with the distribution
11: * and in all advertising materials mentioning features or use of this
12: * software. Neither the name of the University nor the names of its
13: * contributors may be used to endorse or promote products derived
14: * from this software without specific prior written permission.
15: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
16: * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
17: * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
18: */
19:
20: #ifndef lint
21: static char sccsid[] = "@(#)allow.c 5.4 (Berkeley) 6/1/90";
22: #endif /* not lint */
23:
24: #include "back.h"
25:
26: movallow () {
27:
28: register int i, m, iold;
29: int r;
30:
31: if (d0)
32: swap;
33: m = (D0 == D1? 4: 2);
34: for (i = 0; i < 4; i++)
35: p[i] = bar;
36: i = iold = 0;
37: while (i < m) {
38: if (*offptr == 15)
39: break;
40: h[i] = 0;
41: if (board[bar]) {
42: if (i == 1 || m == 4)
43: g[i] = bar+cturn*D1;
44: else
45: g[i] = bar+cturn*D0;
46: if (r = makmove(i)) {
47: if (d0 || m == 4)
48: break;
49: swap;
50: movback (i);
51: if (i > iold)
52: iold = i;
53: for (i = 0; i < 4; i++)
54: p[i] = bar;
55: i = 0;
56: } else
57: i++;
58: continue;
59: }
60: if ((p[i] += cturn) == home) {
61: if (i > iold)
62: iold = i;
63: if (m == 2 && i) {
64: movback(i);
65: p[i--] = bar;
66: if (p[i] != bar)
67: continue;
68: else
69: break;
70: }
71: if (d0 || m == 4)
72: break;
73: swap;
74: movback (i);
75: for (i = 0; i < 4; i++)
76: p[i] = bar;
77: i = 0;
78: continue;
79: }
80: if (i == 1 || m == 4)
81: g[i] = p[i]+cturn*D1;
82: else
83: g[i] = p[i]+cturn*D0;
84: if (g[i]*cturn > home) {
85: if (*offptr >= 0)
86: g[i] = home;
87: else
88: continue;
89: }
90: if (board[p[i]]*cturn > 0 && (r = makmove(i)) == 0)
91: i++;
92: }
93: movback (i);
94: return (iold > i? iold: i);
95: }
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