Add the DragonFly cvs id and perform general cleanups on cvs/rcs/sccs ids. Most
[dragonfly.git] / games / backgammon / common_source / allow.c
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1/*
2 * Copyright (c) 1980, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
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32 *
33 * @(#)allow.c 8.1 (Berkeley) 5/31/93
34 * $FreeBSD: src/games/backgammon/common_source/allow.c,v 1.4 1999/11/30 03:48:24 billf Exp $
35 * $DragonFly: src/games/backgammon/common_source/allow.c,v 1.2 2003/06/17 04:25:22 dillon Exp $
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36 */
37
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38#include "back.h"
39
40movallow () {
41
42 int i, m, iold;
43 int r;
44
45 if (d0)
46 swap;
47 m = (D0 == D1? 4: 2);
48 for (i = 0; i < 4; i++)
49 p[i] = bar;
50 i = iold = 0;
51 while (i < m) {
52 if (*offptr == 15)
53 break;
54 h[i] = 0;
55 if (board[bar]) {
56 if (i == 1 || m == 4)
57 g[i] = bar+cturn*D1;
58 else
59 g[i] = bar+cturn*D0;
60 if (r = makmove(i)) {
61 if (d0 || m == 4)
62 break;
63 swap;
64 movback (i);
65 if (i > iold)
66 iold = i;
67 for (i = 0; i < 4; i++)
68 p[i] = bar;
69 i = 0;
70 } else
71 i++;
72 continue;
73 }
74 if ((p[i] += cturn) == home) {
75 if (i > iold)
76 iold = i;
77 if (m == 2 && i) {
78 movback(i);
79 p[i--] = bar;
80 if (p[i] != bar)
81 continue;
82 else
83 break;
84 }
85 if (d0 || m == 4)
86 break;
87 swap;
88 movback (i);
89 for (i = 0; i < 4; i++)
90 p[i] = bar;
91 i = 0;
92 continue;
93 }
94 if (i == 1 || m == 4)
95 g[i] = p[i]+cturn*D1;
96 else
97 g[i] = p[i]+cturn*D0;
98 if (g[i]*cturn > home) {
99 if (*offptr >= 0)
100 g[i] = home;
101 else
102 continue;
103 }
104 if (board[p[i]]*cturn > 0 && (r = makmove(i)) == 0)
105 i++;
106 }
107 movback (i);
108 return (iold > i? iold: i);
109}