tuxillo's projects / dragonfly.git / blame
| Commit | Line | Data |
|---|---|---|
| 6693db17 | 1 | /*- |
| 984263bc MD |
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. | |
| 6693db17 | 13 | * 3. Neither the name of the University nor the names of its contributors |
| 984263bc MD |
14 | * may be used to endorse or promote products derived from this software |
| 15 | * without specific prior written permission. | |
| 16 | * | |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 27 | * SUCH DAMAGE. | |
| 1de703da MD |
28 | * |
| 29 | * @(#)allow.c 8.1 (Berkeley) 5/31/93 | |
| 30 | * $FreeBSD: src/games/backgammon/common_source/allow.c,v 1.4 1999/11/30 03:48:24 billf Exp $ | |
| 120e5d0e | 31 | * $DragonFly: src/games/backgammon/common_source/allow.c,v 1.3 2006/08/08 16:36:11 pavalos Exp $ |
| 984263bc MD |
32 | */ |
| 33 | ||
| 984263bc MD |
34 | #include "back.h" |
| 35 | ||
| 120e5d0e PA |
36 | int |
| 37 | movallow(void) | |
| 38 | { | |
| 6693db17 SW |
39 | int i, m, iold; |
| 40 | int r; | |
| 984263bc MD |
41 | |
| 42 | if (d0) | |
| 43 | swap; | |
| 6693db17 | 44 | m = (D0 == D1 ? 4 : 2); |
| 984263bc MD |
45 | for (i = 0; i < 4; i++) |
| 46 | p[i] = bar; | |
| 47 | i = iold = 0; | |
| 6693db17 | 48 | while (i < m) { |
| 984263bc MD |
49 | if (*offptr == 15) |
| 50 | break; | |
| 51 | h[i] = 0; | |
| 6693db17 | 52 | if (board[bar]) { |
| 984263bc | 53 | if (i == 1 || m == 4) |
| 6693db17 | 54 | g[i] = bar + cturn * D1; |
| 984263bc | 55 | else |
| 6693db17 SW |
56 | g[i] = bar + cturn * D0; |
| 57 | if ((r = makmove(i)) != 0) { | |
| 984263bc MD |
58 | if (d0 || m == 4) |
| 59 | break; | |
| 60 | swap; | |
| 6693db17 | 61 | movback(i); |
| 984263bc MD |
62 | if (i > iold) |
| 63 | iold = i; | |
| 64 | for (i = 0; i < 4; i++) | |
| 65 | p[i] = bar; | |
| 66 | i = 0; | |
| 67 | } else | |
| 68 | i++; | |
| 69 | continue; | |
| 70 | } | |
| 6693db17 | 71 | if ((p[i] += cturn) == home) { |
| 984263bc MD |
72 | if (i > iold) |
| 73 | iold = i; | |
| 6693db17 | 74 | if (m == 2 && i) { |
| 984263bc MD |
75 | movback(i); |
| 76 | p[i--] = bar; | |
| 77 | if (p[i] != bar) | |
| 78 | continue; | |
| 79 | else | |
| 80 | break; | |
| 81 | } | |
| 82 | if (d0 || m == 4) | |
| 83 | break; | |
| 84 | swap; | |
| 6693db17 | 85 | movback(i); |
| 984263bc MD |
86 | for (i = 0; i < 4; i++) |
| 87 | p[i] = bar; | |
| 88 | i = 0; | |
| 89 | continue; | |
| 90 | } | |
| 91 | if (i == 1 || m == 4) | |
| 6693db17 | 92 | g[i] = p[i] + cturn * D1; |
| 984263bc | 93 | else |
| 6693db17 SW |
94 | g[i] = p[i] + cturn * D0; |
| 95 | if (g[i] * cturn > home) { | |
| 984263bc MD |
96 | if (*offptr >= 0) |
| 97 | g[i] = home; | |
| 98 | else | |
| 99 | continue; | |
| 100 | } | |
| 6693db17 | 101 | if (board[p[i]] * cturn > 0 && (r = makmove(i)) == 0) |
| 984263bc MD |
102 | i++; |
| 103 | } | |
| 6693db17 SW |
104 | movback(i); |
| 105 | return (iold > i ? iold : i); | |
| 984263bc | 106 | } |