1 /* @(#)one.c 8.1 (Berkeley) 5/31/93 */
2 /* $NetBSD: one.c,v 1.9 2012/10/13 19:19:39 dholland Exp $ */
3
4 /*
5 * Copyright (c) 1980, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include "back.h"
34
35 static int checkd(struct move *, int);
36 static int last(void);
37
38 int
makmove(struct move * mm,int i)39 makmove(struct move *mm, int i)
40 {
41 int n, d;
42 int max;
43
44 d = mm->d0;
45 n = abs(mm->g[i] - mm->p[i]);
46 max = (*offptr < 0 ? 7 : last());
47 if (board[mm->p[i]] * cturn <= 0)
48 return (checkd(mm, d) + 2);
49 if (mm->g[i] != home && board[mm->g[i]] * cturn < -1)
50 return (checkd(mm, d) + 3);
51 if (i || mm->D0 == mm->D1) {
52 if (n == max ? mm->D1 < n : mm->D1 != n)
53 return (checkd(mm, d) + 1);
54 } else {
55 if (n == max ? mm->D0 < n && mm->D1 < n : mm->D0 != n && mm->D1 != n)
56 return (checkd(mm, d) + 1);
57 if (n == max ? mm->D0 < n : mm->D0 != n) {
58 if (mm->d0)
59 return (checkd(mm, d) + 1);
60 mswap(mm);
61 }
62 }
63 if (mm->g[i] == home && *offptr < 0)
64 return (checkd(mm, d) + 4);
65 mm->h[i] = 0;
66 board[mm->p[i]] -= cturn;
67 if (mm->g[i] != home) {
68 if (board[mm->g[i]] == -cturn) {
69 board[home] -= cturn;
70 board[mm->g[i]] = 0;
71 mm->h[i] = 1;
72 if (abs(bar - mm->g[i]) < 7) {
73 (*inopp)--;
74 if (*offopp >= 0)
75 *offopp -= 15;
76 }
77 }
78 board[mm->g[i]] += cturn;
79 if (abs(home - mm->g[i]) < 7 && abs(home - mm->p[i]) > 6) {
80 (*inptr)++;
81 if (*inptr + *offptr == 0)
82 *offptr += 15;
83 }
84 } else {
85 (*offptr)++;
86 (*inptr)--;
87 }
88 return (0);
89 }
90
91 void
moverr(struct move * mm,int i)92 moverr(struct move *mm, int i)
93 {
94 int j;
95
96 if (tflag)
97 curmove(20, 0);
98 else
99 writec('\n');
100 writel("Error: ");
101 for (j = 0; j <= i; j++) {
102 wrint(mm->p[j]);
103 writec('-');
104 wrint(mm->g[j]);
105 if (j < i)
106 writec(',');
107 }
108 writel("... ");
109 movback(mm, i);
110 }
111
112
113 static int
checkd(struct move * mm,int d)114 checkd(struct move *mm, int d)
115 {
116 if (mm->d0 != d)
117 mswap(mm);
118 return (0);
119 }
120
121 static int
last(void)122 last(void)
123 {
124 int i;
125
126 for (i = home - 6 * cturn; i != home; i += cturn)
127 if (board[i] * cturn > 0)
128 return (abs(home - i));
129 return (-1);
130 }
131
132 void
movback(struct move * mm,int i)133 movback(struct move *mm, int i)
134 {
135 int j;
136
137 for (j = i - 1; j >= 0; j--)
138 backone(mm, j);
139 }
140
141 void
backone(struct move * mm,int i)142 backone(struct move *mm, int i)
143 {
144 board[mm->p[i]] += cturn;
145 if (mm->g[i] != home) {
146 board[mm->g[i]] -= cturn;
147 if (abs(mm->g[i] - home) < 7 && abs(mm->p[i] - home) > 6) {
148 (*inptr)--;
149 if (*inptr + *offptr < 15 && *offptr >= 0)
150 *offptr -= 15;
151 }
152 } else {
153 (*offptr)--;
154 (*inptr)++;
155 }
156 if (mm->h[i]) {
157 board[home] += cturn;
158 board[mm->g[i]] = -cturn;
159 if (abs(bar - mm->g[i]) < 7) {
160 (*inopp)++;
161 if (*inopp + *offopp == 0)
162 *offopp += 15;
163 }
164 }
165 }
166