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. 32 * 33 * @(#)one.c 8.1 (Berkeley) 5/31/93 34 * $FreeBSD: src/games/backgammon/common_source/one.c,v 1.5 1999/11/30 03:48:27 billf Exp $ 35 * $DragonFly: src/games/backgammon/common_source/one.c,v 1.3 2006/08/08 16:36:11 pavalos Exp $ 36 */ 37 38 #include "back.h" 39 40 static int checkd(int); 41 static int last(void); 42 43 int 44 makmove(int i) 45 { 46 int n, d; 47 int max; 48 49 d = d0; 50 n = abs(g[i]-p[i]); 51 max = (*offptr < 0? 7: last()); 52 if (board[p[i]]*cturn <= 0) 53 return (checkd(d)+2); 54 if (g[i] != home && board[g[i]]*cturn < -1) 55 return (checkd(d)+3); 56 if (i || D0 == D1) { 57 if (n == max? D1 < n: D1 != n) 58 return (checkd(d)+1); 59 } else { 60 if (n == max? D0 < n && D1 < n: D0 != n && D1 != n) 61 return (checkd(d)+1); 62 if (n == max? D0 < n: D0 != n) { 63 if (d0) 64 return (checkd(d)+1); 65 swap; 66 } 67 } 68 if (g[i] == home && *offptr < 0) 69 return (checkd(d)+4); 70 h[i] = 0; 71 board[p[i]] -= cturn; 72 if (g[i] != home) { 73 if (board[g[i]] == -cturn) { 74 board[home] -= cturn; 75 board[g[i]] = 0; 76 h[i] = 1; 77 if (abs(bar-g[i]) < 7) { 78 (*inopp)--; 79 if (*offopp >= 0) 80 *offopp -= 15; 81 } 82 } 83 board[g[i]] += cturn; 84 if (abs(home-g[i]) < 7 && abs(home-p[i]) > 6) { 85 (*inptr)++; 86 if (*inptr+*offptr == 0) 87 *offptr += 15; 88 } 89 } else { 90 (*offptr)++; 91 (*inptr)--; 92 } 93 return (0); 94 } 95 96 void 97 moverr(int i) 98 { 99 int j; 100 101 if (tflag) 102 curmove (20,0); 103 else 104 writec ('\n'); 105 writel ("Error: "); 106 for (j = 0; j <= i; j++) { 107 wrint (p[j]); 108 writec ('-'); 109 wrint (g[j]); 110 if (j < i) 111 writec (','); 112 } 113 writel ("... "); 114 movback (i); 115 } 116 117 static int 118 checkd(int d) 119 { 120 if (d0 != d) 121 swap; 122 return (0); 123 } 124 125 static int 126 last(void) 127 { 128 int i; 129 130 for (i = home-6*cturn; i != home; i += cturn) 131 if (board[i]*cturn > 0) 132 return (abs(home-i)); 133 return(-1); 134 } 135 136 void 137 movback(int i) 138 { 139 int j; 140 141 for (j = i-1; j >= 0; j--) 142 backone(j); 143 } 144 145 void 146 backone(int i) 147 { 148 board[p[i]] += cturn; 149 if (g[i] != home) { 150 board[g[i]] -= cturn; 151 if (abs(g[i]-home) < 7 && abs(p[i]-home) > 6) { 152 (*inptr)--; 153 if (*inptr+*offptr < 15 && *offptr >= 0) 154 *offptr -= 15; 155 } 156 } else { 157 (*offptr)--; 158 (*inptr)++; 159 } 160 if (h[i]) { 161 board[home] += cturn; 162 board[g[i]] = -cturn; 163 if (abs(bar-g[i]) < 7) { 164 (*inopp)++; 165 if (*inopp+*offopp == 0) 166 *offopp += 15; 167 } 168 } 169 } 170