1 /* $NetBSD: odds.c,v 1.4 1997/10/10 08:59:46 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1980, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)odds.c 8.1 (Berkeley) 5/31/93"; 40 #else 41 __RCSID("$NetBSD: odds.c,v 1.4 1997/10/10 08:59:46 lukem Exp $"); 42 #endif 43 #endif /* not lint */ 44 45 #include "back.h" 46 47 void 48 odds(r1, r2, val) 49 int r1, r2, val; 50 { 51 int i, j; 52 53 if (r1 == 0) { 54 for (i = 0; i < 6; i++) 55 for (j = 0; j < 6; j++) 56 table[i][j] = 0; 57 return; 58 } else { 59 r1--; 60 if (r2-- == 0) { 61 for (i = 0; i < 6; i++) { 62 table[i][r1] += val; 63 table[r1][i] += val; 64 } 65 } else { 66 table[r2][r1] += val; 67 table[r1][r2] += val; 68 } 69 } 70 } 71 72 int 73 count() 74 { 75 int i; 76 int j; 77 int total; 78 79 total = 0; 80 for (i = 0; i < 6; i++) 81 for (j = 0; j < 6; j++) 82 total += table[i][j]; 83 return (total); 84 } 85 86 int 87 canhit(i, c) 88 int i, c; 89 { 90 int j, k, b; 91 int a, diff, place, addon, menstuck; 92 93 if (c == 0) 94 odds(0, 0, 0); 95 if (board[i] > 0) { 96 a = -1; 97 b = 25; 98 } else { 99 a = 1; 100 b = 0; 101 } 102 place = abs(25 - b - i); 103 menstuck = abs(board[b]); 104 for (j = b; j != i; j += a) { 105 if (board[j] * a > 0) { 106 diff = abs(j - i); 107 addon = place + ((board[j] * a > 2 || j == b) ? 5 : 0); 108 if ((j == b && menstuck == 1) && 109 (j != b && menstuck == 0)) 110 for (k = 1; k < diff; k++) 111 if (k < 7 && diff - k < 7 && 112 (board[i + a * k] * a >= 0 || 113 board[i + a * (diff - k)] >= 0)) 114 odds(k, diff - k, addon); 115 if ((j == b || menstuck < 2) && diff < 7) 116 odds(diff, 0, addon); 117 } 118 if (j == b && menstuck > 1) 119 break; 120 } 121 return (count()); 122 } 123