1 /* $OpenBSD: odds.c,v 1.2 1998/03/19 11:13:22 pjanzen 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 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)odds.c 8.1 (Berkeley) 5/31/93"; 39 #else 40 static char rcsid[] = "$OpenBSD: odds.c,v 1.2 1998/03/19 11:13:22 pjanzen Exp $"; 41 #endif 42 #endif /* not lint */ 43 44 #include "back.h" 45 46 void 47 odds(r1, r2, val) 48 int r1, r2, val; 49 { 50 int i, j; 51 52 if (r1 == 0) { 53 for (i = 0; i < 6; i++) 54 for (j = 0; j < 6; j++) 55 table[i][j] = 0; 56 return; 57 } else { 58 r1--; 59 if (r2-- == 0) { 60 for (i = 0; i < 6; i++) { 61 table[i][r1] += val; 62 table[r1][i] += val; 63 } 64 } else { 65 table[r2][r1] += val; 66 table[r1][r2] += val; 67 } 68 } 69 } 70 71 int 72 count() 73 { 74 int i, j, total; 75 76 total = 0; 77 for (i = 0; i < 6; i++) 78 for (j = 0; j < 6; j++) 79 total += table[i][j]; 80 return(total); 81 } 82 83 int 84 canhit(i, c) 85 int i, c; 86 { 87 int j, k, b; 88 int a, diff, place, addon, menstuck; 89 90 if (c == 0) 91 odds(0, 0, 0); 92 if (board[i] > 0) { 93 a = -1; 94 b = 25; 95 } else { 96 a = 1; 97 b = 0; 98 } 99 place = abs(25 - b - i); 100 menstuck = abs(board[b]); 101 for (j = b; j != i; j += a) { 102 if (board[j] * a > 0) { 103 diff = abs(j - i); 104 addon = place + ((board[j] * a > 2 || j == b) ? 5 : 0); 105 if ((j == b && menstuck == 1) && 106 (j != b && menstuck == 0)) 107 for (k = 1; k < diff; k++) 108 if (k < 7 && diff - k < 7 && 109 (board[i + a * k] * a >= 0 || 110 board[i + a * (diff - k)] >= 0)) 111 odds(k, diff - k, addon); 112 if ((j == b || menstuck < 2) && diff < 7) 113 odds(diff, 0, addon); 114 } 115 if (j == b && menstuck > 1) 116 break; 117 } 118 return(count()); 119 } 120