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odds.c revision 1.3 
      1 /*	$NetBSD: odds.c,v 1.3 1995/03/21 15:05:47 cgd 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[] = "$NetBSD: odds.c,v 1.3 1995/03/21 15:05:47 cgd Exp $";
     41 #endif
     42 #endif /* not lint */
     43 
     44 #include "back.h"
     45 
     46 odds (r1,r2,val)
     47 register int	r1;
     48 int		r2, val;
     49 {
     50 	register 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 count ()  {
     72 	register int	i;
     73 	register int	j;
     74 	register int	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 canhit (i,c)
     85 int	i, c;
     86 
     87 {
     88 	register int	j, k, b;
     89 	int		a, d, diff, place, addon, menstuck;
     90 
     91 	if (c == 0)
     92 		odds (0,0,0);
     93 	if (board[i] > 0)  {
     94 		a = -1;
     95 		b = 25;
     96 	} else  {
     97 		a = 1;
     98 		b = 0;
     99 	}
    100 	place = abs (25-b-i);
    101 	menstuck = abs (board[b]);
    102 	for (j = b; j != i; j += a)  {
    103 		if (board[j]*a > 0)  {
    104 			diff = abs(j-i);
    105 			addon = place+((board[j]*a > 2 || j == b)? 5: 0);
    106 			if ((j == b && menstuck == 1) &&
    107 			    (j != b && menstuck == 0))
    108 				for (k = 1; k < diff; k++)
    109 					if (k < 7 && diff-k < 7 &&
    110 					    (board[i+a*k]*a >= 0 ||
    111 					    board[i+a*(diff-k)] >= 0))
    112 						odds (k,diff-k,addon);
    113 			if ((j == b || menstuck < 2) && diff < 7)
    114 				odds (diff,0,addon);
    115 		}
    116 		if (j == b && menstuck > 1)
    117 			break;
    118 	}
    119 	return (count());
    120 }
    121