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/* $NetBSD: odds.c,v 1.6 2005/07/01 01:12:39 jmc Exp $ */
/*
* Copyright (c) 1980, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)odds.c 8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: odds.c,v 1.6 2005/07/01 01:12:39 jmc Exp $");
#endif
#endif /* not lint */
#include "back.h"
void
odds(int r1, int r2, int val)
{
int i, j;
if (r1 == 0) {
for (i = 0; i < 6; i++)
for (j = 0; j < 6; j++)
table[i][j] = 0;
return;
} else {
r1--;
if (r2-- == 0) {
for (i = 0; i < 6; i++) {
table[i][r1] += val;
table[r1][i] += val;
}
} else {
table[r2][r1] += val;
table[r1][r2] += val;
}
}
}
int
count(void)
{
int i;
int j;
int total;
total = 0;
for (i = 0; i < 6; i++)
for (j = 0; j < 6; j++)
total += table[i][j];
return (total);
}
int
canhit(int i, int c)
{
int j, k, b;
int a, diff, place, addon, menstuck;
if (c == 0)
odds(0, 0, 0);
if (board[i] > 0) {
a = -1;
b = 25;
} else {
a = 1;
b = 0;
}
place = abs(25 - b - i);
menstuck = abs(board[b]);
for (j = b; j != i; j += a) {
if (board[j] * a > 0) {
diff = abs(j - i);
addon = place + ((board[j] * a > 2 || j == b) ? 5 : 0);
if ((j == b && menstuck == 1) &&
(j != b && menstuck == 0))
for (k = 1; k < diff; k++)
if (k < 7 && diff - k < 7 &&
(board[i + a * k] * a >= 0 ||
board[i + a * (diff - k)] >= 0))
odds(k, diff - k, addon);
if ((j == b || menstuck < 2) && diff < 7)
odds(diff, 0, addon);
}
if (j == b && menstuck > 1)
break;
}
return (count());
}
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