initial import of 386bsd-0.1 sources

1 files changed, 113 insertions, 0 deletions

diff --git a/backgammon/common_source/odds.c b/backgammon/common_source/odds.c
new file mode 100644
index 00000000..dc780497
--- /dev/null
+++ b/backgammon/common_source/odds.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 1980 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. 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.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)odds.c	5.4 (Berkeley) 6/1/90";
+#endif /* not lint */
+
+#include "back.h"
+
+odds (r1,r2,val)
+register int	r1;
+int		r2, val;
+{
+	register 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;
+		}
+	}
+}
+
+count ()  {
+	register int	i;
+	register int	j;
+	register int	total;
+
+	total = 0;
+	for (i = 0; i < 6; i++)
+		for (j = 0; j < 6; j++)
+			total += table[i][j];
+	return (total);
+}
+
+canhit (i,c)
+int	i, c;
+
+{
+	register int	j, k, b;
+	int		a, d, 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());
+}