initial import of 386bsd-0.1 sources

1 files changed, 109 insertions, 0 deletions

diff --git a/backgammon/common_source/allow.c b/backgammon/common_source/allow.c
new file mode 100644
index 00000000..2a7c9e0d
--- /dev/null
+++ b/backgammon/common_source/allow.c
@@ -0,0 +1,109 @@
+/*
+ * 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[] = "@(#)allow.c	5.4 (Berkeley) 6/1/90";
+#endif /* not lint */
+
+#include "back.h"
+
+movallow ()  {
+
+	register int	i, m, iold;
+	int		r;
+
+	if (d0)
+		swap;
+	m = (D0 == D1? 4: 2);
+	for (i = 0; i < 4; i++)
+		p[i] = bar;
+	i = iold = 0;
+	while (i < m)  {
+		if (*offptr == 15)
+			break;
+		h[i] = 0;
+		if (board[bar])  {
+			if (i == 1 || m == 4)
+				g[i] = bar+cturn*D1;
+			else
+				g[i] = bar+cturn*D0;
+			if (r = makmove(i))  {
+				if (d0 || m == 4)
+					break;
+				swap;
+				movback (i);
+				if (i > iold)
+					iold = i;
+				for (i = 0; i < 4; i++)
+					p[i] = bar;
+				i = 0;
+			} else
+				i++;
+			continue;
+		}
+		if ((p[i] += cturn) == home)  {
+			if (i > iold)
+				iold = i;
+			if (m == 2 && i)  {
+				movback(i);
+				p[i--] = bar;
+				if (p[i] != bar)
+					continue;
+				else
+					break;
+			}
+			if (d0 || m == 4)
+				break;
+			swap;
+			movback (i);
+			for (i = 0; i < 4; i++)
+				p[i] = bar;
+			i = 0;
+			continue;
+		}
+		if (i == 1 || m == 4)
+			g[i] = p[i]+cturn*D1;
+		else
+			g[i] = p[i]+cturn*D0;
+		if (g[i]*cturn > home)  {
+			if (*offptr >= 0)
+				g[i] = home;
+			else
+				continue;
+		}
+		if (board[p[i]]*cturn > 0 && (r = makmove(i)) == 0)
+			i++;
+	}
+	movback (i);
+	return (iold > i? iold: i);
+}