From 013ac7742311556022304e8b30ca170d48b3a016 Mon Sep 17 00:00:00 2001
From: "B. Watson" <yalhcru@gmail.com>
Date: Thu, 7 May 2015 16:32:32 -0400
Subject: initial commit

---
 ching/castching/Makefile    |   7 +++
 ching/castching/castching.c | 135 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 142 insertions(+)
 create mode 100644 ching/castching/Makefile
 create mode 100644 ching/castching/castching.c

(limited to 'ching/castching')

diff --git a/ching/castching/Makefile b/ching/castching/Makefile
new file mode 100644
index 0000000..dd84fc9
--- /dev/null
+++ b/ching/castching/Makefile
@@ -0,0 +1,7 @@
+#	$NetBSD: Makefile,v 1.1 2005/06/30 13:30:33 perry Exp $
+
+PROG=	castching
+NOMAN=	# defined
+BINDIR=	/usr/libexec/ching
+
+.include <bsd.prog.mk>
diff --git a/ching/castching/castching.c b/ching/castching/castching.c
new file mode 100644
index 0000000..351037a
--- /dev/null
+++ b/ching/castching/castching.c
@@ -0,0 +1,135 @@
+/*	$NetBSD: castching.c,v 1.3 2009/08/12 05:40:03 dholland Exp $	*/
+
+/*
+ * Copyright (c) 1988, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Guy Harris.
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+#ifndef lint
+__COPYRIGHT("@(#) Copyright (c) 1988, 1993\
+ The Regents of the University of California.  All rights reserved.");
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)ching.cno.c	8.1 (Berkeley) 5/31/93";
+#else
+__RCSID("$NetBSD: castching.c,v 1.3 2009/08/12 05:40:03 dholland Exp $");
+#endif
+#endif /* not lint */
+
+/*
+ * castching - Read a question, cast a change, and output the line
+ * values to the standard output for processing by "printching".
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <unistd.h>
+#include "ching.h"
+
+static time_t now;		/* current time */
+
+static unsigned seed;		/* seed for random number generator */
+
+static int getquest(void);
+static unsigned getrand(void);
+static unsigned getrnum(void);
+static char *change(void);
+
+static char string[6+1];	/* where the actual change string is put */
+
+static int table[2][2][2] = {
+	{ { OYIN,  YYANG,}, { YYANG, YYIN,} },
+	{ { YYANG, YYIN,},  { YYIN,  OYANG,} },
+};
+
+/*ARGSUSED*/
+int
+main(int argc, char **argv)
+{
+	time(&now);
+	/* randomize */
+	seed = (int)now + getquest() + getgid() + getuid() + getpid();
+	printf("%s\n", change());
+	exit(0);
+}
+
+/*
+ * Hash the question by adding all the characters together.
+ */
+static int
+getquest(void)
+{
+	int result;
+	int c;
+
+	result = 0;
+	while ((c = getchar()) != EOF)
+		result += c;
+	return(result);
+}
+
+/*
+ * Get a set of six lines making up a change.
+ */
+static char *
+change(void)
+{
+	int i;
+
+	for (i = 0; i < 6; i++)
+		string[i] = table[getrnum()&01][getrnum()&01][getrnum()&01] + '0';
+	string[i] = '\0';
+	return(string);
+}
+
+/*
+ * Get a number more random than what getrand() gives.
+ */
+static unsigned
+getrnum(void)
+{
+	return((getrand())>>(getrand()%17));
+}
+
+/*
+ * Get a random number.
+ */
+static unsigned
+getrand(void)
+{
+	return(seed = (seed*13077) + 6925);
+}
-- 
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