svn commit: r278280 - head/tools/tools/qrndtest

[John-Mark Gurney]

Author: jmg
Date: Thu Feb  5 20:23:36 2015
New Revision: 278280
URL: https://svnweb.freebsd.org/changeset/base/278280

Log:
  add a quick testing program I wrote for adrian...

Added:
  head/tools/tools/qrndtest/
  head/tools/tools/qrndtest/Makefile   (contents, props changed)
  head/tools/tools/qrndtest/README   (contents, props changed)
  head/tools/tools/qrndtest/r.c   (contents, props changed)

Added: head/tools/tools/qrndtest/Makefile
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ head/tools/tools/qrndtest/Makefile	Thu Feb  5 20:23:36 2015	(r278280)
@@ -0,0 +1,11 @@
+#
+# $FreeBSD$
+#
+
+PROG = qrndtest
+
+SRCS = r.c
+
+NO_MAN=
+
+.include <bsd.prog.mk>

Added: head/tools/tools/qrndtest/README
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ head/tools/tools/qrndtest/README	Thu Feb  5 20:23:36 2015	(r278280)
@@ -0,0 +1,4 @@
+This is a really quick random testing that I wrote for adrian.
+
+If you want a real randomness tester, look at dieharder that has a much
+larger battery of tests and will tell you if your PRNG is good or not.

Added: head/tools/tools/qrndtest/r.c
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ head/tools/tools/qrndtest/r.c	Thu Feb  5 20:23:36 2015	(r278280)
@@ -0,0 +1,81 @@
+/*-
+ * Copyright 2015 John-Mark Gurney.
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
+ *	$FreeBSD$
+ *
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <strings.h>
+
+typedef uint32_t (*rndfun_t)();
+
+uint32_t
+randomwrap()
+{
+	return random();
+}
+
+struct {
+	const char *name;
+	rndfun_t rndfun;
+} rndfuns[] = {
+	{ "random", randomwrap },
+	{ "arc4random", arc4random },
+	{ NULL, NULL },
+};
+
+int
+main(int argc, char *argv[])
+{
+	uint64_t vals[4] = {};
+	uint64_t avg;
+	unsigned int i;
+	rndfun_t f;
+
+	if (argc == 1)
+		f = rndfuns[0].rndfun;
+	else {
+		for (i = 0; rndfuns[i].name != NULL; i++) {
+			if (strcasecmp(rndfuns[i].name, argv[1]) == 0)
+				break;
+		}
+		if (rndfuns[i].name == NULL)
+			return 1;
+		f = rndfuns[i].rndfun;
+	}
+
+	for (;;) {
+		vals[f() % 4]++;
+		if (((i++) % (4*1024*1024)) == 0) {
+			avg = vals[0] + vals[1] + vals[2] + vals[3];
+			avg /= 4;
+			printf("%d: %ld %ld %ld %ld\n", i, vals[0] - avg, vals[1] - avg, vals[2] - avg, vals[3] - avg);
+		}
+	}
+	return 0;
+}