svn commit: r278280 - head/tools/tools/qrndtest
John-Mark Gurney
jmg at FreeBSD.org
Thu Feb 5 20:23:38 UTC 2015
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;
+}
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