1/*-
2 * Copyright 2015 John-Mark Gurney.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 */
27
28#include <stdint.h>
29#include <stdio.h>
30#include <stdlib.h>
31#include <strings.h>
32
33typedef uint32_t (*rndfun_t)();
34
35uint32_t
36randomwrap()
37{
38	return random();
39}
40
41struct {
42	const char *name;
43	rndfun_t rndfun;
44} rndfuns[] = {
45	{ "random", randomwrap },
46	{ "arc4random", arc4random },
47	{ NULL, NULL },
48};
49
50int
51main(int argc, char *argv[])
52{
53	uint64_t vals[4] = {};
54	uint64_t avg;
55	unsigned int i;
56	rndfun_t f;
57
58	if (argc == 1)
59		f = rndfuns[0].rndfun;
60	else {
61		for (i = 0; rndfuns[i].name != NULL; i++) {
62			if (strcasecmp(rndfuns[i].name, argv[1]) == 0)
63				break;
64		}
65		if (rndfuns[i].name == NULL)
66			return 1;
67		f = rndfuns[i].rndfun;
68	}
69
70	for (;;) {
71		vals[f() % 4]++;
72		if (((i++) % (4*1024*1024)) == 0) {
73			avg = vals[0] + vals[1] + vals[2] + vals[3];
74			avg /= 4;
75			printf("%d: %ld %ld %ld %ld\n", i, vals[0] - avg, vals[1] - avg, vals[2] - avg, vals[3] - avg);
76		}
77	}
78	return 0;
79}
80