xref: /freebsd/tools/tools/qrndtest/r.c (revision 81ad6265)
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  *	$FreeBSD$
27  *
28  */
29 
30 #include <stdint.h>
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <strings.h>
34 
35 typedef uint32_t (*rndfun_t)();
36 
37 uint32_t
38 randomwrap()
39 {
40 	return random();
41 }
42 
43 struct {
44 	const char *name;
45 	rndfun_t rndfun;
46 } rndfuns[] = {
47 	{ "random", randomwrap },
48 	{ "arc4random", arc4random },
49 	{ NULL, NULL },
50 };
51 
52 int
53 main(int argc, char *argv[])
54 {
55 	uint64_t vals[4] = {};
56 	uint64_t avg;
57 	unsigned int i;
58 	rndfun_t f;
59 
60 	if (argc == 1)
61 		f = rndfuns[0].rndfun;
62 	else {
63 		for (i = 0; rndfuns[i].name != NULL; i++) {
64 			if (strcasecmp(rndfuns[i].name, argv[1]) == 0)
65 				break;
66 		}
67 		if (rndfuns[i].name == NULL)
68 			return 1;
69 		f = rndfuns[i].rndfun;
70 	}
71 
72 	for (;;) {
73 		vals[f() % 4]++;
74 		if (((i++) % (4*1024*1024)) == 0) {
75 			avg = vals[0] + vals[1] + vals[2] + vals[3];
76 			avg /= 4;
77 			printf("%d: %ld %ld %ld %ld\n", i, vals[0] - avg, vals[1] - avg, vals[2] - avg, vals[3] - avg);
78 		}
79 	}
80 	return 0;
81 }
82