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