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 33 typedef uint32_t (*rndfun_t)(); 34 35 uint32_t 36 randomwrap() 37 { 38 return random(); 39 } 40 41 struct { 42 const char *name; 43 rndfun_t rndfun; 44 } rndfuns[] = { 45 { "random", randomwrap }, 46 { "arc4random", arc4random }, 47 { NULL, NULL }, 48 }; 49 50 int 51 main(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