source: zzuf/trunk/src/common/random.c @ 4112

Last change on this file since 4112 was 4112, checked in by sam, 5 years ago

Reorganise source code to better separate zzuf and libzzuf. Note: the Win32
build is now broken.

  • Property svn:keywords set to Id
File size: 1.0 KB
Line 
1/*
2 *  zzuf - general purpose fuzzer
3 *  Copyright (c) 2006 Sam Hocevar <sam@zoy.org>
4 *                All Rights Reserved
5 *
6 *  $Id$
7 *
8 *  This program is free software. It comes without any warranty, to
9 *  the extent permitted by applicable law. You can redistribute it
10 *  and/or modify it under the terms of the Do What The Fuck You Want
11 *  To Public License, Version 2, as published by Sam Hocevar. See
12 *  http://sam.zoy.org/wtfpl/COPYING for more details.
13 */
14
15/*
16 *  random.c: pseudorandom number generator
17 */
18
19#include "config.h"
20
21#if defined HAVE_STDINT_H
22#   include <stdint.h>
23#elif defined HAVE_INTTYPES_H
24#   include <inttypes.h>
25#endif
26#include <stdlib.h>
27
28#include "random.h"
29
30static unsigned long ctx = 1;
31
32void _zz_srand(uint32_t seed)
33{
34    ctx = (seed ^ 0x12345678);
35}
36
37uint32_t _zz_rand(uint32_t max)
38{
39    /* Could be better, but do we care? */
40    long hi, lo, x;
41
42    hi = ctx / 12773L;
43    lo = ctx % 12773L;
44    x = 16807L * lo - 2836L * hi;
45    if(x <= 0)
46        x += 0x7fffffffL;
47    return (ctx = x) % (unsigned long)max;
48}
49
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