50 lines
1.0 KiB
C
50 lines
1.0 KiB
C
/*
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* zzuf - general purpose fuzzer
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* Copyright (c) 2006 Sam Hocevar <sam@zoy.org>
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* All Rights Reserved
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*
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* $Id$
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*
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* This program is free software. It comes without any warranty, to
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* the extent permitted by applicable law. You can redistribute it
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* and/or modify it under the terms of the Do What The Fuck You Want
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* To Public License, Version 2, as published by Sam Hocevar. See
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* http://sam.zoy.org/wtfpl/COPYING for more details.
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*/
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/*
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* random.c: pseudorandom number generator
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*/
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#include "config.h"
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#if defined HAVE_STDINT_H
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# include <stdint.h>
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#elif defined HAVE_INTTYPES_H
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# include <inttypes.h>
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#endif
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#include <stdlib.h>
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#include "random.h"
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static unsigned long ctx = 1;
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void _zz_srand(uint32_t seed)
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{
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ctx = (seed ^ 0x12345678);
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}
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uint32_t _zz_rand(uint32_t max)
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{
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/* Could be better, but do we care? */
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long hi, lo, x;
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hi = ctx / 12773L;
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lo = ctx % 12773L;
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x = 16807L * lo - 2836L * hi;
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if(x <= 0)
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x += 0x7fffffffL;
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return (ctx = x) % (unsigned long)max;
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}
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