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Fixing the previous commit.

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This commit is contained in:
Markus Kauppila 2011-07-24 18:58:36 +03:00
parent afbf90dc78
commit fc76a5fa6a
9 changed files with 1056 additions and 1 deletions
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63
test/test-automation/fuzzer/utl_random.c Executable file
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@ -0,0 +1,63 @@
/*
utl_random
A "32-bit Multiply with carry" random number generator.
*/
#include "utl_random.h"
/* Initialize random number generator with two integer variables */
void utl_randomInit(RND_CTX * rndContext, unsigned int xi, unsigned int ci)
{
/*
* Choose a value for 'a' from this list
* 1791398085 1929682203 1683268614 1965537969 1675393560
* 1967773755 1517746329 1447497129 1655692410 1606218150
* 2051013963 1075433238 1557985959 1781943330 1893513180
* 1631296680 2131995753 2083801278 1873196400 1554115554
*/
rndContext->a = 1655692410;
rndContext->x = 30903;
rndContext->c = 0;
if (xi != 0)
rndContext->x = xi;
rndContext->c = ci;
rndContext->ah = rndContext->a >> 16;
rndContext->al = rndContext->a & 65535;
}
/* Initialize random number generator from time */
void utl_randomInitTime(RND_CTX * rndContext)
{
int a,b;
srand(time(NULL));
a=rand();
srand(clock());
b=rand();
utl_randomInit(rndContext, a, b);
}
/* Returns random numbers */
unsigned int utl_random(RND_CTX * rndContext)
{
unsigned int xh, xl;
xh = rndContext->x >> 16, xl = rndContext->x & 65535;
rndContext->x = rndContext->x * rndContext->a + rndContext->c;
rndContext->c =
xh * rndContext->ah + ((xh * rndContext->al) >> 16) +
((xl * rndContext->ah) >> 16);
if (xl * rndContext->al >= (~rndContext->c + 1))
rndContext->c++;
return (rndContext->x);
}