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/* $OpenBSD: drand48.c,v 1.7 2015/09/14 13:30:17 guenther Exp $ */
/*
* Copyright (c) 1993 Martin Birgmeier
* All rights reserved.
*
* You may redistribute unmodified or modified versions of this source
* code provided that the above copyright notice and this and the
* following conditions are retained.
*
* This software is provided ``as is'', and comes with no warranties
* of any kind. I shall in no event be liable for anything that happens
* to anyone/anything when using this software.
*/
#include <math.h>
#include "rand48.h"
double
drand48(void)
{
if (__rand48_deterministic == 0) {
unsigned short rseed[3];
arc4random_buf(rseed, sizeof rseed);
return ldexp((double) rseed[0], -48) +
ldexp((double) rseed[1], -32) +
ldexp((double) rseed[2], -16);
}
return erand48(__rand48_seed);
}
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