erand48.c   [plain text]

/*
 * 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 <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/gen/erand48.c,v 1.2 2002/03/22 21:52:05 obrien Exp $");

#include "rand48.h"

double
erand48(unsigned short xseed[3])
{
	_dorand48(xseed);
	return ldexp((double) xseed[0], -48) +
	       ldexp((double) xseed[1], -32) +
	       ldexp((double) xseed[2], -16);
}