1/*	$NetBSD: erand48.c,v 1.9 2006/03/22 20:52:16 drochner Exp $	*/
2
3/*
4 * Copyright (c) 1993 Martin Birgmeier
5 * All rights reserved.
6 *
7 * You may redistribute unmodified or modified versions of this source
8 * code provided that the above copyright notice and this and the
9 * following conditions are retained.
10 *
11 * This software is provided ``as is'', and comes with no warranties
12 * of any kind. I shall in no event be liable for anything that happens
13 * to anyone/anything when using this software.
14 */
15
16#include <sys/cdefs.h>
17#if defined(LIBC_SCCS) && !defined(lint)
18__RCSID("$NetBSD: erand48.c,v 1.9 2006/03/22 20:52:16 drochner Exp $");
19#endif /* LIBC_SCCS and not lint */
20
21#include "namespace.h"
22
23#include <assert.h>
24#include <math.h>
25
26#include "rand48.h"
27
28#ifdef __weak_alias
29__weak_alias(erand48,_erand48)
30#endif
31
32double
33erand48(unsigned short xseed[3])
34{
35
36	_DIAGASSERT(xseed != NULL);
37
38	__dorand48(xseed);
39	return ldexp((double) xseed[0], -48) +
40	       ldexp((double) xseed[1], -32) +
41	       ldexp((double) xseed[2], -16);
42}
43