1 /* $OpenBSD: erand48.c,v 1.5 2015/09/14 13:30:17 guenther Exp $ */
2 /*
3 * Copyright (c) 1993 Martin Birgmeier
4 * All rights reserved.
5 *
6 * You may redistribute unmodified or modified versions of this source
7 * code provided that the above copyright notice and this and the
8 * following conditions are retained.
9 *
10 * This software is provided ``as is'', and comes with no warranties
11 * of any kind. I shall in no event be liable for anything that happens
12 * to anyone/anything when using this software.
13 */
14
15 #include <math.h>
16 #include "rand48.h"
17
18 double
erand48(unsigned short xseed[3])19 erand48(unsigned short xseed[3])
20 {
21 __dorand48(xseed);
22 return ldexp((double) xseed[0], -48) +
23 ldexp((double) xseed[1], -32) +
24 ldexp((double) xseed[2], -16);
25 }
26 DEF_WEAK(erand48);
27