1*e89a43e9Sdrochner /* $NetBSD: erand48.c,v 1.9 2006/03/22 20:52:16 drochner Exp $ */ 24e067afcSperry 3933a7b3aSbrezak /* 4933a7b3aSbrezak * Copyright (c) 1993 Martin Birgmeier 5933a7b3aSbrezak * All rights reserved. 6933a7b3aSbrezak * 7933a7b3aSbrezak * You may redistribute unmodified or modified versions of this source 8933a7b3aSbrezak * code provided that the above copyright notice and this and the 9933a7b3aSbrezak * following conditions are retained. 10933a7b3aSbrezak * 11933a7b3aSbrezak * This software is provided ``as is'', and comes with no warranties 12933a7b3aSbrezak * of any kind. I shall in no event be liable for anything that happens 13933a7b3aSbrezak * to anyone/anything when using this software. 14933a7b3aSbrezak */ 15933a7b3aSbrezak 1688c3eadbSlukem #include <sys/cdefs.h> 1788c3eadbSlukem #if defined(LIBC_SCCS) && !defined(lint) 18*e89a43e9Sdrochner __RCSID("$NetBSD: erand48.c,v 1.9 2006/03/22 20:52:16 drochner Exp $"); 1988c3eadbSlukem #endif /* LIBC_SCCS and not lint */ 2088c3eadbSlukem 2143fa6fe3Sjtc #include "namespace.h" 22b48252f3Slukem 23b48252f3Slukem #include <assert.h> 24*e89a43e9Sdrochner #include <math.h> 25b48252f3Slukem 26933a7b3aSbrezak #include "rand48.h" 27933a7b3aSbrezak 2843fa6fe3Sjtc #ifdef __weak_alias __weak_alias(erand48,_erand48)2960549036Smycroft__weak_alias(erand48,_erand48) 3043fa6fe3Sjtc #endif 3143fa6fe3Sjtc 32933a7b3aSbrezak double 33933a7b3aSbrezak erand48(unsigned short xseed[3]) 34933a7b3aSbrezak { 35b48252f3Slukem 36b48252f3Slukem _DIAGASSERT(xseed != NULL); 37b48252f3Slukem 38aa13ae60Sjtc __dorand48(xseed); 39933a7b3aSbrezak return ldexp((double) xseed[0], -48) + 40933a7b3aSbrezak ldexp((double) xseed[1], -32) + 41933a7b3aSbrezak ldexp((double) xseed[2], -16); 42933a7b3aSbrezak } 43