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glibc/math/w_scalb.c
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/* @(#)w_scalb.c 5.1 93/09/24 */ | |
/* | |
* ==================================================== | |
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. | |
* | |
* Developed at SunPro, a Sun Microsystems, Inc. business. | |
* Permission to use, copy, modify, and distribute this | |
* software is freely granted, provided that this notice | |
* is preserved. | |
* ==================================================== | |
*/ | |
#if defined(LIBM_SCCS) && !defined(lint) | |
static char rcsid[] = "$NetBSD: w_scalb.c,v 1.6 1995/05/10 20:49:48 jtc Exp $"; | |
#endif | |
/* | |
* wrapper scalb(double x, double fn) is provide for | |
* passing various standard test suite. One | |
* should use scalbn() instead. | |
*/ | |
#include "math.h" | |
#include "math_private.h" | |
#include <errno.h> | |
#ifdef __STDC__ | |
#ifdef _SCALB_INT | |
double __scalb(double x, int fn) /* wrapper scalb */ | |
#else | |
double __scalb(double x, double fn) /* wrapper scalb */ | |
#endif | |
#else | |
double __scalb(x,fn) /* wrapper scalb */ | |
#ifdef _SCALB_INT | |
double x; int fn; | |
#else | |
double x,fn; | |
#endif | |
#endif | |
{ | |
#ifdef _IEEE_LIBM | |
return __ieee754_scalb(x,fn); | |
#else | |
double z; | |
z = __ieee754_scalb(x,fn); | |
if(_LIB_VERSION == _IEEE_) return z; | |
if(!(__finite(z)||__isnan(z))&&__finite(x)) { | |
return __kernel_standard(x,(double)fn,32); /* scalb overflow */ | |
} | |
if(z==0.0&&z!=x) { | |
return __kernel_standard(x,(double)fn,33); /* scalb underflow */ | |
} | |
#ifndef _SCALB_INT | |
if(!__finite(fn)) __set_errno (ERANGE); | |
#endif | |
return z; | |
#endif | |
} | |
weak_alias (__scalb, scalb) | |
#ifdef NO_LONG_DOUBLE | |
strong_alias (__scalb, __scalbl) | |
weak_alias (__scalb, scalbl) | |
#endif |