glibc/sysdeps/generic/w_scalb.c
Ulrich Drepper e275093526 Update.
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2001-02-17 01:47:54 +00:00

66 lines
1.5 KiB
C

/* @(#)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 != _SVID_) 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