55 lines
1.3 KiB
C
55 lines
1.3 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.
|
|
* ====================================================
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#if defined(LIBM_SCCS) && !defined(lint)
|
|
__RCSID("$NetBSD: w_scalb.c,v 1.9 2002/05/26 22:02:02 wiz 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 _SCALB_INT
|
|
double
|
|
scalb(double x, int fn) /* wrapper scalb */
|
|
#else
|
|
double
|
|
scalb(double x, double fn) /* wrapper scalb */
|
|
#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)) errno = ERANGE;
|
|
#endif
|
|
return z;
|
|
#endif
|
|
}
|