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55 lines
1.3 KiB
C
55 lines
1.3 KiB
C
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/* @(#)w_scalb.c 5.1 93/09/24 */
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#include <sys/cdefs.h>
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#if defined(LIBM_SCCS) && !defined(lint)
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__RCSID("$NetBSD: w_scalb.c,v 1.9 2002/05/26 22:02:02 wiz Exp $");
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#endif
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/*
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* wrapper scalb(double x, double fn) is provide for
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* passing various standard test suite. One
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* should use scalbn() instead.
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*/
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#include "math.h"
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#include "math_private.h"
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#include <errno.h>
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#ifdef _SCALB_INT
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double
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scalb(double x, int fn) /* wrapper scalb */
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#else
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double
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scalb(double x, double fn) /* wrapper scalb */
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#endif
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{
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#ifdef _IEEE_LIBM
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return __ieee754_scalb(x,fn);
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#else
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double z;
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z = __ieee754_scalb(x,fn);
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if(_LIB_VERSION == _IEEE_) return z;
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if(!(finite(z)||isnan(z))&&finite(x)) {
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return __kernel_standard(x,(double)fn,32); /* scalb overflow */
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}
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if(z==0.0&&z!=x) {
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return __kernel_standard(x,(double)fn,33); /* scalb underflow */
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}
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#ifndef _SCALB_INT
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if(!finite(fn)) errno = ERANGE;
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#endif
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return z;
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#endif
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}
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