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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)) errno = ERANGE;

#endif

        return z;

#endif 

}