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2 pj 1
/* @(#)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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#ifndef lint
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static char rcsid[] = "$\Id: w_scalb.c,v 1.2 1995/05/30 05:51:41 rgrimes 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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1621 fabio 26
#include <arch/errno.h>
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#ifdef __STDC__
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#ifdef _SCALB_INT
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        double scalb(double x, int fn)          /* wrapper scalb */
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#else
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        double scalb(double x, double fn)       /* wrapper scalb */
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#endif
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#else
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        double scalb(x,fn)                      /* wrapper scalb */
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#ifdef _SCALB_INT
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        double x; int fn;
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#else
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        double x,fn;
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#endif
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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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}