scalb.c

/*
 *                               POK header
 * 
 * The following file is a part of the POK project. Any modification should
 * made according to the POK licence. You CANNOT use this file or a part of
 * this file is this part of a file for your own project
 *
 * For more information on the POK licence, please see our LICENCE FILE
 *
 * Please follow the coding guidelines described in doc/CODING_GUIDELINES
 *
 *                                      Copyright (c) 2007-2009 POK team 
 *
 * Created by julien on Fri Jan 30 14:41:34 2009 
 */

/* @(#)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.
 * ====================================================
 */

#ifdef POK_NEEDS_LIBMATH

/*
 * wrapper scalb(double x, double fn) is provide for
 * passing various standard test suite. One
 * should use scalbn() instead.
 */

#include <libm.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 = POK_ERRNO_ERANGE;
#endif
        return z;
#endif
}

#endif