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/* @(#)w_atanh.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_atanh.c,v 1.6 1995/05/10 20:48:43 jtc Exp $";

#endif

/*

 * wrapper atanh(x)

 */

#include "math.h"

#include "math_private.h"

#ifdef __STDC__

        double atanh(double x)          /* wrapper atanh */

#else

        double atanh(x)                 /* wrapper atanh */

        double x;

#endif

{

#ifdef _IEEE_LIBM

        return __ieee754_atanh(x);

#else

        double z,y;

        z = __ieee754_atanh(x);

        if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;

        y = fabs(x);

        if(y>=1.0) {

            if(y>1.0)

                return __kernel_standard(x,x,30); /* atanh(|x|>1) */

            else

                return __kernel_standard(x,x,31); /* atanh(|x|==1) */

        } else

            return z;

#endif

}