/* @(#)w_atanh.c 1.3 95/01/18 */

/*

 * ====================================================

 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

 *

 * Developed at SunSoft, a Sun Microsystems, Inc. business.

 * Permission to use, copy, modify, and distribute this

 * software is freely granted, provided that this notice 

 * is preserved.

 * ====================================================

 */

/* 

 * wrapper atanh(x)

 */

#include "fdlibm.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

}