/* w_jnl.c -- long double version of w_jn.c.

 * Conversion to long double by Ulrich Drepper,

 * Cygnus Support, drepper@cygnus.com.

 */

/*

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

 * 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: $";

#endif

/*

 * wrapper jn(int n, double x), yn(int n, double x)

 * floating point Bessel's function of the 1st and 2nd kind

 * of order n

 *

 * Special cases:

 *	y0(0)=y1(0)=yn(n,0) = -inf with division by zero signal;

 *	y0(-ve)=y1(-ve)=yn(n,-ve) are NaN with invalid signal.

 * Note 2. About jn(n,x), yn(n,x)

 *	For n=0, j0(x) is called,

 *	for n=1, j1(x) is called,

 *	for n

 *	from values of j0(x) and j1(x).

 *	for n>x, a continued fraction approximation to

 *	j(n,x)/j(n-1,x) is evaluated and then backward

 *	recursion is used starting from a supposed value

 *	for j(n,x). The resulting value of j(0,x) is

 *	compared with the actual value to correct the

 *	supposed value of j(n,x).

 *

 *	yn(n,x) is similar in all respects, except

 *	that forward recursion is used for all

 *	values of n>1.

 *

 */

#include <math.h>

#include <math_private.h>

#include <math-svid-compat.h>

#include <libm-alias-ldouble.h>

#if LIBM_SVID_COMPAT

long double __jnl(int n, long double x)	/* wrapper jnl */

{

# ifdef _IEEE_LIBM

	return __ieee754_jnl(n,x);

# else

	long double z;

	z = __ieee754_jnl(n,x);

	if (_LIB_VERSION == _IEEE_

	    || _LIB_VERSION == _POSIX_

	    || isnan(x))

	  return z;

	if(fabsl(x)>X_TLOSS) {

	    return __kernel_standard_l((double)n,x,238); /* jn(|x|>X_TLOSS,n) */

	} else

	    return z;

# endif

}

libm_alias_ldouble (__jn, jn)

long double __ynl(int n, long double x)	/* wrapper ynl */

{

# ifdef _IEEE_LIBM

	return __ieee754_ynl(n,x);

# else

	long double z;

	z = __ieee754_ynl(n,x);

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

        if(x <= 0.0){

                if(x==0.0)

                    /* d= -one/(x-x); */

                    return __kernel_standard_l((double)n,x,212);

                else

                    /* d = zero/(x-x); */

                    return __kernel_standard_l((double)n,x,213);

        }

	if(x>X_TLOSS && _LIB_VERSION != _POSIX_) {

	    return __kernel_standard_l((double)n,x,239); /* yn(x>X_TLOSS,n) */

	} else

	    return z;

# endif

}

libm_alias_ldouble (__yn, yn)

#endif