w_jn.c

freedos32的源代码

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

#ifndef lint
static char rcsid[] = "$\Id: w_jn.c,v 1.2.6.1 1997/03/03 14:21:06 bde Exp $";
#endif

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

#include "math.h"
#include "math_private.h"

#ifdef __STDC__
	double jn(int n, double x)	/* wrapper jn */
#else
	double jn(n,x)			/* wrapper jn */
	double x; int n;
#endif
{
#ifdef _IEEE_LIBM
	return __ieee754_jn(n,x);
#else
	double z;
	z = __ieee754_jn(n,x);
	if(_LIB_VERSION == _IEEE_ || isnan(x) ) return z;
	if(fabs(x)>X_TLOSS) {
	    return __kernel_standard((double)n,x,38); /* jn(|x|>X_TLOSS,n) */
	} else
	    return z;
#endif
}