1/* @(#)w_lgamma.c 5.1 93/09/24 */
2/*
3 * ====================================================
4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5 *
6 * Developed at SunPro, a Sun Microsystems, Inc. business.
7 * Permission to use, copy, modify, and distribute this
8 * software is freely granted, provided that this notice
9 * is preserved.
10 * ====================================================
11 */
12
13#if defined(LIBM_SCCS) && !defined(lint)
14static char rcsid[] = "$NetBSD: w_lgamma.c,v 1.6 1995/05/10 20:49:24 jtc Exp $";
15#endif
16
17/* double lgamma(double x)
18 * Return the logarithm of the Gamma function of x.
19 *
20 * Method: call __ieee754_lgamma_r
21 */
22
23#include "math.h"
24#include "math_private.h"
25
26#ifdef __STDC__
27	double __lgamma(double x)
28#else
29	double __lgamma(x)
30	double x;
31#endif
32{
33#ifdef _IEEE_LIBM
34	return __ieee754_lgamma_r(x,&signgam);
35#else
36        double y;
37	int local_signgam = 0;
38        y = __ieee754_lgamma_r(x,&local_signgam);
39	if (_LIB_VERSION != _ISOC_)
40	  /* ISO C99 does not define the global variable.  */
41	  signgam = local_signgam;
42        if(_LIB_VERSION == _IEEE_) return y;
43        if(!__finite(y)&&__finite(x)) {
44            if(__floor(x)==x&&x<=0.0)
45                return __kernel_standard(x,x,15); /* lgamma pole */
46            else
47                return __kernel_standard(x,x,14); /* lgamma overflow */
48        } else
49            return y;
50#endif
51}
52weak_alias (__lgamma, lgamma)
53strong_alias (__lgamma, __gamma)
54weak_alias (__gamma, gamma)
55#ifdef NO_LONG_DOUBLE
56strong_alias (__lgamma, __lgammal)
57weak_alias (__lgamma, lgammal)
58strong_alias (__gamma, __gammal)
59weak_alias (__gamma, gammal)
60#endif
61