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