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- /* @(#)w_lgamma.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.
- * ====================================================
- */
- #if defined(LIBM_SCCS) && !defined(lint)
- static char rcsid[] = "$NetBSD: w_lgamma.c,v 1.6 1995/05/10 20:49:24 jtc Exp $";
- #endif
- /* double lgamma(double x)
- * Return the logarithm of the Gamma function of x.
- *
- * Method: call __ieee754_lgamma_r
- */
- #include "math.h"
- #include "math_private.h"
- extern int signgam;
- #ifdef __STDC__
- double lgamma(double x)
- #else
- double lgamma(x)
- double x;
- #endif
- {
- #ifdef _IEEE_LIBM
- return __ieee754_lgamma_r(x,&signgam);
- #else
- double y;
- y = __ieee754_lgamma_r(x,&signgam);
- if(_LIB_VERSION == _IEEE_) return y;
- if(!finite(y)&&finite(x)) {
- if(floor(x)==x&&x<=0.0)
- return __kernel_standard(x,x,15); /* lgamma pole */
- else
- return __kernel_standard(x,x,14); /* lgamma overflow */
- } else
- return y;
- #endif
- }
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