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/* @(#)w_lgamma.c 1.3 95/01/18 */
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunSoft, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*
*/

/* double ieee_lgamma(double x)
* Return the logarithm of the Gamma function of x.
*
* Method: call __ieee754_lgamma_r
*/

#include "fdlibm.h"

extern int signgam;

#ifdef __STDC__
double ieee_lgamma(double x)
#else
double ieee_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(!ieee_finite(y)&&ieee_finite(x)) {
            if(ieee_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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