lib/libm/src/w_lgamma_r.c

   1 /* @(#)wr_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 #include <sys/cdefs.h>
  14 #if defined(LIBM_SCCS) && !defined(lint)
  15 __RCSID("$NetBSD: w_lgamma_r.c,v 1.10 2002/05/26 22:02:02 wiz Exp $");
  16 #endif
  17
  18 /*
  19  * wrapper double lgamma_r(double x, int *signgamp)
  20  */
  21
  22 #include "math.h"
  23 #include "math_private.h"
  24
  25 double
  26 lgamma_r(double x, int *signgamp) /* wrapper lgamma_r */
  27 {
  28 #ifdef _IEEE_LIBM
  29         return __ieee754_lgamma_r(x,signgamp);
  30 #else
  31         double y;
  32         y = __ieee754_lgamma_r(x,signgamp);
  33         if(_LIB_VERSION == _IEEE_) return y;
  34         if(!finite(y)&&finite(x)) {
  35             if(floor(x)==x&&x<=0.0)
  36                 return __kernel_standard(x,x,15); /* lgamma pole */
  37             else
  38                 return __kernel_standard(x,x,14); /* lgamma overflow */
  39         } else
  40             return y;
  41 #endif
  42 }