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  1. /* wf_lgamma.c -- float version of w_lgamma.c.
  2.  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
  3.  */
  4.  
  5. /*
  6.  * ====================================================
  7.  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
  8.  *
  9.  * Developed at SunPro, a Sun Microsystems, Inc. business.
  10.  * Permission to use, copy, modify, and distribute this
  11.  * software is freely granted, provided that this notice
  12.  * is preserved.
  13.  * ====================================================
  14.  *
  15.  */
  16.  
  17. #include "fdlibm.h"
  18. #include <reent.h>
  19. #include <errno.h>
  20.  
  21. #ifdef __STDC__
  22.         float lgammaf(float x)
  23. #else
  24.         float lgammaf(x)
  25.         float x;
  26. #endif
  27. {
  28. #ifdef _IEEE_LIBM
  29.         return __ieee754_lgammaf_r(x,&(_REENT_SIGNGAM(_REENT)));
  30. #else
  31.         float y;
  32.         struct exception exc;
  33.         y = __ieee754_lgammaf_r(x,&(_REENT_SIGNGAM(_REENT)));
  34.         if(_LIB_VERSION == _IEEE_) return y;
  35.         if(!finitef(y)&&finitef(x)) {
  36. #ifndef HUGE_VAL
  37. #define HUGE_VAL inf
  38.             double inf = 0.0;
  39.  
  40.             SET_HIGH_WORD(inf,0x7ff00000);      /* set inf to infinite */
  41. #endif
  42.             exc.name = "lgammaf";
  43.             exc.err = 0;
  44.             exc.arg1 = exc.arg2 = (double)x;
  45.             if (_LIB_VERSION == _SVID_)
  46.                exc.retval = HUGE;
  47.             else
  48.                exc.retval = HUGE_VAL;
  49.             if(floorf(x)==x&&x<=(float)0.0) {
  50.                 /* lgammaf(-integer) */
  51.                 exc.type = SING;
  52.                 if (_LIB_VERSION == _POSIX_)
  53.                    errno = EDOM;
  54.                 else if (!matherr(&exc)) {
  55.                    errno = EDOM;
  56.                 }
  57.  
  58.             } else {
  59.                 /* lgammaf(finite) overflow */
  60.                 exc.type = OVERFLOW;
  61.                 if (_LIB_VERSION == _POSIX_)
  62.                    errno = ERANGE;
  63.                 else if (!matherr(&exc)) {
  64.                    errno = ERANGE;
  65.                 }
  66.             }
  67.             if (exc.err != 0)
  68.                errno = exc.err;
  69.             return (float)exc.retval;
  70.         } else
  71.             return y;
  72. #endif
  73. }            
  74.  
  75. #ifdef _DOUBLE_IS_32BITS
  76.  
  77. #ifdef __STDC__
  78.         double lgamma(double x)
  79. #else
  80.         double lgamma(x)
  81.         double x;
  82. #endif
  83. {
  84.         return (double) lgammaf((float) x);
  85. }
  86.  
  87. #endif /* defined(_DOUBLE_IS_32BITS) */
  88.