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  1.  
  2. /* @(#)wr_gamma.c 5.1 93/09/24 */
  3. /*
  4.  * ====================================================
  5.  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
  6.  *
  7.  * Developed at SunPro, a Sun Microsystems, Inc. business.
  8.  * Permission to use, copy, modify, and distribute this
  9.  * software is freely granted, provided that this notice
  10.  * is preserved.
  11.  * ====================================================
  12.  */
  13.  
  14. /*
  15.  * wrapper double gamma_r(double x, int *signgamp)
  16.  */
  17.  
  18. #include "fdlibm.h"
  19. #include <errno.h>
  20.  
  21. #ifndef _DOUBLE_IS_32BITS
  22.  
  23. #ifdef __STDC__
  24.         double gamma_r(double x, int *signgamp) /* wrapper lgamma_r */
  25. #else
  26.         double gamma_r(x,signgamp)              /* wrapper lgamma_r */
  27.         double x; int *signgamp;
  28. #endif
  29. {
  30. #ifdef _IEEE_LIBM
  31.         return __ieee754_gamma_r(x,signgamp);
  32. #else
  33.         double y;
  34.         struct exception exc;
  35.         y = __ieee754_gamma_r(x,signgamp);
  36.         if(_LIB_VERSION == _IEEE_) return y;
  37.         if(!finite(y)&&finite(x)) {
  38. #ifndef HUGE_VAL
  39. #define HUGE_VAL inf
  40.             double inf = 0.0;
  41.  
  42.             SET_HIGH_WORD(inf,0x7ff00000);      /* set inf to infinite */
  43. #endif
  44.             exc.name = "gamma";
  45.             exc.err = 0;
  46.             exc.arg1 = exc.arg2 = (double)x;
  47.             if (_LIB_VERSION == _SVID_)
  48.                 exc.retval = HUGE;
  49.             else
  50.                 exc.retval = HUGE_VAL;
  51.             if(floor(x)==x&&x<=0.0) {
  52.                 /* gamma(-integer) or gamma(0) */
  53.                 exc.type = SING;
  54.                 if (_LIB_VERSION == _POSIX_)
  55.                   errno = EDOM;
  56.                 else if (!matherr(&exc)) {
  57.                   errno = EDOM;
  58.                 }
  59.             } else {
  60.                 /* gamma(finite) overflow */
  61.                 exc.type = OVERFLOW;
  62.                 if (_LIB_VERSION == _POSIX_)
  63.                   errno = ERANGE;
  64.                 else if (!matherr(&exc)) {
  65.                   errno = ERANGE;
  66.                 }
  67.             }
  68.             if (exc.err != 0)
  69.                errno = exc.err;
  70.             return exc.retval;
  71.         } else
  72.             return y;
  73. #endif
  74. }
  75.  
  76. #endif /* defined(_DOUBLE_IS_32BITS) */
  77.