1  /* Wrapper to set errno for tgamma.
       2     Copyright (C) 2017-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  /* Only build wrappers from the templates for the types that define the macro
      20     below.  This macro is set in math-type-macros-<type>.h in sysdeps/generic
      21     for each floating-point type.  */
      22  #if __USE_WRAPPER_TEMPLATE
      23  
      24  # include <errno.h>
      25  # include <fenv.h>
      26  # include <math.h>
      27  # include <math_private.h>
      28  
      29  #define M_CALL_FUNC_X(x) x ## _r
      30  #define M_CALL_FUNC(x) M_CALL_FUNC_X (x)
      31  
      32  FLOAT
      33  M_DECL_FUNC (__tgamma) (FLOAT x)
      34  {
      35    int local_signgam;
      36    FLOAT y = M_CALL_FUNC (M_SUF (__ieee754_gamma)) (x, &local_signgam);
      37  
      38    if (__glibc_unlikely (!isfinite (y) || y == 0)
      39        && (isfinite (x) || (isinf (x) && x < 0)))
      40      {
      41        if (x == 0)
      42  	/* Pole error: tgamma(x=0).  */
      43  	__set_errno (ERANGE);
      44        else if (M_SUF (floor) (x) == x && x < 0)
      45  	/* Domain error: tgamma(integer x<0).  */
      46  	__set_errno (EDOM);
      47        else
      48  	/* Overflow or underflow.  */
      49  	__set_errno (ERANGE);
      50      }
      51    return local_signgam < 0 ? -y : y;
      52  }
      53  declare_mgen_alias (__tgamma, tgamma)
      54  
      55  #endif /* __USE_WRAPPER_TEMPLATE.  */