1  /* Wrapper to set errno for lgamma_r.
       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_DECL_FUNC_R_X(x) x ## _r
      30  #define M_DECL_FUNC_R_S(x) M_DECL_FUNC_R_X (x)
      31  #define M_DECL_FUNC_R(x) M_DECL_FUNC_R_S (M_SUF (x))
      32  
      33  #define M_CALL_FUNC_R_X(x) x ## _r
      34  #define M_CALL_FUNC_R_S(x) M_CALL_FUNC_R_X (x)
      35  #define M_CALL_FUNC_R(x) M_CALL_FUNC_R_S (M_SUF (x))
      36  
      37  FLOAT
      38  M_DECL_FUNC_R (__lgamma) (FLOAT x, int *signgamp)
      39  {
      40    FLOAT y = M_CALL_FUNC_R (__ieee754_lgamma) (x, signgamp);
      41    if (__glibc_unlikely (!isfinite (y)) && isfinite (x))
      42      /* Pole error: lgamma_r(integer x<0).  Or overflow.  */
      43      __set_errno (ERANGE);
      44    return y;
      45  }
      46  declare_mgen_alias_r (__lgamma, lgamma)
      47  
      48  #endif /* __USE_WRAPPER_TEMPLATE.  */