1  /* Wrapper to set errno for atanh.
       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  FLOAT
      30  M_DECL_FUNC (__atanh) (FLOAT x)
      31  {
      32    if (__glibc_unlikely (isgreaterequal (M_FABS (x), M_LIT (1.0))))
      33      {
      34        if (M_FABS (x) == 1)
      35  	/* Pole error: atanh(|x|==1).  */
      36  	__set_errno (ERANGE);
      37        else
      38  	/* Domain error: atanh(|x|>1).  */
      39  	__set_errno (EDOM);
      40      }
      41    return M_SUF (__ieee754_atanh) (x);
      42  }
      43  declare_mgen_alias (__atanh, atanh)
      44  
      45  #endif /* __USE_WRAPPER_TEMPLATE.  */