math/w_jn_template.c

   1 /* Wrapper to set errno for jn and yn.
   2    Copyright (C) 2017-2018 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    <http://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 (__jn) (int n, FLOAT x)
  31 {
  32   return M_SUF (__ieee754_jn) (n, x);
  33 }
  34 declare_mgen_alias (__jn, jn)
  35
  36 FLOAT
  37 M_DECL_FUNC (__yn) (int n, FLOAT x)
  38 {
  39   if (__glibc_unlikely (islessequal (x, M_LIT (0.0))))
  40     {
  41       if (x < 0)
  42         /* Domain error: yn(x<0).  */
  43         __set_errno (EDOM);
  44       else if (x == 0)
  45         /* Pole error: yn(0).  */
  46         __set_errno (ERANGE);
  47     }
  48   return M_SUF (__ieee754_yn) (n, x);
  49 }
  50 declare_mgen_alias (__yn, yn)
  51
  52 #endif /* __USE_WRAPPER_TEMPLATE.  */