math/w_log1p.c

   1 /* Wrapper for __log1p that handles setting errno.
   2    Copyright (C) 2015 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 #include <errno.h>
  20 #include <math.h>
  21 #include <math_private.h>
  22
  23 double
  24 __w_log1p (double x)
  25 {
  26   if (__glibc_unlikely (islessequal (x, -1.0)))
  27     {
  28       if (x == -1.0)
  29         __set_errno (ERANGE);
  30       else
  31         __set_errno (EDOM);
  32     }
  33
  34   return __log1p (x);
  35 }
  36 weak_alias (__w_log1p, log1p)
  37
  38 #ifdef NO_LONG_DOUBLE
  39 strong_alias (__w_log1p, __log1pl)
  40 weak_alias (__w_log1p, log1pl)
  41 #endif