gl/c-strtod.c

   1 /* Convert string to double, using the C locale.
   2
   3    Copyright (C) 2003, 2004, 2006 Free Software Foundation, Inc.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program 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
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 /* Written by Paul Eggert.  */
  19
  20 #include <config.h>
  21
  22 #include "c-strtod.h"
  23
  24 #include <locale.h>
  25 #include <stdlib.h>
  26
  27 #include "xalloc.h"
  28
  29 #if LONG
  30 # define C_STRTOD c_strtold
  31 # define DOUBLE long double
  32 # define STRTOD_L strtold_l
  33 #else
  34 # define C_STRTOD c_strtod
  35 # define DOUBLE double
  36 # define STRTOD_L strtod_l
  37 #endif
  38
  39 /* c_strtold falls back on strtod if strtold doesn't conform to C99.  */
  40 #if LONG && HAVE_C99_STRTOLD
  41 # define STRTOD strtold
  42 #else
  43 # define STRTOD strtod
  44 #endif
  45
  46 DOUBLE
  47 C_STRTOD (char const *nptr, char **endptr)
  48 {
  49   DOUBLE r;
  50
  51 #ifdef LC_ALL_MASK
  52
  53   locale_t c_locale = newlocale (LC_ALL_MASK, "C", 0);
  54   r = STRTOD_L (nptr, endptr, c_locale);
  55   freelocale (c_locale);
  56
  57 #else
  58
  59   char *saved_locale = setlocale (LC_NUMERIC, NULL);
  60
  61   if (saved_locale)
  62     {
  63       saved_locale = xstrdup (saved_locale);
  64       setlocale (LC_NUMERIC, "C");
  65     }
  66
  67   r = STRTOD (nptr, endptr);
  68
  69   if (saved_locale)
  70     {
  71       setlocale (LC_NUMERIC, saved_locale);
  72       free (saved_locale);
  73     }
  74
  75 #endif
  76
  77   return r;
  78 }