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 2, or (at your option)
   8    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, write to the Free Software Foundation,
  17    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
  18
  19 /* Written by Paul Eggert.  */
  20
  21 #include <config.h>
  22
  23 #include "c-strtod.h"
  24
  25 #include <locale.h>
  26 #include <stdlib.h>
  27
  28 #include "xalloc.h"
  29
  30 #if LONG
  31 # define C_STRTOD c_strtold
  32 # define DOUBLE long double
  33 # define STRTOD_L strtold_l
  34 #else
  35 # define C_STRTOD c_strtod
  36 # define DOUBLE double
  37 # define STRTOD_L strtod_l
  38 #endif
  39
  40 /* c_strtold falls back on strtod if strtold doesn't conform to C99.  */
  41 #if LONG && HAVE_C99_STRTOLD
  42 # define STRTOD strtold
  43 #else
  44 # define STRTOD strtod
  45 #endif
  46
  47 DOUBLE
  48 C_STRTOD (char const *nptr, char **endptr)
  49 {
  50   DOUBLE r;
  51
  52 #ifdef LC_ALL_MASK
  53
  54   locale_t c_locale = newlocale (LC_ALL_MASK, "C", 0);
  55   r = STRTOD_L (nptr, endptr, c_locale);
  56   freelocale (c_locale);
  57
  58 #else
  59
  60   char *saved_locale = setlocale (LC_NUMERIC, NULL);
  61
  62   if (saved_locale)
  63     {
  64       saved_locale = xstrdup (saved_locale);
  65       setlocale (LC_NUMERIC, "C");
  66     }
  67
  68   r = STRTOD (nptr, endptr);
  69
  70   if (saved_locale)
  71     {
  72       setlocale (LC_NUMERIC, saved_locale);
  73       free (saved_locale);
  74     }
  75
  76 #endif
  77
  78   return r;
  79 }