Line data    Source code

       1             : /* Convert string to double, using the C locale.
       2             : 
       3             :    Copyright (C) 2003-2004, 2006, 2009-2016 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 <errno.h>
      25             : #include <locale.h>
      26             : #include <stdlib.h>
      27             : #include <string.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             : #if defined LC_ALL_MASK && (LONG ? HAVE_STRTOLD_L : HAVE_STRTOD_L)
      47             : 
      48             : /* Cache for the C locale object.
      49             :    Marked volatile so that different threads see the same value
      50             :    (avoids locking).  */
      51             : static volatile locale_t c_locale_cache;
      52             : 
      53             : /* Return the C locale object, or (locale_t) 0 with errno set
      54             :    if it cannot be created.  */
      55             : static locale_t
      56           8 : c_locale (void)
      57             : {
      58           8 :   if (!c_locale_cache)
      59           1 :     c_locale_cache = newlocale (LC_ALL_MASK, "C", (locale_t) 0);
      60           8 :   return c_locale_cache;
      61             : }
      62             : 
      63             : #endif
      64             : 
      65             : DOUBLE
      66           8 : C_STRTOD (char const *nptr, char **endptr)
      67             : {
      68             :   DOUBLE r;
      69             : 
      70             : #if defined LC_ALL_MASK && (LONG ? HAVE_STRTOLD_L : HAVE_STRTOD_L)
      71             : 
      72           8 :   locale_t locale = c_locale ();
      73           8 :   if (!locale)
      74             :     {
      75           0 :       if (endptr)
      76           0 :         *endptr = (char *) nptr;
      77           0 :       return 0; /* errno is set here */
      78             :     }
      79             : 
      80           8 :   r = STRTOD_L (nptr, endptr, locale);
      81             : 
      82             : #else
      83             : 
      84             :   char *saved_locale = setlocale (LC_NUMERIC, NULL);
      85             : 
      86             :   if (saved_locale)
      87             :     {
      88             :       saved_locale = strdup (saved_locale);
      89             :       if (saved_locale == NULL)
      90             :         {
      91             :           if (endptr)
      92             :             *endptr = (char *) nptr;
      93             :           return 0; /* errno is set here */
      94             :         }
      95             :       setlocale (LC_NUMERIC, "C");
      96             :     }
      97             : 
      98             :   r = STRTOD (nptr, endptr);
      99             : 
     100             :   if (saved_locale)
     101             :     {
     102             :       int saved_errno = errno;
     103             : 
     104             :       setlocale (LC_NUMERIC, saved_locale);
     105             :       free (saved_locale);
     106             :       errno = saved_errno;
     107             :     }
     108             : 
     109             : #endif
     110             : 
     111           8 :   return r;
     112             : }