lib/duplocale.c

   1 /* Duplicate a locale object.
   2    Copyright (C) 2009, 2010 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU Lesser General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
  18
  19 #include <config.h>
  20
  21 /* Specification.  */
  22 #include <locale.h>
  23
  24 #include <errno.h>
  25 #include <string.h>
  26
  27 #define SIZEOF(a) (sizeof(a) / sizeof(a[0]))
  28
  29 #undef duplocale
  30
  31 locale_t
  32 rpl_duplocale (locale_t locale)
  33 {
  34   /* Work around crash in the duplocale function in glibc < 2.12.
  35      See <http://sourceware.org/bugzilla/show_bug.cgi?id=10969>.  */
  36   if (locale == LC_GLOBAL_LOCALE)
  37     {
  38       /* Create a copy of the locale by fetching the name of each locale
  39          category, starting with LC_CTYPE.  */
  40       static struct { int cat; int mask; } const categories[] =
  41         {
  42             { LC_NUMERIC,        LC_NUMERIC_MASK },
  43             { LC_TIME,           LC_TIME_MASK },
  44             { LC_COLLATE,        LC_COLLATE_MASK },
  45             { LC_MONETARY,       LC_MONETARY_MASK },
  46             { LC_MESSAGES,       LC_MESSAGES_MASK }
  47 #ifdef LC_PAPER
  48           , { LC_PAPER,          LC_PAPER_MASK }
  49 #endif
  50 #ifdef LC_NAME
  51           , { LC_NAME,           LC_NAME_MASK }
  52 #endif
  53 #ifdef LC_ADDRESS
  54           , { LC_ADDRESS,        LC_ADDRESS_MASK }
  55 #endif
  56 #ifdef LC_TELEPHONE
  57           , { LC_TELEPHONE,      LC_TELEPHONE_MASK }
  58 #endif
  59 #ifdef LC_MEASUREMENT
  60           , { LC_MEASUREMENT,    LC_MEASUREMENT_MASK }
  61 #endif
  62 #ifdef LC_IDENTIFICATION
  63           , { LC_IDENTIFICATION, LC_IDENTIFICATION_MASK }
  64 #endif
  65         };
  66       const char *base_name;
  67       locale_t base_copy;
  68       unsigned int i;
  69
  70       base_name = setlocale (LC_CTYPE, NULL);
  71       base_copy = newlocale (LC_ALL_MASK, base_name, NULL);
  72       if (base_copy == NULL)
  73         return NULL;
  74
  75       for (i = 0; i < SIZEOF (categories); i++)
  76         {
  77           int category = categories[i].cat;
  78           int category_mask = categories[i].mask;
  79           const char *name = setlocale (category, NULL);
  80           if (strcmp (name, base_name) != 0)
  81             {
  82               locale_t copy = newlocale (category_mask, name, base_copy);
  83               if (copy == NULL)
  84                 {
  85                   int saved_errno = errno;
  86                   freelocale (base_copy);
  87                   errno = saved_errno;
  88                   return NULL;
  89                 }
  90               /* No need to call freelocale (base_copy) if copy != base_copy;
  91                  the newlocale function already takes care of doing it.  */
  92               base_copy = copy;
  93             }
  94         }
  95
  96       return base_copy;
  97     }
  98
  99   return duplocale (locale);
 100 }