lib/duplocale.c

   1 /* Duplicate a locale object.
   2    Copyright (C) 2009-2018 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 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 General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://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 <https://sourceware.org/bugzilla/show_bug.cgi?id=10969>.
  36      Also, on AIX 7.1, duplocale(LC_GLOBAL_LOCALE) returns (locale_t)0 with
  37      errno set to EINVAL.
  38      Also, on NetBSD 7.0, duplocale(LC_GLOBAL_LOCALE) returns a locale that
  39      corresponds to the C locale.  */
  40   if (locale == LC_GLOBAL_LOCALE)
  41     {
  42       /* Create a copy of the locale by fetching the name of each locale
  43          category, starting with LC_CTYPE.  */
  44       static struct { int cat; int mask; } const categories[] =
  45         {
  46             { LC_NUMERIC,        LC_NUMERIC_MASK },
  47             { LC_TIME,           LC_TIME_MASK },
  48             { LC_COLLATE,        LC_COLLATE_MASK },
  49             { LC_MONETARY,       LC_MONETARY_MASK },
  50             { LC_MESSAGES,       LC_MESSAGES_MASK }
  51 #ifdef LC_PAPER
  52           , { LC_PAPER,          LC_PAPER_MASK }
  53 #endif
  54 #ifdef LC_NAME
  55           , { LC_NAME,           LC_NAME_MASK }
  56 #endif
  57 #ifdef LC_ADDRESS
  58           , { LC_ADDRESS,        LC_ADDRESS_MASK }
  59 #endif
  60 #ifdef LC_TELEPHONE
  61           , { LC_TELEPHONE,      LC_TELEPHONE_MASK }
  62 #endif
  63 #ifdef LC_MEASUREMENT
  64           , { LC_MEASUREMENT,    LC_MEASUREMENT_MASK }
  65 #endif
  66 #ifdef LC_IDENTIFICATION
  67           , { LC_IDENTIFICATION, LC_IDENTIFICATION_MASK }
  68 #endif
  69         };
  70       const char *base_name;
  71       locale_t base_copy;
  72       unsigned int i;
  73
  74       base_name = setlocale (LC_CTYPE, NULL);
  75       base_copy = newlocale (LC_ALL_MASK, base_name, NULL);
  76       if (base_copy == NULL)
  77         return NULL;
  78
  79       for (i = 0; i < SIZEOF (categories); i++)
  80         {
  81           int category = categories[i].cat;
  82           int category_mask = categories[i].mask;
  83           const char *name = setlocale (category, NULL);
  84           if (strcmp (name, base_name) != 0)
  85             {
  86               locale_t copy = newlocale (category_mask, name, base_copy);
  87               if (copy == NULL)
  88                 {
  89                   int saved_errno = errno;
  90                   freelocale (base_copy);
  91                   errno = saved_errno;
  92                   return NULL;
  93                 }
  94               /* No need to call freelocale (base_copy) if copy != base_copy;
  95                  the newlocale function already takes care of doing it.  */
  96               base_copy = copy;
  97             }
  98         }
  99
 100       return base_copy;
 101     }
 102
 103   return duplocale (locale);
 104 }