locale/nl_langinfo_l.c

   1 /* User interface for extracting locale-dependent parameters.
   2    Copyright (C) 1995-2021 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <langinfo.h>
  20 #include <locale.h>
  21 #include <errno.h>
  22 #include <stddef.h>
  23 #include <stdlib.h>
  24 #include "localeinfo.h"
  25
  26
  27 /* Return a string with the data for locale-dependent parameter ITEM.  */
  28
  29 char *
  30 __nl_langinfo_l (nl_item item, locale_t l)
  31 {
  32   int category = _NL_ITEM_CATEGORY (item);
  33   unsigned int index = _NL_ITEM_INDEX (item);
  34   const struct __locale_data *data;
  35
  36   if (category < 0 || category == LC_ALL || category >= __LC_LAST)
  37     /* Bogus category: bogus item.  */
  38     return (char *) "";
  39
  40   /* Special case value for NL_LOCALE_NAME (category).
  41      This is not a real item index in the string table.  */
  42   if (index == _NL_ITEM_INDEX (_NL_LOCALE_NAME (category)))
  43     return (char *) l->__names[category];
  44
  45 #if defined NL_CURRENT_INDIRECT
  46   /* Make direct reference to every _nl_current_CATEGORY symbol,
  47      since we know only at runtime which categories are used.  */
  48   switch (category)
  49     {
  50 # define DEFINE_CATEGORY(category, category_name, items, a) \
  51       case category: data = *_nl_current_##category; break;
  52 # include "categories.def"
  53 # undef DEFINE_CATEGORY
  54     default:                   /* Should be impossible.  */
  55       abort();
  56     }
  57 #else
  58   data = l->__locales[category];
  59 #endif
  60
  61   if (index >= data->nstrings)
  62     /* Bogus index for this category: bogus item.  */
  63     return (char *) "";
  64
  65   /* Return the string for the specified item.  */
  66   return (char *) data->values[index].string;
  67 }
  68 libc_hidden_def (__nl_langinfo_l)
  69 weak_alias (__nl_langinfo_l, nl_langinfo_l)