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glibc  2.9
Defines | Functions | Variables
findlocale.c File Reference
#include <assert.h>
#include <locale.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "localeinfo.h"
#include "../iconv/gconv_charset.h"
#include "../iconv/gconv_int.h"

Go to the source code of this file.

Defines

#define _nl_C   (_nl_C_locobj.__locales)

Functions

struct locale_data
*internal_function 
_nl_find_locale (const char *locale_path, size_t locale_path_len, int category, const char **name)
void internal_function _nl_remove_locale (int locale, struct locale_data *data)

Variables

struct loaded_l10nfile_nl_locale_file_list [__LC_LAST]
const char
_nl_default_locale_path[] 
attribute_hidden = LOCALEDIR

Define Documentation

#define _nl_C   (_nl_C_locobj.__locales)

Definition at line 51 of file findlocale.c.


Function Documentation

struct locale_data* internal_function _nl_find_locale ( const char *  locale_path,
size_t  locale_path_len,
int  category,
const char **  name 
) [read]

Definition at line 64 of file findlocale.c.

{
  int mask;
  /* Name of the locale for this category.  */
  char *loc_name;
  const char *language;
  const char *modifier;
  const char *territory;
  const char *codeset;
  const char *normalized_codeset;
  struct loaded_l10nfile *locale_file;

  if ((*name)[0] == '\0')
    {
      /* The user decides which locale to use by setting environment
        variables.  */
      *name = getenv ("LC_ALL");
      if (*name == NULL || (*name)[0] == '\0')
       *name = getenv (_nl_category_names.str
                     + _nl_category_name_idxs[category]);
      if (*name == NULL || (*name)[0] == '\0')
       *name = getenv ("LANG");
    }

  if (*name == NULL || (*name)[0] == '\0'
      || (__builtin_expect (__libc_enable_secure, 0)
         && strchr (*name, '/') != NULL))
    *name = (char *) _nl_C_name;

  if (__builtin_expect (strcmp (*name, _nl_C_name), 1) == 0
      || __builtin_expect (strcmp (*name, _nl_POSIX_name), 1) == 0)
    {
      /* We need not load anything.  The needed data is contained in
        the library itself.  */
      *name = (char *) _nl_C_name;
      return _nl_C[category];
    }

  /* We really have to load some data.  First we try the archive,
     but only if there was no LOCPATH environment variable specified.  */
  if (__builtin_expect (locale_path == NULL, 1))
    {
      struct locale_data *data = _nl_load_locale_from_archive (category, name);
      if (__builtin_expect (data != NULL, 1))
       return data;

      /* Nothing in the archive.  Set the default path to search below.  */
      locale_path = _nl_default_locale_path;
      locale_path_len = sizeof _nl_default_locale_path;
    }

  /* We really have to load some data.  First see whether the name is
     an alias.  Please note that this makes it impossible to have "C"
     or "POSIX" as aliases.  */
  loc_name = (char *) _nl_expand_alias (*name);
  if (loc_name == NULL)
    /* It is no alias.  */
    loc_name = (char *) *name;

  /* Make a writable copy of the locale name.  */
  loc_name = strdupa (loc_name);

  /* LOCALE can consist of up to four recognized parts for the XPG syntax:

              language[_territory[.codeset]][@modifier]

     Beside the first all of them are allowed to be missing.  If the
     full specified locale is not found, the less specific one are
     looked for.  The various part will be stripped off according to
     the following order:
              (1) codeset
              (2) normalized codeset
              (3) territory
              (4) modifier
   */
  mask = _nl_explode_name (loc_name, &language, &modifier, &territory,
                        &codeset, &normalized_codeset);

  /* If exactly this locale was already asked for we have an entry with
     the complete name.  */
  locale_file = _nl_make_l10nflist (&_nl_locale_file_list[category],
                                locale_path, locale_path_len, mask,
                                language, territory, codeset,
                                normalized_codeset, modifier,
                                _nl_category_names.str
                                + _nl_category_name_idxs[category], 0);

  if (locale_file == NULL)
    {
      /* Find status record for addressed locale file.  We have to search
        through all directories in the locale path.  */
      locale_file = _nl_make_l10nflist (&_nl_locale_file_list[category],
                                   locale_path, locale_path_len, mask,
                                   language, territory, codeset,
                                   normalized_codeset, modifier,
                                   _nl_category_names.str
                                   + _nl_category_name_idxs[category], 1);
      if (locale_file == NULL)
       /* This means we are out of core.  */
       return NULL;
    }

  /* The space for normalized_codeset is dynamically allocated.  Free it.  */
  if (mask & XPG_NORM_CODESET)
    free ((void *) normalized_codeset);

  if (locale_file->decided == 0)
    _nl_load_locale (locale_file, category);

  if (locale_file->data == NULL)
    {
      int cnt;
      for (cnt = 0; locale_file->successor[cnt] != NULL; ++cnt)
       {
         if (locale_file->successor[cnt]->decided == 0)
           _nl_load_locale (locale_file->successor[cnt], category);
         if (locale_file->successor[cnt]->data != NULL)
           break;
       }
      /* Move the entry we found (or NULL) to the first place of
        successors.  */
      locale_file->successor[0] = locale_file->successor[cnt];
      locale_file = locale_file->successor[cnt];

      if (locale_file == NULL)
       return NULL;
    }

  /* The LC_CTYPE category allows to check whether a locale is really
     usable.  If the locale name contains a charset name and the
     charset name used in the locale (present in the LC_CTYPE data) is
     not the same (after resolving aliases etc) we reject the locale
     since using it would irritate users expecting the charset named
     in the locale name.  */
  if (codeset != NULL)
    {
      /* Get the codeset information from the locale file.  */
      static const int codeset_idx[] =
       {
         [__LC_CTYPE] = _NL_ITEM_INDEX (CODESET),
         [__LC_NUMERIC] = _NL_ITEM_INDEX (_NL_NUMERIC_CODESET),
         [__LC_TIME] = _NL_ITEM_INDEX (_NL_TIME_CODESET),
         [__LC_COLLATE] = _NL_ITEM_INDEX (_NL_COLLATE_CODESET),
         [__LC_MONETARY] = _NL_ITEM_INDEX (_NL_MONETARY_CODESET),
         [__LC_MESSAGES] = _NL_ITEM_INDEX (_NL_MESSAGES_CODESET),
         [__LC_PAPER] = _NL_ITEM_INDEX (_NL_PAPER_CODESET),
         [__LC_NAME] = _NL_ITEM_INDEX (_NL_NAME_CODESET),
         [__LC_ADDRESS] = _NL_ITEM_INDEX (_NL_ADDRESS_CODESET),
         [__LC_TELEPHONE] = _NL_ITEM_INDEX (_NL_TELEPHONE_CODESET),
         [__LC_MEASUREMENT] = _NL_ITEM_INDEX (_NL_MEASUREMENT_CODESET),
         [__LC_IDENTIFICATION] = _NL_ITEM_INDEX (_NL_IDENTIFICATION_CODESET)
       };
      const struct locale_data *data;
      const char *locale_codeset;
      char *clocale_codeset;
      char *ccodeset;

      data = (const struct locale_data *) locale_file->data;
      locale_codeset =
       (const char *) data->values[codeset_idx[category]].string;
      assert (locale_codeset != NULL);
      /* Note the length of the allocated memory: +3 for up to two slashes
        and the NUL byte.  */
      clocale_codeset = (char *) alloca (strlen (locale_codeset) + 3);
      strip (clocale_codeset, locale_codeset);

      ccodeset = (char *) alloca (strlen (codeset) + 3);
      strip (ccodeset, codeset);

      if (__gconv_compare_alias (upstr (ccodeset, ccodeset),
                             upstr (clocale_codeset,
                                   clocale_codeset)) != 0)
       /* The codesets are not identical, don't use the locale.  */
       return NULL;
    }

  /* Determine the locale name for which loading succeeded.  This
     information comes from the file name.  The form is
     <path>/<locale>/LC_foo.  We must extract the <locale> part.  */
  if (((const struct locale_data *) locale_file->data)->name == NULL)
    {
      char *cp, *endp;

      endp = strrchr (locale_file->filename, '/');
      cp = endp - 1;
      while (cp[-1] != '/')
       --cp;
      ((struct locale_data *) locale_file->data)->name = __strndup (cp,
                                                            endp - cp);
    }

  /* Determine whether the user wants transliteration or not.  */
  if (modifier != NULL && __strcasecmp (modifier, "TRANSLIT") == 0)
    ((struct locale_data *) locale_file->data)->use_translit = 1;

  /* Increment the usage count.  */
  if (((const struct locale_data *) locale_file->data)->usage_count
      < MAX_USAGE_COUNT)
    ++((struct locale_data *) locale_file->data)->usage_count;

  return (struct locale_data *) locale_file->data;
}

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void internal_function _nl_remove_locale ( int  locale,
struct locale_data data 
)

Definition at line 273 of file findlocale.c.

{
  if (--data->usage_count == 0)
    {
      if (data->alloc != ld_archive)
       {
         /* First search the entry in the list of loaded files.  */
         struct loaded_l10nfile *ptr = _nl_locale_file_list[locale];

         /* Search for the entry.  It must be in the list.  Otherwise it
            is a bug and we crash badly.  */
         while ((struct locale_data *) ptr->data != data)
           ptr = ptr->next;

         /* Mark the data as not available anymore.  So when the data has
            to be used again it is reloaded.  */
         ptr->decided = 0;
         ptr->data = NULL;
       }

      /* This does the real work.  */
      _nl_unload_locale (data);
    }
}

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Variable Documentation

Definition at line 57 of file findlocale.c.

const char _nl_default_locale_path [] attribute_hidden = LOCALEDIR

Definition at line 59 of file findlocale.c.