/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <alloca.h>
#include <argz.h>
#include <errno.h>
#include <libc-lock.h>
#include <locale.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "localeinfo.h"
#ifdef NL_CURRENT_INDIRECT
/* For each category declare a special external symbol
_nl_current_CATEGORY_used with a weak reference.
This symbol will is defined in lc-CATEGORY.c and will be linked in
if anything uses _nl_current_CATEGORY (also defined in that module).
Also use a weak reference for the _nl_current_CATEGORY thread variable. */
# define DEFINE_CATEGORY(category, category_name, items, a) \
extern char _nl_current_##category##_used; \
weak_extern (_nl_current_##category##_used) \
weak_extern (_nl_current_##category)
# include "categories.def"
# undef DEFINE_CATEGORY
/* Now define a table of flags based on those special weak symbols' values.
_nl_current_used[CATEGORY] will be zero if _nl_current_CATEGORY is not
linked in. */
static char *const _nl_current_used[] =
{
# define DEFINE_CATEGORY(category, category_name, items, a) \
[category] = &_nl_current_##category##_used,
# include "categories.def"
# undef DEFINE_CATEGORY
};
# define CATEGORY_USED(category) (_nl_current_used[category] != 0)
#else
/* The shared library always loads all the categories,
and the current global settings are kept in _nl_global_locale. */
# define CATEGORY_USED(category) (1)
#endif
/* Define an array of category names (also the environment variable names). */
const union catnamestr_t _nl_category_names attribute_hidden =
{
{
#define DEFINE_CATEGORY(category, category_name, items, a) \
category_name,
#include "categories.def"
#undef DEFINE_CATEGORY
}
};
const uint8_t _nl_category_name_idxs[__LC_LAST] attribute_hidden =
{
#define DEFINE_CATEGORY(category, category_name, items, a) \
[category] = offsetof (union catnamestr_t, CATNAMEMF (__LINE__)),
#include "categories.def"
#undef DEFINE_CATEGORY
};
/* An array of their lengths, for convenience. */
const uint8_t _nl_category_name_sizes[] attribute_hidden =
{
#define DEFINE_CATEGORY(category, category_name, items, a) \
[category] = sizeof (category_name) - 1,
#include "categories.def"
#undef DEFINE_CATEGORY
[LC_ALL] = sizeof ("LC_ALL") - 1
};
#ifdef NL_CURRENT_INDIRECT
# define WEAK_POSTLOAD(postload) weak_extern (postload)
#else
# define WEAK_POSTLOAD(postload) /* Need strong refs in static linking. */
#endif
/* Declare the postload functions used below. */
#undef NO_POSTLOAD
#define NO_POSTLOAD _nl_postload_ctype /* Harmless thing known to exist. */
#define DEFINE_CATEGORY(category, category_name, items, postload) \
extern void postload (void); WEAK_POSTLOAD (postload)
#include "categories.def"
#undef DEFINE_CATEGORY
#undef NO_POSTLOAD
/* Define an array indexed by category of postload functions to call after
loading and installing that category's data. */
static void (*const _nl_category_postload[]) (void) =
{
#define DEFINE_CATEGORY(category, category_name, items, postload) \
[category] = postload,
#include "categories.def"
#undef DEFINE_CATEGORY
};
/* Lock for protecting global data. */
__libc_rwlock_define_initialized (, __libc_setlocale_lock attribute_hidden)
/* Defined in loadmsgcat.c. */
extern int _nl_msg_cat_cntr;
/* Use this when we come along an error. */
#define ERROR_RETURN \
do { \
__set_errno (EINVAL); \
return NULL; \
} while (0)
/* Construct a new composite name. */
static char *
new_composite_name (int category, const char *newnames[__LC_LAST])
{
size_t last_len = 0;
size_t cumlen = 0;
int i;
char *new, *p;
int same = 1;
for (i = 0; i < __LC_LAST; ++i)
if (i != LC_ALL)
{
const char *name = (category == LC_ALL ? newnames[i] :
category == i ? newnames[0] :
_nl_global_locale.__names[i]);
last_len = strlen (name);
cumlen += _nl_category_name_sizes[i] + 1 + last_len + 1;
if (same && name != newnames[0] && strcmp (name, newnames[0]) != 0)
same = 0;
}
if (same)
{
/* All the categories use the same name. */
if (strcmp (newnames[0], _nl_C_name) == 0
|| strcmp (newnames[0], _nl_POSIX_name) == 0)
return (char *) _nl_C_name;
new = malloc (last_len + 1);
return new == NULL ? NULL : memcpy (new, newnames[0], last_len + 1);
}
new = malloc (cumlen);
if (new == NULL)
return NULL;
p = new;
for (i = 0; i < __LC_LAST; ++i)
if (i != LC_ALL)
{
/* Add "CATEGORY=NAME;" to the string. */
const char *name = (category == LC_ALL ? newnames[i] :
category == i ? newnames[0] :
_nl_global_locale.__names[i]);
p = __stpcpy (p, _nl_category_names.str + _nl_category_name_idxs[i]);
*p++ = '=';
p = __stpcpy (p, name);
*p++ = ';';
}
p[-1] = '\0'; /* Clobber the last ';'. */
return new;
}
/* Put NAME in _nl_global_locale.__names. */
static void
setname (int category, const char *name)
{
if (_nl_global_locale.__names[category] == name)
return;
if (_nl_global_locale.__names[category] != _nl_C_name)
free ((char *) _nl_global_locale.__names[category]);
_nl_global_locale.__names[category] = name;
}
/* Put DATA in *_nl_current[CATEGORY]. */
static void
setdata (int category, struct __locale_data *data)
{
if (CATEGORY_USED (category))
{
_nl_global_locale.__locales[category] = data;
if (_nl_category_postload[category])
(*_nl_category_postload[category]) ();
}
}
char *
setlocale (int category, const char *locale)
{
char *locale_path;
size_t locale_path_len;
const char *locpath_var;
char *composite;
/* Sanity check for CATEGORY argument. */
if (__builtin_expect (category, 0) < 0
|| __builtin_expect (category, 0) >= __LC_LAST)
ERROR_RETURN;
/* Does user want name of current locale? */
if (locale == NULL)
return (char *) _nl_global_locale.__names[category];
/* Protect global data. */
__libc_rwlock_wrlock (__libc_setlocale_lock);
if (strcmp (locale, _nl_global_locale.__names[category]) == 0)
{
/* Changing to the same thing. */
__libc_rwlock_unlock (__libc_setlocale_lock);
return (char *) _nl_global_locale.__names[category];
}
/* We perhaps really have to load some data. So we determine the
path in which to look for the data now. The environment variable
`LOCPATH' must only be used when the binary has no SUID or SGID
bit set. If using the default path, we tell _nl_find_locale
by passing null and it can check the canonical locale archive. */
locale_path = NULL;
locale_path_len = 0;
locpath_var = getenv ("LOCPATH");
if (locpath_var != NULL && locpath_var[0] != '\0')
{
if (__argz_create_sep (locpath_var, ':',
&locale_path, &locale_path_len) != 0
|| __argz_add_sep (&locale_path, &locale_path_len,
_nl_default_locale_path, ':') != 0)
{
__libc_rwlock_unlock (__libc_setlocale_lock);
return NULL;
}
}
if (category == LC_ALL)
{
/* The user wants to set all categories. The desired locales
for the individual categories can be selected by using a
composite locale name. This is a semi-colon separated list
of entries of the form `CATEGORY=VALUE'. */
const char *newnames[__LC_LAST];
struct __locale_data *newdata[__LC_LAST];
/* Copy of the locale argument, for in-place splitting. */
char *locale_copy = NULL;
/* Set all name pointers to the argument name. */
for (category = 0; category < __LC_LAST; ++category)
if (category != LC_ALL)
newnames[category] = (char *) locale;
if (__glibc_unlikely (strchr (locale, ';') != NULL))
{
/* This is a composite name. Make a copy and split it up. */
locale_copy = __strdup (locale);
if (__glibc_unlikely (locale_copy == NULL))
{
__libc_rwlock_unlock (__libc_setlocale_lock);
return NULL;
}
char *np = locale_copy;
char *cp;
int cnt;
while ((cp = strchr (np, '=')) != NULL)
{
for (cnt = 0; cnt < __LC_LAST; ++cnt)
if (cnt != LC_ALL
&& (size_t) (cp - np) == _nl_category_name_sizes[cnt]
&& (memcmp (np, (_nl_category_names.str
+ _nl_category_name_idxs[cnt]), cp - np)
== 0))
break;
if (cnt == __LC_LAST)
{
error_return:
__libc_rwlock_unlock (__libc_setlocale_lock);
free (locale_copy);
/* Bogus category name. */
ERROR_RETURN;
}
/* Found the category this clause sets. */
newnames[cnt] = ++cp;
cp = strchr (cp, ';');
if (cp != NULL)
{
/* Examine the next clause. */
*cp = '\0';
np = cp + 1;
}
else
/* This was the last clause. We are done. */
break;
}
for (cnt = 0; cnt < __LC_LAST; ++cnt)
if (cnt != LC_ALL && newnames[cnt] == locale)
/* The composite name did not specify all categories. */
goto error_return;
}
/* Load the new data for each category. */
while (category-- > 0)
if (category != LC_ALL)
{
newdata[category] = _nl_find_locale (locale_path, locale_path_len,
category,
&newnames[category]);
if (newdata[category] == NULL)
{
#ifdef NL_CURRENT_INDIRECT
if (newnames[category] == _nl_C_name)
/* Null because it's the weak value of _nl_C_LC_FOO. */
continue;
#endif
break;
}
/* We must not simply free a global locale since we have
no control over the usage. So we mark it as
un-deletable. And yes, the 'if' is needed, the data
might be in read-only memory. */
if (newdata[category]->usage_count != UNDELETABLE)
newdata[category]->usage_count = UNDELETABLE;
/* Make a copy of locale name. */
if (newnames[category] != _nl_C_name)
{
if (strcmp (newnames[category],
_nl_global_locale.__names[category]) == 0)
newnames[category] = _nl_global_locale.__names[category];
else
{
newnames[category] = __strdup (newnames[category]);
if (newnames[category] == NULL)
break;
}
}
}
/* Create new composite name. */
composite = (category >= 0
? NULL : new_composite_name (LC_ALL, newnames));
if (composite != NULL)
{
/* Now we have loaded all the new data. Put it in place. */
for (category = 0; category < __LC_LAST; ++category)
if (category != LC_ALL)
{
setdata (category, newdata[category]);
setname (category, newnames[category]);
}
setname (LC_ALL, composite);
/* We successfully loaded a new locale. Let the message catalog
functions know about this. */
++_nl_msg_cat_cntr;
}
else
for (++category; category < __LC_LAST; ++category)
if (category != LC_ALL && newnames[category] != _nl_C_name
&& newnames[category] != _nl_global_locale.__names[category])
free ((char *) newnames[category]);
/* Critical section left. */
__libc_rwlock_unlock (__libc_setlocale_lock);
/* Free the resources. */
free (locale_path);
free (locale_copy);
return composite;
}
else
{
struct __locale_data *newdata = NULL;
const char *newname[1] = { locale };
if (CATEGORY_USED (category))
{
/* Only actually load the data if anything will use it. */
newdata = _nl_find_locale (locale_path, locale_path_len, category,
&newname[0]);
if (newdata == NULL)
goto abort_single;
/* We must not simply free a global locale since we have no
control over the usage. So we mark it as un-deletable.
Note: do not remove the `if', it's necessary to cope with
the builtin locale data. */
if (newdata->usage_count != UNDELETABLE)
newdata->usage_count = UNDELETABLE;
}
/* Make a copy of locale name. */
if (newname[0] != _nl_C_name)
{
newname[0] = __strdup (newname[0]);
if (newname[0] == NULL)
goto abort_single;
}
/* Create new composite name. */
composite = new_composite_name (category, newname);
if (composite == NULL)
{
if (newname[0] != _nl_C_name)
free ((char *) newname[0]);
/* Say that we don't have any data loaded. */
abort_single:
newname[0] = NULL;
}
else
{
if (CATEGORY_USED (category))
setdata (category, newdata);
setname (category, newname[0]);
setname (LC_ALL, composite);
/* We successfully loaded a new locale. Let the message catalog
functions know about this. */
++_nl_msg_cat_cntr;
}
/* Critical section left. */
__libc_rwlock_unlock (__libc_setlocale_lock);
/* Free the resources (the locale path variable. */
free (locale_path);
return (char *) newname[0];
}
}
libc_hidden_def (setlocale)
static void __libc_freeres_fn_section
free_category (int category,
struct __locale_data *here, struct __locale_data *c_data)
{
struct loaded_l10nfile *runp = _nl_locale_file_list[category];
/* If this category is already "C" don't do anything. */
if (here != c_data)
{
/* We have to be prepared that sometime later we still
might need the locale information. */
setdata (category, c_data);
setname (category, _nl_C_name);
}
while (runp != NULL)
{
struct loaded_l10nfile *curr = runp;
struct __locale_data *data = (struct __locale_data *) runp->data;
if (data != NULL && data != c_data)
_nl_unload_locale (data);
runp = runp->next;
free ((char *) curr->filename);
free (curr);
}
}
/* This is called from iconv/gconv_db.c's free_mem, as locales must
be freed before freeing gconv steps arrays. */
void __libc_freeres_fn_section
_nl_locale_subfreeres (void)
{
#ifdef NL_CURRENT_INDIRECT
/* We don't use the loop because we want to have individual weak
symbol references here. */
# define DEFINE_CATEGORY(category, category_name, items, a) \
if (CATEGORY_USED (category)) \
{ \
extern struct __locale_data _nl_C_##category; \
weak_extern (_nl_C_##category) \
free_category (category, *_nl_current_##category, &_nl_C_##category); \
}
# include "categories.def"
# undef DEFINE_CATEGORY
#else
int category;
for (category = 0; category < __LC_LAST; ++category)
if (category != LC_ALL)
free_category (category, _NL_CURRENT_DATA (category),
_nl_C_locobj.__locales[category]);
#endif
setname (LC_ALL, _nl_C_name);
/* This frees the data structures associated with the locale archive.
The locales from the archive are not in the file list, so we have
not called _nl_unload_locale on them above. */
_nl_archive_subfreeres ();
}