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525 lines
15 KiB
C
525 lines
15 KiB
C
/* Copyright (C) 1991-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <alloca.h>
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#include <argz.h>
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#include <errno.h>
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#include <bits/libc-lock.h>
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#include <locale.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "localeinfo.h"
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#ifdef NL_CURRENT_INDIRECT
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/* For each category declare a special external symbol
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_nl_current_CATEGORY_used with a weak reference.
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This symbol will is defined in lc-CATEGORY.c and will be linked in
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if anything uses _nl_current_CATEGORY (also defined in that module).
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Also use a weak reference for the _nl_current_CATEGORY thread variable. */
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# define DEFINE_CATEGORY(category, category_name, items, a) \
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extern char _nl_current_##category##_used; \
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weak_extern (_nl_current_##category##_used) \
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weak_extern (_nl_current_##category)
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# include "categories.def"
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# undef DEFINE_CATEGORY
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/* Now define a table of flags based on those special weak symbols' values.
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_nl_current_used[CATEGORY] will be zero if _nl_current_CATEGORY is not
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linked in. */
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static char *const _nl_current_used[] =
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{
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# define DEFINE_CATEGORY(category, category_name, items, a) \
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[category] = &_nl_current_##category##_used,
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# include "categories.def"
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# undef DEFINE_CATEGORY
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};
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# define CATEGORY_USED(category) (_nl_current_used[category] != 0)
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#else
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/* The shared library always loads all the categories,
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and the current global settings are kept in _nl_global_locale. */
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# define CATEGORY_USED(category) (1)
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#endif
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/* Define an array of category names (also the environment variable names). */
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const union catnamestr_t _nl_category_names attribute_hidden =
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{
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{
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#define DEFINE_CATEGORY(category, category_name, items, a) \
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category_name,
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#include "categories.def"
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#undef DEFINE_CATEGORY
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}
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};
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const uint8_t _nl_category_name_idxs[__LC_LAST] attribute_hidden =
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{
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#define DEFINE_CATEGORY(category, category_name, items, a) \
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[category] = offsetof (union catnamestr_t, CATNAMEMF (__LINE__)),
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#include "categories.def"
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#undef DEFINE_CATEGORY
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};
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/* An array of their lengths, for convenience. */
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const uint8_t _nl_category_name_sizes[] attribute_hidden =
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{
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#define DEFINE_CATEGORY(category, category_name, items, a) \
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[category] = sizeof (category_name) - 1,
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#include "categories.def"
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#undef DEFINE_CATEGORY
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[LC_ALL] = sizeof ("LC_ALL") - 1
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};
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#ifdef NL_CURRENT_INDIRECT
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# define WEAK_POSTLOAD(postload) weak_extern (postload)
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#else
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# define WEAK_POSTLOAD(postload) /* Need strong refs in static linking. */
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#endif
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/* Declare the postload functions used below. */
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#undef NO_POSTLOAD
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#define NO_POSTLOAD _nl_postload_ctype /* Harmless thing known to exist. */
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#define DEFINE_CATEGORY(category, category_name, items, postload) \
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extern void postload (void); WEAK_POSTLOAD (postload)
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#include "categories.def"
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#undef DEFINE_CATEGORY
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#undef NO_POSTLOAD
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/* Define an array indexed by category of postload functions to call after
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loading and installing that category's data. */
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static void (*const _nl_category_postload[]) (void) =
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{
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#define DEFINE_CATEGORY(category, category_name, items, postload) \
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[category] = postload,
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#include "categories.def"
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#undef DEFINE_CATEGORY
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};
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/* Lock for protecting global data. */
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__libc_rwlock_define_initialized (, __libc_setlocale_lock attribute_hidden)
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/* Defined in loadmsgcat.c. */
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extern int _nl_msg_cat_cntr;
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/* Use this when we come along an error. */
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#define ERROR_RETURN \
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do { \
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__set_errno (EINVAL); \
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return NULL; \
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} while (0)
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/* Construct a new composite name. */
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static char *
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new_composite_name (int category, const char *newnames[__LC_LAST])
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{
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size_t last_len = 0;
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size_t cumlen = 0;
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int i;
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char *new, *p;
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int same = 1;
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for (i = 0; i < __LC_LAST; ++i)
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if (i != LC_ALL)
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{
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const char *name = (category == LC_ALL ? newnames[i] :
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category == i ? newnames[0] :
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_nl_global_locale.__names[i]);
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last_len = strlen (name);
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cumlen += _nl_category_name_sizes[i] + 1 + last_len + 1;
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if (same && name != newnames[0] && strcmp (name, newnames[0]) != 0)
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same = 0;
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}
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if (same)
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{
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/* All the categories use the same name. */
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if (strcmp (newnames[0], _nl_C_name) == 0
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|| strcmp (newnames[0], _nl_POSIX_name) == 0)
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return (char *) _nl_C_name;
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new = malloc (last_len + 1);
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return new == NULL ? NULL : memcpy (new, newnames[0], last_len + 1);
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}
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new = malloc (cumlen);
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if (new == NULL)
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return NULL;
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p = new;
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for (i = 0; i < __LC_LAST; ++i)
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if (i != LC_ALL)
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{
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/* Add "CATEGORY=NAME;" to the string. */
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const char *name = (category == LC_ALL ? newnames[i] :
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category == i ? newnames[0] :
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_nl_global_locale.__names[i]);
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p = __stpcpy (p, _nl_category_names.str + _nl_category_name_idxs[i]);
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*p++ = '=';
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p = __stpcpy (p, name);
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*p++ = ';';
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}
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p[-1] = '\0'; /* Clobber the last ';'. */
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return new;
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}
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/* Put NAME in _nl_global_locale.__names. */
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static void
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setname (int category, const char *name)
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{
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if (_nl_global_locale.__names[category] == name)
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return;
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if (_nl_global_locale.__names[category] != _nl_C_name)
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free ((char *) _nl_global_locale.__names[category]);
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_nl_global_locale.__names[category] = name;
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}
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/* Put DATA in *_nl_current[CATEGORY]. */
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static void
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setdata (int category, struct __locale_data *data)
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{
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if (CATEGORY_USED (category))
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{
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_nl_global_locale.__locales[category] = data;
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if (_nl_category_postload[category])
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(*_nl_category_postload[category]) ();
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}
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}
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char *
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setlocale (int category, const char *locale)
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{
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char *locale_path;
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size_t locale_path_len;
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const char *locpath_var;
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char *composite;
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/* Sanity check for CATEGORY argument. */
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if (__builtin_expect (category, 0) < 0
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|| __builtin_expect (category, 0) >= __LC_LAST)
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ERROR_RETURN;
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/* Does user want name of current locale? */
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if (locale == NULL)
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return (char *) _nl_global_locale.__names[category];
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/* Protect global data. */
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__libc_rwlock_wrlock (__libc_setlocale_lock);
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if (strcmp (locale, _nl_global_locale.__names[category]) == 0)
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{
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/* Changing to the same thing. */
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__libc_rwlock_unlock (__libc_setlocale_lock);
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return (char *) _nl_global_locale.__names[category];
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}
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/* We perhaps really have to load some data. So we determine the
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path in which to look for the data now. The environment variable
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`LOCPATH' must only be used when the binary has no SUID or SGID
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bit set. If using the default path, we tell _nl_find_locale
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by passing null and it can check the canonical locale archive. */
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locale_path = NULL;
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locale_path_len = 0;
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locpath_var = getenv ("LOCPATH");
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if (locpath_var != NULL && locpath_var[0] != '\0')
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{
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if (__argz_create_sep (locpath_var, ':',
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&locale_path, &locale_path_len) != 0
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|| __argz_add_sep (&locale_path, &locale_path_len,
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_nl_default_locale_path, ':') != 0)
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{
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__libc_rwlock_unlock (__libc_setlocale_lock);
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return NULL;
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}
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}
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if (category == LC_ALL)
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{
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/* The user wants to set all categories. The desired locales
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for the individual categories can be selected by using a
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composite locale name. This is a semi-colon separated list
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of entries of the form `CATEGORY=VALUE'. */
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const char *newnames[__LC_LAST];
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struct __locale_data *newdata[__LC_LAST];
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/* Set all name pointers to the argument name. */
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for (category = 0; category < __LC_LAST; ++category)
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if (category != LC_ALL)
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newnames[category] = (char *) locale;
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if (__glibc_unlikely (strchr (locale, ';') != NULL))
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{
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/* This is a composite name. Make a copy and split it up. */
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char *np = strdupa (locale);
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char *cp;
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int cnt;
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while ((cp = strchr (np, '=')) != NULL)
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{
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for (cnt = 0; cnt < __LC_LAST; ++cnt)
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if (cnt != LC_ALL
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&& (size_t) (cp - np) == _nl_category_name_sizes[cnt]
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&& (memcmp (np, (_nl_category_names.str
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+ _nl_category_name_idxs[cnt]), cp - np)
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== 0))
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break;
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if (cnt == __LC_LAST)
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{
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error_return:
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__libc_rwlock_unlock (__libc_setlocale_lock);
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/* Bogus category name. */
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ERROR_RETURN;
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}
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/* Found the category this clause sets. */
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newnames[cnt] = ++cp;
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cp = strchr (cp, ';');
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if (cp != NULL)
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{
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/* Examine the next clause. */
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*cp = '\0';
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np = cp + 1;
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}
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else
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/* This was the last clause. We are done. */
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break;
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}
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for (cnt = 0; cnt < __LC_LAST; ++cnt)
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if (cnt != LC_ALL && newnames[cnt] == locale)
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/* The composite name did not specify all categories. */
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goto error_return;
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}
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/* Load the new data for each category. */
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while (category-- > 0)
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if (category != LC_ALL)
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{
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newdata[category] = _nl_find_locale (locale_path, locale_path_len,
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category,
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&newnames[category]);
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if (newdata[category] == NULL)
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{
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#ifdef NL_CURRENT_INDIRECT
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if (newnames[category] == _nl_C_name)
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/* Null because it's the weak value of _nl_C_LC_FOO. */
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continue;
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#endif
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break;
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}
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/* We must not simply free a global locale since we have
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no control over the usage. So we mark it as
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un-deletable. And yes, the 'if' is needed, the data
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might be in read-only memory. */
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if (newdata[category]->usage_count != UNDELETABLE)
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newdata[category]->usage_count = UNDELETABLE;
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/* Make a copy of locale name. */
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if (newnames[category] != _nl_C_name)
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{
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if (strcmp (newnames[category],
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_nl_global_locale.__names[category]) == 0)
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newnames[category] = _nl_global_locale.__names[category];
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else
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{
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newnames[category] = __strdup (newnames[category]);
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if (newnames[category] == NULL)
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break;
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}
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}
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}
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/* Create new composite name. */
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composite = (category >= 0
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? NULL : new_composite_name (LC_ALL, newnames));
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if (composite != NULL)
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{
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/* Now we have loaded all the new data. Put it in place. */
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for (category = 0; category < __LC_LAST; ++category)
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if (category != LC_ALL)
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{
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setdata (category, newdata[category]);
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setname (category, newnames[category]);
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}
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setname (LC_ALL, composite);
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/* We successfully loaded a new locale. Let the message catalog
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functions know about this. */
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++_nl_msg_cat_cntr;
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}
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else
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for (++category; category < __LC_LAST; ++category)
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if (category != LC_ALL && newnames[category] != _nl_C_name
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&& newnames[category] != _nl_global_locale.__names[category])
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free ((char *) newnames[category]);
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/* Critical section left. */
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__libc_rwlock_unlock (__libc_setlocale_lock);
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/* Free the resources (the locale path variable). */
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free (locale_path);
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return composite;
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}
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else
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{
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struct __locale_data *newdata = NULL;
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const char *newname[1] = { locale };
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if (CATEGORY_USED (category))
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{
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/* Only actually load the data if anything will use it. */
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newdata = _nl_find_locale (locale_path, locale_path_len, category,
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&newname[0]);
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if (newdata == NULL)
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goto abort_single;
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/* We must not simply free a global locale since we have no
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control over the usage. So we mark it as un-deletable.
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Note: do not remove the `if', it's necessary to cope with
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the builtin locale data. */
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if (newdata->usage_count != UNDELETABLE)
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newdata->usage_count = UNDELETABLE;
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}
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/* Make a copy of locale name. */
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if (newname[0] != _nl_C_name)
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{
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newname[0] = __strdup (newname[0]);
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if (newname[0] == NULL)
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goto abort_single;
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}
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/* Create new composite name. */
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composite = new_composite_name (category, newname);
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if (composite == NULL)
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{
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if (newname[0] != _nl_C_name)
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free ((char *) newname[0]);
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/* Say that we don't have any data loaded. */
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abort_single:
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newname[0] = NULL;
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}
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else
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{
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if (CATEGORY_USED (category))
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setdata (category, newdata);
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setname (category, newname[0]);
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setname (LC_ALL, composite);
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/* We successfully loaded a new locale. Let the message catalog
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functions know about this. */
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++_nl_msg_cat_cntr;
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}
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/* Critical section left. */
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__libc_rwlock_unlock (__libc_setlocale_lock);
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/* Free the resources (the locale path variable. */
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free (locale_path);
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return (char *) newname[0];
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}
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}
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libc_hidden_def (setlocale)
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static void __libc_freeres_fn_section
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free_category (int category,
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struct __locale_data *here, struct __locale_data *c_data)
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{
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struct loaded_l10nfile *runp = _nl_locale_file_list[category];
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/* If this category is already "C" don't do anything. */
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if (here != c_data)
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{
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/* We have to be prepared that sometime later we still
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might need the locale information. */
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setdata (category, c_data);
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setname (category, _nl_C_name);
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}
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while (runp != NULL)
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{
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struct loaded_l10nfile *curr = runp;
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struct __locale_data *data = (struct __locale_data *) runp->data;
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if (data != NULL && data != c_data)
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_nl_unload_locale (data);
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runp = runp->next;
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free ((char *) curr->filename);
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free (curr);
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}
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}
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/* This is called from iconv/gconv_db.c's free_mem, as locales must
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be freed before freeing gconv steps arrays. */
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void __libc_freeres_fn_section
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_nl_locale_subfreeres (void)
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{
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#ifdef NL_CURRENT_INDIRECT
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/* We don't use the loop because we want to have individual weak
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symbol references here. */
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# define DEFINE_CATEGORY(category, category_name, items, a) \
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if (CATEGORY_USED (category)) \
|
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{ \
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extern struct __locale_data _nl_C_##category; \
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weak_extern (_nl_C_##category) \
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free_category (category, *_nl_current_##category, &_nl_C_##category); \
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}
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# include "categories.def"
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# undef DEFINE_CATEGORY
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#else
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int category;
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for (category = 0; category < __LC_LAST; ++category)
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if (category != LC_ALL)
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free_category (category, _NL_CURRENT_DATA (category),
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_nl_C_locobj.__locales[category]);
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#endif
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setname (LC_ALL, _nl_C_name);
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/* This frees the data structures associated with the locale archive.
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The locales from the archive are not in the file list, so we have
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not called _nl_unload_locale on them above. */
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_nl_archive_subfreeres ();
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}
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