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310 lines
8.2 KiB
C
310 lines
8.2 KiB
C
/* Functions to read locale data files.
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Copyright (C) 1996-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
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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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<https://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.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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#ifdef _POSIX_MAPPED_FILES
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# include <sys/mman.h>
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#endif
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#include <sys/stat.h>
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#include <not-cancel.h>
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#include "localeinfo.h"
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static const size_t _nl_category_num_items[] =
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{
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#define DEFINE_CATEGORY(category, category_name, items, a) \
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[category] = _NL_ITEM_INDEX (_NL_NUM_##category),
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#include "categories.def"
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#undef DEFINE_CATEGORY
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};
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#define NO_PAREN(arg, rest...) arg, ##rest
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/* The size of the array must be specified explicitly because some of
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the 'items' may be subarrays, which will cause the compiler to deduce
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an incorrect size from the initializer. */
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#define DEFINE_CATEGORY(category, category_name, items, a) \
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static const enum value_type _nl_value_type_##category \
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[_NL_ITEM_INDEX (_NL_NUM_##category)] = { NO_PAREN items };
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#define DEFINE_ELEMENT(element, element_name, optstd, type, rest...) \
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[_NL_ITEM_INDEX (element)] = type,
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#include "categories.def"
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#undef DEFINE_CATEGORY
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static const enum value_type *const _nl_value_types[] =
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{
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#define DEFINE_CATEGORY(category, category_name, items, a) \
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[category] = _nl_value_type_##category,
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#include "categories.def"
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#undef DEFINE_CATEGORY
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};
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struct __locale_data *
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_nl_intern_locale_data (int category, const void *data, size_t datasize)
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{
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const struct
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{
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unsigned int magic;
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unsigned int nstrings;
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unsigned int strindex[0];
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} *const filedata = data;
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struct __locale_data *newdata;
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size_t cnt;
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if (__builtin_expect (datasize < sizeof *filedata, 0)
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|| __builtin_expect (filedata->magic != LIMAGIC (category), 0))
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{
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/* Bad data file. */
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__set_errno (EINVAL);
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return NULL;
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}
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if (__builtin_expect (filedata->nstrings < _nl_category_num_items[category],
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0)
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|| (__builtin_expect (sizeof *filedata
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+ filedata->nstrings * sizeof (unsigned int)
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>= datasize, 0)))
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{
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/* Insufficient data. */
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__set_errno (EINVAL);
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return NULL;
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}
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newdata = malloc (sizeof *newdata
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+ filedata->nstrings * sizeof (union locale_data_value));
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if (newdata == NULL)
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return NULL;
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newdata->filedata = (void *) filedata;
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newdata->filesize = datasize;
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newdata->private.data = NULL;
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newdata->private.cleanup = NULL;
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newdata->usage_count = 0;
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newdata->use_translit = 0;
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newdata->nstrings = filedata->nstrings;
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for (cnt = 0; cnt < newdata->nstrings; ++cnt)
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{
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size_t idx = filedata->strindex[cnt];
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if (__glibc_unlikely (idx > (size_t) newdata->filesize))
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{
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puntdata:
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free (newdata);
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__set_errno (EINVAL);
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return NULL;
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}
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/* Determine the type. There is one special case: the LC_CTYPE
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category can have more elements than there are in the
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_nl_value_type_LC_XYZ array. There are all pointers. */
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switch (category)
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{
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#define CATTEST(cat) \
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case LC_##cat: \
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if (cnt >= (sizeof (_nl_value_type_LC_##cat) \
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/ sizeof (_nl_value_type_LC_##cat[0]))) \
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goto puntdata; \
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break
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CATTEST (NUMERIC);
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CATTEST (TIME);
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CATTEST (COLLATE);
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CATTEST (MONETARY);
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CATTEST (MESSAGES);
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CATTEST (PAPER);
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CATTEST (NAME);
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CATTEST (ADDRESS);
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CATTEST (TELEPHONE);
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CATTEST (MEASUREMENT);
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CATTEST (IDENTIFICATION);
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default:
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assert (category == LC_CTYPE);
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break;
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}
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if ((category == LC_CTYPE
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&& cnt >= (sizeof (_nl_value_type_LC_CTYPE)
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/ sizeof (_nl_value_type_LC_CTYPE[0])))
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|| __builtin_expect (_nl_value_types[category][cnt] != word, 1))
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newdata->values[cnt].string = newdata->filedata + idx;
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else
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{
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if (!LOCFILE_ALIGNED_P (idx))
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goto puntdata;
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newdata->values[cnt].word =
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*((const uint32_t *) (newdata->filedata + idx));
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}
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}
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return newdata;
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}
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void
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_nl_load_locale (struct loaded_l10nfile *file, int category)
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{
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int fd;
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void *filedata;
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struct stat64 st;
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struct __locale_data *newdata;
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int save_err;
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int alloc = ld_mapped;
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file->decided = 1;
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file->data = NULL;
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fd = __open_nocancel (file->filename, O_RDONLY | O_CLOEXEC);
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if (__builtin_expect (fd, 0) < 0)
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/* Cannot open the file. */
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return;
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if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) < 0)
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{
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puntfd:
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__close_nocancel_nostatus (fd);
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return;
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}
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if (__glibc_unlikely (S_ISDIR (st.st_mode)))
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{
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/* LOCALE/LC_foo is a directory; open LOCALE/LC_foo/SYS_LC_foo
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instead. */
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char *newp;
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size_t filenamelen;
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__close_nocancel_nostatus (fd);
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filenamelen = strlen (file->filename);
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newp = (char *) alloca (filenamelen
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+ 5 + _nl_category_name_sizes[category] + 1);
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__mempcpy (__mempcpy (__mempcpy (newp, file->filename, filenamelen),
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"/SYS_", 5), _nl_category_names_get (category),
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_nl_category_name_sizes[category] + 1);
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fd = __open_nocancel (newp, O_RDONLY | O_CLOEXEC);
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if (__builtin_expect (fd, 0) < 0)
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return;
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if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) < 0)
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goto puntfd;
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}
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/* Map in the file's data. */
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save_err = errno;
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#ifdef _POSIX_MAPPED_FILES
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# ifndef MAP_COPY
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/* Linux seems to lack read-only copy-on-write. */
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# define MAP_COPY MAP_PRIVATE
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# endif
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# ifndef MAP_FILE
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/* Some systems do not have this flag; it is superfluous. */
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# define MAP_FILE 0
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# endif
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filedata = __mmap ((caddr_t) 0, st.st_size,
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PROT_READ, MAP_FILE|MAP_COPY, fd, 0);
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if (__glibc_unlikely (filedata == MAP_FAILED))
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{
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filedata = NULL;
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if (__builtin_expect (errno, ENOSYS) == ENOSYS)
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{
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#endif /* _POSIX_MAPPED_FILES */
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/* No mmap; allocate a buffer and read from the file. */
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alloc = ld_malloced;
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filedata = malloc (st.st_size);
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if (filedata != NULL)
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{
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off_t to_read = st.st_size;
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ssize_t nread;
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char *p = (char *) filedata;
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while (to_read > 0)
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{
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nread = __read_nocancel (fd, p, to_read);
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if (__builtin_expect (nread, 1) <= 0)
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{
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free (filedata);
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if (nread == 0)
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__set_errno (EINVAL); /* Bizarreness going on. */
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goto puntfd;
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}
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p += nread;
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to_read -= nread;
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}
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__set_errno (save_err);
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}
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#ifdef _POSIX_MAPPED_FILES
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}
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}
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#endif /* _POSIX_MAPPED_FILES */
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/* We have mapped the data, so we no longer need the descriptor. */
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__close_nocancel_nostatus (fd);
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if (__glibc_unlikely (filedata == NULL))
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/* We failed to map or read the data. */
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return;
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newdata = _nl_intern_locale_data (category, filedata, st.st_size);
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if (__glibc_unlikely (newdata == NULL))
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/* Bad data. */
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{
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#ifdef _POSIX_MAPPED_FILES
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if (alloc == ld_mapped)
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__munmap ((caddr_t) filedata, st.st_size);
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#endif
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return;
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}
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/* _nl_intern_locale_data leaves us these fields to initialize. */
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newdata->name = NULL; /* This will be filled if necessary in findlocale.c. */
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newdata->alloc = alloc;
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file->data = newdata;
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}
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void
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_nl_unload_locale (struct __locale_data *locale)
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{
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if (locale->private.cleanup)
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(*locale->private.cleanup) (locale);
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switch (__builtin_expect (locale->alloc, ld_mapped))
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{
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case ld_malloced:
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free ((void *) locale->filedata);
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break;
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case ld_mapped:
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#ifdef _POSIX_MAPPED_FILES
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__munmap ((caddr_t) locale->filedata, locale->filesize);
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break;
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#endif
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case ld_archive: /* Nothing to do. */
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break;
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}
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if (__builtin_expect (locale->alloc, ld_mapped) != ld_archive)
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free ((char *) locale->name);
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free (locale);
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}
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