219 lines
5.6 KiB
C
219 lines
5.6 KiB
C
/* Functions to read locale data files.
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Copyright (C) 1996, 1997, 1998, 1999 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <fcntl.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 <sys/mman.h>
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#include <sys/stat.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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#define DEFINE_CATEGORY(category, category_name, items, a) \
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static const enum value_type _nl_value_type_##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 *_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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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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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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} *filedata;
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struct stat st;
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struct locale_data *newdata;
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int save_err;
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int mmaped = 1;
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size_t cnt;
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file->decided = 1;
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file->data = NULL;
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fd = __open (file->filename, O_RDONLY);
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if (fd < 0)
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/* Cannot open the file. */
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return;
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if (__fstat (fd, &st) < 0)
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goto puntfd;
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if (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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__close (fd);
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newp = (char *) alloca (strlen (file->filename)
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+ 5 + _nl_category_name_sizes[category] + 1);
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__stpcpy (__stpcpy (__stpcpy (newp, file->filename), "/SYS_"),
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_nl_category_names[category]);
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fd = __open (newp, O_RDONLY);
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if (fd < 0)
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return;
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if (__fstat (fd, &st) < 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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#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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#ifndef MAP_INHERIT
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/* Some systems might lack this; they lose. */
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#define MAP_INHERIT 0
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#endif
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filedata = (void *) __mmap ((caddr_t) 0, st.st_size, PROT_READ,
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MAP_FILE|MAP_COPY|MAP_INHERIT, fd, 0);
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if ((void *) filedata == MAP_FAILED)
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{
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if (errno == ENOSYS)
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{
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/* No mmap; allocate a buffer and read from the file. */
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mmaped = 0;
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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 (fd, p, to_read);
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if (nread <= 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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}
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else
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goto puntfd;
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__set_errno (save_err);
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}
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else
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goto puntfd;
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}
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else if (st.st_size < sizeof (*filedata))
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/* This cannot be a locale data file since it's too small. */
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goto puntfd;
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if (filedata->magic != LIMAGIC (category))
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/* Bad data file in either byte order. */
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{
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puntmap:
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__munmap ((caddr_t) filedata, st.st_size);
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puntfd:
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__close (fd);
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return;
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}
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if (filedata->nstrings < _nl_category_num_items[category] ||
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(sizeof *filedata + filedata->nstrings * sizeof (unsigned int)
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>= (size_t) st.st_size))
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{
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/* Insufficient data. */
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__set_errno (EINVAL);
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goto puntmap;
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}
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newdata = malloc (sizeof *newdata
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+ (_nl_category_num_items[category]
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* sizeof (union locale_data_value)));
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if (! newdata)
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goto puntmap;
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newdata->name = NULL; /* This will be filled if necessary in findlocale.c. */
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newdata->filedata = (void *) filedata;
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newdata->filesize = st.st_size;
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newdata->mmaped = mmaped;
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newdata->usage_count = 0;
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newdata->nstrings = _nl_category_num_items[category];
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for (cnt = 0; cnt < newdata->nstrings; ++cnt)
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{
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off_t idx = filedata->strindex[cnt];
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if (idx >= newdata->filesize)
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{
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free (newdata);
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__set_errno (EINVAL);
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goto puntmap;
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}
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if (_nl_value_types[category][cnt] == word)
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newdata->values[cnt].word = *((u_int32_t *) (newdata->filedata + idx));
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else
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newdata->values[cnt].string = newdata->filedata + idx;
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}
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__close (fd);
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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->mmaped)
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__munmap ((caddr_t) locale->filedata, locale->filesize);
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else
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free ((void *) locale->filedata);
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free (locale);
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}
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