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/* Functions to read locale data files.
Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef _POSIX_MAPPED_FILES
# include <sys/mman.h>
#endif
#include <sys/stat.h>
#include "localeinfo.h"
static const size_t _nl_category_num_items[] =
{
#define DEFINE_CATEGORY(category, category_name, items, a) \
[category] = _NL_ITEM_INDEX (_NL_NUM_##category),
#include "categories.def"
#undef DEFINE_CATEGORY
};
#define NO_PAREN(arg, rest...) arg, ##rest
#define DEFINE_CATEGORY(category, category_name, items, a) \
static const enum value_type _nl_value_type_##category[] = { NO_PAREN items };
#define DEFINE_ELEMENT(element, element_name, optstd, type, rest...) \
[_NL_ITEM_INDEX (element)] = type,
#include "categories.def"
#undef DEFINE_CATEGORY
static const enum value_type *_nl_value_types[] =
{
#define DEFINE_CATEGORY(category, category_name, items, a) \
[category] = _nl_value_type_##category,
#include "categories.def"
#undef DEFINE_CATEGORY
};
void
_nl_load_locale (struct loaded_l10nfile *file, int category)
{
int fd;
struct
{
unsigned int magic;
unsigned int nstrings;
unsigned int strindex[0];
} *filedata;
struct stat st;
struct locale_data *newdata;
int save_err;
int mmaped = 1;
size_t cnt;
file->decided = 1;
file->data = NULL;
fd = __open (file->filename, O_RDONLY);
if (__builtin_expect (fd, 0) < 0)
/* Cannot open the file. */
return;
if (__builtin_expect (__fstat (fd, &st), 0) < 0)
goto puntfd;
if (__builtin_expect (S_ISDIR (st.st_mode), 0))
{
/* LOCALE/LC_foo is a directory; open LOCALE/LC_foo/SYS_LC_foo
instead. */
char *newp;
size_t filenamelen;
__close (fd);
filenamelen = strlen (file->filename);
newp = (char *) alloca (filenamelen
+ 5 + _nl_category_name_sizes[category] + 1);
__mempcpy (__mempcpy (__mempcpy (newp, file->filename, filenamelen),
"/SYS_", 5),
_nl_category_names[category],
_nl_category_name_sizes[category] + 1);
fd = __open (newp, O_RDONLY);
if (__builtin_expect (fd, 0) < 0)
return;
if (__builtin_expect (__fstat (fd, &st), 0) < 0)
goto puntfd;
}
/* Map in the file's data. */
save_err = errno;
#ifdef _POSIX_MAPPED_FILES
# ifndef MAP_COPY
/* Linux seems to lack read-only copy-on-write. */
# define MAP_COPY MAP_PRIVATE
# endif
# ifndef MAP_FILE
/* Some systems do not have this flag; it is superfluous. */
# define MAP_FILE 0
# endif
# ifndef MAP_INHERIT
/* Some systems might lack this; they lose. */
# define MAP_INHERIT 0
# endif
filedata = (void *) __mmap ((caddr_t) 0, st.st_size, PROT_READ,
MAP_FILE|MAP_COPY|MAP_INHERIT, fd, 0);
if (__builtin_expect ((void *) filedata != MAP_FAILED, 1))
{
if (__builtin_expect (st.st_size < sizeof (*filedata), 0))
/* This cannot be a locale data file since it's too small. */
goto puntfd;
}
else
{
if (__builtin_expect (errno, ENOSYS) == ENOSYS)
{
#endif /* _POSIX_MAPPED_FILES */
/* No mmap; allocate a buffer and read from the file. */
mmaped = 0;
filedata = malloc (st.st_size);
if (filedata != NULL)
{
off_t to_read = st.st_size;
ssize_t nread;
char *p = (char *) filedata;
while (to_read > 0)
{
nread = __read (fd, p, to_read);
if (__builtin_expect (nread, 1) <= 0)
{
free (filedata);
if (nread == 0)
__set_errno (EINVAL); /* Bizarreness going on. */
goto puntfd;
}
p += nread;
to_read -= nread;
}
}
else
goto puntfd;
__set_errno (save_err);
#ifdef _POSIX_MAPPED_FILES
}
else
goto puntfd;
}
#endif /* _POSIX_MAPPED_FILES */
if (__builtin_expect (filedata->magic != LIMAGIC (category), 0))
/* Bad data file in either byte order. */
{
puntmap:
#ifdef _POSIX_MAPPED_FILES
__munmap ((caddr_t) filedata, st.st_size);
#endif
puntfd:
__close (fd);
return;
}
if (__builtin_expect (filedata->nstrings < _nl_category_num_items[category],
0)
|| (__builtin_expect (sizeof *filedata
+ filedata->nstrings * sizeof (unsigned int)
>= (size_t) st.st_size, 0)))
{
/* Insufficient data. */
__set_errno (EINVAL);
goto puntmap;
}
newdata = malloc (sizeof *newdata
+ filedata->nstrings * sizeof (union locale_data_value));
if (newdata == NULL)
goto puntmap;
newdata->name = NULL; /* This will be filled if necessary in findlocale.c. */
newdata->filedata = (void *) filedata;
newdata->filesize = st.st_size;
newdata->mmaped = mmaped;
newdata->usage_count = 0;
newdata->use_translit = 0;
newdata->options = NULL;
newdata->nstrings = filedata->nstrings;
for (cnt = 0; cnt < newdata->nstrings; ++cnt)
{
off_t idx = filedata->strindex[cnt];
if (__builtin_expect (idx > newdata->filesize, 0))
{
free (newdata);
__set_errno (EINVAL);
goto puntmap;
}
if (__builtin_expect (_nl_value_types[category][cnt] == word, 0))
{
assert (idx % 4 == 0);
newdata->values[cnt].word =
*((u_int32_t *) (newdata->filedata + idx));
}
else
newdata->values[cnt].string = newdata->filedata + idx;
}
__close (fd);
file->data = newdata;
}
void
_nl_unload_locale (struct locale_data *locale)
{
#ifdef _POSIX_MAPPED_FILES
if (__builtin_expect (locale->mmaped, 1))
__munmap ((caddr_t) locale->filedata, locale->filesize);
else
#endif
free ((void *) locale->filedata);
free ((char *) locale->options);
free ((char *) locale->name);
free (locale);
}
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