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/* Functions to read locale data files.
Copyright (C) 1996 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 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 <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include "localeinfo.h"
static const size_t _nl_category_num_items[] =
{
#define DEFINE_CATEGORY(category, category_name, items, a, b, c, d) \
[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, b, c, d) \
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, b, c, d) \
[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 swap = 0;
size_t cnt;
inline unsigned int SWAP (const unsigned int *inw)
{
const unsigned char *inc = (const unsigned char *) inw;
if (!swap)
return *inw;
return (inc[3] << 24) | (inc[2] << 16) | (inc[1] << 8) | inc[0];
}
file->decided = 1;
file->data = NULL;
fd = __open (file->filename, O_RDONLY);
if (fd < 0)
/* Cannot open the file. */
return;
if (__fstat (fd, &st) < 0)
goto puntfd;
if (S_ISDIR (st.st_mode))
{
/* LOCALE/LC_foo is a directory; open LOCALE/LC_foo/SYS_LC_foo
instead. */
char *newp;
__close (fd);
newp = (char *) alloca (strlen (file->filename)
+ 5 + _nl_category_name_sizes[category] + 1);
__stpcpy (__stpcpy (__stpcpy (newp, file->filename), "/SYS_"),
_nl_category_names[category]);
fd = __open (newp, O_RDONLY);
if (fd < 0)
return;
if (__fstat (fd, &st) < 0)
goto puntfd;
}
/* Map in the file's data. */
save_err = errno;
#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 (filedata == (void *) -1)
{
if (errno == ENOSYS)
{
/* No mmap; allocate a buffer and read from the file. */
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 (nread <= 0)
{
free (filedata);
if (nread == 0)
errno = EINVAL; /* Bizarreness going on. */
goto puntfd;
}
p += nread;
to_read -= nread;
}
}
else
goto puntfd;
errno = save_err;
}
else
goto puntfd;
}
if (filedata->magic == LIMAGIC (category))
/* Good data file in our byte order. */
swap = 0;
else
{
/* Try the other byte order. */
swap = 1;
if (SWAP (&filedata->magic) != LIMAGIC (category))
/* Bad data file in either byte order. */
{
puntmap:
__munmap ((caddr_t) filedata, st.st_size);
puntfd:
__close (fd);
return;
}
}
#define W(word) SWAP (&(word))
if (W (filedata->nstrings) < _nl_category_num_items[category] ||
(sizeof *filedata + W (filedata->nstrings) * sizeof (unsigned int)
>= st.st_size))
{
/* Insufficient data. */
errno = EINVAL;
goto puntmap;
}
newdata = malloc (sizeof *newdata +
(_nl_category_num_items[category]
* sizeof (union locale_data_value)));
if (! newdata)
goto puntmap;
newdata->name = NULL; /* This will be filled if necessary in findlocale.c. */
newdata->filedata = (void *) filedata;
newdata->filesize = st.st_size;
newdata->nstrings = _nl_category_num_items[category];
for (cnt = 0; cnt < newdata->nstrings; ++cnt)
{
off_t idx = W (filedata->strindex[cnt]);
if (idx >= newdata->filesize)
{
free (newdata);
errno = EINVAL;
goto puntmap;
}
if (_nl_value_types[category][cnt] == word)
newdata->values[cnt].word = W (*((u_int32_t *) (newdata->filedata
+ idx)));
else
newdata->values[cnt].string = newdata->filedata + idx;
}
__close (fd);
file->data = newdata;
}
void
_nl_free_locale (const struct locale_data *data)
{
int save = errno;
if (data == NULL)
/* Ignore a null pointer, like free does. */
return;
if (data->name != NULL)
free ((void *) data->name);
if (__munmap ((caddr_t) data->filedata, data->filesize) < 0)
{
if (errno == ENOSYS)
free ((void *) data->filedata);
errno = save;
}
free ((void *) data);
}
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