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/* Functions to read locale data files.
Copyright (C) 1995 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include "localeinfo.h"
const size_t _nl_category_num_items[] =
{
#define DEFINE_CATEGORY(category, category_name, items, a, b, c, d) \
[category] = _NL_NUM_##category,
#include "categories.def"
#undef DEFINE_CATEGORY
};
struct locale_data *
_nl_load_locale (int category, char **name)
{
char *file;
int fd;
struct
{
unsigned int magic;
unsigned int nstrings;
unsigned int strindex[0];
} *filedata;
struct stat st;
struct locale_data *newdata;
int swap = 0;
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];
}
unsigned int i;
if ((*name)[0] == '\0')
{
*name = getenv (_nl_category_names[category]);
if (! *name || (*name) == '\0')
*name = getenv ("LANG");
if (! *name || (*name) == '\0')
*name = (char *) "local";
}
/* XXX can't use asprintf here */
if (asprintf (&file, "%s%s/%s",
strchr (*name, '/') != NULL ? "" : "/share/locale/", /* XXX */
*name, _nl_category_names[category]) == -1)
return NULL;
fd = __open (file, O_RDONLY);
free (file);
if (fd < 0)
return NULL;
if (__fstat (fd, &st) < 0)
goto puntfd;
{
/* Map in the file's data. */
int save = errno;
#ifndef MAP_COPY
/* Linux seems to lack read-only copy-on-write. */
#define MAP_COPY MAP_PRIVATE
#endif
filedata = (void *) __mmap ((caddr_t) 0, st.st_size,
PROT_READ, MAP_FILE|MAP_COPY, 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)
{
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;
}
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 NULL;
}
}
#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 +
W (filedata->nstrings) * sizeof (char *));
if (! newdata)
goto puntmap;
newdata->filedata = (void *) filedata;
newdata->filesize = st.st_size;
newdata->nstrings = W (filedata->nstrings);
for (i = 0; i < newdata->nstrings; ++i)
{
unsigned int idx = W (filedata->strindex[i]);
if (idx >= newdata->filesize)
{
free (newdata);
errno = EINVAL;
goto puntmap;
}
newdata->strings[i] = newdata->filedata + idx;
}
return newdata;
}
void
_nl_free_locale (struct locale_data *data)
{
int save = errno;
if (__munmap ((caddr_t) data->filedata, data->filesize) < 0)
{
if (errno == ENOSYS)
free ((void *) data->filedata);
errno = save;
}
free (data);
}
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