242 lines
6.1 KiB
C
242 lines
6.1 KiB
C
/* Functions to read locale data files.
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Copyright (C) 1995, 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include "localeinfo.h"
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const size_t _nl_category_num_items[] =
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{
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#define DEFINE_CATEGORY(category, category_name, items, a, b, c, d) \
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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, b, c, d) \
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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, b, c, d) \
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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_load_locale (int category, char **name)
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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 swap = 0;
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inline unsigned int SWAP (const unsigned int *inw)
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{
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const unsigned char *inc = (const unsigned char *) inw;
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if (!swap)
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return *inw;
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return (inc[3] << 24) | (inc[2] << 16) | (inc[1] << 8) | inc[0];
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}
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unsigned int i;
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if ((*name)[0] == '\0')
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{
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*name = getenv ("LC_ALL");
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if (! *name || (*name)[0] == '\0')
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*name = getenv (_nl_category_names[category]);
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if (! *name || (*name)[0] == '\0')
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*name = getenv ("LANG");
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if (! *name || (*name)[0] == '\0')
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*name = (char *) "local";
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}
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{
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const char *catname = _nl_category_names[category];
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size_t namelen = strlen (*name);
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size_t catlen = strlen (catname);
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char file[sizeof LOCALE_PATH + 1 + namelen + catlen * 2 + 4];
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if (strchr (*name, '/') != NULL)
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sprintf (file, "%s/%s", *name, catname);
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else
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sprintf (file, "%s/%s/%s", LOCALE_PATH, *name, catname);
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fd = __open (file, O_RDONLY);
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if (fd < 0)
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return NULL;
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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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__close (fd);
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memcpy (stpcpy (strchr (file, '\0'), "SYS_"), catname, catlen);
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fd = __open (file, O_RDONLY);
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if (fd < 0)
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return NULL;
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if (__fstat (fd, &st) < 0)
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goto puntfd;
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}
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}
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{
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/* Map in the file's data. */
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int save = 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,
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PROT_READ, MAP_FILE|MAP_COPY|MAP_INHERIT,
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fd, 0);
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if (filedata == (void *) -1)
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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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filedata = malloc (st.st_size);
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if (filedata)
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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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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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errno = save;
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}
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else
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goto puntfd;
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}
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}
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if (filedata->magic == LIMAGIC (category))
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/* Good data file in our byte order. */
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swap = 0;
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else
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{
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/* Try the other byte order. */
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swap = 1;
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if (SWAP (&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 NULL;
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}
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}
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#define W(word) SWAP (&(word))
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if (W (filedata->nstrings) < _nl_category_num_items[category] ||
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(sizeof *filedata + W (filedata->nstrings) * sizeof (unsigned int)
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>= st.st_size))
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{
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/* Insufficient data. */
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errno = EINVAL;
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goto puntmap;
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}
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newdata = malloc (sizeof *newdata +
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W (filedata->nstrings) * sizeof (union locale_data_value));
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if (! newdata)
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goto puntmap;
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newdata->filedata = (void *) filedata;
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newdata->filesize = st.st_size;
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newdata->nstrings = W (filedata->nstrings);
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for (i = 0; i < newdata->nstrings; ++i)
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{
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unsigned int idx = W (filedata->strindex[i]);
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if (idx >= newdata->filesize)
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{
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free (newdata);
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errno = EINVAL;
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goto puntmap;
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}
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if (_nl_value_types[category][i] == word)
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newdata->values[i].word = W (*((u32_t *) (newdata->filedata + idx)));
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else
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newdata->values[i].string = newdata->filedata + idx;
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}
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__close (fd);
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return newdata;
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}
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void
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_nl_free_locale (struct locale_data *data)
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{
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int save = errno;
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if (! data)
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/* Ignore a null pointer, like free does. */
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return;
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if (__munmap ((caddr_t) data->filedata, data->filesize) < 0)
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{
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if (errno == ENOSYS)
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free ((void *) data->filedata);
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errno = save;
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}
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free (data);
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}
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