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elinks/src/intl/gettext/localealias.c
Petr Baudis 0f6d4310ad Initial commit of the HEAD branch of the ELinks CVS repository, as of
Thu Sep 15 15:57:07 CEST 2005. The previous history can be added to this
by grafting.
2005-09-15 15:58:31 +02:00

290 lines
7.0 KiB
C

/* Handle aliases for locale names.
Copyright (C) 1995-1999, 2000, 2001 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Tell glibc's <string.h> to provide a prototype for mempcpy().
This must come before <config.h> because <config.h> may include
<features.h>, and once <features.h> has been included, it's too late. */
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <ctype.h>
#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include "elinks.h"
#include "intl/gettext/gettextP.h"
#include "util/memory.h"
#include "util/string.h"
#ifdef HAVE_FGETS_UNLOCKED
#undef fgets
#define fgets(buf, len, s) fgets_unlocked (buf, len, s)
#endif
#ifdef HAVE_FEOF_UNLOCKED
#undef feof
#define feof(s) feof_unlocked (s)
#endif
struct alias_map {
const unsigned char *alias;
const unsigned char *value;
};
static unsigned char *string_space;
static size_t string_space_act;
static size_t string_space_max;
static struct alias_map *map;
static size_t nmap;
static size_t maxmap;
/* Prototypes for local functions. */
static size_t read_alias_file(const unsigned char *fname, int fname_len);
static int extend_alias_table(void);
static int alias_compare(const struct alias_map * map1,
const struct alias_map * map2);
const unsigned char *
_nl_expand_alias(const unsigned char *name)
{
static const unsigned char *locale_alias_path = LOCALEDIR;
struct alias_map *retval;
const unsigned char *result = NULL;
size_t added;
do {
struct alias_map item;
item.alias = name;
if (nmap > 0)
retval = (struct alias_map *) bsearch(&item, map, nmap,
sizeof(struct
alias_map),
(int (*)
(const void *,
const void *)
) alias_compare);
else
retval = NULL;
/* We really found an alias. Return the value. */
if (retval != NULL) {
result = retval->value;
break;
}
/* Perhaps we can find another alias file. */
added = 0;
while (added == 0 && locale_alias_path[0] != '\0') {
const unsigned char *start;
while (locale_alias_path[0] == PATH_SEPARATOR)
++locale_alias_path;
start = locale_alias_path;
while (locale_alias_path[0] != '\0'
&& locale_alias_path[0] != PATH_SEPARATOR)
++locale_alias_path;
if (start < locale_alias_path)
added = read_alias_file(start,
locale_alias_path -
start);
}
}
while (added != 0);
return result;
}
static size_t
read_alias_file(const unsigned char *fname, int fname_len)
{
FILE *fp;
unsigned char *full_fname;
size_t added;
static const unsigned char aliasfile[] = "/locale.alias";
full_fname = (unsigned char *) fmem_alloc(fname_len + sizeof(aliasfile));
mempcpy(mempcpy(full_fname, fname, fname_len),
aliasfile, sizeof(aliasfile));
fp = fopen(full_fname, "rb");
fmem_free(full_fname);
if (fp == NULL)
return 0;
added = 0;
while (!feof(fp)) {
/* It is a reasonable approach to use a fix buffer here because
a) we are only interested in the first two fields
b) these fields must be usable as file names and so must not
be that long
*/
unsigned char buf[BUFSIZ];
unsigned char *alias;
unsigned char *value;
unsigned char *cp;
if (fgets(buf, sizeof(buf), fp) == NULL)
/* EOF reached. */
break;
/* Possibly not the whole line fits into the buffer. Ignore
the rest of the line. */
if (strchr(buf, '\n') == NULL) {
unsigned char altbuf[BUFSIZ];
do
if (fgets(altbuf, sizeof(altbuf), fp) == NULL)
/* Make sure the inner loop will be left. The outer loop
will exit at the `feof' test. */
break;
while (strchr(altbuf, '\n') == NULL);
}
cp = buf;
/* Ignore leading white space. */
skip_space(cp);
/* A leading '#' signals a comment line. */
if (cp[0] != '\0' && cp[0] != '#') {
alias = cp++;
skip_nonspace(cp);
/* Terminate alias name. */
if (cp[0] != '\0')
*cp++ = '\0';
/* Now look for the beginning of the value. */
skip_space(cp);
if (cp[0] != '\0') {
size_t alias_len;
size_t value_len;
value = cp++;
skip_nonspace(cp);
/* Terminate value. */
if (cp[0] == '\n') {
/* This has to be done to make the following test
for the end of line possible. We are looking for
the terminating '\n' which do not overwrite here. */
*cp++ = '\0';
*cp = '\n';
} else if (cp[0] != '\0')
*cp++ = '\0';
if (nmap >= maxmap)
if (extend_alias_table())
return added;
alias_len = strlen(alias) + 1;
value_len = strlen(value) + 1;
if (string_space_act + alias_len + value_len >
string_space_max) {
/* Increase size of memory pool. */
size_t new_size = (string_space_max
+ (alias_len +
value_len >
1024 ? alias_len +
value_len :
1024));
unsigned char *new_pool =
(unsigned char *) realloc(string_space,
new_size);
if (new_pool == NULL)
return added;
if (string_space != new_pool) {
size_t i;
for (i = 0; i < nmap; i++) {
map[i].alias +=
new_pool -
string_space;
map[i].value +=
new_pool -
string_space;
}
}
string_space = new_pool;
string_space_max = new_size;
}
map[nmap].alias =
memcpy(&string_space[string_space_act],
alias, alias_len);
string_space_act += alias_len;
map[nmap].value =
memcpy(&string_space[string_space_act],
value, value_len);
string_space_act += value_len;
++nmap;
++added;
}
}
}
/* Should we test for ferror()? I think we have to silently ignore
errors. --drepper */
fclose(fp);
if (added > 0)
qsort(map, nmap, sizeof(struct alias_map),
(int (*)(const void *, const void *))
alias_compare);
return added;
}
static int
extend_alias_table(void)
{
size_t new_size;
struct alias_map *new_map;
new_size = maxmap == 0 ? 100 : 2 * maxmap;
new_map = (struct alias_map *) realloc(map, (new_size
*
sizeof(struct alias_map)));
if (new_map == NULL)
/* Simply don't extend: we don't have any more core. */
return -1;
map = new_map;
maxmap = new_size;
return 0;
}
static int
alias_compare(const struct alias_map *map1, const struct alias_map *map2)
{
return strcasecmp(map1->alias, map2->alias);
}