OpenBSD-4.6/lib/libc/locale/setlocale.c
/* $OpenBSD: setlocale.c,v 1.17 2007/11/28 10:24:38 chl Exp $ */
/*
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Paul Borman at Krystal Technologies.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/localedef.h>
#include <locale.h>
#include <limits.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "rune.h"
#include "rune_local.h"
/*
* Category names for getenv()
*/
static char *categories[_LC_LAST] = {
"LC_ALL",
"LC_COLLATE",
"LC_CTYPE",
"LC_MONETARY",
"LC_NUMERIC",
"LC_TIME",
"LC_MESSAGES"
};
/*
* Current locales for each category
*/
static char current_categories[_LC_LAST][32] = {
"C",
"C",
"C",
"C",
"C",
"C",
"C"
};
/*
* The locales we are going to try and load
*/
static char new_categories[_LC_LAST][32];
static char current_locale_string[_LC_LAST * 33];
static char *currentlocale(void);
static void revert_to_default(int);
static int load_locale_sub(int, const char *, int);
static char *loadlocale(int);
static const char *__get_locale_env(int);
char *
setlocale(int category, const char *locale)
{
int i, loadlocale_success;
size_t len;
const char *env, *r;
if (issetugid() != 0 ||
((!_PathLocale && !(_PathLocale = getenv("PATH_LOCALE"))) ||
!*_PathLocale))
_PathLocale = _PATH_LOCALE;
if (category < 0 || category >= _LC_LAST)
return (NULL);
if (!locale)
return (category ?
current_categories[category] : currentlocale());
/*
* Default to the current locale for everything.
*/
for (i = 1; i < _LC_LAST; ++i)
(void)strlcpy(new_categories[i], current_categories[i],
sizeof(new_categories[i]));
/*
* Now go fill up new_categories from the locale argument
*/
if (!*locale) {
if (category == LC_ALL) {
for (i = 1; i < _LC_LAST; ++i) {
env = __get_locale_env(i);
(void)strlcpy(new_categories[i], env,
sizeof(new_categories[i]));
}
}
else {
env = __get_locale_env(category);
(void)strlcpy(new_categories[category], env,
sizeof(new_categories[category]));
}
} else if (category) {
(void)strlcpy(new_categories[category], locale,
sizeof(new_categories[category]));
} else {
if ((r = strchr(locale, '/')) == 0) {
for (i = 1; i < _LC_LAST; ++i) {
(void)strlcpy(new_categories[i], locale,
sizeof(new_categories[i]));
}
} else {
for (i = 1;;) {
if (*locale == '/')
return (NULL); /* invalid format. */
len = r - locale;
if (len + 1 > sizeof(new_categories[i]))
return (NULL); /* too long */
(void)memcpy(new_categories[i], locale, len);
new_categories[i][len] = '\0';
if (*r == 0)
break;
if (*(locale = ++r) == 0)
/* slash followed by NUL */
return (NULL);
/* skip until NUL or '/' */
while (*r && *r != '/')
r++;
if (++i == _LC_LAST)
return (NULL); /* too many slashes. */
}
if (i + 1 != _LC_LAST)
return (NULL); /* too few slashes. */
}
}
if (category)
return (loadlocale(category));
loadlocale_success = 0;
for (i = 1; i < _LC_LAST; ++i) {
if (loadlocale(i) != NULL)
loadlocale_success = 1;
}
/*
* If all categories failed, return NULL; we don't need to back
* changes off, since none happened.
*/
if (!loadlocale_success)
return NULL;
return (currentlocale());
}
static char *
currentlocale(void)
{
int i;
(void)strlcpy(current_locale_string, current_categories[1],
sizeof(current_locale_string));
for (i = 2; i < _LC_LAST; ++i)
if (strcmp(current_categories[1], current_categories[i])) {
(void)snprintf(current_locale_string,
sizeof(current_locale_string), "%s/%s/%s/%s/%s/%s",
current_categories[1], current_categories[2],
current_categories[3], current_categories[4],
current_categories[5], current_categories[6]);
break;
}
return (current_locale_string);
}
static void
revert_to_default(int category)
{
switch (category) {
case LC_CTYPE:
(void)_xpg4_setrunelocale("C");
__install_currentrunelocale_ctype();
break;
case LC_MESSAGES:
case LC_COLLATE:
case LC_MONETARY:
case LC_NUMERIC:
case LC_TIME:
break;
}
}
static int
load_locale_sub(int category, const char *locname, int isspecial)
{
char name[PATH_MAX];
int len;
/* check for the default locales */
if (!strcmp(new_categories[category], "C") ||
!strcmp(new_categories[category], "POSIX")) {
revert_to_default(category);
return 0;
}
/* sanity check */
if (strchr(locname, '/') != NULL)
return -1;
len = snprintf(name, sizeof(name), "%s/%s/%s",
_PathLocale, locname, categories[category]);
if (len < 0 || len >= sizeof(name))
return -1;
switch (category) {
case LC_CTYPE:
if (_xpg4_setrunelocale(locname))
return -1;
__install_currentrunelocale_ctype();
break;
case LC_MESSAGES:
case LC_COLLATE:
case LC_MONETARY:
case LC_NUMERIC:
case LC_TIME:
return -1;
}
return 0;
}
static char *
loadlocale(int category)
{
if (strcmp(new_categories[category],
current_categories[category]) == 0)
return (current_categories[category]);
if (!load_locale_sub(category, new_categories[category], 0)) {
(void)strlcpy(current_categories[category],
new_categories[category], sizeof(current_categories[category]));
return current_categories[category];
} else {
return NULL;
}
}
static const char *
__get_locale_env(int category)
{
const char *env;
/* 1. check LC_ALL. */
env = getenv(categories[0]);
/* 2. check LC_* */
if (!env || !*env)
env = getenv(categories[category]);
/* 3. check LANG */
if (!env || !*env)
env = getenv("LANG");
/* 4. if none is set, fall to "C" */
if (!env || !*env || strchr(env, '/'))
env = "C";
return env;
}