NetBSD/lib/libc/locale/setlocale.c

423 lines
10 KiB
C

/* $NetBSD: setlocale.c,v 1.52 2007/09/29 07:55:45 tnozaki 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/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)setlocale.c 8.1 (Berkeley) 7/4/93";
#else
__RCSID("$NetBSD: setlocale.c,v 1.52 2007/09/29 07:55:45 tnozaki Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#define _CTYPE_PRIVATE
#include "namespace.h"
#include <sys/localedef.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <assert.h>
#include <limits.h>
#include <ctype.h>
#define __SETLOCALE_SOURCE__
#include <locale.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef WITH_RUNE
#include "rune.h"
#include "rune_local.h"
#else
#include "ctypeio.h"
#endif
#include "timeio.h"
#ifdef CITRUS
#include <citrus/citrus_namespace.h>
#include <citrus/citrus_region.h>
#include <citrus/citrus_lookup.h>
#include <citrus/citrus_bcs.h>
#else
#include <locale/aliasname_local.h>
#define _lookup_alias(p, a, b, s, c) __unaliasname((p), (a), (b), (s))
#define _bcs_strcasecmp(a, b) strcasecmp((a), (b))
#endif
#define _LOCALE_SYM_FORCE "/force"
/*
* Category names for getenv()
*/
static const char *const 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 __P((void));
static void revert_to_default __P((int));
static int force_locale_enable __P((int));
static int load_locale_sub __P((int, const char *, int));
static char *loadlocale __P((int));
static const char *__get_locale_env __P((int));
char *
__setlocale(category, locale)
int category;
const char *locale;
{
int i, loadlocale_success;
size_t len;
const char *env, *r;
if (issetugid() ||
(!_PathLocale && !(_PathLocale = getenv("PATH_LOCALE"))))
_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;;) {
_DIAGASSERT(*r == '/' || *r == 0);
_DIAGASSERT(*locale != 0);
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;
_DIAGASSERT(*r == '/');
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()
{
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(category)
int category;
{
switch (category) {
case LC_CTYPE:
#ifdef WITH_RUNE
(void)_xpg4_setrunelocale("C");
#else
if (_ctype_ != _C_ctype_) {
/* LINTED const castaway */
free((void *)_ctype_);
_ctype_ = _C_ctype_;
}
if (_toupper_tab_ != _C_toupper_) {
/* LINTED const castaway */
free((void *)_toupper_tab_);
_toupper_tab_ = _C_toupper_;
}
if (_tolower_tab_ != _C_tolower_) {
/* LINTED const castaway */
free((void *)_tolower_tab_);
_tolower_tab_ = _C_tolower_;
}
#endif
break;
case LC_TIME:
if (_CurrentTimeLocale != &_DefaultTimeLocale) {
free((void *)_CurrentTimeLocale);
_CurrentTimeLocale = &_DefaultTimeLocale;
}
break;
case LC_MESSAGES:
case LC_COLLATE:
case LC_MONETARY:
case LC_NUMERIC:
break;
}
}
static int
force_locale_enable(category)
int category;
{
revert_to_default(category);
return 0;
}
static int
load_locale_sub(category, locname, isspecial)
int category;
const char *locname;
int isspecial;
{
char name[PATH_MAX];
/* check for the default locales */
if (!strcmp(new_categories[category], "C") ||
!strcmp(new_categories[category], "POSIX")) {
revert_to_default(category);
return 0;
}
/* check whether special symbol */
if (isspecial && _bcs_strcasecmp(locname, _LOCALE_SYM_FORCE) == 0)
return force_locale_enable(category);
/* sanity check */
if (strchr(locname, '/') != NULL)
return -1;
(void)snprintf(name, sizeof(name), "%s/%s/%s",
_PathLocale, locname, categories[category]);
switch (category) {
case LC_CTYPE:
#ifdef WITH_RUNE
if (_xpg4_setrunelocale(__UNCONST(locname)))
return -1;
#else
if (!__loadctype(name))
return -1;
#endif
break;
case LC_MESSAGES:
/*
* XXX we don't have LC_MESSAGES support yet,
* but catopen may use the value of LC_MESSAGES category.
* so return successfully if locale directory is present.
*/
(void)snprintf(name, sizeof(name), "%s/%s",
_PathLocale, locname);
/* local */
{
struct stat st;
if (stat(name, &st) < 0)
return -1;
if (!S_ISDIR(st.st_mode))
return -1;
}
break;
case LC_TIME:
if (!__loadtime(name))
return -1;
break;
case LC_COLLATE:
case LC_MONETARY:
case LC_NUMERIC:
return -1;
}
return 0;
}
static char *
loadlocale(category)
int category;
{
char aliaspath[PATH_MAX], loccat[PATH_MAX], buf[PATH_MAX];
const char *alias;
_DIAGASSERT(0 < category && category < _LC_LAST);
if (strcmp(new_categories[category], current_categories[category]) == 0)
return (current_categories[category]);
/* (1) non-aliased file */
if (!load_locale_sub(category, new_categories[category], 0))
goto success;
/* (2) lookup locname/catname type alias */
(void)snprintf(aliaspath, sizeof(aliaspath),
"%s/" _LOCALE_ALIAS_NAME, _PathLocale);
(void)snprintf(loccat, sizeof(loccat), "%s/%s",
new_categories[category], categories[category]);
alias = _lookup_alias(aliaspath, loccat, buf, sizeof(buf),
_LOOKUP_CASE_SENSITIVE);
if (!load_locale_sub(category, alias, 1))
goto success;
/* (3) lookup locname type alias */
alias = _lookup_alias(aliaspath, new_categories[category],
buf, sizeof(buf), _LOOKUP_CASE_SENSITIVE);
if (!load_locale_sub(category, alias, 1))
goto success;
return NULL;
success:
(void)strlcpy(current_categories[category],
new_categories[category],
sizeof(current_categories[category]));
return current_categories[category];
}
static const char *
__get_locale_env(category)
int category;
{
const char *env;
_DIAGASSERT(category != LC_ALL);
/* 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;
}