freebsd-nq/lib/libc/locale/setlocale.c
Andrey A. Chernov 2b3e51b901 Add yet one comment saying that range checking already done
to stop people "fixing" it by snprintf
1997-02-03 08:29:32 +00:00

325 lines
8.0 KiB
C

/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*
* $FreeBSD$
*/
#ifdef LIBC_RCS
static const char rcsid[] =
"$FreeBSD$";
#endif
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)setlocale.c 8.1 (Berkeley) 7/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/types.h>
#include <sys/stat.h>
#include <limits.h>
#include <locale.h>
#include <rune.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "collate.h"
/*
* Category names for getenv()
*/
static char *categories[_LC_LAST] = {
"LC_ALL",
"LC_COLLATE",
"LC_CTYPE",
"LC_MONETARY",
"LC_NUMERIC",
"LC_TIME",
};
/*
* Current locales for each category
*/
static char current_categories[_LC_LAST][32] = {
"C",
"C",
"C",
"C",
"C",
"C",
};
/*
* The locales we are going to try and load
*/
static char new_categories[_LC_LAST][32];
static char saved_categories[_LC_LAST][32];
static char current_locale_string[_LC_LAST * 33];
char *_PathLocale;
static char *currentlocale __P((void));
static char *loadlocale __P((int));
static int stub_load_locale __P((const char *));
extern int __time_load_locale __P((const char *)); /* strftime.c */
#ifdef XPG4
extern int _xpg4_setrunelocale __P((char *));
#endif
char *
setlocale(category, locale)
int category;
const char *locale;
{
int i, j, len;
char *env, *r;
if (category < LC_ALL || category >= _LC_LAST)
return (NULL);
if (!locale)
return (category != LC_ALL ?
current_categories[category] : currentlocale());
/*
* Default to the current locale for everything.
*/
for (i = 1; i < _LC_LAST; ++i)
(void)strcpy(new_categories[i], current_categories[i]);
/*
* Now go fill up new_categories from the locale argument
*/
if (!*locale) {
env = getenv(categories[category]);
if (category != LC_ALL && (!env || !*env))
env = getenv(categories[LC_ALL]);
if (!env || !*env)
env = getenv("LANG");
if (!env || !*env)
env = "C";
(void) strncpy(new_categories[category], env, 31);
new_categories[category][31] = 0;
if (category == LC_ALL) {
for (i = 1; i < _LC_LAST; ++i) {
if (!(env = getenv(categories[i])) || !*env)
env = new_categories[LC_ALL];
(void)strncpy(new_categories[i], env, 31);
new_categories[i][31] = 0;
}
}
} else if (category != LC_ALL) {
(void)strncpy(new_categories[category], locale, 31);
new_categories[category][31] = 0;
} else {
if ((r = strchr(locale, '/')) == 0) {
for (i = 1; i < _LC_LAST; ++i) {
(void)strncpy(new_categories[i], locale, 31);
new_categories[i][31] = 0;
}
} else {
for (i = 1; r[1] == '/'; ++r);
if (!r[1])
return (NULL); /* Hmm, just slashes... */
do {
len = r - locale > 31 ? 31 : r - locale;
(void)strncpy(new_categories[i++], locale, len);
new_categories[i++][len] = 0;
locale = r;
while (*locale == '/')
++locale;
while (*++r && *r != '/');
} while (*locale);
while (i < _LC_LAST)
(void)strcpy(new_categories[i],
new_categories[i-1]);
}
}
if (category)
return (loadlocale(category));
for (i = 1; i < _LC_LAST; ++i) {
(void)strcpy(saved_categories[i], current_categories[i]);
if (loadlocale(i) == NULL) {
for (j = 1; j < i; j++) {
(void)strcpy(new_categories[j],
saved_categories[j]);
/* XXX can fail too */
(void)loadlocale(j);
}
return (NULL);
}
}
return (currentlocale());
}
/* To be compatible with crt0 hack */
void
_startup_setlocale(category, locale)
int category;
const char *locale;
{
#ifndef XPG4
(void) setlocale(category, locale);
#endif
}
static char *
currentlocale()
{
int i;
(void)strcpy(current_locale_string, current_categories[1]);
for (i = 2; i < _LC_LAST; ++i)
if (strcmp(current_categories[1], current_categories[i])) {
(void) strcpy(current_locale_string, current_categories[1]);
(void) strcat(current_locale_string, "/");
(void) strcat(current_locale_string, current_categories[2]);
(void) strcat(current_locale_string, "/");
(void) strcat(current_locale_string, current_categories[3]);
(void) strcat(current_locale_string, "/");
(void) strcat(current_locale_string, current_categories[4]);
(void) strcat(current_locale_string, "/");
(void) strcat(current_locale_string, current_categories[5]);
break;
}
return (current_locale_string);
}
static char *
loadlocale(category)
int category;
{
char *ret;
char *new = new_categories[category];
char *old = current_categories[category];
if (!_PathLocale) {
if ( !(ret = getenv("PATH_LOCALE"))
|| getuid() != geteuid()
|| getgid() != getegid()
)
_PathLocale = _PATH_LOCALE;
else if ( strlen(ret) + 45 > PATH_MAX
|| !(_PathLocale = strdup(ret))
)
return (NULL);
}
if (strcmp(new, old) == 0)
return (old);
if (category == LC_CTYPE) {
#ifdef XPG4
ret = _xpg4_setrunelocale(new) ? NULL : new;
#else
ret = setrunelocale(new) ? NULL : new;
#endif
if (!ret) {
#ifdef XPG4
(void)_xpg4_setrunelocale(old);
#else
(void)setrunelocale(old);
#endif
} else
(void)strcpy(old, new);
return (ret);
}
if (category == LC_COLLATE) {
ret = (__collate_load_tables(new) < 0) ? NULL : new;
if (!ret)
(void)__collate_load_tables(old);
else
(void)strcpy(old, new);
return (ret);
}
if (category == LC_TIME) {
ret = (__time_load_locale(new) < 0) ? NULL : new;
if (!ret)
(void)__time_load_locale(old);
else
(void)strcpy(old, new);
return (ret);
}
if (category == LC_MONETARY || category == LC_NUMERIC) {
ret = stub_load_locale(new) ? NULL : new;
if (!ret)
(void)stub_load_locale(old);
else
(void)strcpy(old, new);
return (ret);
}
/* Just in case...*/
return (NULL);
}
static int
stub_load_locale(encoding)
const char *encoding;
{
char name[PATH_MAX];
struct stat st;
if (!encoding)
return(1);
/*
* The "C" and "POSIX" locale are always here.
*/
if (!strcmp(encoding, "C") || !strcmp(encoding, "POSIX"))
return(0);
if (!_PathLocale)
return(1);
/* Range checking already done at upper level caller */
strcpy(name, _PathLocale);
strcat(name, "/");
strcat(name, encoding);
#if 0
/*
* Some day we will actually look at this file.
*/
#endif
return (stat(name, &st) != 0 || !S_ISDIR(st.st_mode));
}