setlocale.c revision 101193 
1/*
2 * Copyright (c) 1996 - 2002 FreeBSD Project
3 * Copyright (c) 1991, 1993
4 *	The Regents of the University of California.  All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Paul Borman at Krystal Technologies.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 *    must display the following acknowledgement:
19 *	This product includes software developed by the University of
20 *	California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 *    may be used to endorse or promote products derived from this software
23 *    without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 */
37
38#if defined(LIBC_SCCS) && !defined(lint)
39static char sccsid[] = "@(#)setlocale.c	8.1 (Berkeley) 7/4/93";
40#endif /* LIBC_SCCS and not lint */
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD: head/lib/libc/locale/setlocale.c 101193 2002-08-02 01:04:49Z ache $");
43
44#include <sys/types.h>
45#include <sys/stat.h>
46#include <limits.h>
47#include <locale.h>
48#include <rune.h>
49#include <stdlib.h>
50#include <string.h>
51#include <unistd.h>
52#include "collate.h"
53#include "lmonetary.h"	/* for __monetary_load_locale() */
54#include "lnumeric.h"	/* for __numeric_load_locale() */
55#include "lmessages.h"	/* for __messages_load_locale() */
56#include "setlocale.h"
57#include "../stdtime/timelocal.h" /* for __time_load_locale() */
58
59/*
60 * Category names for getenv()
61 */
62static char *categories[_LC_LAST] = {
63    "LC_ALL",
64    "LC_COLLATE",
65    "LC_CTYPE",
66    "LC_MONETARY",
67    "LC_NUMERIC",
68    "LC_TIME",
69    "LC_MESSAGES",
70};
71
72/*
73 * Current locales for each category
74 */
75static char current_categories[_LC_LAST][ENCODING_LEN + 1] = {
76    "C",
77    "C",
78    "C",
79    "C",
80    "C",
81    "C",
82    "C",
83};
84
85/*
86 * The locales we are going to try and load
87 */
88static char new_categories[_LC_LAST][ENCODING_LEN + 1];
89static char saved_categories[_LC_LAST][ENCODING_LEN + 1];
90
91static char current_locale_string[_LC_LAST * (ENCODING_LEN + 1/*"/"*/ + 1)];
92
93static char	*currentlocale(void);
94static char	*loadlocale(int);
95
96char *
97setlocale(category, locale)
98	int category;
99	const char *locale;
100{
101	int i, j, len;
102	char *env, *r;
103
104	if (category < LC_ALL || category >= _LC_LAST)
105		return (NULL);
106
107	if (!locale)
108		return (category != LC_ALL ?
109		    current_categories[category] : currentlocale());
110
111	/*
112	 * Default to the current locale for everything.
113	 */
114	for (i = 1; i < _LC_LAST; ++i)
115		(void)strcpy(new_categories[i], current_categories[i]);
116
117	/*
118	 * Now go fill up new_categories from the locale argument
119	 */
120	if (!*locale) {
121		env = getenv("LC_ALL");
122
123		if (category != LC_ALL && (!env || !*env))
124			env = getenv(categories[category]);
125
126		if (!env || !*env)
127			env = getenv("LANG");
128
129		if (!env || !*env || strchr(env, '/'))
130			env = "C";
131
132		(void)strlcpy(new_categories[category], env, ENCODING_LEN + 1);
133		if (category == LC_ALL) {
134			for (i = 1; i < _LC_LAST; ++i) {
135				if (!(env = getenv(categories[i])) || !*env)
136					env = new_categories[LC_ALL];
137				(void)strlcpy(new_categories[i], env, ENCODING_LEN + 1);
138			}
139		}
140	} else if (category != LC_ALL)
141		(void)strlcpy(new_categories[category], locale, ENCODING_LEN + 1);
142	else {
143		if ((r = strchr(locale, '/')) == NULL) {
144			for (i = 1; i < _LC_LAST; ++i)
145				(void)strlcpy(new_categories[i], locale, ENCODING_LEN + 1);
146		} else {
147			for (i = 1; r[1] == '/'; ++r);
148			if (!r[1])
149				return (NULL);	/* Hmm, just slashes... */
150			do {
151				if (i == _LC_LAST)
152					return(NULL); /* Too many slashes... */
153				len = r - locale > ENCODING_LEN ? ENCODING_LEN : r - locale;
154				(void)strlcpy(new_categories[i], locale, len + 1);
155				i++;
156				locale = r;
157				while (*locale == '/')
158				    ++locale;
159				while (*++r && *r != '/');
160			} while (*locale);
161			while (i < _LC_LAST) {
162				(void)strcpy(new_categories[i],
163				    new_categories[i-1]);
164				i++;
165			}
166		}
167	}
168
169	if (category != LC_ALL)
170		return (loadlocale(category));
171
172	for (i = 1; i < _LC_LAST; ++i) {
173		(void)strcpy(saved_categories[i], current_categories[i]);
174		if (loadlocale(i) == NULL) {
175			for (j = 1; j < i; j++) {
176				(void)strcpy(new_categories[j],
177				     saved_categories[j]);
178				/* XXX can fail too */
179				(void)loadlocale(j);
180			}
181			return (NULL);
182		}
183	}
184	return (currentlocale());
185}
186
187static char *
188currentlocale()
189{
190	int i;
191
192	(void)strcpy(current_locale_string, current_categories[1]);
193
194	for (i = 2; i < _LC_LAST; ++i)
195		if (strcmp(current_categories[1], current_categories[i])) {
196			for (i = 2; i < _LC_LAST; ++i) {
197				(void) strcat(current_locale_string, "/");
198				(void) strcat(current_locale_string, current_categories[i]);
199			}
200			break;
201		}
202	return (current_locale_string);
203}
204
205static char *
206loadlocale(category)
207	int category;
208{
209	char *ret;
210	char *new = new_categories[category];
211	char *old = current_categories[category];
212
213	if (_PathLocale == NULL) {
214		char *p = getenv("PATH_LOCALE");
215
216		if (p != NULL
217#ifndef __NETBSD_SYSCALLS
218			&& !issetugid()
219#endif
220			) {
221			if (strlen(p) + 1/*"/"*/ + ENCODING_LEN +
222			    1/*"/"*/ + CATEGORY_LEN >= PATH_MAX)
223				return (NULL);
224			_PathLocale = strdup(p);
225			if (_PathLocale == NULL)
226				return (NULL);
227		} else
228			_PathLocale = _PATH_LOCALE;
229	}
230
231	if (strcmp(new, old) == 0)
232		return (old);
233
234	if (category == LC_CTYPE) {
235		ret = setrunelocale(new) ? NULL : new;
236		if (!ret)
237			(void)setrunelocale(old);
238		else
239			(void)strcpy(old, new);
240		return (ret);
241	}
242
243#define LOAD_CATEGORY(CAT, FUNC)			\
244	if (category == CAT) {				\
245		ret = (FUNC(new) < 0) ? NULL : new;	\
246		if (!ret)				\
247			(void)FUNC(old);		\
248		else					\
249			(void)strcpy(old, new);		\
250		return (ret);				\
251	}
252
253	LOAD_CATEGORY(LC_COLLATE, __collate_load_tables);
254	LOAD_CATEGORY(LC_TIME, __time_load_locale);
255	LOAD_CATEGORY(LC_NUMERIC, __numeric_load_locale);
256	LOAD_CATEGORY(LC_MONETARY, __monetary_load_locale);
257	LOAD_CATEGORY(LC_MESSAGES, __messages_load_locale);
258
259	/* Just in case...*/
260	return (NULL);
261}
262
263