setlocale.c revision 65603 
1/*
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Paul Borman at Krystal Technologies.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * $FreeBSD: head/lib/libc/locale/setlocale.c 65603 2000-09-08 07:29:48Z kris $
37 */
38
39#ifdef LIBC_RCS
40static const char rcsid[] =
41  "$FreeBSD: head/lib/libc/locale/setlocale.c 65603 2000-09-08 07:29:48Z kris $";
42#endif
43
44#if defined(LIBC_SCCS) && !defined(lint)
45static char sccsid[] = "@(#)setlocale.c	8.1 (Berkeley) 7/4/93";
46#endif /* LIBC_SCCS and not lint */
47
48#include <sys/types.h>
49#include <sys/stat.h>
50#include <limits.h>
51#include <locale.h>
52#include <rune.h>
53#include <stdlib.h>
54#include <string.h>
55#include <unistd.h>
56#include "collate.h"
57#include "setlocale.h"
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 __P((void));
94static char	*loadlocale __P((int));
95static int      stub_load_locale __P((const char *));
96
97extern int __time_load_locale __P((const char *)); /* strftime.c */
98
99char *
100setlocale(category, locale)
101	int category;
102	const char *locale;
103{
104	int i, j, len;
105	char *env, *r;
106
107	if (category < LC_ALL || category >= _LC_LAST)
108		return (NULL);
109
110	if (!locale)
111		return (category != LC_ALL ?
112		    current_categories[category] : currentlocale());
113
114	/*
115	 * Default to the current locale for everything.
116	 */
117	for (i = 1; i < _LC_LAST; ++i)
118		(void)strcpy(new_categories[i], current_categories[i]);
119
120	/*
121	 * Now go fill up new_categories from the locale argument
122	 */
123	if (!*locale) {
124		env = getenv(categories[category]);
125
126		if (category != LC_ALL && (!env || !*env))
127			env = getenv(categories[LC_ALL]);
128
129		if (!env || !*env)
130			env = getenv("LANG");
131
132		if (!env || !*env || strchr(env, '/'))
133			env = "C";
134
135		(void) strncpy(new_categories[category], env, ENCODING_LEN);
136		new_categories[category][ENCODING_LEN] = '\0';
137		if (category == LC_ALL) {
138			for (i = 1; i < _LC_LAST; ++i) {
139				if (!(env = getenv(categories[i])) || !*env)
140					env = new_categories[LC_ALL];
141				(void)strncpy(new_categories[i], env, ENCODING_LEN);
142				new_categories[i][ENCODING_LEN] = '\0';
143			}
144		}
145	} else if (category != LC_ALL)  {
146		(void)strncpy(new_categories[category], locale, ENCODING_LEN);
147		new_categories[category][ENCODING_LEN] = '\0';
148	} else {
149		if ((r = strchr(locale, '/')) == NULL) {
150			for (i = 1; i < _LC_LAST; ++i) {
151				(void)strncpy(new_categories[i], locale, ENCODING_LEN);
152				new_categories[i][ENCODING_LEN] = '\0';
153			}
154		} else {
155			for (i = 1; r[1] == '/'; ++r);
156			if (!r[1])
157				return (NULL);	/* Hmm, just slashes... */
158			do {
159				len = r - locale > ENCODING_LEN ? ENCODING_LEN : r - locale;
160				(void)strncpy(new_categories[i], locale, len);
161				new_categories[i][len] = '\0';
162				i++;
163				locale = r;
164				while (*locale == '/')
165				    ++locale;
166				while (*++r && *r != '/');
167			} while (*locale);
168			while (i < _LC_LAST) {
169				(void)strcpy(new_categories[i],
170				    new_categories[i-1]);
171				i++;
172			}
173		}
174	}
175
176	if (category != LC_ALL)
177		return (loadlocale(category));
178
179	for (i = 1; i < _LC_LAST; ++i) {
180		(void)strcpy(saved_categories[i], current_categories[i]);
181		if (loadlocale(i) == NULL) {
182			for (j = 1; j < i; j++) {
183				(void)strcpy(new_categories[j],
184				     saved_categories[j]);
185				/* XXX can fail too */
186				(void)loadlocale(j);
187			}
188			return (NULL);
189		}
190	}
191	return (currentlocale());
192}
193
194static char *
195currentlocale()
196{
197	int i;
198
199	(void)strcpy(current_locale_string, current_categories[1]);
200
201	for (i = 2; i < _LC_LAST; ++i)
202		if (strcmp(current_categories[1], current_categories[i])) {
203			for (i = 2; i < _LC_LAST; ++i) {
204				(void) strcat(current_locale_string, "/");
205				(void) strcat(current_locale_string, current_categories[i]);
206			}
207			break;
208		}
209	return (current_locale_string);
210}
211
212static char *
213loadlocale(category)
214	int category;
215{
216	char *ret;
217	char *new = new_categories[category];
218	char *old = current_categories[category];
219
220	if (_PathLocale == NULL) {
221		char *p = getenv("PATH_LOCALE");
222
223		if (p != NULL
224#ifndef __NETBSD_SYSCALLS
225			&& !issetugid()
226#endif
227			) {
228			if (strlen(p) + 1/*"/"*/ + ENCODING_LEN +
229			    1/*"/"*/ + CATEGORY_LEN >= PATH_MAX)
230				return (NULL);
231			_PathLocale = strdup(p);
232			if (_PathLocale == NULL)
233				return (NULL);
234		} else
235			_PathLocale = _PATH_LOCALE;
236	}
237
238	if (strcmp(new, old) == 0)
239		return (old);
240
241	if (category == LC_CTYPE) {
242		ret = setrunelocale(new) ? NULL : new;
243		if (!ret)
244			(void)setrunelocale(old);
245		else
246			(void)strcpy(old, new);
247		return (ret);
248	}
249
250	if (category == LC_COLLATE) {
251		ret = (__collate_load_tables(new) < 0) ? NULL : new;
252		if (!ret)
253			(void)__collate_load_tables(old);
254		else
255			(void)strcpy(old, new);
256		return (ret);
257	}
258
259	if (category == LC_TIME) {
260		ret = (__time_load_locale(new) < 0) ? NULL : new;
261		if (!ret)
262			(void)__time_load_locale(old);
263		else
264			(void)strcpy(old, new);
265		return (ret);
266	}
267
268	if (category == LC_MONETARY ||
269	    category == LC_MESSAGES ||
270	    category == LC_NUMERIC) {
271		ret = stub_load_locale(new) ? NULL : new;
272		if (!ret)
273			(void)stub_load_locale(old);
274		else
275			(void)strcpy(old, new);
276		return (ret);
277	}
278
279	/* Just in case...*/
280	return (NULL);
281}
282
283static int
284stub_load_locale(encoding)
285const char *encoding;
286{
287	char name[PATH_MAX];
288	struct stat st;
289
290	if (!encoding)
291		return(1);
292	/*
293	 * The "C" and "POSIX" locale are always here.
294	 */
295	if (!strcmp(encoding, "C") || !strcmp(encoding, "POSIX"))
296		return(0);
297	if (!_PathLocale)
298		return(1);
299	/* Range checking not needed, encoding has fixed size */
300	strcpy(name, _PathLocale);
301	strcat(name, "/");
302	strcat(name, encoding);
303#if 0
304	/*
305	 * Some day we will actually look at this file.
306	 */
307#endif
308	return (stat(name, &st) != 0 || !S_ISDIR(st.st_mode));
309}
310