setlocale.c revision 123801 
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 123801 2003-12-24 10:16:46Z ache $");
43
44#include <sys/types.h>
45#include <sys/stat.h>
46#include <errno.h>
47#include <limits.h>
48#include <locale.h>
49#include <paths.h>	/* for _PATH_LOCALE */
50#include <stdlib.h>
51#include <string.h>
52#include <unistd.h>
53#include "collate.h"
54#include "lmonetary.h"	/* for __monetary_load_locale() */
55#include "lnumeric.h"	/* for __numeric_load_locale() */
56#include "lmessages.h"	/* for __messages_load_locale() */
57#include "setlocale.h"
58#include "ldpart.h"
59#include "../stdtime/timelocal.h" /* for __time_load_locale() */
60
61/*
62 * Category names for getenv()
63 */
64static char *categories[_LC_LAST] = {
65    "LC_ALL",
66    "LC_COLLATE",
67    "LC_CTYPE",
68    "LC_MONETARY",
69    "LC_NUMERIC",
70    "LC_TIME",
71    "LC_MESSAGES",
72};
73
74/*
75 * Current locales for each category
76 */
77static char current_categories[_LC_LAST][ENCODING_LEN + 1] = {
78    "C",
79    "C",
80    "C",
81    "C",
82    "C",
83    "C",
84    "C",
85};
86
87/*
88 * Path to locale storage directory
89 */
90char	*_PathLocale;
91
92/*
93 * The locales we are going to try and load
94 */
95static char new_categories[_LC_LAST][ENCODING_LEN + 1];
96static char saved_categories[_LC_LAST][ENCODING_LEN + 1];
97
98static char current_locale_string[_LC_LAST * (ENCODING_LEN + 1/*"/"*/ + 1)];
99
100static char	*currentlocale(void);
101static char	*loadlocale(int);
102
103char *
104setlocale(category, locale)
105	int category;
106	const char *locale;
107{
108	int i, j, len, saverr;
109	char *env, *r;
110
111	if (category < LC_ALL || category >= _LC_LAST) {
112		errno = EINVAL;
113		return (NULL);
114	}
115
116	if (locale == NULL)
117		return (category != LC_ALL ?
118		    current_categories[category] : currentlocale());
119
120	/*
121	 * Default to the current locale for everything.
122	 */
123	for (i = 1; i < _LC_LAST; ++i)
124		(void)strcpy(new_categories[i], current_categories[i]);
125
126	/*
127	 * Now go fill up new_categories from the locale argument
128	 */
129	if (!*locale) {
130		env = getenv("LC_ALL");
131
132		if (category != LC_ALL && (env == NULL || !*env))
133			env = getenv(categories[category]);
134
135		if (env == NULL || !*env)
136			env = getenv("LANG");
137
138		if (env == NULL || !*env)
139			env = "C";
140
141		if (strlen(env) > ENCODING_LEN) {
142			errno = EINVAL;
143			return (NULL);
144		}
145		(void)strcpy(new_categories[category], env);
146
147		if (category == LC_ALL) {
148			for (i = 1; i < _LC_LAST; ++i) {
149				if ((env = getenv(categories[i])) == NULL ||
150				    !*env)
151					env = new_categories[LC_ALL];
152				else if (strlen(env) > ENCODING_LEN) {
153					errno = EINVAL;
154					return (NULL);
155				}
156				(void)strcpy(new_categories[i], env);
157			}
158		}
159	} else if (category != LC_ALL) {
160		if (strlen(locale) > ENCODING_LEN) {
161			errno = EINVAL;
162			return (NULL);
163		}
164		(void)strcpy(new_categories[category], locale);
165	} else {
166		if ((r = strchr(locale, '/')) == NULL) {
167			if (strlen(locale) > ENCODING_LEN) {
168				errno = EINVAL;
169				return (NULL);
170			}
171			for (i = 1; i < _LC_LAST; ++i)
172				(void)strcpy(new_categories[i], locale);
173		} else {
174			for (i = 1; r[1] == '/'; ++r)
175				;
176			if (!r[1]) {
177				errno = EINVAL;
178				return (NULL);	/* Hmm, just slashes... */
179			}
180			do {
181				if (i == _LC_LAST)
182					break;  /* Too many slashes... */
183				if ((len = r - locale) > ENCODING_LEN) {
184					errno = EINVAL;
185					return (NULL);
186				}
187				(void)strlcpy(new_categories[i], locale,
188					      len + 1);
189				i++;
190				while (*r == '/')
191					r++;
192				locale = r;
193				while (*r && *r != '/')
194					r++;
195			} while (*locale);
196			while (i < _LC_LAST) {
197				(void)strcpy(new_categories[i],
198					     new_categories[i-1]);
199				i++;
200			}
201		}
202	}
203
204	if (category != LC_ALL)
205		return (loadlocale(category));
206
207	for (i = 1; i < _LC_LAST; ++i) {
208		(void)strcpy(saved_categories[i], current_categories[i]);
209		if (loadlocale(i) == NULL) {
210			saverr = errno;
211			for (j = 1; j < i; j++) {
212				(void)strcpy(new_categories[j],
213					     saved_categories[j]);
214				if (loadlocale(j) == NULL) {
215					(void)strcpy(new_categories[j], "C");
216					(void)loadlocale(j);
217				}
218			}
219			errno = saverr;
220			return (NULL);
221		}
222	}
223	return (currentlocale());
224}
225
226static char *
227currentlocale()
228{
229	int i;
230
231	(void)strcpy(current_locale_string, current_categories[1]);
232
233	for (i = 2; i < _LC_LAST; ++i)
234		if (strcmp(current_categories[1], current_categories[i])) {
235			for (i = 2; i < _LC_LAST; ++i) {
236				(void)strcat(current_locale_string, "/");
237				(void)strcat(current_locale_string,
238					     current_categories[i]);
239			}
240			break;
241		}
242	return (current_locale_string);
243}
244
245static char *
246loadlocale(category)
247	int category;
248{
249	char *new = new_categories[category];
250	char *old = current_categories[category];
251	int (*func)(const char *);
252	int saved_errno;
253
254	if ((new[0] == '.' &&
255	     (new[1] == '\0' || (new[1] == '.' && new[2] == '\0'))) ||
256	    strchr(new, '/') != NULL) {
257		errno = EINVAL;
258		return (NULL);
259	}
260
261	saved_errno = errno;
262	errno = __detect_path_locale();
263	if (errno != 0)
264		return (NULL);
265	errno = saved_errno;
266
267	switch (category) {
268	case LC_CTYPE:
269		func = __wrap_setrunelocale;
270		break;
271	case LC_COLLATE:
272		func = __collate_load_tables;
273		break;
274	case LC_TIME:
275		func = __time_load_locale;
276		break;
277	case LC_NUMERIC:
278		func = __numeric_load_locale;
279		break;
280	case LC_MONETARY:
281		func = __monetary_load_locale;
282		break;
283	case LC_MESSAGES:
284		func = __messages_load_locale;
285		break;
286	default:
287		errno = EINVAL;
288		return (NULL);
289	}
290
291	if (strcmp(new, old) == 0)
292		return (old);
293
294	if (func(new) != _LDP_ERROR) {
295		(void)strcpy(old, new);
296		return (old);
297	}
298
299	return (NULL);
300}
301
302/*
303 * Detect locale storage location and store its value to _PathLocale variable
304 */
305int
306__detect_path_locale(void)
307{
308	if (_PathLocale == NULL) {
309		char *p = getenv("PATH_LOCALE");
310
311		if (p != NULL && !issetugid()) {
312			if (strlen(p) + 1/*"/"*/ + ENCODING_LEN +
313			    1/*"/"*/ + CATEGORY_LEN >= PATH_MAX)
314				return (ENAMETOOLONG);
315			_PathLocale = strdup(p);
316			if (_PathLocale == NULL)
317				return (errno == 0 ? ENOMEM : errno);
318		} else
319			_PathLocale = _PATH_LOCALE;
320	}
321	return (0);
322}
323
324