setlocale.c revision 125274 
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 125274 2004-01-31 19:15:32Z 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);
102static const char *__get_locale_env(int);
103
104char *
105setlocale(category, locale)
106	int category;
107	const char *locale;
108{
109	int i, j, len, saverr;
110        const char *env, *r;
111
112	if (category < LC_ALL || category >= _LC_LAST) {
113		errno = EINVAL;
114		return (NULL);
115	}
116
117	if (locale == NULL)
118		return (category != LC_ALL ?
119		    current_categories[category] : currentlocale());
120
121	/*
122	 * Default to the current locale for everything.
123	 */
124	for (i = 1; i < _LC_LAST; ++i)
125		(void)strcpy(new_categories[i], current_categories[i]);
126
127	/*
128	 * Now go fill up new_categories from the locale argument
129	 */
130	if (!*locale) {
131		if (category == LC_ALL) {
132			for (i = 1; i < _LC_LAST; ++i) {
133				env = __get_locale_env(i);
134				if (strlen(env) > ENCODING_LEN) {
135					errno = EINVAL;
136					return (NULL);
137				}
138				(void)strcpy(new_categories[i], env);
139			}
140		} else {
141			env = __get_locale_env(category);
142			if (strlen(env) > ENCODING_LEN) {
143				errno = EINVAL;
144				return (NULL);
145			}
146			(void)strcpy(new_categories[category], env);
147		}
148	} else if (category != LC_ALL) {
149		if (strlen(locale) > ENCODING_LEN) {
150			errno = EINVAL;
151			return (NULL);
152		}
153		(void)strcpy(new_categories[category], locale);
154	} else {
155		if ((r = strchr(locale, '/')) == NULL) {
156			if (strlen(locale) > ENCODING_LEN) {
157				errno = EINVAL;
158				return (NULL);
159			}
160			for (i = 1; i < _LC_LAST; ++i)
161				(void)strcpy(new_categories[i], locale);
162		} else {
163			for (i = 1; r[1] == '/'; ++r)
164				;
165			if (!r[1]) {
166				errno = EINVAL;
167				return (NULL);	/* Hmm, just slashes... */
168			}
169			do {
170				if (i == _LC_LAST)
171					break;  /* Too many slashes... */
172				if ((len = r - locale) > ENCODING_LEN) {
173					errno = EINVAL;
174					return (NULL);
175				}
176				(void)strlcpy(new_categories[i], locale,
177					      len + 1);
178				i++;
179				while (*r == '/')
180					r++;
181				locale = r;
182				while (*r && *r != '/')
183					r++;
184			} while (*locale);
185			while (i < _LC_LAST) {
186				(void)strcpy(new_categories[i],
187					     new_categories[i-1]);
188				i++;
189			}
190		}
191	}
192
193	if (category != LC_ALL)
194		return (loadlocale(category));
195
196	for (i = 1; i < _LC_LAST; ++i) {
197		(void)strcpy(saved_categories[i], current_categories[i]);
198		if (loadlocale(i) == NULL) {
199			saverr = errno;
200			for (j = 1; j < i; j++) {
201				(void)strcpy(new_categories[j],
202					     saved_categories[j]);
203				if (loadlocale(j) == NULL) {
204					(void)strcpy(new_categories[j], "C");
205					(void)loadlocale(j);
206				}
207			}
208			errno = saverr;
209			return (NULL);
210		}
211	}
212	return (currentlocale());
213}
214
215static char *
216currentlocale()
217{
218	int i;
219
220	(void)strcpy(current_locale_string, current_categories[1]);
221
222	for (i = 2; i < _LC_LAST; ++i)
223		if (strcmp(current_categories[1], current_categories[i])) {
224			for (i = 2; i < _LC_LAST; ++i) {
225				(void)strcat(current_locale_string, "/");
226				(void)strcat(current_locale_string,
227					     current_categories[i]);
228			}
229			break;
230		}
231	return (current_locale_string);
232}
233
234static char *
235loadlocale(category)
236	int category;
237{
238	char *new = new_categories[category];
239	char *old = current_categories[category];
240	int (*func)(const char *);
241	int saved_errno;
242
243	if ((new[0] == '.' &&
244	     (new[1] == '\0' || (new[1] == '.' && new[2] == '\0'))) ||
245	    strchr(new, '/') != NULL) {
246		errno = EINVAL;
247		return (NULL);
248	}
249
250	saved_errno = errno;
251	errno = __detect_path_locale();
252	if (errno != 0)
253		return (NULL);
254	errno = saved_errno;
255
256	switch (category) {
257	case LC_CTYPE:
258		func = __wrap_setrunelocale;
259		break;
260	case LC_COLLATE:
261		func = __collate_load_tables;
262		break;
263	case LC_TIME:
264		func = __time_load_locale;
265		break;
266	case LC_NUMERIC:
267		func = __numeric_load_locale;
268		break;
269	case LC_MONETARY:
270		func = __monetary_load_locale;
271		break;
272	case LC_MESSAGES:
273		func = __messages_load_locale;
274		break;
275	default:
276		errno = EINVAL;
277		return (NULL);
278	}
279
280	if (strcmp(new, old) == 0)
281		return (old);
282
283	if (func(new) != _LDP_ERROR) {
284		(void)strcpy(old, new);
285		return (old);
286	}
287
288	return (NULL);
289}
290
291static const char *
292__get_locale_env(category)
293        int category;
294{
295        const char *env;
296
297        /* 1. check LC_ALL. */
298        env = getenv(categories[0]);
299
300        /* 2. check LC_* */
301	if (env == NULL || !*env)
302                env = getenv(categories[category]);
303
304        /* 3. check LANG */
305	if (env == NULL || !*env)
306                env = getenv("LANG");
307
308        /* 4. if none is set, fall to "C" */
309	if (env == NULL || !*env)
310                env = "C";
311
312	return (env);
313}
314
315/*
316 * Detect locale storage location and store its value to _PathLocale variable
317 */
318int
319__detect_path_locale(void)
320{
321	if (_PathLocale == NULL) {
322		char *p = getenv("PATH_LOCALE");
323
324		if (p != NULL && !issetugid()) {
325			if (strlen(p) + 1/*"/"*/ + ENCODING_LEN +
326			    1/*"/"*/ + CATEGORY_LEN >= PATH_MAX)
327				return (ENAMETOOLONG);
328			_PathLocale = strdup(p);
329			if (_PathLocale == NULL)
330				return (errno == 0 ? ENOMEM : errno);
331		} else
332			_PathLocale = _PATH_LOCALE;
333	}
334	return (0);
335}
336
337