setlocale.c revision 101498 
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 101498 2002-08-08 05:51:54Z 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 <rune.h>
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 * The locales we are going to try and load
89 */
90static char new_categories[_LC_LAST][ENCODING_LEN + 1];
91static char saved_categories[_LC_LAST][ENCODING_LEN + 1];
92
93static char current_locale_string[_LC_LAST * (ENCODING_LEN + 1/*"/"*/ + 1)];
94
95static char	*currentlocale(void);
96static int	wrap_setrunelocale(const char *);
97static char	*loadlocale(int);
98
99char *
100setlocale(category, locale)
101	int category;
102	const char *locale;
103{
104	int i, j, len, saverr;
105	char *env, *r;
106
107	if (category < LC_ALL || category >= _LC_LAST) {
108		errno = EINVAL;
109		return (NULL);
110	}
111
112	if (locale == NULL)
113		return (category != LC_ALL ?
114		    current_categories[category] : currentlocale());
115
116	/*
117	 * Default to the current locale for everything.
118	 */
119	for (i = 1; i < _LC_LAST; ++i)
120		(void)strcpy(new_categories[i], current_categories[i]);
121
122	/*
123	 * Now go fill up new_categories from the locale argument
124	 */
125	if (!*locale) {
126		env = getenv("LC_ALL");
127
128		if (category != LC_ALL && (env == NULL || !*env))
129			env = getenv(categories[category]);
130
131		if (env == NULL || !*env)
132			env = getenv("LANG");
133
134		if (env == NULL || !*env)
135			env = "C";
136
137		if (strlen(env) > ENCODING_LEN) {
138			errno = EINVAL;
139			return (NULL);
140		}
141		(void)strcpy(new_categories[category], env);
142
143		if (category == LC_ALL) {
144			for (i = 1; i < _LC_LAST; ++i) {
145				if ((env = getenv(categories[i])) == NULL ||
146				    !*env)
147					env = new_categories[LC_ALL];
148				else if (strlen(env) > ENCODING_LEN) {
149					errno = EINVAL;
150					return (NULL);
151				}
152				(void)strcpy(new_categories[i], env);
153			}
154		}
155	} else if (category != LC_ALL) {
156		if (strlen(locale) > ENCODING_LEN) {
157			errno = EINVAL;
158			return (NULL);
159		}
160		(void)strcpy(new_categories[category], locale);
161	} else {
162		if ((r = strchr(locale, '/')) == NULL) {
163			if (strlen(locale) > ENCODING_LEN) {
164				errno = EINVAL;
165				return (NULL);
166			}
167			for (i = 1; i < _LC_LAST; ++i)
168				(void)strcpy(new_categories[i], locale);
169		} else {
170			for (i = 1; r[1] == '/'; ++r)
171				;
172			if (!r[1]) {
173				errno = EINVAL;
174				return (NULL);	/* Hmm, just slashes... */
175			}
176			do {
177				if (i == _LC_LAST)
178					break;  /* Too many slashes... */
179				if ((len = r - locale) > ENCODING_LEN) {
180					errno = EINVAL;
181					return (NULL);
182				}
183				(void)strlcpy(new_categories[i], locale,
184					      len + 1);
185				i++;
186				locale = r;
187				while (*locale == '/')
188					++locale;
189				while (*++r && *r != '/')
190					;
191			} while (*locale);
192			while (i < _LC_LAST) {
193				(void)strcpy(new_categories[i],
194					     new_categories[i-1]);
195				i++;
196			}
197		}
198	}
199
200	if (category != LC_ALL)
201		return (loadlocale(category));
202
203	for (i = 1; i < _LC_LAST; ++i) {
204		(void)strcpy(saved_categories[i], current_categories[i]);
205		if (loadlocale(i) == NULL) {
206			saverr = errno;
207			for (j = 1; j < i; j++) {
208				(void)strcpy(new_categories[j],
209					     saved_categories[j]);
210				if (loadlocale(j) == NULL) {
211					(void)strcpy(new_categories[j], "C");
212					(void)loadlocale(j);
213				}
214			}
215			errno = saverr;
216			return (NULL);
217		}
218	}
219	return (currentlocale());
220}
221
222static char *
223currentlocale()
224{
225	int i;
226
227	(void)strcpy(current_locale_string, current_categories[1]);
228
229	for (i = 2; i < _LC_LAST; ++i)
230		if (strcmp(current_categories[1], current_categories[i])) {
231			for (i = 2; i < _LC_LAST; ++i) {
232				(void)strcat(current_locale_string, "/");
233				(void)strcat(current_locale_string,
234					     current_categories[i]);
235			}
236			break;
237		}
238	return (current_locale_string);
239}
240
241static int
242wrap_setrunelocale(const char *locale)
243{
244	int ret = setrunelocale((char *)locale);
245
246	if (ret != 0) {
247		errno = ret;
248		return (_LDP_ERROR);
249	}
250	return (_LDP_LOADED);
251}
252
253static char *
254loadlocale(category)
255	int category;
256{
257	char *new = new_categories[category];
258	char *old = current_categories[category];
259	int (*func)(const char *);
260
261	if ((new[0] == '.' &&
262	     (new[1] == '\0' || (new[1] == '.' && new[2] == '\0'))) ||
263	    strchr(new, '/') != NULL) {
264		errno = EINVAL;
265		return (NULL);
266	}
267
268	if (_PathLocale == NULL) {
269		char *p = getenv("PATH_LOCALE");
270
271		if (p != NULL
272#ifndef __NETBSD_SYSCALLS
273			&& !issetugid()
274#endif
275			) {
276			if (strlen(p) + 1/*"/"*/ + ENCODING_LEN +
277			    1/*"/"*/ + CATEGORY_LEN >= PATH_MAX) {
278				errno = ENAMETOOLONG;
279				return (NULL);
280			}
281			_PathLocale = strdup(p);
282			if (_PathLocale == NULL) {
283				errno = ENOMEM;
284				return (NULL);
285			}
286		} else
287			_PathLocale = _PATH_LOCALE;
288	}
289
290	switch (category) {
291	case LC_CTYPE:
292		func = wrap_setrunelocale;
293		break;
294	case LC_COLLATE:
295		func = __collate_load_tables;
296		break;
297	case LC_TIME:
298		func = __time_load_locale;
299		break;
300	case LC_NUMERIC:
301		func = __numeric_load_locale;
302		break;
303	case LC_MONETARY:
304		func = __monetary_load_locale;
305		break;
306	case LC_MESSAGES:
307		func = __messages_load_locale;
308		break;
309	default:
310		errno = EINVAL;
311		return (NULL);
312	}
313
314	if (strcmp(new, old) == 0)
315		return (old);
316
317	if (func(new) != _LDP_ERROR) {
318		(void)strcpy(old, new);
319		return (old);
320	}
321
322	return (NULL);
323}
324
325