setlocale.c revision 114256 
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 114256 2003-04-29 21:13:50Z nectar $");
43
44#include "namespace.h"
45#include <sys/types.h>
46#include <sys/stat.h>
47#include <errno.h>
48#include <limits.h>
49#include <locale.h>
50#include <rune.h>
51#include <stdlib.h>
52#include <string.h>
53#include <unistd.h>
54#include "un-namespace.h"
55#include "collate.h"
56#include "lmonetary.h"	/* for __monetary_load_locale() */
57#include "lnumeric.h"	/* for __numeric_load_locale() */
58#include "lmessages.h"	/* for __messages_load_locale() */
59#include "setlocale.h"
60#include "ldpart.h"
61#include "../stdtime/timelocal.h" /* for __time_load_locale() */
62
63/*
64 * Category names for getenv()
65 */
66static char *categories[_LC_LAST] = {
67    "LC_ALL",
68    "LC_COLLATE",
69    "LC_CTYPE",
70    "LC_MONETARY",
71    "LC_NUMERIC",
72    "LC_TIME",
73    "LC_MESSAGES",
74};
75
76/*
77 * Current locales for each category
78 */
79static char current_categories[_LC_LAST][ENCODING_LEN + 1] = {
80    "C",
81    "C",
82    "C",
83    "C",
84    "C",
85    "C",
86    "C",
87};
88
89/*
90 * The locales we are going to try and load
91 */
92static char new_categories[_LC_LAST][ENCODING_LEN + 1];
93static char saved_categories[_LC_LAST][ENCODING_LEN + 1];
94
95static char current_locale_string[_LC_LAST * (ENCODING_LEN + 1/*"/"*/ + 1)];
96
97static char	*currentlocale(void);
98static int	wrap_setrunelocale(const char *);
99static char	*loadlocale(int);
100
101char *
102setlocale(category, locale)
103	int category;
104	const char *locale;
105{
106	int i, j, len, saverr;
107	char *env, *r;
108
109	if (category < LC_ALL || category >= _LC_LAST) {
110		errno = EINVAL;
111		return (NULL);
112	}
113
114	if (locale == NULL)
115		return (category != LC_ALL ?
116		    current_categories[category] : currentlocale());
117
118	/*
119	 * Default to the current locale for everything.
120	 */
121	for (i = 1; i < _LC_LAST; ++i)
122		(void)strcpy(new_categories[i], current_categories[i]);
123
124	/*
125	 * Now go fill up new_categories from the locale argument
126	 */
127	if (!*locale) {
128		env = getenv("LC_ALL");
129
130		if (category != LC_ALL && (env == NULL || !*env))
131			env = getenv(categories[category]);
132
133		if (env == NULL || !*env)
134			env = getenv("LANG");
135
136		if (env == NULL || !*env)
137			env = "C";
138
139		if (strlen(env) > ENCODING_LEN) {
140			errno = EINVAL;
141			return (NULL);
142		}
143		(void)strcpy(new_categories[category], env);
144
145		if (category == LC_ALL) {
146			for (i = 1; i < _LC_LAST; ++i) {
147				if ((env = getenv(categories[i])) == NULL ||
148				    !*env)
149					env = new_categories[LC_ALL];
150				else if (strlen(env) > ENCODING_LEN) {
151					errno = EINVAL;
152					return (NULL);
153				}
154				(void)strcpy(new_categories[i], env);
155			}
156		}
157	} else if (category != LC_ALL) {
158		if (strlen(locale) > ENCODING_LEN) {
159			errno = EINVAL;
160			return (NULL);
161		}
162		(void)strcpy(new_categories[category], locale);
163	} else {
164		if ((r = strchr(locale, '/')) == NULL) {
165			if (strlen(locale) > ENCODING_LEN) {
166				errno = EINVAL;
167				return (NULL);
168			}
169			for (i = 1; i < _LC_LAST; ++i)
170				(void)strcpy(new_categories[i], locale);
171		} else {
172			for (i = 1; r[1] == '/'; ++r)
173				;
174			if (!r[1]) {
175				errno = EINVAL;
176				return (NULL);	/* Hmm, just slashes... */
177			}
178			do {
179				if (i == _LC_LAST)
180					break;  /* Too many slashes... */
181				if ((len = r - locale) > ENCODING_LEN) {
182					errno = EINVAL;
183					return (NULL);
184				}
185				(void)_strlcpy(new_categories[i], locale,
186					      len + 1);
187				i++;
188				locale = r;
189				while (*locale == '/')
190					++locale;
191				while (*++r && *r != '/')
192					;
193			} while (*locale);
194			while (i < _LC_LAST) {
195				(void)strcpy(new_categories[i],
196					     new_categories[i-1]);
197				i++;
198			}
199		}
200	}
201
202	if (category != LC_ALL)
203		return (loadlocale(category));
204
205	for (i = 1; i < _LC_LAST; ++i) {
206		(void)strcpy(saved_categories[i], current_categories[i]);
207		if (loadlocale(i) == NULL) {
208			saverr = errno;
209			for (j = 1; j < i; j++) {
210				(void)strcpy(new_categories[j],
211					     saved_categories[j]);
212				if (loadlocale(j) == NULL) {
213					(void)strcpy(new_categories[j], "C");
214					(void)loadlocale(j);
215				}
216			}
217			errno = saverr;
218			return (NULL);
219		}
220	}
221	return (currentlocale());
222}
223
224static char *
225currentlocale()
226{
227	int i;
228
229	(void)strcpy(current_locale_string, current_categories[1]);
230
231	for (i = 2; i < _LC_LAST; ++i)
232		if (strcmp(current_categories[1], current_categories[i])) {
233			for (i = 2; i < _LC_LAST; ++i) {
234				(void)strcat(current_locale_string, "/");
235				(void)strcat(current_locale_string,
236					     current_categories[i]);
237			}
238			break;
239		}
240	return (current_locale_string);
241}
242
243static int
244wrap_setrunelocale(const char *locale)
245{
246	int ret = setrunelocale((char *)locale);
247
248	if (ret != 0) {
249		errno = ret;
250		return (_LDP_ERROR);
251	}
252	return (_LDP_LOADED);
253}
254
255static char *
256loadlocale(category)
257	int category;
258{
259	char *new = new_categories[category];
260	char *old = current_categories[category];
261	int (*func)(const char *);
262
263	if ((new[0] == '.' &&
264	     (new[1] == '\0' || (new[1] == '.' && new[2] == '\0'))) ||
265	    strchr(new, '/') != NULL) {
266		errno = EINVAL;
267		return (NULL);
268	}
269
270	if (_PathLocale == NULL) {
271		char *p = getenv("PATH_LOCALE");
272
273		if (p != NULL
274#ifndef __NETBSD_SYSCALLS
275			&& !issetugid()
276#endif
277			) {
278			if (strlen(p) + 1/*"/"*/ + ENCODING_LEN +
279			    1/*"/"*/ + CATEGORY_LEN >= PATH_MAX) {
280				errno = ENAMETOOLONG;
281				return (NULL);
282			}
283			_PathLocale = strdup(p);
284			if (_PathLocale == NULL) {
285				errno = ENOMEM;
286				return (NULL);
287			}
288		} else
289			_PathLocale = _PATH_LOCALE;
290	}
291
292	switch (category) {
293	case LC_CTYPE:
294		func = wrap_setrunelocale;
295		break;
296	case LC_COLLATE:
297		func = __collate_load_tables;
298		break;
299	case LC_TIME:
300		func = __time_load_locale;
301		break;
302	case LC_NUMERIC:
303		func = __numeric_load_locale;
304		break;
305	case LC_MONETARY:
306		func = __monetary_load_locale;
307		break;
308	case LC_MESSAGES:
309		func = __messages_load_locale;
310		break;
311	default:
312		errno = EINVAL;
313		return (NULL);
314	}
315
316	if (strcmp(new, old) == 0)
317		return (old);
318
319	if (func(new) != _LDP_ERROR) {
320		(void)strcpy(old, new);
321		return (old);
322	}
323
324	return (NULL);
325}
326
327