setlocale.c revision 92986 
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 92986 2002-03-22 21:53:29Z obrien $");
43
44#include <sys/types.h>
45#include <sys/stat.h>
46#include <limits.h>
47#include <locale.h>
48#include <rune.h>
49#include <stdlib.h>
50#include <string.h>
51#include <unistd.h>
52#include "collate.h"
53#include "lmonetary.h"	/* for __monetary_load_locale() */
54#include "lnumeric.h"	/* for __numeric_load_locale() */
55#include "lmessages.h"	/* for __messages_load_locale() */
56#include "setlocale.h"
57#include "../stdtime/timelocal.h" /* for __time_load_locale() */
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(void);
94static char	*loadlocale(int);
95
96char *
97setlocale(category, locale)
98	int category;
99	const char *locale;
100{
101	int i, j, len;
102	char *env, *r;
103
104	if (category < LC_ALL || category >= _LC_LAST)
105		return (NULL);
106
107	if (!locale)
108		return (category != LC_ALL ?
109		    current_categories[category] : currentlocale());
110
111	/*
112	 * Default to the current locale for everything.
113	 */
114	for (i = 1; i < _LC_LAST; ++i)
115		(void)strcpy(new_categories[i], current_categories[i]);
116
117	/*
118	 * Now go fill up new_categories from the locale argument
119	 */
120	if (!*locale) {
121		env = getenv("LC_ALL");
122
123		if (category != LC_ALL && (!env || !*env))
124			env = getenv(categories[category]);
125
126		if (!env || !*env)
127			env = getenv("LANG");
128
129		if (!env || !*env || strchr(env, '/'))
130			env = "C";
131
132		(void) strncpy(new_categories[category], env, ENCODING_LEN);
133		new_categories[category][ENCODING_LEN] = '\0';
134		if (category == LC_ALL) {
135			for (i = 1; i < _LC_LAST; ++i) {
136				if (!(env = getenv(categories[i])) || !*env)
137					env = new_categories[LC_ALL];
138				(void)strncpy(new_categories[i], env, ENCODING_LEN);
139				new_categories[i][ENCODING_LEN] = '\0';
140			}
141		}
142	} else if (category != LC_ALL)  {
143		(void)strncpy(new_categories[category], locale, ENCODING_LEN);
144		new_categories[category][ENCODING_LEN] = '\0';
145	} else {
146		if ((r = strchr(locale, '/')) == NULL) {
147			for (i = 1; i < _LC_LAST; ++i) {
148				(void)strncpy(new_categories[i], locale, ENCODING_LEN);
149				new_categories[i][ENCODING_LEN] = '\0';
150			}
151		} else {
152			for (i = 1; r[1] == '/'; ++r);
153			if (!r[1])
154				return (NULL);	/* Hmm, just slashes... */
155			do {
156				len = r - locale > ENCODING_LEN ? ENCODING_LEN : r - locale;
157				(void)strncpy(new_categories[i], locale, len);
158				new_categories[i][len] = '\0';
159				i++;
160				locale = r;
161				while (*locale == '/')
162				    ++locale;
163				while (*++r && *r != '/');
164			} while (*locale);
165			while (i < _LC_LAST) {
166				(void)strcpy(new_categories[i],
167				    new_categories[i-1]);
168				i++;
169			}
170		}
171	}
172
173	if (category != LC_ALL)
174		return (loadlocale(category));
175
176	for (i = 1; i < _LC_LAST; ++i) {
177		(void)strcpy(saved_categories[i], current_categories[i]);
178		if (loadlocale(i) == NULL) {
179			for (j = 1; j < i; j++) {
180				(void)strcpy(new_categories[j],
181				     saved_categories[j]);
182				/* XXX can fail too */
183				(void)loadlocale(j);
184			}
185			return (NULL);
186		}
187	}
188	return (currentlocale());
189}
190
191static char *
192currentlocale()
193{
194	int i;
195
196	(void)strcpy(current_locale_string, current_categories[1]);
197
198	for (i = 2; i < _LC_LAST; ++i)
199		if (strcmp(current_categories[1], current_categories[i])) {
200			for (i = 2; i < _LC_LAST; ++i) {
201				(void) strcat(current_locale_string, "/");
202				(void) strcat(current_locale_string, current_categories[i]);
203			}
204			break;
205		}
206	return (current_locale_string);
207}
208
209static char *
210loadlocale(category)
211	int category;
212{
213	char *ret;
214	char *new = new_categories[category];
215	char *old = current_categories[category];
216
217	if (_PathLocale == NULL) {
218		char *p = getenv("PATH_LOCALE");
219
220		if (p != NULL
221#ifndef __NETBSD_SYSCALLS
222			&& !issetugid()
223#endif
224			) {
225			if (strlen(p) + 1/*"/"*/ + ENCODING_LEN +
226			    1/*"/"*/ + CATEGORY_LEN >= PATH_MAX)
227				return (NULL);
228			_PathLocale = strdup(p);
229			if (_PathLocale == NULL)
230				return (NULL);
231		} else
232			_PathLocale = _PATH_LOCALE;
233	}
234
235	if (strcmp(new, old) == 0)
236		return (old);
237
238	if (category == LC_CTYPE) {
239		ret = setrunelocale(new) ? NULL : new;
240		if (!ret)
241			(void)setrunelocale(old);
242		else
243			(void)strcpy(old, new);
244		return (ret);
245	}
246
247#define LOAD_CATEGORY(CAT, FUNC)			\
248	if (category == CAT) {				\
249		ret = (FUNC(new) < 0) ? NULL : new;	\
250		if (!ret)				\
251			(void)FUNC(old);		\
252		else					\
253			(void)strcpy(old, new);		\
254		return (ret);				\
255	}
256
257	LOAD_CATEGORY(LC_COLLATE, __collate_load_tables);
258	LOAD_CATEGORY(LC_TIME, __time_load_locale);
259	LOAD_CATEGORY(LC_NUMERIC, __numeric_load_locale);
260	LOAD_CATEGORY(LC_MONETARY, __monetary_load_locale);
261	LOAD_CATEGORY(LC_MESSAGES, __messages_load_locale);
262
263	/* Just in case...*/
264	return (NULL);
265}
266
267