setlocale.c revision 22330 
1/*
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Paul Borman at Krystal Technologies.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * $FreeBSD: head/lib/libc/locale/setlocale.c 22330 1997-02-06 09:11:06Z ache $
37 */
38
39#ifdef LIBC_RCS
40static const char rcsid[] =
41	"$FreeBSD: head/lib/libc/locale/setlocale.c 22330 1997-02-06 09:11:06Z ache $";
42#endif
43
44#if defined(LIBC_SCCS) && !defined(lint)
45static char sccsid[] = "@(#)setlocale.c	8.1 (Berkeley) 7/4/93";
46#endif /* LIBC_SCCS and not lint */
47
48#include <sys/types.h>
49#include <sys/stat.h>
50#include <limits.h>
51#include <locale.h>
52#include <rune.h>
53#include <stdlib.h>
54#include <string.h>
55#include <unistd.h>
56#include "collate.h"
57#include "setlocale.h"
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};
70
71/*
72 * Current locales for each category
73 */
74static char current_categories[_LC_LAST][ENCODING_LEN + 1] = {
75    "C",
76    "C",
77    "C",
78    "C",
79    "C",
80    "C",
81};
82
83/*
84 * The locales we are going to try and load
85 */
86static char new_categories[_LC_LAST][ENCODING_LEN + 1];
87static char saved_categories[_LC_LAST][ENCODING_LEN + 1];
88
89static char current_locale_string[_LC_LAST * (ENCODING_LEN + 1/*"/"*/ + 1)];
90
91static char	*currentlocale __P((void));
92static char	*loadlocale __P((int));
93static int      stub_load_locale __P((const char *));
94
95extern int __time_load_locale __P((const char *)); /* strftime.c */
96
97#ifdef XPG4
98extern int _xpg4_setrunelocale __P((char *));
99#endif
100
101char *
102setlocale(category, locale)
103	int category;
104	const char *locale;
105{
106	int i, j, len;
107	char *env, *r;
108
109	if (category < LC_ALL || category >= _LC_LAST)
110		return (NULL);
111
112	if (!locale)
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(categories[category]);
127
128		if (category != LC_ALL && (!env || !*env))
129			env = getenv(categories[LC_ALL]);
130
131		if (!env || !*env)
132			env = getenv("LANG");
133
134		if (!env || !*env)
135			env = "C";
136
137		(void) strncpy(new_categories[category], env, ENCODING_LEN);
138		new_categories[category][ENCODING_LEN] = '\0';
139		if (category == LC_ALL) {
140			for (i = 1; i < _LC_LAST; ++i) {
141				if (!(env = getenv(categories[i])) || !*env)
142					env = new_categories[LC_ALL];
143				(void)strncpy(new_categories[i], env, ENCODING_LEN);
144				new_categories[i][ENCODING_LEN] = '\0';
145			}
146		}
147	} else if (category != LC_ALL)  {
148		(void)strncpy(new_categories[category], locale, ENCODING_LEN);
149		new_categories[category][ENCODING_LEN] = '\0';
150	} else {
151		if ((r = strchr(locale, '/')) == NULL) {
152			for (i = 1; i < _LC_LAST; ++i) {
153				(void)strncpy(new_categories[i], locale, ENCODING_LEN);
154				new_categories[i][ENCODING_LEN] = '\0';
155			}
156		} else {
157			for (i = 1; r[1] == '/'; ++r);
158			if (!r[1])
159				return (NULL);	/* Hmm, just slashes... */
160			do {
161				len = r - locale > ENCODING_LEN ? ENCODING_LEN : r - locale;
162				(void)strncpy(new_categories[i], locale, len);
163				new_categories[i][len] = '\0';
164				i++;
165				locale = r;
166				while (*locale == '/')
167				    ++locale;
168				while (*++r && *r != '/');
169			} while (*locale);
170			while (i < _LC_LAST)
171				(void)strcpy(new_categories[i],
172				    new_categories[i-1]);
173		}
174	}
175
176	if (category)
177		return (loadlocale(category));
178
179	for (i = 1; i < _LC_LAST; ++i) {
180		(void)strcpy(saved_categories[i], current_categories[i]);
181		if (loadlocale(i) == NULL) {
182			for (j = 1; j < i; j++) {
183				(void)strcpy(new_categories[j],
184				     saved_categories[j]);
185				/* XXX can fail too */
186				(void)loadlocale(j);
187			}
188			return (NULL);
189		}
190	}
191	return (currentlocale());
192}
193
194static char *
195currentlocale()
196{
197	int i;
198
199	(void)strcpy(current_locale_string, current_categories[1]);
200
201	for (i = 2; i < _LC_LAST; ++i)
202		if (strcmp(current_categories[1], current_categories[i])) {
203			(void) strcpy(current_locale_string, current_categories[1]);
204			(void) strcat(current_locale_string, "/");
205			(void) strcat(current_locale_string, current_categories[2]);
206			(void) strcat(current_locale_string, "/");
207			(void) strcat(current_locale_string, current_categories[3]);
208			(void) strcat(current_locale_string, "/");
209			(void) strcat(current_locale_string, current_categories[4]);
210			(void) strcat(current_locale_string, "/");
211			(void) strcat(current_locale_string, current_categories[5]);
212			break;
213		}
214	return (current_locale_string);
215}
216
217static char *
218loadlocale(category)
219	int category;
220{
221	char *ret;
222	char *new = new_categories[category];
223	char *old = current_categories[category];
224
225	if (!_PathLocale)
226		_PathLocale = _PATH_LOCALE;
227
228	if (strcmp(new, old) == 0)
229		return (old);
230
231	if (category == LC_CTYPE) {
232#ifdef XPG4
233		ret = _xpg4_setrunelocale(new) ? NULL : new;
234#else
235		ret = setrunelocale(new) ? NULL : new;
236#endif
237		if (!ret) {
238#ifdef XPG4
239			(void)_xpg4_setrunelocale(old);
240#else
241			(void)setrunelocale(old);
242#endif
243		} else
244			(void)strcpy(old, new);
245		return (ret);
246	}
247
248	if (category == LC_COLLATE) {
249		ret = (__collate_load_tables(new) < 0) ? NULL : new;
250		if (!ret)
251			(void)__collate_load_tables(old);
252		else
253			(void)strcpy(old, new);
254		return (ret);
255	}
256
257	if (category == LC_TIME) {
258		ret = (__time_load_locale(new) < 0) ? NULL : new;
259		if (!ret)
260			(void)__time_load_locale(old);
261		else
262			(void)strcpy(old, new);
263		return (ret);
264	}
265
266	if (category == LC_MONETARY || category == LC_NUMERIC) {
267		ret = stub_load_locale(new) ? NULL : new;
268		if (!ret)
269			(void)stub_load_locale(old);
270		else
271			(void)strcpy(old, new);
272		return (ret);
273	}
274
275	/* Just in case...*/
276	return (NULL);
277}
278
279static int
280stub_load_locale(encoding)
281const char *encoding;
282{
283	char name[PATH_MAX];
284	struct stat st;
285
286	if (!encoding)
287		return(1);
288	/*
289	 * The "C" and "POSIX" locale are always here.
290	 */
291	if (!strcmp(encoding, "C") || !strcmp(encoding, "POSIX"))
292		return(0);
293	if (!_PathLocale)
294		return(1);
295	/* Range checking not needed, encoding has fixed size */
296	strcpy(name, _PathLocale);
297	strcat(name, "/");
298	strcat(name, encoding);
299#if 0
300	/*
301	 * Some day we will actually look at this file.
302	 */
303#endif
304	return (stat(name, &st) != 0 || !S_ISDIR(st.st_mode));
305}
306