setlocale.c revision 302408 
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 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#if defined(LIBC_SCCS) && !defined(lint)
35static char sccsid[] = "@(#)setlocale.c	8.1 (Berkeley) 7/4/93";
36#endif /* LIBC_SCCS and not lint */
37#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: stable/11/lib/libc/locale/setlocale.c 288037 2015-09-20 20:50:18Z rodrigc $");
39
40#include <sys/types.h>
41#include <sys/stat.h>
42#include <errno.h>
43#include <limits.h>
44#include <locale.h>
45#include <paths.h>	/* for _PATH_LOCALE */
46#include <stdlib.h>
47#include <string.h>
48#include <unistd.h>
49#include "collate.h"
50#include "lmonetary.h"	/* for __monetary_load_locale() */
51#include "lnumeric.h"	/* for __numeric_load_locale() */
52#include "lmessages.h"	/* for __messages_load_locale() */
53#include "setlocale.h"
54#include "ldpart.h"
55#include "../stdtime/timelocal.h" /* for __time_load_locale() */
56
57/*
58 * Category names for getenv()
59 */
60static const char categories[_LC_LAST][12] = {
61    "LC_ALL",
62    "LC_COLLATE",
63    "LC_CTYPE",
64    "LC_MONETARY",
65    "LC_NUMERIC",
66    "LC_TIME",
67    "LC_MESSAGES",
68};
69
70/*
71 * Current locales for each category
72 */
73static char current_categories[_LC_LAST][ENCODING_LEN + 1] = {
74    "C",
75    "C",
76    "C",
77    "C",
78    "C",
79    "C",
80    "C",
81};
82
83/*
84 * Path to locale storage directory
85 */
86char	*_PathLocale;
87
88/*
89 * The locales we are going to try and load
90 */
91static char new_categories[_LC_LAST][ENCODING_LEN + 1];
92static char saved_categories[_LC_LAST][ENCODING_LEN + 1];
93
94static char current_locale_string[_LC_LAST * (ENCODING_LEN + 1/*"/"*/ + 1)];
95
96static char	*currentlocale(void);
97static char	*loadlocale(int);
98const char *__get_locale_env(int);
99
100char *
101setlocale(int category, const char *locale)
102{
103	int i, j, len, saverr;
104        const char *env, *r;
105
106	if (category < LC_ALL || category >= _LC_LAST) {
107		errno = EINVAL;
108		return (NULL);
109	}
110
111	if (locale == NULL)
112		return (category != LC_ALL ?
113		    current_categories[category] : currentlocale());
114
115	/*
116	 * Default to the current locale for everything.
117	 */
118	for (i = 1; i < _LC_LAST; ++i)
119		(void)strcpy(new_categories[i], current_categories[i]);
120
121	/*
122	 * Now go fill up new_categories from the locale argument
123	 */
124	if (!*locale) {
125		if (category == LC_ALL) {
126			for (i = 1; i < _LC_LAST; ++i) {
127				env = __get_locale_env(i);
128				if (strlen(env) > ENCODING_LEN) {
129					errno = EINVAL;
130					return (NULL);
131				}
132				(void)strcpy(new_categories[i], env);
133			}
134		} else {
135			env = __get_locale_env(category);
136			if (strlen(env) > ENCODING_LEN) {
137				errno = EINVAL;
138				return (NULL);
139			}
140			(void)strcpy(new_categories[category], env);
141		}
142	} else if (category != LC_ALL) {
143		if (strlen(locale) > ENCODING_LEN) {
144			errno = EINVAL;
145			return (NULL);
146		}
147		(void)strcpy(new_categories[category], locale);
148	} else {
149		if ((r = strchr(locale, '/')) == NULL) {
150			if (strlen(locale) > ENCODING_LEN) {
151				errno = EINVAL;
152				return (NULL);
153			}
154			for (i = 1; i < _LC_LAST; ++i)
155				(void)strcpy(new_categories[i], locale);
156		} else {
157			for (i = 1; r[1] == '/'; ++r)
158				;
159			if (!r[1]) {
160				errno = EINVAL;
161				return (NULL);	/* Hmm, just slashes... */
162			}
163			do {
164				if (i == _LC_LAST)
165					break;  /* Too many slashes... */
166				if ((len = r - locale) > ENCODING_LEN) {
167					errno = EINVAL;
168					return (NULL);
169				}
170				(void)strlcpy(new_categories[i], locale,
171					      len + 1);
172				i++;
173				while (*r == '/')
174					r++;
175				locale = r;
176				while (*r && *r != '/')
177					r++;
178			} while (*locale);
179			while (i < _LC_LAST) {
180				(void)strcpy(new_categories[i],
181					     new_categories[i-1]);
182				i++;
183			}
184		}
185	}
186
187	if (category != LC_ALL)
188		return (loadlocale(category));
189
190	for (i = 1; i < _LC_LAST; ++i) {
191		(void)strcpy(saved_categories[i], current_categories[i]);
192		if (loadlocale(i) == NULL) {
193			saverr = errno;
194			for (j = 1; j < i; j++) {
195				(void)strcpy(new_categories[j],
196					     saved_categories[j]);
197				if (loadlocale(j) == NULL) {
198					(void)strcpy(new_categories[j], "C");
199					(void)loadlocale(j);
200				}
201			}
202			errno = saverr;
203			return (NULL);
204		}
205	}
206	return (currentlocale());
207}
208
209static char *
210currentlocale(void)
211{
212	int i;
213
214	(void)strcpy(current_locale_string, current_categories[1]);
215
216	for (i = 2; i < _LC_LAST; ++i)
217		if (strcmp(current_categories[1], current_categories[i])) {
218			for (i = 2; i < _LC_LAST; ++i) {
219				(void)strcat(current_locale_string, "/");
220				(void)strcat(current_locale_string,
221					     current_categories[i]);
222			}
223			break;
224		}
225	return (current_locale_string);
226}
227
228static char *
229loadlocale(int category)
230{
231	char *new = new_categories[category];
232	char *old = current_categories[category];
233	int (*func)(const char *);
234	int saved_errno;
235
236	if ((new[0] == '.' &&
237	     (new[1] == '\0' || (new[1] == '.' && new[2] == '\0'))) ||
238	    strchr(new, '/') != NULL) {
239		errno = EINVAL;
240		return (NULL);
241	}
242
243	saved_errno = errno;
244	errno = __detect_path_locale();
245	if (errno != 0)
246		return (NULL);
247	errno = saved_errno;
248
249	switch (category) {
250	case LC_CTYPE:
251		func = __wrap_setrunelocale;
252		break;
253	case LC_COLLATE:
254		func = __collate_load_tables;
255		break;
256	case LC_TIME:
257		func = __time_load_locale;
258		break;
259	case LC_NUMERIC:
260		func = __numeric_load_locale;
261		break;
262	case LC_MONETARY:
263		func = __monetary_load_locale;
264		break;
265	case LC_MESSAGES:
266		func = __messages_load_locale;
267		break;
268	default:
269		errno = EINVAL;
270		return (NULL);
271	}
272
273	if (strcmp(new, old) == 0)
274		return (old);
275
276	if (func(new) != _LDP_ERROR) {
277		(void)strcpy(old, new);
278		(void)strcpy(__xlocale_global_locale.components[category-1]->locale, new);
279		return (old);
280	}
281
282	return (NULL);
283}
284
285const char *
286__get_locale_env(int category)
287{
288        const char *env;
289
290        /* 1. check LC_ALL. */
291        env = getenv(categories[0]);
292
293        /* 2. check LC_* */
294	if (env == NULL || !*env)
295                env = getenv(categories[category]);
296
297        /* 3. check LANG */
298	if (env == NULL || !*env)
299                env = getenv("LANG");
300
301        /* 4. if none is set, fall to "C" */
302	if (env == NULL || !*env)
303                env = "C";
304
305	return (env);
306}
307
308/*
309 * Detect locale storage location and store its value to _PathLocale variable
310 */
311int
312__detect_path_locale(void)
313{
314	if (_PathLocale == NULL) {
315		char *p = getenv("PATH_LOCALE");
316
317		if (p != NULL && !issetugid()) {
318			if (strlen(p) + 1/*"/"*/ + ENCODING_LEN +
319			    1/*"/"*/ + CATEGORY_LEN >= PATH_MAX)
320				return (ENAMETOOLONG);
321			_PathLocale = strdup(p);
322			if (_PathLocale == NULL)
323				return (errno == 0 ? ENOMEM : errno);
324		} else
325			_PathLocale = _PATH_LOCALE;
326	}
327	return (0);
328}
329
330