setlocale.c revision 11660 
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
37#if defined(LIBC_SCCS) && !defined(lint)
38static char sccsid[] = "@(#)setlocale.c	8.1 (Berkeley) 7/4/93";
39#endif /* LIBC_SCCS and not lint */
40
41#include <limits.h>
42#include <locale.h>
43#include <rune.h>
44#include <stdlib.h>
45#include <string.h>
46#include "common_setlocale.h"
47#include "common_rune.h"
48
49char *_PathLocale;
50
51static char	*loadlocale __P((int));
52
53char *
54setlocale(category, locale)
55	int category;
56	const char *locale;
57{
58	int found, i, len;
59	char *env, *r;
60
61	if (!PathLocale && !(PathLocale = getenv("PATH_LOCALE")))
62		PathLocale = _PATH_LOCALE;
63
64	if (category < 0 || category >= _LC_LAST)
65		return (NULL);
66
67	if (!locale)
68		return (category ?
69		    current_categories[category] : currentlocale());
70
71	/*
72	 * Default to the current locale for everything.
73	 */
74	for (i = 1; i < _LC_LAST; ++i)
75		(void)strcpy(new_categories[i], current_categories[i]);
76
77	/*
78	 * Now go fill up new_categories from the locale argument
79	 */
80	if (!*locale) {
81		env = getenv(categories[category]);
82
83		if (!env)
84			env = getenv(categories[0]);
85
86		if (!env)
87			env = getenv("LANG");
88
89		if (!env)
90			env = "C";
91
92		(void) strncpy(new_categories[category], env, 31);
93		new_categories[category][31] = 0;
94		if (!category) {
95			for (i = 1; i < _LC_LAST; ++i) {
96				if (!(env = getenv(categories[i])))
97					env = new_categories[0];
98				(void)strncpy(new_categories[i], env, 31);
99				new_categories[i][31] = 0;
100			}
101		}
102	} else if (category)  {
103		(void)strncpy(new_categories[category], locale, 31);
104		new_categories[category][31] = 0;
105	} else {
106		if ((r = strchr(locale, '/')) == 0) {
107			for (i = 1; i < _LC_LAST; ++i) {
108				(void)strncpy(new_categories[i], locale, 31);
109				new_categories[i][31] = 0;
110			}
111		} else {
112			for (i = 1; r[1] == '/'; ++r);
113			if (!r[1])
114				return (NULL);	/* Hmm, just slashes... */
115			do {
116				len = r - locale > 31 ? 31 : r - locale;
117				(void)strncpy(new_categories[i++], locale, len);
118				new_categories[i++][len] = 0;
119				locale = r;
120				while (*locale == '/')
121				    ++locale;
122				while (*++r && *r != '/');
123			} while (*locale);
124			while (i < _LC_LAST)
125				(void)strcpy(new_categories[i],
126				    new_categories[i-1]);
127		}
128	}
129
130	if (category)
131		return (loadlocale(category));
132
133	found = 0;
134	for (i = 1; i < _LC_LAST; ++i)
135		if (loadlocale(i) != NULL)
136			found = 1;
137	if (found)
138	    return (currentlocale());
139	return (NULL);
140}
141
142static char *
143loadlocale(category)
144	int category;
145{
146#if 0
147	char name[PATH_MAX];
148#endif
149	if (strcmp(new_categories[category],
150	    current_categories[category]) == 0)
151		return (current_categories[category]);
152
153	if (category == LC_CTYPE) {
154		if (setrunelocale(new_categories[LC_CTYPE]))
155			return (NULL);
156		(void)strcpy(current_categories[LC_CTYPE],
157		    new_categories[LC_CTYPE]);
158		return (current_categories[LC_CTYPE]);
159	}
160
161	if (category == LC_COLLATE) {
162		if (__collate_load_tables(new_categories[LC_COLLATE]) < 0)
163			return (NULL);
164		(void)strcpy(current_categories[LC_COLLATE],
165		    new_categories[LC_COLLATE]);
166		return (current_categories[LC_COLLATE]);
167	}
168
169	if (category == LC_TIME) {
170		if (__time_load_locale(new_categories[LC_TIME]) < 0)
171			return (NULL);
172		(void)strcpy(current_categories[LC_TIME],
173		       new_categories[LC_TIME]);
174		return (current_categories[LC_TIME]);
175	}
176
177	if (!strcmp(new_categories[category], "C") ||
178		!strcmp(new_categories[category], "POSIX")) {
179
180		/*
181		 * Some day this will need to reset the locale to the default
182		 * C locale.  Since we have no way to change them as of yet,
183		 * there is no need to reset them.
184		 */
185		(void)strcpy(current_categories[category],
186		    new_categories[category]);
187		return (current_categories[category]);
188	}
189#if 0
190	/*
191	 * Some day we will actually look at this file.
192	 */
193	(void)snprintf(name, sizeof(name), "%s/%s/%s",
194	    PathLocale, new_categories[category], categories[category]);
195#endif
196	switch (category) {
197		case LC_MONETARY:
198		case LC_NUMERIC:
199			return (NULL);
200	}
201	/* Just in case...*/
202	return (NULL);
203}
204