setrunelocale.c revision 101566 
1/*-
2 * Copyright (c) 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#include <sys/cdefs.h>
38__FBSDID("$FreeBSD: head/lib/libc/locale/setrunelocale.c 101566 2002-08-09 08:22:29Z ache $");
39
40#include <rune.h>
41#include <errno.h>
42#include <limits.h>
43#include <string.h>
44#include <stdio.h>
45#include <stdlib.h>
46#include <unistd.h>
47#include "setlocale.h"
48
49extern int		_none_init(_RuneLocale *);
50extern int		_UTF2_init(_RuneLocale *);
51extern int		_EUC_init(_RuneLocale *);
52extern int		_BIG5_init(_RuneLocale *);
53extern int		_MSKanji_init(_RuneLocale *);
54extern _RuneLocale      *_Read_RuneMagi(FILE *);
55
56int
57setrunelocale(char *encoding)
58{
59	FILE *fp;
60	char name[PATH_MAX];
61	_RuneLocale *rl;
62	int saverr, ret;
63	static char ctype_encoding[ENCODING_LEN + 1];
64	static _RuneLocale *CachedRuneLocale;
65	static int Cached__mb_cur_max;
66
67	if (!encoding || !*encoding || strlen(encoding) > ENCODING_LEN ||
68	    (encoding[0] == '.' &&
69	     (encoding[1] == '\0' ||
70	      (encoding[1] == '.' && encoding[2] == '\0'))) ||
71	    strchr(encoding, '/') != NULL)
72		return (EINVAL);
73
74	/*
75	 * The "C" and "POSIX" locale are always here.
76	 */
77	if (strcmp(encoding, "C") == 0 || strcmp(encoding, "POSIX") == 0) {
78		_CurrentRuneLocale = &_DefaultRuneLocale;
79		__mb_cur_max = 1;
80		return (0);
81	}
82
83	/*
84	 * If the locale name is the same as our cache, use the cache.
85	 */
86	if (CachedRuneLocale != NULL &&
87	    strcmp(encoding, ctype_encoding) == 0) {
88		_CurrentRuneLocale = CachedRuneLocale;
89		__mb_cur_max = Cached__mb_cur_max;
90		return (0);
91	}
92
93	/*
94	 * Slurp the locale file into the cache.
95	 */
96	if (_PathLocale == NULL) {
97		char *p = getenv("PATH_LOCALE");
98
99		if (p != NULL
100#ifndef __NETBSD_SYSCALLS
101			&& !issetugid()
102#endif
103			) {
104			if (strlen(p) + 1/*"/"*/ + ENCODING_LEN +
105			    1/*"/"*/ + CATEGORY_LEN >= PATH_MAX)
106				return (ENAMETOOLONG);
107			_PathLocale = strdup(p);
108			if (_PathLocale == NULL)
109				return (errno == 0 ? ENOMEM : errno);
110		} else
111			_PathLocale = _PATH_LOCALE;
112	}
113	/* Range checking not needed, encoding length already checked above */
114	(void) strcpy(name, _PathLocale);
115	(void) strcat(name, "/");
116	(void) strcat(name, encoding);
117	(void) strcat(name, "/LC_CTYPE");
118
119	if ((fp = fopen(name, "r")) == NULL)
120		return (errno == 0 ? ENOENT : errno);
121
122	if ((rl = _Read_RuneMagi(fp)) == NULL) {
123		saverr = (errno == 0 ? EFTYPE : errno);
124		(void)fclose(fp);
125		return (saverr);
126	}
127	(void)fclose(fp);
128
129	if (strcmp(rl->encoding, "NONE") == 0)
130		ret = _none_init(rl);
131	else if (strcmp(rl->encoding, "UTF2") == 0)
132		ret = _UTF2_init(rl);
133	else if (strcmp(rl->encoding, "EUC") == 0)
134		ret = _EUC_init(rl);
135	else if (strcmp(rl->encoding, "BIG5") == 0)
136		ret = _BIG5_init(rl);
137	else if (strcmp(rl->encoding, "MSKanji") == 0)
138		ret = _MSKanji_init(rl);
139	else
140		ret = EFTYPE;
141	if (ret == 0) {
142		if (CachedRuneLocale != NULL) {
143			/* See euc.c */
144			if (strcmp(CachedRuneLocale->encoding, "EUC") == 0)
145				free(CachedRuneLocale->variable);
146			free(CachedRuneLocale);
147		}
148		CachedRuneLocale = _CurrentRuneLocale;
149		Cached__mb_cur_max = __mb_cur_max;
150		(void)strcpy(ctype_encoding, encoding);
151	} else
152		free(rl);
153
154	return (ret);
155}
156
157