setrunelocale.c revision 29818 
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 <rune.h>
38#include <errno.h>
39#include <limits.h>
40#include <string.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <unistd.h>
44#include "setlocale.h"
45
46extern int		_none_init __P((_RuneLocale *));
47#ifdef XPG4
48extern int		_UTF2_init __P((_RuneLocale *));
49extern int		_EUC_init __P((_RuneLocale *));
50extern int              _xpg4_setrunelocale __P((char *));
51#endif
52extern int		_MSKanji_init __P((_RuneLocale *));
53extern _RuneLocale      *_Read_RuneMagi __P((FILE *));
54
55#ifdef XPG4
56int
57setrunelocale(encoding)
58	char *encoding;
59{
60	return _xpg4_setrunelocale(encoding);
61}
62#endif
63
64int
65#ifndef XPG4
66setrunelocale(encoding)
67#else
68_xpg4_setrunelocale(encoding)
69#endif
70	char *encoding;
71{
72	FILE *fp;
73	char name[PATH_MAX];
74	_RuneLocale *rl;
75
76	if (!encoding || strlen(encoding) > ENCODING_LEN)
77	    return(EFAULT);
78
79	/*
80	 * The "C" and "POSIX" locale are always here.
81	 */
82	if (!strcmp(encoding, "C") || !strcmp(encoding, "POSIX")) {
83		_CurrentRuneLocale = &_DefaultRuneLocale;
84		return(0);
85	}
86
87	if (_PathLocale == NULL) {
88		char *p = getenv("PATH_LOCALE");
89
90		if (p != NULL && !issetugid()) {
91			if (strlen(p) + 1/*"/"*/ + ENCODING_LEN +
92			    1/*"/"*/ + CATEGORY_LEN >= PATH_MAX)
93				return(EFAULT);
94			_PathLocale = strdup(p);
95			if (_PathLocale == NULL)
96				return (errno);
97		} else
98			_PathLocale = _PATH_LOCALE;
99	}
100	/* Range checking not needed, encoding length already checked above */
101	(void) strcpy(name, _PathLocale);
102	(void) strcat(name, "/");
103	(void) strcat(name, encoding);
104	(void) strcat(name, "/LC_CTYPE");
105
106	if ((fp = fopen(name, "r")) == NULL)
107		return(ENOENT);
108
109	if ((rl = _Read_RuneMagi(fp)) == 0) {
110		fclose(fp);
111		return(EFTYPE);
112	}
113	fclose(fp);
114
115#ifdef XPG4
116	if (!rl->encoding[0] || !strcmp(rl->encoding, "UTF2")) {
117		return(_UTF2_init(rl));
118#else
119	if (!rl->encoding[0]) {
120		return(EINVAL);
121#endif
122	} else if (!strcmp(rl->encoding, "NONE")) {
123		return(_none_init(rl));
124#ifdef XPG4
125	} else if (!strcmp(rl->encoding, "EUC")) {
126		return(_EUC_init(rl));
127#endif
128	} else if (!strcmp(rl->encoding, "MSKanji")) {
129		return(_MSKanji_init(rl));
130	} else
131		return(EINVAL);
132}
133
134