setrunelocale.c revision 24694 
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 _RuneLocale      *_Read_RuneMagi __P((FILE *));
53
54#ifdef XPG4
55int
56setrunelocale(encoding)
57	char *encoding;
58{
59	return _xpg4_setrunelocale(encoding);
60}
61#endif
62
63int
64#ifndef XPG4
65setrunelocale(encoding)
66#else
67_xpg4_setrunelocale(encoding)
68#endif
69	char *encoding;
70{
71	FILE *fp;
72	char name[PATH_MAX];
73	_RuneLocale *rl;
74
75	if (!encoding || strlen(encoding) > ENCODING_LEN)
76	    return(EFAULT);
77
78	/*
79	 * The "C" and "POSIX" locale are always here.
80	 */
81	if (!strcmp(encoding, "C") || !strcmp(encoding, "POSIX")) {
82		_CurrentRuneLocale = &_DefaultRuneLocale;
83		return(0);
84	}
85
86	if (_PathLocale == NULL) {
87		char *p = getenv("PATH_LOCALE");
88
89		if (p != NULL && !issetugid()) {
90			if (strlen(p) + 1/*"/"*/ + ENCODING_LEN +
91			    1/*"/"*/ + CATEGORY_LEN >= PATH_MAX)
92				return(EFAULT);
93			_PathLocale = strdup(p);
94			if (_PathLocale == NULL)
95				return (errno);
96		} else
97			_PathLocale = _PATH_LOCALE;
98	}
99	/* Range checking not needed, encoding length already checked above */
100	(void) strcpy(name, _PathLocale);
101	(void) strcat(name, "/");
102	(void) strcat(name, encoding);
103	(void) strcat(name, "/LC_CTYPE");
104
105	if ((fp = fopen(name, "r")) == NULL)
106		return(ENOENT);
107
108	if ((rl = _Read_RuneMagi(fp)) == 0) {
109		fclose(fp);
110		return(EFTYPE);
111	}
112	fclose(fp);
113
114#ifdef XPG4
115	if (!rl->encoding[0] || !strcmp(rl->encoding, "UTF2")) {
116		return(_UTF2_init(rl));
117#else
118	if (!rl->encoding[0]) {
119		return(EINVAL);
120#endif
121	} else if (!strcmp(rl->encoding, "NONE")) {
122		return(_none_init(rl));
123#ifdef XPG4
124	} else if (!strcmp(rl->encoding, "EUC")) {
125		return(_EUC_init(rl));
126#endif
127	} else
128		return(EINVAL);
129}
130
131