fstab.c revision 2569 
1/*
2 * Copyright (c) 1980, 1988, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
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[] = "@(#)fstab.c	8.1 (Berkeley) 6/4/93";
36#endif /* LIBC_SCCS and not lint */
37
38#include <errno.h>
39#include <fstab.h>
40#include <stdio.h>
41#include <stdlib.h>
42#include <string.h>
43#include <unistd.h>
44
45static FILE *_fs_fp;
46static struct fstab _fs_fstab;
47static int LineNo = 0;
48
49static error __P((int));
50static fstabscan __P((void));
51
52static
53fstabscan()
54{
55	register char *cp;
56#define	MAXLINELENGTH	1024
57	static char line[MAXLINELENGTH];
58	char subline[MAXLINELENGTH];
59	int typexx;
60
61	for (;;) {
62
63		if (!(cp = fgets(line, sizeof(line), _fs_fp)))
64			return(0);
65/* OLD_STYLE_FSTAB */
66		++LineNo;
67		if (*line == '#' || *line == '\n')
68			continue;
69		if (!strpbrk(cp, " \t")) {
70			_fs_fstab.fs_spec = strtok(cp, ":\n");
71			_fs_fstab.fs_file = strtok((char *)NULL, ":\n");
72			_fs_fstab.fs_type = strtok((char *)NULL, ":\n");
73			if (_fs_fstab.fs_type) {
74				if (!strcmp(_fs_fstab.fs_type, FSTAB_XX))
75					continue;
76				_fs_fstab.fs_mntops = _fs_fstab.fs_type;
77				_fs_fstab.fs_vfstype =
78				    strcmp(_fs_fstab.fs_type, FSTAB_SW) ?
79				    "ufs" : "swap";
80				if (cp = strtok((char *)NULL, ":\n")) {
81					_fs_fstab.fs_freq = atoi(cp);
82					if (cp = strtok((char *)NULL, ":\n")) {
83						_fs_fstab.fs_passno = atoi(cp);
84						return(1);
85					}
86				}
87			}
88			goto bad;
89		}
90/* OLD_STYLE_FSTAB */
91		_fs_fstab.fs_spec = strtok(cp, " \t\n");
92		if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
93			continue;
94		_fs_fstab.fs_file = strtok((char *)NULL, " \t\n");
95		_fs_fstab.fs_vfstype = strtok((char *)NULL, " \t\n");
96		_fs_fstab.fs_mntops = strtok((char *)NULL, " \t\n");
97		if (_fs_fstab.fs_mntops == NULL)
98			goto bad;
99		_fs_fstab.fs_freq = 0;
100		_fs_fstab.fs_passno = 0;
101		if ((cp = strtok((char *)NULL, " \t\n")) != NULL) {
102			_fs_fstab.fs_freq = atoi(cp);
103			if ((cp = strtok((char *)NULL, " \t\n")) != NULL)
104				_fs_fstab.fs_passno = atoi(cp);
105		}
106		strcpy(subline, _fs_fstab.fs_mntops);
107		for (typexx = 0, cp = strtok(subline, ","); cp;
108		     cp = strtok((char *)NULL, ",")) {
109			if (strlen(cp) != 2)
110				continue;
111			if (!strcmp(cp, FSTAB_RW)) {
112				_fs_fstab.fs_type = FSTAB_RW;
113				break;
114			}
115			if (!strcmp(cp, FSTAB_RQ)) {
116				_fs_fstab.fs_type = FSTAB_RQ;
117				break;
118			}
119			if (!strcmp(cp, FSTAB_RO)) {
120				_fs_fstab.fs_type = FSTAB_RO;
121				break;
122			}
123			if (!strcmp(cp, FSTAB_SW)) {
124				_fs_fstab.fs_type = FSTAB_SW;
125				break;
126			}
127			if (!strcmp(cp, FSTAB_XX)) {
128				_fs_fstab.fs_type = FSTAB_XX;
129				typexx++;
130				break;
131			}
132		}
133		if (typexx)
134			continue;
135		if (cp != NULL)
136			return(1);
137
138bad:		/* no way to distinguish between EOF and syntax error */
139		error(EFTYPE);
140	}
141	/* NOTREACHED */
142}
143
144struct fstab *
145getfsent()
146{
147	if (!_fs_fp && !setfsent() || !fstabscan())
148		return((struct fstab *)NULL);
149	return(&_fs_fstab);
150}
151
152struct fstab *
153getfsspec(name)
154	register const char *name;
155{
156	if (setfsent())
157		while (fstabscan())
158			if (!strcmp(_fs_fstab.fs_spec, name))
159				return(&_fs_fstab);
160	return((struct fstab *)NULL);
161}
162
163struct fstab *
164getfsfile(name)
165	register const char *name;
166{
167	if (setfsent())
168		while (fstabscan())
169			if (!strcmp(_fs_fstab.fs_file, name))
170				return(&_fs_fstab);
171	return((struct fstab *)NULL);
172}
173
174setfsent()
175{
176	if (_fs_fp) {
177		rewind(_fs_fp);
178		LineNo = 0;
179		return(1);
180	}
181	if (_fs_fp = fopen(_PATH_FSTAB, "r")) {
182		LineNo = 0;
183		return(1);
184	}
185	error(errno);
186	return(0);
187}
188
189void
190endfsent()
191{
192	if (_fs_fp) {
193		(void)fclose(_fs_fp);
194		_fs_fp = NULL;
195	}
196}
197
198static
199error(err)
200	int err;
201{
202	char *p;
203	char num[30];
204
205	(void)write(STDERR_FILENO, "fstab: ", 7);
206	(void)write(STDERR_FILENO, _PATH_FSTAB, sizeof(_PATH_FSTAB) - 1);
207	(void)write(STDERR_FILENO, ":", 1);
208	sprintf(num, "%d: ", LineNo);
209	(void)write(STDERR_FILENO, num, strlen(num));
210	p = strerror(err);
211	(void)write(STDERR_FILENO, p, strlen(p));
212	(void)write(STDERR_FILENO, "\n", 1);
213}
214