fstab.c revision 11659 
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 void error __P((int));
50static int fstabscan __P((void));
51
52static int
53fstabscan()
54{
55	char *cp, *p;
56#define	MAXLINELENGTH	1024
57	static char line[MAXLINELENGTH];
58	char subline[MAXLINELENGTH];
59	int typexx;
60
61	for (;;) {
62
63		if (!(p = 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(p, " \t")) {
70			_fs_fstab.fs_spec = strsep(&p, ":\n");
71			_fs_fstab.fs_file = strsep(&p, ":\n");
72			_fs_fstab.fs_type = strsep(&p, ":\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 = strsep(&p, ":\n")) != NULL) {
81					_fs_fstab.fs_freq = atoi(cp);
82					if ((cp = strsep(&p, ":\n")) != NULL) {
83						_fs_fstab.fs_passno = atoi(cp);
84						return(1);
85					}
86				}
87			}
88			goto bad;
89		}
90/* OLD_STYLE_FSTAB */
91		while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
92			;
93		_fs_fstab.fs_spec = cp;
94		if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
95			continue;
96		while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
97			;
98		_fs_fstab.fs_file = cp;
99		while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
100			;
101		_fs_fstab.fs_vfstype = cp;
102		while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
103			;
104		_fs_fstab.fs_mntops = cp;
105		if (_fs_fstab.fs_mntops == NULL)
106			goto bad;
107		_fs_fstab.fs_freq = 0;
108		_fs_fstab.fs_passno = 0;
109		while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
110			;
111		if (cp != NULL) {
112			_fs_fstab.fs_freq = atoi(cp);
113			while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
114				;
115			if (cp != NULL)
116				_fs_fstab.fs_passno = atoi(cp);
117		}
118		strcpy(subline, _fs_fstab.fs_mntops);
119		p = subline;
120		for (typexx = 0, cp = strsep(&p, ","); cp;
121		     cp = strsep(&p, ",")) {
122			if (strlen(cp) != 2)
123				continue;
124			if (!strcmp(cp, FSTAB_RW)) {
125				_fs_fstab.fs_type = FSTAB_RW;
126				break;
127			}
128			if (!strcmp(cp, FSTAB_RQ)) {
129				_fs_fstab.fs_type = FSTAB_RQ;
130				break;
131			}
132			if (!strcmp(cp, FSTAB_RO)) {
133				_fs_fstab.fs_type = FSTAB_RO;
134				break;
135			}
136			if (!strcmp(cp, FSTAB_SW)) {
137				_fs_fstab.fs_type = FSTAB_SW;
138				break;
139			}
140			if (!strcmp(cp, FSTAB_XX)) {
141				_fs_fstab.fs_type = FSTAB_XX;
142				typexx++;
143				break;
144			}
145		}
146		if (typexx)
147			continue;
148		if (cp != NULL)
149			return(1);
150
151bad:		/* no way to distinguish between EOF and syntax error */
152		error(EFTYPE);
153	}
154	/* NOTREACHED */
155}
156
157struct fstab *
158getfsent()
159{
160	if ((!_fs_fp && !setfsent()) || !fstabscan())
161		return((struct fstab *)NULL);
162	return(&_fs_fstab);
163}
164
165struct fstab *
166getfsspec(name)
167	register const char *name;
168{
169	if (setfsent())
170		while (fstabscan())
171			if (!strcmp(_fs_fstab.fs_spec, name))
172				return(&_fs_fstab);
173	return((struct fstab *)NULL);
174}
175
176struct fstab *
177getfsfile(name)
178	register const char *name;
179{
180	if (setfsent())
181		while (fstabscan())
182			if (!strcmp(_fs_fstab.fs_file, name))
183				return(&_fs_fstab);
184	return((struct fstab *)NULL);
185}
186
187int
188setfsent()
189{
190	if (_fs_fp) {
191		rewind(_fs_fp);
192		LineNo = 0;
193		return(1);
194	}
195	if ((_fs_fp = fopen(_PATH_FSTAB, "r")) != NULL) {
196		LineNo = 0;
197		return(1);
198	}
199	error(errno);
200	return(0);
201}
202
203void
204endfsent()
205{
206	if (_fs_fp) {
207		(void)fclose(_fs_fp);
208		_fs_fp = NULL;
209	}
210}
211
212static void
213error(err)
214	int err;
215{
216	char *p;
217	char num[30];
218
219	(void)write(STDERR_FILENO, "fstab: ", 7);
220	(void)write(STDERR_FILENO, _PATH_FSTAB, sizeof(_PATH_FSTAB) - 1);
221	(void)write(STDERR_FILENO, ":", 1);
222	sprintf(num, "%d: ", LineNo);
223	(void)write(STDERR_FILENO, num, strlen(num));
224	p = strerror(err);
225	(void)write(STDERR_FILENO, p, strlen(p));
226	(void)write(STDERR_FILENO, "\n", 1);
227}
228