Initial revision
[kopensolaris-gnu/glibc.git] / misc / fstab.c
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)
35 static 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
45 static FILE *_fs_fp;
46 static struct fstab _fs_fstab;
47
48 static error __P((int));
49 static fstabscan __P((void));
50
51 static
52 fstabscan()
53 {
54         register char *cp;
55 #define MAXLINELENGTH   1024
56         static char line[MAXLINELENGTH];
57         char subline[MAXLINELENGTH];
58         int typexx;
59
60         for (;;) {
61                 if (!(cp = fgets(line, sizeof(line), _fs_fp)))
62                         return(0);
63 /* OLD_STYLE_FSTAB */
64                 if (!strpbrk(cp, " \t")) {
65                         _fs_fstab.fs_spec = strtok(cp, ":\n");
66                         _fs_fstab.fs_file = strtok((char *)NULL, ":\n");
67                         _fs_fstab.fs_type = strtok((char *)NULL, ":\n");
68                         if (_fs_fstab.fs_type) {
69                                 if (!strcmp(_fs_fstab.fs_type, FSTAB_XX))
70                                         continue;
71                                 _fs_fstab.fs_mntops = _fs_fstab.fs_type;
72                                 _fs_fstab.fs_vfstype =
73                                     strcmp(_fs_fstab.fs_type, FSTAB_SW) ?
74                                     "ufs" : "swap";
75                                 if (cp = strtok((char *)NULL, ":\n")) {
76                                         _fs_fstab.fs_freq = atoi(cp);
77                                         if (cp = strtok((char *)NULL, ":\n")) {
78                                                 _fs_fstab.fs_passno = atoi(cp);
79                                                 return(1);
80                                         }
81                                 }
82                         }
83                         goto bad;
84                 }
85 /* OLD_STYLE_FSTAB */
86                 _fs_fstab.fs_spec = strtok(cp, " \t\n");
87                 if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
88                         continue;
89                 _fs_fstab.fs_file = strtok((char *)NULL, " \t\n");
90                 _fs_fstab.fs_vfstype = strtok((char *)NULL, " \t\n");
91                 _fs_fstab.fs_mntops = strtok((char *)NULL, " \t\n");
92                 if (_fs_fstab.fs_mntops == NULL)
93                         goto bad;
94                 _fs_fstab.fs_freq = 0;
95                 _fs_fstab.fs_passno = 0;
96                 if ((cp = strtok((char *)NULL, " \t\n")) != NULL) {
97                         _fs_fstab.fs_freq = atoi(cp);
98                         if ((cp = strtok((char *)NULL, " \t\n")) != NULL)
99                                 _fs_fstab.fs_passno = atoi(cp);
100                 }
101                 strcpy(subline, _fs_fstab.fs_mntops);
102                 for (typexx = 0, cp = strtok(subline, ","); cp;
103                      cp = strtok((char *)NULL, ",")) {
104                         if (strlen(cp) != 2)
105                                 continue;
106                         if (!strcmp(cp, FSTAB_RW)) {
107                                 _fs_fstab.fs_type = FSTAB_RW;
108                                 break;
109                         }
110                         if (!strcmp(cp, FSTAB_RQ)) {
111                                 _fs_fstab.fs_type = FSTAB_RQ;
112                                 break;
113                         }
114                         if (!strcmp(cp, FSTAB_RO)) {
115                                 _fs_fstab.fs_type = FSTAB_RO;
116                                 break;
117                         }
118                         if (!strcmp(cp, FSTAB_SW)) {
119                                 _fs_fstab.fs_type = FSTAB_SW;
120                                 break;
121                         }
122                         if (!strcmp(cp, FSTAB_XX)) {
123                                 _fs_fstab.fs_type = FSTAB_XX;
124                                 typexx++;
125                                 break;
126                         }
127                 }
128                 if (typexx)
129                         continue;
130                 if (cp != NULL)
131                         return(1);
132
133 bad:            /* no way to distinguish between EOF and syntax error */
134                 error(EFTYPE);
135         }
136         /* NOTREACHED */
137 }
138
139 struct fstab *
140 getfsent()
141 {
142         if (!_fs_fp && !setfsent() || !fstabscan())
143                 return((struct fstab *)NULL);
144         return(&_fs_fstab);
145 }
146
147 struct fstab *
148 getfsspec(name)
149         register const char *name;
150 {
151         if (setfsent())
152                 while (fstabscan())
153                         if (!strcmp(_fs_fstab.fs_spec, name))
154                                 return(&_fs_fstab);
155         return((struct fstab *)NULL);
156 }
157
158 struct fstab *
159 getfsfile(name)
160         register const char *name;
161 {
162         if (setfsent())
163                 while (fstabscan())
164                         if (!strcmp(_fs_fstab.fs_file, name))
165                                 return(&_fs_fstab);
166         return((struct fstab *)NULL);
167 }
168
169 setfsent()
170 {
171         if (_fs_fp) {
172                 rewind(_fs_fp);
173                 return(1);
174         }
175         if (_fs_fp = fopen(_PATH_FSTAB, "r"))
176                 return(1);
177         error(errno);
178         return(0);
179 }
180
181 void
182 endfsent()
183 {
184         if (_fs_fp) {
185                 (void)fclose(_fs_fp);
186                 _fs_fp = NULL;
187         }
188 }
189
190 static
191 error(err)
192         int err;
193 {
194         char *p;
195
196         (void)write(STDERR_FILENO, "fstab: ", 7);
197         (void)write(STDERR_FILENO, _PATH_FSTAB, sizeof(_PATH_FSTAB) - 1);
198         (void)write(STDERR_FILENO, ": ", 1);
199         p = strerror(err);
200         (void)write(STDERR_FILENO, p, strlen(p));
201         (void)write(STDERR_FILENO, "\n", 1);
202 }