(_hurd_sig_post): __sig_post renamed to __msg_sig_post.
[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 #ifndef EFTYPE
46 #define EFTYPE EINVAL
47 #endif
48
49 static FILE *_fs_fp;
50 static struct fstab _fs_fstab;
51
52 static void error __P((int));
53
54 static int
55 fstabscan __P((void))
56 {
57         register char *cp;
58 #define MAXLINELENGTH   1024
59         static char line[MAXLINELENGTH];
60         char subline[MAXLINELENGTH];
61         int typexx;
62
63         for (;;) {
64                 if (!(cp = fgets(line, sizeof(line), _fs_fp)))
65                         return(0);
66 /* OLD_STYLE_FSTAB */
67                 if (!strpbrk(cp, " \t")) {
68                         _fs_fstab.fs_spec = strtok(cp, ":\n");
69                         _fs_fstab.fs_file = strtok((char *)NULL, ":\n");
70                         _fs_fstab.fs_type = strtok((char *)NULL, ":\n");
71                         if (_fs_fstab.fs_type) {
72                                 if (!strcmp(_fs_fstab.fs_type, FSTAB_XX))
73                                         continue;
74                                 _fs_fstab.fs_mntops = _fs_fstab.fs_type;
75                                 _fs_fstab.fs_vfstype =
76                                     strcmp(_fs_fstab.fs_type, FSTAB_SW) ?
77                                     "ufs" : "swap";
78                                 if (cp = strtok((char *)NULL, ":\n")) {
79                                         _fs_fstab.fs_freq = atoi(cp);
80                                         if (cp = strtok((char *)NULL, ":\n")) {
81                                                 _fs_fstab.fs_passno = atoi(cp);
82                                                 return(1);
83                                         }
84                                 }
85                         }
86                         goto bad;
87                 }
88 /* OLD_STYLE_FSTAB */
89                 _fs_fstab.fs_spec = strtok(cp, " \t\n");
90                 if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
91                         continue;
92                 _fs_fstab.fs_file = strtok((char *)NULL, " \t\n");
93                 _fs_fstab.fs_vfstype = strtok((char *)NULL, " \t\n");
94                 _fs_fstab.fs_mntops = strtok((char *)NULL, " \t\n");
95                 if (_fs_fstab.fs_mntops == NULL)
96                         goto bad;
97                 _fs_fstab.fs_freq = 0;
98                 _fs_fstab.fs_passno = 0;
99                 if ((cp = strtok((char *)NULL, " \t\n")) != NULL) {
100                         _fs_fstab.fs_freq = atoi(cp);
101                         if ((cp = strtok((char *)NULL, " \t\n")) != NULL)
102                                 _fs_fstab.fs_passno = atoi(cp);
103                 }
104                 strcpy(subline, _fs_fstab.fs_mntops);
105                 for (typexx = 0, cp = strtok(subline, ","); cp;
106                      cp = strtok((char *)NULL, ",")) {
107                         if (strlen(cp) != 2)
108                                 continue;
109                         if (!strcmp(cp, FSTAB_RW)) {
110                                 _fs_fstab.fs_type = FSTAB_RW;
111                                 break;
112                         }
113                         if (!strcmp(cp, FSTAB_RQ)) {
114                                 _fs_fstab.fs_type = FSTAB_RQ;
115                                 break;
116                         }
117                         if (!strcmp(cp, FSTAB_RO)) {
118                                 _fs_fstab.fs_type = FSTAB_RO;
119                                 break;
120                         }
121                         if (!strcmp(cp, FSTAB_SW)) {
122                                 _fs_fstab.fs_type = FSTAB_SW;
123                                 break;
124                         }
125                         if (!strcmp(cp, FSTAB_XX)) {
126                                 _fs_fstab.fs_type = FSTAB_XX;
127                                 typexx++;
128                                 break;
129                         }
130                 }
131                 if (typexx)
132                         continue;
133                 if (cp != NULL)
134                         return(1);
135
136 bad:            /* no way to distinguish between EOF and syntax error */
137                 error(EFTYPE);
138         }
139         /* NOTREACHED */
140 }
141
142 struct fstab *
143 getfsent()
144 {
145         if (!_fs_fp && !setfsent() || !fstabscan())
146                 return((struct fstab *)NULL);
147         return(&_fs_fstab);
148 }
149
150 struct fstab *
151 getfsspec(name)
152         register const char *name;
153 {
154         if (setfsent())
155                 while (fstabscan())
156                         if (!strcmp(_fs_fstab.fs_spec, name))
157                                 return(&_fs_fstab);
158         return((struct fstab *)NULL);
159 }
160
161 struct fstab *
162 getfsfile(name)
163         register const char *name;
164 {
165         if (setfsent())
166                 while (fstabscan())
167                         if (!strcmp(_fs_fstab.fs_file, name))
168                                 return(&_fs_fstab);
169         return((struct fstab *)NULL);
170 }
171
172 setfsent()
173 {
174         if (_fs_fp) {
175                 rewind(_fs_fp);
176                 return(1);
177         }
178         if (_fs_fp = fopen(_PATH_FSTAB, "r"))
179                 return(1);
180         error(errno);
181         return(0);
182 }
183
184 void
185 endfsent()
186 {
187         if (_fs_fp) {
188                 (void)fclose(_fs_fp);
189                 _fs_fp = NULL;
190         }
191 }
192
193 static void
194 error(err)
195         int err;
196 {
197         char *p;
198
199         (void)write(STDERR_FILENO, "fstab: ", 7);
200         (void)write(STDERR_FILENO, _PATH_FSTAB, sizeof(_PATH_FSTAB) - 1);
201         (void)write(STDERR_FILENO, ": ", 1);
202         p = strerror(err);
203         (void)write(STDERR_FILENO, p, strlen(p));
204         (void)write(STDERR_FILENO, "\n", 1);
205 }