Merge from vendor branch BZIP:
[dragonfly.git] / lib / libc / gen / 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  * $FreeBSD: src/lib/libc/gen/fstab.c,v 1.8 2000/01/27 23:06:15 jasone Exp $
34  * $DragonFly: src/lib/libc/gen/fstab.c,v 1.6 2005/11/13 00:07:42 swildner Exp $
35  *
36  * @(#)fstab.c  8.1 (Berkeley) 6/4/93
37  * $FreeBSD: src/lib/libc/gen/fstab.c,v 1.8 2000/01/27 23:06:15 jasone Exp $
38  */
39
40 #include "namespace.h"
41 #include <sys/param.h>
42 #include <sys/mount.h>
43 #include <sys/stat.h>
44
45 #include <errno.h>
46 #include <fstab.h>
47 #include <paths.h>
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <string.h>
51 #include <unistd.h>
52 #include "un-namespace.h"
53
54 static FILE *_fs_fp;
55 static struct fstab _fs_fstab;
56 static int LineNo = 0;
57
58 static void error (int);
59 static void fixfsfile (void);
60 static int fstabscan (void);
61
62 static void
63 fixfsfile(void)
64 {
65         static char buf[sizeof(_PATH_DEV) + MNAMELEN];
66         struct stat sb;
67         struct statfs sf;
68
69         if (strcmp(_fs_fstab.fs_file, "/") != 0)
70                 return;
71         if (statfs("/", &sf) != 0)
72                 return;
73         if (sf.f_mntfromname[0] == '/')
74                 buf[0] = '\0';
75         else
76                 strcpy(buf, _PATH_DEV);
77         strcat(buf, sf.f_mntfromname);
78         if (stat(buf, &sb) != 0 ||
79             (!S_ISBLK(sb.st_mode) && !S_ISCHR(sb.st_mode)))
80                 return;
81         _fs_fstab.fs_spec = buf;
82 }
83
84 static int
85 fstabscan(void)
86 {
87         char *cp, *p;
88 #define MAXLINELENGTH   1024
89         static char line[MAXLINELENGTH];
90         char subline[MAXLINELENGTH];
91         int typexx;
92
93         for (;;) {
94
95                 if (!(p = fgets(line, sizeof(line), _fs_fp)))
96                         return(0);
97 /* OLD_STYLE_FSTAB */
98                 ++LineNo;
99                 if (*line == '#' || *line == '\n')
100                         continue;
101                 if (!strpbrk(p, " \t")) {
102                         _fs_fstab.fs_spec = strsep(&p, ":\n");
103                         _fs_fstab.fs_file = strsep(&p, ":\n");
104                         fixfsfile();
105                         _fs_fstab.fs_type = strsep(&p, ":\n");
106                         if (_fs_fstab.fs_type) {
107                                 if (!strcmp(_fs_fstab.fs_type, FSTAB_XX))
108                                         continue;
109                                 _fs_fstab.fs_mntops = _fs_fstab.fs_type;
110                                 _fs_fstab.fs_vfstype =
111                                     strcmp(_fs_fstab.fs_type, FSTAB_SW) ?
112                                     "ufs" : "swap";
113                                 if ((cp = strsep(&p, ":\n")) != NULL) {
114                                         _fs_fstab.fs_freq = atoi(cp);
115                                         if ((cp = strsep(&p, ":\n")) != NULL) {
116                                                 _fs_fstab.fs_passno = atoi(cp);
117                                                 return(1);
118                                         }
119                                 }
120                         }
121                         goto bad;
122                 }
123 /* OLD_STYLE_FSTAB */
124                 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
125                         ;
126                 _fs_fstab.fs_spec = cp;
127                 if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
128                         continue;
129                 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
130                         ;
131                 _fs_fstab.fs_file = cp;
132                 fixfsfile();
133                 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
134                         ;
135                 _fs_fstab.fs_vfstype = cp;
136                 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
137                         ;
138                 _fs_fstab.fs_mntops = cp;
139                 if (_fs_fstab.fs_mntops == NULL)
140                         goto bad;
141                 _fs_fstab.fs_freq = 0;
142                 _fs_fstab.fs_passno = 0;
143                 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
144                         ;
145                 if (cp != NULL) {
146                         _fs_fstab.fs_freq = atoi(cp);
147                         while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
148                                 ;
149                         if (cp != NULL)
150                                 _fs_fstab.fs_passno = atoi(cp);
151                 }
152                 strcpy(subline, _fs_fstab.fs_mntops);
153                 p = subline;
154                 for (typexx = 0, cp = strsep(&p, ","); cp;
155                      cp = strsep(&p, ",")) {
156                         if (strlen(cp) != 2)
157                                 continue;
158                         if (!strcmp(cp, FSTAB_RW)) {
159                                 _fs_fstab.fs_type = FSTAB_RW;
160                                 break;
161                         }
162                         if (!strcmp(cp, FSTAB_RQ)) {
163                                 _fs_fstab.fs_type = FSTAB_RQ;
164                                 break;
165                         }
166                         if (!strcmp(cp, FSTAB_RO)) {
167                                 _fs_fstab.fs_type = FSTAB_RO;
168                                 break;
169                         }
170                         if (!strcmp(cp, FSTAB_SW)) {
171                                 _fs_fstab.fs_type = FSTAB_SW;
172                                 break;
173                         }
174                         if (!strcmp(cp, FSTAB_XX)) {
175                                 _fs_fstab.fs_type = FSTAB_XX;
176                                 typexx++;
177                                 break;
178                         }
179                 }
180                 if (typexx)
181                         continue;
182                 if (cp != NULL)
183                         return(1);
184
185 bad:            /* no way to distinguish between EOF and syntax error */
186                 error(EFTYPE);
187         }
188         /* NOTREACHED */
189 }
190
191 struct fstab *
192 getfsent(void)
193 {
194         if ((!_fs_fp && !setfsent()) || !fstabscan())
195                 return((struct fstab *)NULL);
196         return(&_fs_fstab);
197 }
198
199 struct fstab *
200 getfsspec(const char *name)
201 {
202         if (setfsent())
203                 while (fstabscan())
204                         if (!strcmp(_fs_fstab.fs_spec, name))
205                                 return(&_fs_fstab);
206         return((struct fstab *)NULL);
207 }
208
209 struct fstab *
210 getfsfile(const char *name)
211 {
212         if (setfsent())
213                 while (fstabscan())
214                         if (!strcmp(_fs_fstab.fs_file, name))
215                                 return(&_fs_fstab);
216         return((struct fstab *)NULL);
217 }
218
219 int 
220 setfsent(void)
221 {
222         if (_fs_fp) {
223                 rewind(_fs_fp);
224                 LineNo = 0;
225                 return(1);
226         }
227         if ((_fs_fp = fopen(_PATH_FSTAB, "r")) != NULL) {
228                 LineNo = 0;
229                 return(1);
230         }
231         error(errno);
232         return(0);
233 }
234
235 void
236 endfsent(void)
237 {
238         if (_fs_fp) {
239                 fclose(_fs_fp);
240                 _fs_fp = NULL;
241         }
242 }
243
244 static void
245 error(int err)
246 {
247         char *p;
248         char num[30];
249
250         _write(STDERR_FILENO, "fstab: ", 7);
251         _write(STDERR_FILENO, _PATH_FSTAB, sizeof(_PATH_FSTAB) - 1);
252         _write(STDERR_FILENO, ":", 1);
253         sprintf(num, "%d: ", LineNo);
254         _write(STDERR_FILENO, num, strlen(num));
255         p = strerror(err);
256         _write(STDERR_FILENO, p, strlen(p));
257         _write(STDERR_FILENO, "\n", 1);
258 }