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 }