compat/lib/fstab.c

   1 /*
   2  *      Ported to Linux's Second Extended File System as part of the
   3  *      dump and restore backup suit
   4  *      Remy Card <card@Linux.EU.Org>, 1994-1997
   5  *      Stelian Pop <pop@noos.fr>, 1999-2000
   6  *      Stelian Pop <pop@noos.fr> - Alcôve <www.alcove.fr>, 2000
   7  */
   8
   9 /*
  10  * Copyright (c) 1980, 1988, 1993
  11  *      The Regents of the University of California.  All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgement:
  23  *      This product includes software developed by the University of
  24  *      California, Berkeley and its contributors.
  25  * 4. Neither the name of the University nor the names of its contributors
  26  *    may be used to endorse or promote products derived from this software
  27  *    without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  39  * SUCH DAMAGE.
  40  */
  41
  42 #ifndef lint
  43 static const char rcsid[] =
  44         "$Id: fstab.c,v 1.11 2001/03/19 13:22:48 stelian Exp $";
  45 #endif /* not lint */
  46
  47 #include <config.h>
  48 #include <errno.h>
  49 #include <fstab.h>
  50 #include <mntent.h>
  51 #include <stdio.h>
  52 #include <stdlib.h>
  53 #include <string.h>
  54 #include <unistd.h>
  55 #include <bylabel.h>
  56
  57 static FILE *_fs_fp;
  58 static struct fstab _fs_fstab;
  59
  60 static void error __P((int));
  61 static int fstabscan __P((void));
  62
  63 void msg __P((const char *fmt, ...));
  64
  65 static
  66 int fstabscan(void)
  67 {
  68         struct mntent   *mnt;
  69         register char *cp;
  70         int typexx;
  71 #define MAXLINELENGTH   1024
  72         char subline[MAXLINELENGTH];
  73
  74         for (;;) {
  75                 const char *device_name;
  76                 if (!(mnt = getmntent(_fs_fp)))
  77                         return 0;
  78
  79                 device_name = get_device_name(mnt->mnt_fsname);
  80                 if (!device_name) {
  81                         msg("Warning: unable to translate %s\n", mnt->mnt_fsname);
  82                         continue;
  83                 }
  84                 _fs_fstab.fs_spec = device_name;
  85                 _fs_fstab.fs_file = mnt->mnt_dir;
  86                 _fs_fstab.fs_vfstype = mnt->mnt_type;
  87                 _fs_fstab.fs_mntops = mnt->mnt_opts;
  88                 _fs_fstab.fs_type = FSTAB_RW;   /* rw by default under Linux */
  89                 _fs_fstab.fs_freq = mnt->mnt_freq;
  90                 _fs_fstab.fs_passno = mnt->mnt_passno;
  91
  92                 strcpy(subline, _fs_fstab.fs_mntops);
  93                 for (typexx = 0, cp = strtok(subline, ","); cp;
  94                      cp = strtok((char *)NULL, ",")) {
  95                         if (!strcmp(cp, FSTAB_RW)) {
  96                                 _fs_fstab.fs_type = FSTAB_RW;
  97                                 break;
  98                         }
  99                         if (!strcmp(cp, FSTAB_RQ)) {
 100                                 _fs_fstab.fs_type = FSTAB_RQ;
 101                                 break;
 102                         }
 103                         if (!strcmp(cp, FSTAB_RO)) {
 104                                 _fs_fstab.fs_type = FSTAB_RO;
 105                                 break;
 106                         }
 107                         if (!strcmp(cp, FSTAB_SW)) {
 108                                 _fs_fstab.fs_type = FSTAB_SW;
 109                                 break;
 110                         }
 111                         if (!strcmp(cp, FSTAB_XX)) {
 112                                 _fs_fstab.fs_type = FSTAB_XX;
 113                                 typexx++;
 114                                 break;
 115                         }
 116                 }
 117                 if (typexx)
 118                         continue;
 119
 120                 return 1;
 121         }
 122 }
 123
 124 struct fstab *
 125 getfsent(void)
 126 {
 127         if ((!_fs_fp && !setfsent()) || !fstabscan())
 128                 return((struct fstab *)NULL);
 129         return(&_fs_fstab);
 130 }
 131
 132 struct fstab *
 133 getfsspec(const char *name)
 134 {
 135         if (setfsent())
 136                 while (fstabscan())
 137                         if (!strcmp(_fs_fstab.fs_spec, name))
 138                                 return(&_fs_fstab);
 139         return((struct fstab *)NULL);
 140 }
 141
 142 struct fstab *
 143 getfsfile(const char *name)
 144 {
 145         if (setfsent())
 146                 while (fstabscan())
 147                         if (!strcmp(_fs_fstab.fs_file, name))
 148                                 return(&_fs_fstab);
 149         return((struct fstab *)NULL);
 150 }
 151
 152 int
 153 setfsent(void)
 154 {
 155         if (_fs_fp) {
 156                 rewind(_fs_fp);
 157                 return(1);
 158         }
 159         if ((_fs_fp = setmntent(_PATH_FSTAB, "r")))
 160                 return(1);
 161         error(errno);
 162         return(0);
 163 }
 164
 165 void
 166 endfsent(void)
 167 {
 168         if (_fs_fp) {
 169                 (void)endmntent(_fs_fp);
 170                 _fs_fp = NULL;
 171         }
 172 }
 173
 174 static
 175 void error(int err)
 176 {
 177         char *p;
 178
 179         (void)write(STDERR_FILENO, "fstab: ", 7);
 180         (void)write(STDERR_FILENO, _PATH_FSTAB, sizeof(_PATH_FSTAB) - 1);
 181         (void)write(STDERR_FILENO, ": ", 1);
 182         p = strerror(err);
 183         (void)write(STDERR_FILENO, p, strlen(p));
 184         (void)write(STDERR_FILENO, "\n", 1);
 185 }