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 1.9 2000/12/04 15:43:16 stelian Exp $";
  45 #endif /* not lint */
  46
  47 #include <errno.h>
  48 #include <fstab.h>
  49 #include <mntent.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #include <unistd.h>
  54 #include <bylabel.h>
  55
  56 static FILE *_fs_fp;
  57 static struct fstab _fs_fstab;
  58
  59 static void error __P((int));
  60 static int fstabscan __P((void));
  61
  62 void msg __P((const char *fmt, ...));
  63
  64 static
  65 int fstabscan(void)
  66 {
  67         struct mntent   *mnt;
  68         register char *cp;
  69         int typexx;
  70 #define MAXLINELENGTH   1024
  71         char subline[MAXLINELENGTH];
  72         char *device_name;
  73
  74         for (;;) {
  75                 if (!(mnt = getmntent(_fs_fp)))
  76                         return 0;
  77
  78                 device_name = get_device_name(mnt->mnt_fsname);
  79                 if (!device_name) {
  80                         msg("Warning: unable to translate %s\n", mnt->mnt_fsname);
  81                         continue;
  82                 }
  83                 _fs_fstab.fs_spec = device_name;
  84                 _fs_fstab.fs_file = mnt->mnt_dir;
  85                 _fs_fstab.fs_vfstype = mnt->mnt_type;
  86                 _fs_fstab.fs_mntops = mnt->mnt_opts;
  87                 _fs_fstab.fs_type = FSTAB_RW;   /* rw by default under Linux */
  88                 _fs_fstab.fs_freq = mnt->mnt_freq;
  89                 _fs_fstab.fs_passno = mnt->mnt_passno;
  90
  91                 strcpy(subline, _fs_fstab.fs_mntops);
  92                 for (typexx = 0, cp = strtok(subline, ","); cp;
  93                      cp = strtok((char *)NULL, ",")) {
  94                         if (!strcmp(cp, FSTAB_RW)) {
  95                                 _fs_fstab.fs_type = FSTAB_RW;
  96                                 break;
  97                         }
  98                         if (!strcmp(cp, FSTAB_RQ)) {
  99                                 _fs_fstab.fs_type = FSTAB_RQ;
 100                                 break;
 101                         }
 102                         if (!strcmp(cp, FSTAB_RO)) {
 103                                 _fs_fstab.fs_type = FSTAB_RO;
 104                                 break;
 105                         }
 106                         if (!strcmp(cp, FSTAB_SW)) {
 107                                 _fs_fstab.fs_type = FSTAB_SW;
 108                                 break;
 109                         }
 110                         if (!strcmp(cp, FSTAB_XX)) {
 111                                 _fs_fstab.fs_type = FSTAB_XX;
 112                                 typexx++;
 113                                 break;
 114                         }
 115                 }
 116                 if (typexx)
 117                         continue;
 118
 119                 return 1;
 120         }
 121 }
 122
 123 struct fstab *
 124 getfsent(void)
 125 {
 126         if ((!_fs_fp && !setfsent()) || !fstabscan())
 127                 return((struct fstab *)NULL);
 128         return(&_fs_fstab);
 129 }
 130
 131 struct fstab *
 132 getfsspec(const char *name)
 133 {
 134         if (setfsent())
 135                 while (fstabscan())
 136                         if (!strcmp(_fs_fstab.fs_spec, name))
 137                                 return(&_fs_fstab);
 138         return((struct fstab *)NULL);
 139 }
 140
 141 struct fstab *
 142 getfsfile(const char *name)
 143 {
 144         if (setfsent())
 145                 while (fstabscan())
 146                         if (!strcmp(_fs_fstab.fs_file, name))
 147                                 return(&_fs_fstab);
 148         return((struct fstab *)NULL);
 149 }
 150
 151 int
 152 setfsent(void)
 153 {
 154         if (_fs_fp) {
 155                 rewind(_fs_fp);
 156                 return(1);
 157         }
 158         if ((_fs_fp = setmntent(_PATH_FSTAB, "r")))
 159                 return(1);
 160         error(errno);
 161         return(0);
 162 }
 163
 164 void
 165 endfsent(void)
 166 {
 167         if (_fs_fp) {
 168                 (void)endmntent(_fs_fp);
 169                 _fs_fp = NULL;
 170         }
 171 }
 172
 173 static
 174 void error(int err)
 175 {
 176         char *p;
 177
 178         (void)write(STDERR_FILENO, "fstab: ", 7);
 179         (void)write(STDERR_FILENO, _PATH_FSTAB, sizeof(_PATH_FSTAB) - 1);
 180         (void)write(STDERR_FILENO, ": ", 1);
 181         p = strerror(err);
 182         (void)write(STDERR_FILENO, p, strlen(p));
 183         (void)write(STDERR_FILENO, "\n", 1);
 184 }