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@cybercable.fr>, 1999-2000
   6  */
   7
   8 /*
   9  * Copyright (c) 1980, 1988, 1993
  10  *      The Regents of the University of California.  All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  * 3. All advertising materials mentioning features or use of this software
  21  *    must display the following acknowledgement:
  22  *      This product includes software developed by the University of
  23  *      California, Berkeley and its contributors.
  24  * 4. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  */
  40
  41 #ifndef lint
  42 static const char rcsid[] =
  43         "$Id: fstab.c,v 1.7 2000/08/20 19:41:24 stelian Exp $";
  44 #endif /* not lint */
  45
  46 #include <errno.h>
  47 #include <fstab.h>
  48 #include <mntent.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <unistd.h>
  53 #include <bylabel.h>
  54
  55 static FILE *_fs_fp;
  56 static struct fstab _fs_fstab;
  57
  58 static void error __P((int));
  59 static int fstabscan __P((void));
  60
  61 void msg __P((const char *fmt, ...));
  62
  63 static
  64 int fstabscan(void)
  65 {
  66         struct mntent   *mnt;
  67         register char *cp;
  68         int typexx;
  69 #define MAXLINELENGTH   1024
  70         char subline[MAXLINELENGTH];
  71         char *device_name;
  72
  73         for (;;) {
  74                 if (!(mnt = getmntent(_fs_fp)))
  75                         return 0;
  76
  77                 device_name = get_device_name(mnt->mnt_fsname);
  78                 if (!device_name) {
  79                         msg("Warning: unable to translate %s\n", mnt->mnt_fsname);
  80                         continue;
  81                 }
  82                 _fs_fstab.fs_spec = device_name;
  83                 _fs_fstab.fs_file = mnt->mnt_dir;
  84                 _fs_fstab.fs_vfstype = mnt->mnt_type;
  85                 _fs_fstab.fs_mntops = mnt->mnt_opts;
  86                 _fs_fstab.fs_type = FSTAB_RW;   /* rw by default under Linux */
  87                 _fs_fstab.fs_freq = mnt->mnt_freq;
  88                 _fs_fstab.fs_passno = mnt->mnt_passno;
  89
  90                 strcpy(subline, _fs_fstab.fs_mntops);
  91                 for (typexx = 0, cp = strtok(subline, ","); cp;
  92                      cp = strtok((char *)NULL, ",")) {
  93                         if (!strcmp(cp, FSTAB_RW)) {
  94                                 _fs_fstab.fs_type = FSTAB_RW;
  95                                 break;
  96                         }
  97                         if (!strcmp(cp, FSTAB_RQ)) {
  98                                 _fs_fstab.fs_type = FSTAB_RQ;
  99                                 break;
 100                         }
 101                         if (!strcmp(cp, FSTAB_RO)) {
 102                                 _fs_fstab.fs_type = FSTAB_RO;
 103                                 break;
 104                         }
 105                         if (!strcmp(cp, FSTAB_SW)) {
 106                                 _fs_fstab.fs_type = FSTAB_SW;
 107                                 break;
 108                         }
 109                         if (!strcmp(cp, FSTAB_XX)) {
 110                                 _fs_fstab.fs_type = FSTAB_XX;
 111                                 typexx++;
 112                                 break;
 113                         }
 114                 }
 115                 if (typexx)
 116                         continue;
 117
 118                 return 1;
 119         }
 120 }
 121
 122 struct fstab *
 123 getfsent(void)
 124 {
 125         if ((!_fs_fp && !setfsent()) || !fstabscan())
 126                 return((struct fstab *)NULL);
 127         return(&_fs_fstab);
 128 }
 129
 130 struct fstab *
 131 getfsspec(const char *name)
 132 {
 133         if (setfsent())
 134                 while (fstabscan())
 135                         if (!strcmp(_fs_fstab.fs_spec, name))
 136                                 return(&_fs_fstab);
 137         return((struct fstab *)NULL);
 138 }
 139
 140 struct fstab *
 141 getfsfile(const char *name)
 142 {
 143         if (setfsent())
 144                 while (fstabscan())
 145                         if (!strcmp(_fs_fstab.fs_file, name))
 146                                 return(&_fs_fstab);
 147         return((struct fstab *)NULL);
 148 }
 149
 150 int
 151 setfsent(void)
 152 {
 153         if (_fs_fp) {
 154                 rewind(_fs_fp);
 155                 return(1);
 156         }
 157         if ((_fs_fp = setmntent(_PATH_FSTAB, "r")))
 158                 return(1);
 159         error(errno);
 160         return(0);
 161 }
 162
 163 void
 164 endfsent(void)
 165 {
 166         if (_fs_fp) {
 167                 (void)endmntent(_fs_fp);
 168                 _fs_fp = NULL;
 169         }
 170 }
 171
 172 static
 173 void error(int err)
 174 {
 175         char *p;
 176
 177         (void)write(STDERR_FILENO, "fstab: ", 7);
 178         (void)write(STDERR_FILENO, _PATH_FSTAB, sizeof(_PATH_FSTAB) - 1);
 179         (void)write(STDERR_FILENO, ": ", 1);
 180         p = strerror(err);
 181         (void)write(STDERR_FILENO, p, strlen(p));
 182         (void)write(STDERR_FILENO, "\n", 1);
 183 }