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
   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 1.5 1999/10/13 09:57:19 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
  54 static FILE *_fs_fp;
  55 static struct fstab _fs_fstab;
  56
  57 static void error __P((int));
  58 static int fstabscan __P((void));
  59
  60 static
  61 int fstabscan(void)
  62 {
  63         struct mntent   *mnt;
  64         register char *cp;
  65         int typexx;
  66 #define MAXLINELENGTH   1024
  67         char subline[MAXLINELENGTH];
  68
  69         for (;;) {
  70                 if (!(mnt = getmntent(_fs_fp)))
  71                         return 0;
  72
  73                 _fs_fstab.fs_spec = mnt->mnt_fsname;
  74                 _fs_fstab.fs_file = mnt->mnt_dir;
  75                 _fs_fstab.fs_vfstype = mnt->mnt_type;
  76                 _fs_fstab.fs_mntops = mnt->mnt_opts;
  77                 _fs_fstab.fs_type = FSTAB_RW;   /* rw by default under Linux */
  78                 _fs_fstab.fs_freq = mnt->mnt_freq;
  79                 _fs_fstab.fs_passno = mnt->mnt_passno;
  80
  81                 strcpy(subline, _fs_fstab.fs_mntops);
  82                 for (typexx = 0, cp = strtok(subline, ","); cp;
  83                      cp = strtok((char *)NULL, ",")) {
  84                         if (!strcmp(cp, FSTAB_RW)) {
  85                                 _fs_fstab.fs_type = FSTAB_RW;
  86                                 break;
  87                         }
  88                         if (!strcmp(cp, FSTAB_RQ)) {
  89                                 _fs_fstab.fs_type = FSTAB_RQ;
  90                                 break;
  91                         }
  92                         if (!strcmp(cp, FSTAB_RO)) {
  93                                 _fs_fstab.fs_type = FSTAB_RO;
  94                                 break;
  95                         }
  96                         if (!strcmp(cp, FSTAB_SW)) {
  97                                 _fs_fstab.fs_type = FSTAB_SW;
  98                                 break;
  99                         }
 100                         if (!strcmp(cp, FSTAB_XX)) {
 101                                 _fs_fstab.fs_type = FSTAB_XX;
 102                                 typexx++;
 103                                 break;
 104                         }
 105                 }
 106                 if (typexx)
 107                         continue;
 108
 109                 return 1;
 110         }
 111 }
 112
 113 struct fstab *
 114 getfsent(void)
 115 {
 116         if ((!_fs_fp && !setfsent()) || !fstabscan())
 117                 return((struct fstab *)NULL);
 118         return(&_fs_fstab);
 119 }
 120
 121 struct fstab *
 122 getfsspec(const char *name)
 123 {
 124         if (setfsent())
 125                 while (fstabscan())
 126                         if (!strcmp(_fs_fstab.fs_spec, name))
 127                                 return(&_fs_fstab);
 128         return((struct fstab *)NULL);
 129 }
 130
 131 struct fstab *
 132 getfsfile(const char *name)
 133 {
 134         if (setfsent())
 135                 while (fstabscan())
 136                         if (!strcmp(_fs_fstab.fs_file, name))
 137                                 return(&_fs_fstab);
 138         return((struct fstab *)NULL);
 139 }
 140
 141 int
 142 setfsent(void)
 143 {
 144         if (_fs_fp) {
 145                 rewind(_fs_fp);
 146                 return(1);
 147         }
 148         if ((_fs_fp = setmntent(_PATH_FSTAB, "r")))
 149                 return(1);
 150         error(errno);
 151         return(0);
 152 }
 153
 154 void
 155 endfsent(void)
 156 {
 157         if (_fs_fp) {
 158                 (void)endmntent(_fs_fp);
 159                 _fs_fp = NULL;
 160         }
 161 }
 162
 163 static
 164 void error(int err)
 165 {
 166         char *p;
 167
 168         (void)write(STDERR_FILENO, "fstab: ", 7);
 169         (void)write(STDERR_FILENO, _PATH_FSTAB, sizeof(_PATH_FSTAB) - 1);
 170         (void)write(STDERR_FILENO, ": ", 1);
 171         p = strerror(err);
 172         (void)write(STDERR_FILENO, p, strlen(p));
 173         (void)write(STDERR_FILENO, "\n", 1);
 174 }