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 /*
  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  * $Id: fstab.c,v 1.4 1999/10/11 13:31:10 stelian Exp $
  42  */
  43
  44 #include <errno.h>
  45 #include <fstab.h>
  46 #include <mntent.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51
  52 static FILE *_fs_fp;
  53 static struct fstab _fs_fstab;
  54
  55 static void error __P((int));
  56 static int fstabscan __P((void));
  57
  58 static
  59 int fstabscan(void)
  60 {
  61         struct mntent   *mnt;
  62         register char *cp;
  63         int typexx;
  64 #define MAXLINELENGTH   1024
  65         char subline[MAXLINELENGTH];
  66
  67         for (;;) {
  68                 if (!(mnt = getmntent(_fs_fp)))
  69                         return 0;
  70
  71                 _fs_fstab.fs_spec = mnt->mnt_fsname;
  72                 _fs_fstab.fs_file = mnt->mnt_dir;
  73                 _fs_fstab.fs_vfstype = mnt->mnt_type;
  74                 _fs_fstab.fs_mntops = mnt->mnt_opts;
  75                 _fs_fstab.fs_type = FSTAB_RW;   /* rw by default under Linux */
  76                 _fs_fstab.fs_freq = mnt->mnt_freq;
  77                 _fs_fstab.fs_passno = mnt->mnt_passno;
  78
  79                 strcpy(subline, _fs_fstab.fs_mntops);
  80                 for (typexx = 0, cp = strtok(subline, ","); cp;
  81                      cp = strtok((char *)NULL, ",")) {
  82                         if (!strcmp(cp, FSTAB_RW)) {
  83                                 _fs_fstab.fs_type = FSTAB_RW;
  84                                 break;
  85                         }
  86                         if (!strcmp(cp, FSTAB_RQ)) {
  87                                 _fs_fstab.fs_type = FSTAB_RQ;
  88                                 break;
  89                         }
  90                         if (!strcmp(cp, FSTAB_RO)) {
  91                                 _fs_fstab.fs_type = FSTAB_RO;
  92                                 break;
  93                         }
  94                         if (!strcmp(cp, FSTAB_SW)) {
  95                                 _fs_fstab.fs_type = FSTAB_SW;
  96                                 break;
  97                         }
  98                         if (!strcmp(cp, FSTAB_XX)) {
  99                                 _fs_fstab.fs_type = FSTAB_XX;
 100                                 typexx++;
 101                                 break;
 102                         }
 103                 }
 104                 if (typexx)
 105                         continue;
 106
 107                 return 1;
 108         }
 109 }
 110
 111 struct fstab *
 112 getfsent(void)
 113 {
 114         if ((!_fs_fp && !setfsent()) || !fstabscan())
 115                 return((struct fstab *)NULL);
 116         return(&_fs_fstab);
 117 }
 118
 119 struct fstab *
 120 getfsspec(const char *name)
 121 {
 122         if (setfsent())
 123                 while (fstabscan())
 124                         if (!strcmp(_fs_fstab.fs_spec, name))
 125                                 return(&_fs_fstab);
 126         return((struct fstab *)NULL);
 127 }
 128
 129 struct fstab *
 130 getfsfile(const char *name)
 131 {
 132         if (setfsent())
 133                 while (fstabscan())
 134                         if (!strcmp(_fs_fstab.fs_file, name))
 135                                 return(&_fs_fstab);
 136         return((struct fstab *)NULL);
 137 }
 138
 139 int
 140 setfsent(void)
 141 {
 142         if (_fs_fp) {
 143                 rewind(_fs_fp);
 144                 return(1);
 145         }
 146         if ((_fs_fp = setmntent(_PATH_FSTAB, "r")))
 147                 return(1);
 148         error(errno);
 149         return(0);
 150 }
 151
 152 void
 153 endfsent(void)
 154 {
 155         if (_fs_fp) {
 156                 (void)endmntent(_fs_fp);
 157                 _fs_fp = NULL;
 158         }
 159 }
 160
 161 static
 162 void error(int err)
 163 {
 164         char *p;
 165
 166         (void)write(STDERR_FILENO, "fstab: ", 7);
 167         (void)write(STDERR_FILENO, _PATH_FSTAB, sizeof(_PATH_FSTAB) - 1);
 168         (void)write(STDERR_FILENO, ": ", 1);
 169         p = strerror(err);
 170         (void)write(STDERR_FILENO, p, strlen(p));
 171         (void)write(STDERR_FILENO, "\n", 1);
 172 }