misc/fstab.c

   1 /*
   2 Copyright (C) 1995 Free Software Foundation, Inc.
   3 This file is part of the GNU C Library.
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 The GNU C Library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #include <fstab.h>
  21 #include <mntent.h>
  22 #include <stdio.h>
  23
  24 static FILE *fstab;
  25
  26 static FILE *
  27 fstab_stream (void)
  28 {
  29   if (! fstab)
  30     fstab = setmntent (_PATH_FSTAB, "r");
  31   return fstab;
  32 }
  33
  34 int
  35 setfsent (void)
  36 {
  37   if (fstab)
  38     {
  39       rewind (fstab);
  40       return 1;
  41     }
  42   else
  43     fstab = setmntent (_PATH_FSTAB, "r");
  44   return fstab ? 0 : 1;
  45 }
  46
  47 static struct fstab *
  48 mnt2fs (struct mntent *m)
  49 {
  50   static struct fstab f;
  51   f.fs_spec = m->mnt_fsname;
  52   f.fs_file = m->mnt_dir;
  53   f.fs_vfstype = m->mnt_type;
  54   f.fs_mntops = m->mnt_opts;
  55   f.fs_type = (hasmntopt (m, FSTAB_RW) ? (char *) FSTAB_RW :
  56                hasmntopt (m, FSTAB_RQ) ? (char *) FSTAB_RQ :
  57                hasmntopt (m, FSTAB_RO) ? (char *) FSTAB_RO :
  58                hasmntopt (m, FSTAB_SW) ? (char *) FSTAB_SW :
  59                hasmntopt (m, FSTAB_XX) ? (char *) FSTAB_XX :
  60                (char *) "??");
  61   f.fs_freq = m->mnt_freq;
  62   f.fs_passno = m->mnt_passno;
  63   return &f;
  64 }
  65
  66 struct fstab *
  67 getfsent (void)
  68 {
  69   FILE *s = fstab_stream ();
  70
  71   if (! s)
  72     return NULL;
  73
  74   return mnt2fs (getmntent (s));
  75 }
  76
  77 struct fstab *
  78 getfsspec (name)
  79      register const char *name;
  80 {
  81   struct mntent *m;
  82   if (setfsent ())
  83     while (m = getmntent (fstab))
  84       if (!strcmp (m->mnt_fsname, name))
  85         return mnt2fs (m);
  86   return NULL;
  87 }
  88
  89 struct fstab *
  90 getfsfile (name)
  91         register const char *name;
  92 {
  93   struct mntent *m;
  94   if (setfsent ())
  95     while (m = getmntent (fstab))
  96       if (!strcmp (m->mnt_dir, name))
  97         return mnt2fs (m);
  98   return NULL;
  99 }
 100
 101 void
 102 endfsent ()
 103 {
 104   if (fstab)
 105     {
 106       (void) endmntent (fstab);
 107       fstab = NULL;
 108     }
 109 }