misc/fstab.c

   1 /*
   2 Copyright (C) 1995, 1996 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 static struct mntent mntres;
  26 static char buffer[8192];
  27
  28
  29 static FILE *
  30 fstab_stream (void)
  31 {
  32   if (! fstab)
  33     fstab = setmntent (_PATH_FSTAB, "r");
  34   return fstab;
  35 }
  36
  37 int
  38 setfsent (void)
  39 {
  40   if (fstab)
  41     {
  42       rewind (fstab);
  43       return 1;
  44     }
  45   else
  46     fstab = setmntent (_PATH_FSTAB, "r");
  47   return fstab ? 0 : 1;
  48 }
  49
  50 static struct fstab *
  51 mnt2fs (struct mntent *m)
  52 {
  53   static struct fstab f;
  54
  55   if (m == NULL)
  56     return NULL;
  57
  58   f.fs_spec = m->mnt_fsname;
  59   f.fs_file = m->mnt_dir;
  60   f.fs_vfstype = m->mnt_type;
  61   f.fs_mntops = m->mnt_opts;
  62   f.fs_type = (hasmntopt (m, FSTAB_RW) ? (char *) FSTAB_RW :
  63                hasmntopt (m, FSTAB_RQ) ? (char *) FSTAB_RQ :
  64                hasmntopt (m, FSTAB_RO) ? (char *) FSTAB_RO :
  65                hasmntopt (m, FSTAB_SW) ? (char *) FSTAB_SW :
  66                hasmntopt (m, FSTAB_XX) ? (char *) FSTAB_XX :
  67                (char *) "??");
  68   f.fs_freq = m->mnt_freq;
  69   f.fs_passno = m->mnt_passno;
  70   return &f;
  71 }
  72
  73 struct fstab *
  74 getfsent (void)
  75 {
  76   FILE *s = fstab_stream ();
  77
  78   if (! s)
  79     return NULL;
  80
  81   return mnt2fs (__getmntent_r (s, &mntres, buffer, sizeof buffer));
  82 }
  83
  84 struct fstab *
  85 getfsspec (name)
  86      register const char *name;
  87 {
  88   struct mntent *m;
  89   if (setfsent ())
  90     while (m = __getmntent_r (fstab, &mntres, buffer, sizeof buffer))
  91       if (!strcmp (m->mnt_fsname, name))
  92         return mnt2fs (m);
  93   return NULL;
  94 }
  95
  96 struct fstab *
  97 getfsfile (name)
  98      register const char *name;
  99 {
 100   struct mntent *m;
 101   if (setfsent ())
 102     while (m = __getmntent_r (fstab, &mntres, buffer, sizeof buffer))
 103       if (!strcmp (m->mnt_dir, name))
 104         return mnt2fs (m);
 105   return NULL;
 106 }
 107
 108 void
 109 endfsent ()
 110 {
 111   if (fstab)
 112     {
 113       (void) endmntent (fstab);
 114       fstab = NULL;
 115     }
 116 }