misc/fstab.c

   1 /* Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  16    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17    Boston, MA 02111-1307, USA.  */
  18
  19 #include <fstab.h>
  20 #include <mntent.h>
  21 #include <stdio.h>
  22
  23 static FILE *fstab;
  24 static struct mntent mntres;
  25 static char buffer[8192];
  26
  27
  28 static FILE *
  29 fstab_stream (void)
  30 {
  31   if (! fstab)
  32     fstab = setmntent (_PATH_FSTAB, "r");
  33   return fstab;
  34 }
  35
  36 int
  37 setfsent (void)
  38 {
  39   if (fstab)
  40     {
  41       rewind (fstab);
  42       return 1;
  43     }
  44   else
  45     fstab = setmntent (_PATH_FSTAB, "r");
  46   return fstab ? 0 : 1;
  47 }
  48
  49 static struct fstab *
  50 internal_function
  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 }