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 mnt2fs (struct mntent *m)
  51 {
  52   static struct fstab f;
  53
  54   if (m == NULL)
  55     return NULL;
  56
  57   f.fs_spec = m->mnt_fsname;
  58   f.fs_file = m->mnt_dir;
  59   f.fs_vfstype = m->mnt_type;
  60   f.fs_mntops = m->mnt_opts;
  61   f.fs_type = (hasmntopt (m, FSTAB_RW) ? (char *) FSTAB_RW :
  62                hasmntopt (m, FSTAB_RQ) ? (char *) FSTAB_RQ :
  63                hasmntopt (m, FSTAB_RO) ? (char *) FSTAB_RO :
  64                hasmntopt (m, FSTAB_SW) ? (char *) FSTAB_SW :
  65                hasmntopt (m, FSTAB_XX) ? (char *) FSTAB_XX :
  66                (char *) "??");
  67   f.fs_freq = m->mnt_freq;
  68   f.fs_passno = m->mnt_passno;
  69   return &f;
  70 }
  71
  72 struct fstab *
  73 getfsent (void)
  74 {
  75   FILE *s = fstab_stream ();
  76
  77   if (! s)
  78     return NULL;
  79
  80   return mnt2fs (__getmntent_r (s, &mntres, buffer, sizeof buffer));
  81 }
  82
  83 struct fstab *
  84 getfsspec (name)
  85      register const char *name;
  86 {
  87   struct mntent *m;
  88   if (setfsent ())
  89     while (m = __getmntent_r (fstab, &mntres, buffer, sizeof buffer))
  90       if (!strcmp (m->mnt_fsname, name))
  91         return mnt2fs (m);
  92   return NULL;
  93 }
  94
  95 struct fstab *
  96 getfsfile (name)
  97      register const char *name;
  98 {
  99   struct mntent *m;
 100   if (setfsent ())
 101     while (m = __getmntent_r (fstab, &mntres, buffer, sizeof buffer))
 102       if (!strcmp (m->mnt_dir, name))
 103         return mnt2fs (m);
 104   return NULL;
 105 }
 106
 107 void
 108 endfsent ()
 109 {
 110   if (fstab)
 111     {
 112       (void) endmntent (fstab);
 113       fstab = NULL;
 114     }
 115 }