glibc/misc/fstab.c

/* 
Copyright (C) 1995 Free Software Foundation, Inc.
This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

#include <fstab.h>
#include <mntent.h>
#include <stdio.h>

static FILE *fstab;

static FILE *
fstab_stream (void)
{
  if (! fstab)
    fstab = setmntent (_PATH_FSTAB, "r");
  return fstab;
}

int
setfsent (void)
{
  if (fstab)
    {
      rewind (fstab);
      return 1;
    }
  else
    fstab = setmntent (_PATH_FSTAB, "r");
  return fstab ? 0 : 1;
}

static struct fstab *
mnt2fs (struct mntent *m)
{
  static struct fstab f;
  f.fs_spec = m->mnt_fsname;
  f.fs_file = m->mnt_dir;
  f.fs_vfstype = m->mnt_type;
  f.fs_mntops = m->mnt_opts;
  f.fs_type = (hasmntopt (m, FSTAB_RW) ? (char *) FSTAB_RW :
	       hasmntopt (m, FSTAB_RQ) ? (char *) FSTAB_RQ :
	       hasmntopt (m, FSTAB_RO) ? (char *) FSTAB_RO :
	       hasmntopt (m, FSTAB_SW) ? (char *) FSTAB_SW :
	       hasmntopt (m, FSTAB_XX) ? (char *) FSTAB_XX :
	       (char *) "??");
  f.fs_freq = m->mnt_freq;
  f.fs_passno = m->mnt_passno;
  return &f;
}

struct fstab *
getfsent (void)
{
  FILE *s = fstab_stream ();

  if (! s)
    return NULL;
  
  return mnt2fs (getmntent (s));
}

struct fstab *
getfsspec (name)
     register const char *name;
{
  struct mntent *m;
  if (setfsent ())
    while (m = getmntent (fstab))
      if (!strcmp (m->mnt_fsname, name))
	return mnt2fs (m);
  return NULL;
}

struct fstab *
getfsfile (name)
	register const char *name;
{
  struct mntent *m;
  if (setfsent ())
    while (m = getmntent (fstab))
      if (!strcmp (m->mnt_dir, name))
	return mnt2fs (m);
  return NULL;
}

void
endfsent ()
{
  if (fstab)
    {
      (void) endmntent (fstab);
      fstab = NULL;
    }
}