/* Utilities for reading/writing fstab, mtab, etc.

   Copyright (C) 1995-2018 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 Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <mntent.h>

#include <stdlib.h>

#include <libc-lock.h>

/* We don't want to allocate the static buffer all the time since it

   is not always used (in fact, rather infrequently).  Accept the

   extra cost of a `malloc'.  */

libc_freeres_ptr (static char *getmntent_buffer);

/* This is the size of the buffer.  This is really big.  */

#define BUFFER_SIZE	4096

static void

allocate (void)

{

  getmntent_buffer = (char *) malloc (BUFFER_SIZE);

}

struct mntent *

getmntent (FILE *stream)

{

  static struct mntent m;

  __libc_once_define (static, once);

  __libc_once (once, allocate);

  if (getmntent_buffer == NULL)

    /* If no core is available we don't have a chance to run the

       program successfully and so returning NULL is an acceptable

       result.  */

    return NULL;

  return __getmntent_r (stream, &m, getmntent_buffer, BUFFER_SIZE);

}