text: /* Utilities for reading/writing fstab, mtab, etc.
     Copyright (C) 1995-2016 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);
  }
  