glibc/inet/getnetgrent.c

/* Copyright (C) 1996, 1997 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., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <errno.h>
#include <netdb.h>
#include <stdlib.h>
#include <bits/libc-lock.h>

/* Statis buffer for return value.  We allocate it when needed.  */
static char *buffer;
/* All three strings should fit in a block of 1kB size.  */
#define BUFSIZE 1024



static void
allocate (void)
{
  buffer = (char *) malloc (BUFSIZE);
}

int
getnetgrent (char **hostp, char **userp, char **domainp)
{
  __libc_once_define (static, once);
  __libc_once (once, allocate);

  if (buffer == NULL)
    {
      __set_errno (ENOMEM);
      return -1;
    }

  return __getnetgrent_r (hostp, userp, domainp, buffer, BUFSIZE);
}


/* Make sure the memory is freed if the programs ends while in
   memory-debugging mode and something actually was allocated.  */
static void
__attribute__ ((unused))
free_mem (void)
{
  if (buffer != NULL)
    free (buffer);
}

text_set_element (__libc_subfreeres, free_mem);