inet/getnetgrent.c

   1 /* Copyright (C) 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 <errno.h>
  20 #include <netdb.h>
  21 #include <stdlib.h>
  22 #include <bits/libc-lock.h>
  23
  24 /* Statis buffer for return value.  We allocate it when needed.  */
  25 static char *buffer;
  26 /* All three strings should fit in a block of 1kB size.  */
  27 #define BUFSIZE 1024
  28
  29
  30
  31 static void
  32 allocate (void)
  33 {
  34   buffer = (char *) malloc (BUFSIZE);
  35 }
  36
  37 int
  38 getnetgrent (char **hostp, char **userp, char **domainp)
  39 {
  40   __libc_once_define (static, once);
  41   __libc_once (once, allocate);
  42
  43   if (buffer == NULL)
  44     {
  45       __set_errno (ENOMEM);
  46       return -1;
  47     }
  48
  49   return __getnetgrent_r (hostp, userp, domainp, buffer, BUFSIZE);
  50 }
  51
  52
  53 /* Make sure the memory is freed if the programs ends while in
  54    memory-debugging mode and something actually was allocated.  */
  55 static void
  56 __attribute__ ((unused))
  57 free_mem (void)
  58 {
  59   if (buffer != NULL)
  60     free (buffer);
  61 }
  62
  63 text_set_element (__libc_subfreeres, free_mem);