inet/getnetgrent.c

   1 /* Copyright (C) 1996-2018 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <netdb.h>
  20 #include <stdlib.h>
  21 #include <libc-lock.h>
  22
  23 /* Static buffer for return value.  We allocate it when needed.  */
  24 libc_freeres_ptr (static char *buffer);
  25 /* All three strings should fit in a block of 1kB size.  */
  26 #define BUFSIZE 1024
  27
  28
  29
  30 static void
  31 allocate (void)
  32 {
  33   buffer = (char *) malloc (BUFSIZE);
  34 }
  35
  36 int
  37 getnetgrent (char **hostp, char **userp, char **domainp)
  38 {
  39   __libc_once_define (static, once);
  40   __libc_once (once, allocate);
  41
  42   if (buffer == NULL)
  43     {
  44       __set_errno (ENOMEM);
  45       return -1;
  46     }
  47
  48   return __getnetgrent_r (hostp, userp, domainp, buffer, BUFSIZE);
  49 }