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glibc  2.9
getnetgrent.c
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00001 /* Copyright (C) 1996, 1997, 2000, 2002 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <netdb.h>
00021 #include <stdlib.h>
00022 #include <bits/libc-lock.h>
00023 
00024 /* Static buffer for return value.  We allocate it when needed.  */
00025 libc_freeres_ptr (static char *buffer);
00026 /* All three strings should fit in a block of 1kB size.  */
00027 #define BUFSIZE 1024
00028 
00029 
00030 
00031 static void
00032 allocate (void)
00033 {
00034   buffer = (char *) malloc (BUFSIZE);
00035 }
00036 
00037 int
00038 getnetgrent (char **hostp, char **userp, char **domainp)
00039 {
00040   __libc_once_define (static, once);
00041   __libc_once (once, allocate);
00042 
00043   if (buffer == NULL)
00044     {
00045       __set_errno (ENOMEM);
00046       return -1;
00047     }
00048 
00049   return __getnetgrent_r (hostp, userp, domainp, buffer, BUFSIZE);
00050 }