1 /* Copyright (C) 1991,1996,1997,1999,2000,2002 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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/>. */
20 #include <bits/libc-lock.h>
25 /* We need to protect the dynamic buffer handling. */
26 __libc_lock_define_initialized (static, lock);
28 libc_freeres_ptr (static char *buffer);
30 /* Read one entry from the given stream. */
32 fgetgrent (FILE *stream)
34 static size_t buffer_size;
35 static struct group resbuf;
40 if (__builtin_expect (fgetpos (stream, &pos), 0) != 0)
44 __libc_lock_lock (lock);
46 /* Allocate buffer if not yet available. */
49 buffer_size = NSS_BUFLEN_GROUP;
50 buffer = malloc (buffer_size);
54 && (__fgetgrent_r (stream, &resbuf, buffer, buffer_size, &result)
58 buffer_size += NSS_BUFLEN_GROUP;
59 new_buf = realloc (buffer, buffer_size);
60 if (__builtin_expect (new_buf == NULL, 0))
62 /* We are out of memory. Free the current buffer so that the
63 process gets a chance for a normal termination. */
70 /* Reset the stream. */
71 if (fsetpos (stream, &pos) != 0)
78 /* Release lock. Preserve error value. */
80 __libc_lock_unlock (lock);