1/* Utilities for reading/writing fstab, mtab, etc.
2 Copyright (C) 1995-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <mntent.h>
20#include <stdlib.h>
21#include <allocate_once.h>
22#include <set-freeres.h>
23
24struct mntent_buffer
25{
26 struct mntent m;
27 char buffer[4096];
28};
29
30/* We don't want to allocate the static buffer all the time since it
31 is not always used (in fact, rather infrequently). */
32static void *mntent_buffer;
33
34static void *
35allocate (void *closure)
36{
37 return malloc (sizeof (struct mntent_buffer));
38}
39
40static void
41deallocate (void *closure, void *ptr)
42{
43 free (ptr);
44}
45
46struct mntent *
47getmntent (FILE *stream)
48{
49 struct mntent_buffer *buffer = allocate_once (&mntent_buffer,
50 allocate, deallocate, NULL);
51 if (buffer == NULL)
52 /* If no core is available we don't have a chance to run the
53 program successfully and so returning NULL is an acceptable
54 result. */
55 return NULL;
56
57 return __getmntent_r (stream, &buffer->m,
58 buffer->buffer, sizeof (buffer->buffer));
59}
60
61weak_alias (mntent_buffer, __libc_mntent_freemem_ptr)
62