1 /* Test of realloc function.
2 Copyright (C) 2010-2021 Free Software Foundation, Inc.
3
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
8
9 This program 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
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17 #include <config.h>
18
19 /* Specification. */
20 #include <stdlib.h>
21
22 #include <errno.h>
23 #include <stdint.h>
24
25 #include "macros.h"
26
27 int
main(int argc,char ** argv)28 main (int argc, char **argv)
29 {
30 /* Check that realloc (NULL, 0) is not a NULL pointer. */
31 void *volatile p = realloc (NULL, 0);
32 ASSERT (p != NULL);
33
34 /* Check that realloc (p, n) fails when p is non-null and n exceeds
35 PTRDIFF_MAX. */
36 if (PTRDIFF_MAX < SIZE_MAX)
37 {
38 size_t one = argc != 12345;
39 p = realloc (p, PTRDIFF_MAX + one);
40 ASSERT (p == NULL);
41 /* Avoid a test failure due to glibc bug
42 <https://sourceware.org/bugzilla/show_bug.cgi?id=27870>. */
43 if (!getenv ("MALLOC_CHECK_"))
44 ASSERT (errno == ENOMEM);
45 }
46
47 free (p);
48 return 0;
49 }
50