1 /* realloc() function that is glibc compatible.
2
3 Copyright (C) 1997, 2003-2004, 2006-2007, 2009-2023 Free Software
4 Foundation, Inc.
5
6 This file is free software: you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
10
11 This file is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License
17 along with this program. If not, see <https://www.gnu.org/licenses/>. */
18
19 /* written by Jim Meyering and Bruno Haible */
20
21 #include <config.h>
22
23 #include <stdlib.h>
24
25 #include <errno.h>
26
27 #include "xalloc-oversized.h"
28
29 /* Call the system's realloc below. This file does not define
30 _GL_USE_STDLIB_ALLOC because it needs Gnulib's malloc if present. */
31 #undef realloc
32
33 /* Change the size of an allocated block of memory P to N bytes,
34 with error checking. If P is NULL, use malloc. Otherwise if N is zero,
35 free P and return NULL. */
36
37 void *
38 rpl_realloc (void *p, size_t n)
39 {
40 if (p == NULL)
41 return malloc (n);
42
43 if (n == 0)
44 {
45 free (p);
46 return NULL;
47 }
48
49 if (xalloc_oversized (n, 1))
50 {
51 errno = ENOMEM;
52 return NULL;
53 }
54
55 void *result = realloc (p, n);
56
57 #if !HAVE_MALLOC_POSIX
58 if (result == NULL)
59 errno = ENOMEM;
60 #endif
61
62 return result;
63 }