1/* Change the size of an allocated block.
2 Copyright (C) 2017-2023 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 License as
7 published by the Free Software Foundation; either version 2.1 of the
8 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; see the file COPYING.LIB. If
17 not, see <https://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <stdlib.h>
21#include <malloc.h>
22
23void *
24__libc_reallocarray (void *optr, size_t nmemb, size_t elem_size)
25{
26 size_t bytes;
27 if (__builtin_mul_overflow (nmemb, elem_size, &bytes))
28 {
29 __set_errno (ENOMEM);
30 return 0;
31 }
32 return realloc (optr, bytes);
33}
34libc_hidden_def (__libc_reallocarray)
35
36weak_alias (__libc_reallocarray, reallocarray)
37