1 /* Change the size of an allocated block.
2    Copyright (C) 2017-2021 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 
23 void *
__libc_reallocarray(void * optr,size_t nmemb,size_t elem_size)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 }
34 libc_hidden_def (__libc_reallocarray)
35 
36 weak_alias (__libc_reallocarray, reallocarray)
37