1 /* Increase the size of a dynamic array and clear the new part.
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
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 #ifndef _LIBC
20 # include <libc-config.h>
21 #endif
22
23 #include <dynarray.h>
24 #include <string.h>
25
26 bool
27 __libc_dynarray_resize_clear (struct dynarray_header *list, size_t size,
28 void *scratch, size_t element_size)
29 {
30 size_t old_size = list->used;
31 if (!__libc_dynarray_resize (list, size, scratch, element_size))
32 return false;
33 /* __libc_dynarray_resize already checked for overflow. */
34 char *array = list->array;
35 memset (array + (old_size * element_size), 0,
36 (size - old_size) * element_size);
37 return true;
38 }
39 libc_hidden_def (__libc_dynarray_resize_clear)