1 /* Increase the size of a dynamic array.
2 Copyright (C) 2017-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU General Public
7 License as published by the Free Software Foundation; either
8 version 3 of the License, or (at your option) any later version.
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 General Public License for more details.
15 You should have received a copy of the GNU General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
20 # include <libc-config.h>
30 __libc_dynarray_resize (struct dynarray_header *list, size_t size,
31 void *scratch, size_t element_size)
33 /* The existing allocation provides sufficient room. */
34 if (size <= list->allocated)
40 /* Otherwise, use size as the new allocation size. The caller is
41 expected to provide the final size of the array, so there is no
42 over-allocation here. */
44 size_t new_size_bytes;
45 if (INT_MULTIPLY_WRAPV (size, element_size, &new_size_bytes))
52 if (list->array == scratch)
54 /* The previous array was not heap-allocated. */
55 new_array = malloc (new_size_bytes);
56 if (new_array != NULL && list->array != NULL)
57 memcpy (new_array, list->array, list->used * element_size);
60 new_array = realloc (list->array, new_size_bytes);
61 if (new_array == NULL)
63 list->array = new_array;
64 list->allocated = size;
68 libc_hidden_def (__libc_dynarray_resize)