1 /* Increase the size of a dynamic array in preparation of an emplace operation.
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_emplace_enlarge (struct dynarray_header *list,
31 void *scratch, size_t element_size)
34 if (list->allocated == 0)
36 /* No scratch buffer provided. Choose a reasonable default
40 else if (element_size < 8)
46 /* Increase the allocated size, using an exponential growth
49 new_allocated = list->allocated + list->allocated / 2 + 1;
50 if (new_allocated <= list->allocated)
59 if (INT_MULTIPLY_WRAPV (new_allocated, element_size, &new_size))
62 if (list->array == scratch)
64 /* The previous array was not heap-allocated. */
65 new_array = malloc (new_size);
66 if (new_array != NULL && list->array != NULL)
67 memcpy (new_array, list->array, list->used * element_size);
70 new_array = realloc (list->array, new_size);
71 if (new_array == NULL)
73 list->array = new_array;
74 list->allocated = new_allocated;
77 libc_hidden_def (__libc_dynarray_emplace_enlarge)