| /* Increase the size of a dynamic array in preparation of an emplace operation. | |
| Copyright (C) 2017-2025 Free Software Foundation, Inc. | |
| This file is part of the GNU C Library. | |
| The GNU C Library is free software; you can redistribute it and/or | |
| modify it under the terms of the GNU Lesser General Public | |
| License as published by the Free Software Foundation; either | |
| version 2.1 of the License, or (at your option) any later version. | |
| The GNU C Library is distributed in the hope that it will be useful, | |
| but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| Lesser General Public License for more details. | |
| You should have received a copy of the GNU Lesser General Public | |
| License along with the GNU C Library; if not, see | |
| <https://www.gnu.org/licenses/>. */ | |
| bool | |
| __libc_dynarray_emplace_enlarge (struct dynarray_header *list, | |
| void *scratch, size_t element_size) | |
| { | |
| size_t new_allocated; | |
| if (list->allocated == 0) | |
| { | |
| /* No scratch buffer provided. Choose a reasonable default | |
| size. */ | |
| if (element_size < 4) | |
| new_allocated = 16; | |
| else if (element_size < 8) | |
| new_allocated = 8; | |
| else | |
| new_allocated = 4; | |
| } | |
| else | |
| /* Increase the allocated size, using an exponential growth | |
| policy. */ | |
| { | |
| new_allocated = list->allocated + list->allocated / 2 + 1; | |
| if (new_allocated <= list->allocated) | |
| { | |
| /* Overflow. */ | |
| __set_errno (ENOMEM); | |
| return false; | |
| } | |
| } | |
| size_t new_size; | |
| if (ckd_mul (&new_size, new_allocated, element_size)) | |
| return false; | |
| void *new_array; | |
| if (list->array == scratch) | |
| { | |
| /* The previous array was not heap-allocated. */ | |
| new_array = malloc (new_size); | |
| if (new_array != NULL && list->array != NULL) | |
| memcpy (new_array, list->array, list->used * element_size); | |
| } | |
| else | |
| new_array = realloc (list->array, new_size); | |
| if (new_array == NULL) | |
| return false; | |
| list->array = new_array; | |
| list->allocated = new_allocated; | |
| return true; | |
| } | |
| libc_hidden_def (__libc_dynarray_emplace_enlarge) | |