| /* Increase the size of a dynamic array. | |
| 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_resize (struct dynarray_header *list, size_t size, | |
| void *scratch, size_t element_size) | |
| { | |
| /* The existing allocation provides sufficient room. */ | |
| if (size <= list->allocated) | |
| { | |
| list->used = size; | |
| return true; | |
| } | |
| /* Otherwise, use size as the new allocation size. The caller is | |
| expected to provide the final size of the array, so there is no | |
| over-allocation here. */ | |
| size_t new_size_bytes; | |
| if (ckd_mul (&new_size_bytes, size, element_size)) | |
| { | |
| /* Overflow. */ | |
| __set_errno (ENOMEM); | |
| return false; | |
| } | |
| void *new_array; | |
| if (list->array == scratch) | |
| { | |
| /* The previous array was not heap-allocated. */ | |
| new_array = malloc (new_size_bytes); | |
| if (new_array != NULL && list->array != NULL) | |
| memcpy (new_array, list->array, list->used * element_size); | |
| } | |
| else | |
| new_array = realloc (list->array, new_size_bytes); | |
| if (new_array == NULL) | |
| return false; | |
| list->array = new_array; | |
| list->allocated = size; | |
| list->used = size; | |
| return true; | |
| } | |
| libc_hidden_def (__libc_dynarray_resize) | |