| /* Increase the size of a dynamic array in preparation of an emplace operation. |
| Copyright (C) 2017-2018 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 |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <dynarray.h> |
| #include <errno.h> |
| #include <malloc-internal.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| 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 (check_mul_overflow_size_t (new_allocated, element_size, &new_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) |
