1 /* Copy the dynamically-allocated area to an explicitly-sized heap allocation.
2 Copyright (C) 2017-2021 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
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 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 #include <dynarray.h>
20 #include <stdlib.h>
21 #include <string.h>
22
23 bool
__libc_dynarray_finalize(struct dynarray_header * list,void * scratch,size_t element_size,struct dynarray_finalize_result * result)24 __libc_dynarray_finalize (struct dynarray_header *list,
25 void *scratch, size_t element_size,
26 struct dynarray_finalize_result *result)
27 {
28 if (__dynarray_error (list))
29 /* The caller will reported the deferred error. */
30 return false;
31
32 size_t used = list->used;
33
34 /* Empty list. */
35 if (used == 0)
36 {
37 /* An empty list could still be backed by a heap-allocated
38 array. Free it if necessary. */
39 if (list->array != scratch)
40 free (list->array);
41 *result = (struct dynarray_finalize_result) { NULL, 0 };
42 return true;
43 }
44
45 size_t allocation_size = used * element_size;
46 void *heap_array = malloc (allocation_size);
47 if (heap_array != NULL)
48 {
49 /* The new array takes ownership of the strings. */
50 if (list->array != NULL)
51 memcpy (heap_array, list->array, allocation_size);
52 if (list->array != scratch)
53 free (list->array);
54 *result = (struct dynarray_finalize_result)
55 { .array = heap_array, .length = used };
56 return true;
57 }
58 else
59 /* The caller will perform the freeing operation. */
60 return false;
61 }
62 libc_hidden_def (__libc_dynarray_finalize)
63