1 /* Copy the dynamically-allocated area to an explicitly-sized heap allocation.
2 Copyright (C) 2017-2023 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 #ifndef _LIBC
20 # include <libc-config.h>
21 #endif
22
23 #include <dynarray.h>
24 #include <stdlib.h>
25 #include <string.h>
26
27 bool
28 __libc_dynarray_finalize (struct dynarray_header *list,
29 void *scratch, size_t element_size,
30 struct dynarray_finalize_result *result)
31 {
32 if (__dynarray_error (list))
33 /* The caller will reported the deferred error. */
34 return false;
35
36 size_t used = list->used;
37
38 /* Empty list. */
39 if (used == 0)
40 {
41 /* An empty list could still be backed by a heap-allocated
42 array. Free it if necessary. */
43 if (list->array != scratch)
44 free (list->array);
45 *result = (struct dynarray_finalize_result) { NULL, 0 };
46 return true;
47 }
48
49 size_t allocation_size = used * element_size;
50 void *heap_array = malloc (allocation_size);
51 if (heap_array != NULL)
52 {
53 /* The new array takes ownership of the strings. */
54 if (list->array != NULL)
55 memcpy (heap_array, list->array, allocation_size);
56 if (list->array != scratch)
57 free (list->array);
58 *result = (struct dynarray_finalize_result)
59 { .array = heap_array, .length = used };
60 return true;
61 }
62 else
63 /* The caller will perform the freeing operation. */
64 return false;
65 }
66 libc_hidden_def (__libc_dynarray_finalize)