blob: 4f41e28321698b390f09f684e20fd7fb05dc2ca9 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
/* Increase the size of a dynamic array in preparation of an emplace operation.
Copyright (C) 2017-2020 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/>. */
#include <dynarray.h>
#include <errno.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 (__builtin_mul_overflow (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)
|
