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
|
#include "dynamic_array.h"
#include <string.h>
void da_init(struct da_void *array, ptrdiff_t element_size,
ptrdiff_t size, struct kit_allocator alloc) {
memset(array, 0, sizeof(struct da_void));
if (size > 0)
array->values = alloc.allocate(alloc.state, element_size * size);
if (array->values != NULL) {
array->capacity = size;
array->size = size;
}
array->alloc = alloc;
}
static ptrdiff_t eval_capacity(ptrdiff_t current_cap,
ptrdiff_t required_cap) {
if (current_cap == 0)
return required_cap;
ptrdiff_t cap = current_cap;
while (cap < required_cap) cap *= 2;
return cap;
}
void da_resize(struct da_void *array, ptrdiff_t element_size,
ptrdiff_t size) {
if (size <= array->capacity) {
array->size = size;
} else {
ptrdiff_t capacity = eval_capacity(array->capacity, size);
void *bytes = array->alloc.allocate(array->alloc.state,
element_size * capacity);
if (bytes != NULL) {
if (array->size > 0)
memcpy(bytes, array->values, element_size * array->size);
if (array->values != NULL)
array->alloc.deallocate(array->alloc.state, array->values);
array->capacity = capacity;
array->size = size;
array->values = bytes;
}
}
}
|
