blob: 4dc05c89849f78173f2a2ef47ee0efbe64252c8d (
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
|
/* number of bytes a page hold, not including the header */
#define PAGE_SIZE (16384 - sizeof(Page))
static void allocr_create(Allocator *a) {
a->first = a->last = NULL;
}
static void *allocr_malloc(Allocator *a, size_t bytes) {
/* position in this page to return */
size_t pos = PAGE_SIZE;
if (a->last)
pos = (a->last->used + sizeof(max_align_t) - 1) / sizeof(max_align_t);
if (pos * sizeof(max_align_t) + bytes > PAGE_SIZE) {
/* make a new page for this data */
Page *page = err_malloc(sizeof *page + (bytes > PAGE_SIZE ? bytes : PAGE_SIZE));
page->next = NULL;
page->used = bytes;
if (a->last)
a->last->next = page;
else
a->first = page;
a->last = page;
return page->data;
} else {
a->last->used += bytes;
return &a->last->data[pos];
}
}
static void *allocr_calloc(Allocator *a, size_t n, size_t sz) {
/* OPTIM: use calloc */
size_t bytes = n * sz;
void *data = allocr_malloc(a, bytes);
memset(data, 0, bytes);
return data;
}
/* OPTIM */
static void *allocr_realloc(Allocator *a, void *data, size_t old_size, size_t new_size) {
void *ret = allocr_malloc(a, new_size);
memcpy(ret, data, old_size);
return ret;
}
static void allocr_free_all(Allocator *a) {
for (Page *page = a->first; page;) {
Page *next = page->next;
free(page);
page = next;
}
}
|
