blob: 33f1667864b6141256ad2abfd619c904568b46eb (
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
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "array.h"
array_info* array_new_(size_t item_size, size_t size) {
// find capacity
size_t cap = 8;
if (size > cap) {
cap = size;
// round up to next power of 2
cap--;
cap |= cap >> 1;
cap |= cap >> 2;
cap |= cap >> 4;
cap |= cap >> 8;
cap |= cap >> 16;
cap++;
}
// make array
array_info* info = calloc(1, sizeof(array_info) + item_size * cap);
info->size = size;
info->capacity = cap;
return info;
}
void* array_add_(void* array, size_t item_size) {
array_info* info = NULL;
if (!array) {
info = array_new_(item_size, 0);
}
else {
info = ((array_info*)array) - 1;
}
if (info->size == info->capacity) {
info->capacity <<= 1;
info = realloc(info, sizeof(array_info) + (info->capacity * item_size));
}
info->size++;
return info->array;
}
void* array_resize_(void* array, size_t item_size, size_t size) {
array_info* info = NULL;
if (!array) {
info = array_new_(item_size, 0);
}
else {
info = ((array_info*)array) - 1;
}
if (size >= info->capacity) {
info->capacity = size;
info->capacity--;
info->capacity |= info->capacity >> 1;
info->capacity |= info->capacity >> 2;
info->capacity |= info->capacity >> 4;
info->capacity |= info->capacity >> 8;
info->capacity |= info->capacity >> 16;
info->capacity++;
info = realloc(info, sizeof(array_info) + (info->capacity * item_size));
}
if (size == -1) {
info->size++;
}
else {
info->size = size;
}
return info->array;
}
void array_print(void* array) {
array_info* info = &((array_info*)array)[-1];
printf( "size: %lu\n"
"capacity: %lu\n"
"array: %p\n",
info->size,
info->capacity,
info->array);
}
void array_pop(void* array) {
array_info* info = &((array_info*)array)[-1];
if (info->size)
info->size--;
}
|
