xref: /PHP-5.6/Zend/zend_dynamic_array.c (revision 3537e95d)
1 /*
2    +----------------------------------------------------------------------+
3    | Zend Engine                                                          |
4    +----------------------------------------------------------------------+
5    | Copyright (c) 1998-2016 Zend Technologies Ltd. (http://www.zend.com) |
6    +----------------------------------------------------------------------+
7    | This source file is subject to version 2.00 of the Zend license,     |
8    | that is bundled with this package in the file LICENSE, and is        |
9    | available through the world-wide-web at the following url:           |
10    | http://www.zend.com/license/2_00.txt.                                |
11    | If you did not receive a copy of the Zend license and are unable to  |
12    | obtain it through the world-wide-web, please send a note to          |
13    | license@zend.com so we can mail you a copy immediately.              |
14    +----------------------------------------------------------------------+
15    | Authors: Andi Gutmans <andi@zend.com>                                |
16    |          Zeev Suraski <zeev@zend.com>                                |
17    +----------------------------------------------------------------------+
18 */
19 
20 /* $Id$ */
21 
22 #include "zend.h"
23 
24 typedef struct _dynamic_array {
25         char *array;
26         unsigned int element_size;
27         unsigned int current;
28         unsigned int allocated;
29 } dynamic_array;
30 
zend_dynamic_array_init(dynamic_array * da,unsigned int element_size,unsigned int size)31 ZEND_API int zend_dynamic_array_init(dynamic_array *da, unsigned int element_size, unsigned int size)
32 {
33 	da->element_size = element_size;
34 	da->allocated = size;
35 	da->current = 0;
36 	da->array = (char *) emalloc(size*element_size);
37 	if (da->array == NULL) {
38 		return 1;
39 	}
40 	return 0;
41 }
42 
zend_dynamic_array_push(dynamic_array * da)43 ZEND_API void *zend_dynamic_array_push(dynamic_array *da)
44 {
45 	if (da->current == da->allocated) {
46 		da->allocated *= 2;
47 		da->array = (char *) erealloc(da->array, da->allocated*da->element_size);
48 	}
49 	return (void *)(da->array+(da->current++)*da->element_size);
50 }
51 
zend_dynamic_array_pop(dynamic_array * da)52 ZEND_API void *zend_dynamic_array_pop(dynamic_array *da)
53 {
54 	return (void *)(da->array+(--(da->current))*da->element_size);
55 
56 }
57 
zend_dynamic_array_get_element(dynamic_array * da,unsigned int index)58 ZEND_API void *zend_dynamic_array_get_element(dynamic_array *da, unsigned int index)
59 {
60 	if (index >= da->current) {
61 		return NULL;
62 	}
63 	return (void *)(da->array+index*da->element_size);
64 }
65 
66 /*
67  * Local variables:
68  * tab-width: 4
69  * c-basic-offset: 4
70  * indent-tabs-mode: t
71  * End:
72  */
73