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
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2016 Zend Technologies Ltd. (http://www.zend.com) |
+----------------------------------------------------------------------+
| This source file is subject to version 2.00 of the Zend license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.zend.com/license/2_00.txt. |
| If you did not receive a copy of the Zend license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@zend.com so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <andi@zend.com> |
| Zeev Suraski <zeev@zend.com> |
+----------------------------------------------------------------------+
*/
/* $Id$ */
#include "zend.h"
#include "zend_stack.h"
ZEND_API int zend_stack_init(zend_stack *stack)
{
stack->top = 0;
stack->max = 0;
stack->elements = NULL;
return SUCCESS;
}
ZEND_API int zend_stack_push(zend_stack *stack, const void *element, int size)
{
if (stack->top >= stack->max) { /* we need to allocate more memory */
stack->elements = (void **) erealloc(stack->elements,
(sizeof(void **) * (stack->max += STACK_BLOCK_SIZE)));
if (!stack->elements) {
return FAILURE;
}
}
stack->elements[stack->top] = (void *) emalloc(size);
memcpy(stack->elements[stack->top], element, size);
return stack->top++;
}
ZEND_API int zend_stack_top(const zend_stack *stack, void **element)
{
if (stack->top > 0) {
*element = stack->elements[stack->top - 1];
return SUCCESS;
} else {
*element = NULL;
return FAILURE;
}
}
ZEND_API int zend_stack_del_top(zend_stack *stack)
{
if (stack->top > 0) {
efree(stack->elements[--stack->top]);
}
return SUCCESS;
}
ZEND_API int zend_stack_int_top(const zend_stack *stack)
{
int *e;
if (zend_stack_top(stack, (void **) &e) == FAILURE) {
return FAILURE; /* this must be a negative number, since negative numbers can't be address numbers */
} else {
return *e;
}
}
ZEND_API int zend_stack_is_empty(const zend_stack *stack)
{
if (stack->top == 0) {
return 1;
} else {
return 0;
}
}
ZEND_API int zend_stack_destroy(zend_stack *stack)
{
int i;
if (stack->elements) {
for (i = 0; i < stack->top; i++) {
efree(stack->elements[i]);
}
efree(stack->elements);
stack->elements = NULL;
}
return SUCCESS;
}
ZEND_API void **zend_stack_base(const zend_stack *stack)
{
return stack->elements;
}
ZEND_API int zend_stack_count(const zend_stack *stack)
{
return stack->top;
}
ZEND_API void zend_stack_apply(zend_stack *stack, int type, int (*apply_function)(void *element))
{
int i;
switch (type) {
case ZEND_STACK_APPLY_TOPDOWN:
for (i=stack->top-1; i>=0; i--) {
if (apply_function(stack->elements[i])) {
break;
}
}
break;
case ZEND_STACK_APPLY_BOTTOMUP:
for (i=0; i<stack->top; i++) {
if (apply_function(stack->elements[i])) {
break;
}
}
break;
}
}
ZEND_API void zend_stack_apply_with_argument(zend_stack *stack, int type, int (*apply_function)(void *element, void *arg), void *arg)
{
int i;
switch (type) {
case ZEND_STACK_APPLY_TOPDOWN:
for (i=stack->top-1; i>=0; i--) {
if (apply_function(stack->elements[i], arg)) {
break;
}
}
break;
case ZEND_STACK_APPLY_BOTTOMUP:
for (i=0; i<stack->top; i++) {
if (apply_function(stack->elements[i], arg)) {
break;
}
}
break;
}
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*/
|
