root/Zend/zend_stack.c

DEFINITIONS

1. zend_stack_init
2. zend_stack_push
3. zend_stack_top
4. zend_stack_del_top
5. zend_stack_int_top
6. zend_stack_is_empty
7. zend_stack_destroy
8. zend_stack_base
9. zend_stack_count
10. zend_stack_apply
11. zend_stack_apply_with_argument

   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 #include "zend_stack.h"
  24 
  25 ZEND_API int zend_stack_init(zend_stack *stack)
  26 {
  27         stack->top = 0;
  28         stack->max = 0;
  29         stack->elements = NULL;
  30         return SUCCESS;
  31 }
  32 
  33 ZEND_API int zend_stack_push(zend_stack *stack, const void *element, int size)
  34 {
  35         if (stack->top >= stack->max) {         /* we need to allocate more memory */
  36                 stack->elements = (void **) erealloc(stack->elements,
  37                                    (sizeof(void **) * (stack->max += STACK_BLOCK_SIZE)));
  38                 if (!stack->elements) {
  39                         return FAILURE;
  40                 }
  41         }
  42         stack->elements[stack->top] = (void *) emalloc(size);
  43         memcpy(stack->elements[stack->top], element, size);
  44         return stack->top++;
  45 }
  46 
  47 
  48 ZEND_API int zend_stack_top(const zend_stack *stack, void **element)
  49 {
  50         if (stack->top > 0) {
  51                 *element = stack->elements[stack->top - 1];
  52                 return SUCCESS;
  53         } else {
  54                 *element = NULL;
  55                 return FAILURE;
  56         }
  57 }
  58 
  59 
  60 ZEND_API int zend_stack_del_top(zend_stack *stack)
  61 {
  62         if (stack->top > 0) {
  63                 efree(stack->elements[--stack->top]);
  64         }
  65         return SUCCESS;
  66 }
  67 
  68 
  69 ZEND_API int zend_stack_int_top(const zend_stack *stack)
  70 {
  71         int *e;
  72 
  73         if (zend_stack_top(stack, (void **) &e) == FAILURE) {
  74                 return FAILURE;                 /* this must be a negative number, since negative numbers can't be address numbers */
  75         } else {
  76                 return *e;
  77         }
  78 }
  79 
  80 
  81 ZEND_API int zend_stack_is_empty(const zend_stack *stack)
  82 {
  83         if (stack->top == 0) {
  84                 return 1;
  85         } else {
  86                 return 0;
  87         }
  88 }
  89 
  90 
  91 ZEND_API int zend_stack_destroy(zend_stack *stack)
  92 {
  93         int i;
  94 
  95         if (stack->elements) {
  96                 for (i = 0; i < stack->top; i++) {
  97                         efree(stack->elements[i]);
  98                 }
  99                 efree(stack->elements);
 100                 stack->elements = NULL;
 101         }
 102 
 103         return SUCCESS;
 104 }
 105 
 106 
 107 ZEND_API void **zend_stack_base(const zend_stack *stack)
 108 {
 109         return stack->elements;
 110 }
 111 
 112 
 113 ZEND_API int zend_stack_count(const zend_stack *stack)
 114 {
 115         return stack->top;
 116 }
 117 
 118 
 119 ZEND_API void zend_stack_apply(zend_stack *stack, int type, int (*apply_function)(void *element))
 120 {
 121         int i;
 122 
 123         switch (type) {
 124                 case ZEND_STACK_APPLY_TOPDOWN:
 125                         for (i=stack->top-1; i>=0; i--) {
 126                                 if (apply_function(stack->elements[i])) {
 127                                         break;
 128                                 }
 129                         }
 130                         break;
 131                 case ZEND_STACK_APPLY_BOTTOMUP:
 132                         for (i=0; i<stack->top; i++) {
 133                                 if (apply_function(stack->elements[i])) {
 134                                         break;
 135                                 }
 136                         }
 137                         break;
 138         }
 139 }
 140 
 141 
 142 ZEND_API void zend_stack_apply_with_argument(zend_stack *stack, int type, int (*apply_function)(void *element, void *arg), void *arg)
 143 {
 144         int i;
 145 
 146         switch (type) {
 147                 case ZEND_STACK_APPLY_TOPDOWN:
 148                         for (i=stack->top-1; i>=0; i--) {
 149                                 if (apply_function(stack->elements[i], arg)) {
 150                                         break;
 151                                 }
 152                         }
 153                         break;
 154                 case ZEND_STACK_APPLY_BOTTOMUP:
 155                         for (i=0; i<stack->top; i++) {
 156                                 if (apply_function(stack->elements[i], arg)) {
 157                                         break;
 158                                 }
 159                         }
 160                         break;
 161         }
 162 }
 163 
 164 /*
 165  * Local variables:
 166  * tab-width: 4
 167  * c-basic-offset: 4
 168  * indent-tabs-mode: t
 169  * End:
 170  */