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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2017 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"
#define ZEND_STACK_ELEMENT(stack, n) ((void *)((char *) (stack)->elements + (stack)->size * (n)))
ZEND_API int zend_stack_init(zend_stack *stack, int size)
{
stack->size = size;
stack->top = 0;
stack->max = 0;
stack->elements = NULL;
return SUCCESS;
}
ZEND_API int zend_stack_push(zend_stack *stack, const void *element)
{
/* We need to allocate more memory */
if (stack->top >= stack->max) {
stack->max += STACK_BLOCK_SIZE;
stack->elements = safe_erealloc(stack->elements, stack->size, stack->max, 0);
}
memcpy(ZEND_STACK_ELEMENT(stack, stack->top), element, stack->size);
return stack->top++;
}
ZEND_API void *zend_stack_top(const zend_stack *stack)
{
if (stack->top > 0) {
return ZEND_STACK_ELEMENT(stack, stack->top - 1);
} else {
return NULL;
}
}
ZEND_API int zend_stack_del_top(zend_stack *stack)
{
--stack->top;
return SUCCESS;
}
ZEND_API int zend_stack_int_top(const zend_stack *stack)
{
int *e = zend_stack_top(stack);
if (e) {
return *e;
} else {
return FAILURE;
}
}
ZEND_API int zend_stack_is_empty(const zend_stack *stack)
{
return stack->top == 0;
}
ZEND_API int zend_stack_destroy(zend_stack *stack)
{
if (stack->elements) {
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(ZEND_STACK_ELEMENT(stack, i))) {
break;
}
}
break;
case ZEND_STACK_APPLY_BOTTOMUP:
for (i=0; i<stack->top; i++) {
if (apply_function(ZEND_STACK_ELEMENT(stack, 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(ZEND_STACK_ELEMENT(stack, i), arg)) {
break;
}
}
break;
case ZEND_STACK_APPLY_BOTTOMUP:
for (i=0; i<stack->top; i++) {
if (apply_function(ZEND_STACK_ELEMENT(stack, i), arg)) {
break;
}
}
break;
}
}
ZEND_API void zend_stack_clean(zend_stack *stack, void (*func)(void *), zend_bool free_elements)
{
int i;
if (func) {
for (i = 0; i < stack->top; i++) {
func(ZEND_STACK_ELEMENT(stack, i));
}
}
if (free_elements) {
if (stack->elements) {
efree(stack->elements);
stack->elements = NULL;
}
stack->top = stack->max = 0;
}
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*/