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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998, 1999 Andi Gutmans, Zeev Suraski |
+----------------------------------------------------------------------+
| This source file is subject to the Zend license, that is bundled |
| with this package in the file LICENSE. If you did not receive a |
| copy of the Zend license, please mail us at zend@zend.com so we can |
| send you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <andi@zend.com> |
| Zeev Suraski <zeev@zend.com> |
+----------------------------------------------------------------------+
*/

#include "zend.h"
#include "zend_ptr_stack.h"


ZEND_API void zend_ptr_stack_init(zend_ptr_stack *stack)
{
stack->top_element = stack->elements = (void **) emalloc(sizeof(void *)*STACK_BLOCK_SIZE);
stack->max = STACK_BLOCK_SIZE;
stack->top = 0;
}


ZEND_API inline void zend_ptr_stack_push(zend_ptr_stack *stack, void *ptr)
{
if (stack->top >= stack->max) { /* we need to allocate more memory */
short diff = stack->top_element-stack->elements;

stack->elements = (void **) erealloc(stack->elements, (sizeof(void *) * (stack->max *= 2 )));
stack->top_element = stack->elements+diff;
}
stack->top++;
*(stack->top_element++) = ptr;
}


ZEND_API inline void *zend_ptr_stack_pop(zend_ptr_stack *stack)
{
stack->top--;
return *(--stack->top_element);
}


ZEND_API void zend_ptr_stack_destroy(zend_ptr_stack *stack)
{
if (stack->elements) {
efree(stack->elements);
}
}


ZEND_API void zend_ptr_stack_apply(zend_ptr_stack *stack, void (*func)(void *))
{
int i = stack->top;

while (--i >= 0) {
func(stack->elements[i]);
}
}


ZEND_API void zend_ptr_stack_clean(zend_ptr_stack *stack, void (*func)(void *))
{
zend_ptr_stack_apply(stack, func);
stack->top = 0;
stack->top_element = stack->elements;
}


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