zend_ptr_stack.c

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/*
   +----------------------------------------------------------------------+
   | Zend Engine                                                          |
   +----------------------------------------------------------------------+
   | Copyright (c) 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@php.net>                                 |
   |          Zeev Suraski <zeev@php.net>                                 |
   +----------------------------------------------------------------------+
*/
 
#include "zend.h"
#include "zend_ptr_stack.h"
#include <stdarg.h>
 
ZEND_API void zend_ptr_stack_init_ex(zend_ptr_stack *stack, bool persistent)
{
    stack->top_element = stack->elements = NULL;
    stack->top = stack->max = 0;
    stack->persistent = persistent;
}
 
ZEND_API void zend_ptr_stack_init(zend_ptr_stack *stack)
{
    zend_ptr_stack_init_ex(stack, 0);
}
 
 
ZEND_API void zend_ptr_stack_n_push(zend_ptr_stack *stack, int count, ...)
{
    va_list ptr;
    void *elem;
 
    ZEND_PTR_STACK_RESIZE_IF_NEEDED(stack, count)
 
    va_start(ptr, count);
    while (count>0) {
        elem = va_arg(ptr, void *);
        stack->top++;
        *(stack->top_element++) = elem;
        count--;
    }
    va_end(ptr);
}
 
 
ZEND_API void zend_ptr_stack_n_pop(zend_ptr_stack *stack, int count, ...)
{
    va_list ptr;
    void **elem;
 
    va_start(ptr, count);
    while (count>0) {
        elem = va_arg(ptr, void **);
        *elem = *(--stack->top_element);
        stack->top--;
        count--;
    }
    va_end(ptr);
}
 
 
 
ZEND_API void zend_ptr_stack_destroy(zend_ptr_stack *stack)
{
    if (stack->elements) {
        pefree(stack->elements, stack->persistent);
    }
}
 
 
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_reverse_apply(zend_ptr_stack *stack, void (*func)(void *))
{
    int i = 0;
 
    while (i < stack->top) {
        func(stack->elements[i++]);
    }
}
 
 
ZEND_API void zend_ptr_stack_clean(zend_ptr_stack *stack, void (*func)(void *), bool free_elements)
{
    zend_ptr_stack_apply(stack, func);
    if (free_elements) {
        int i = stack->top;
 
        while (--i >= 0) {
            pefree(stack->elements[i], stack->persistent);
        }
    }
    stack->top = 0;
    stack->top_element = stack->elements;
}
 
 
ZEND_API int zend_ptr_stack_num_elements(zend_ptr_stack *stack)
{
    return stack->top;
}