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

/*
   +----------------------------------------------------------------------+
   | Zend Engine                                                          |
   +----------------------------------------------------------------------+
   | Copyright (c) 1998-2015 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:
 */