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/**************************************************************************//**
* @file
* A simple double-linked list.
*
* @note No thread protection so you will need to use appropriate
* synchronization if use spans multiple threads.
*
* License
* -------
*
* Copyright(c) <2016>, AT&T Intellectual Property. All other rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement: This product includes
* software developed by the AT&T.
* 4. Neither the name of AT&T nor the names of its contributors may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY AT&T INTELLECTUAL PROPERTY ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL AT&T INTELLECTUAL PROPERTY BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/
#include <assert.h>
#include <malloc.h>
#include "double_list.h"
#include "evel.h"
/**************************************************************************//**
* List initialization.
*
* Initialize the list supplied to be empty.
*
* @param list Pointer to the list to be initialized.
* @returns Nothing
******************************************************************************/
void dlist_initialize(DLIST * list)
{
EVEL_ENTER();
/***************************************************************************/
/* Check assumptions. */
/***************************************************************************/
assert(list != NULL);
/***************************************************************************/
/* Initialize the list as empty. */
/***************************************************************************/
list->head = NULL;
list->tail = NULL;
EVEL_EXIT();
}
void * dlist_pop_last(DLIST * list)
{
void *item = NULL;
DLIST_ITEM *current_tail = NULL;
DLIST_ITEM *new_tail = NULL;
assert(list != NULL);
current_tail = list->tail;
if (current_tail != NULL)
{
item = current_tail->item;
new_tail = current_tail->previous;
if (new_tail == NULL)
{
list->head = NULL;
list->tail = NULL;
}
else
{
new_tail->next = NULL;
list->tail = new_tail;
}
free(current_tail);
}
return item;
}
void dlist_push_first(DLIST * list, void * item)
{
DLIST_ITEM * new_element = NULL;
DLIST_ITEM * current_head = NULL;
/***************************************************************************/
/* Check assumptions. Note that we do allow putting NULL pointers into */
/* the list - not sure you'd want to, but let it happen. */
/***************************************************************************/
assert(list != NULL);
current_head = list->head;
new_element = malloc(sizeof(DLIST_ITEM));
assert(new_element != NULL);
new_element->next = current_head;
new_element->previous = NULL;
new_element->item = item;
list->head = new_element;
if (current_head != NULL)
{
current_head->previous = new_element;
}
else
{
list->tail = new_element;
}
}
void dlist_push_last(DLIST * list, void * item)
{
DLIST_ITEM * new_element = NULL;
DLIST_ITEM * current_tail = NULL;
/***************************************************************************/
/* Check assumptions. Note that we do allow putting NULL pointers into */
/* the list - not sure you'd want to, but let it happen. */
/***************************************************************************/
assert(list != NULL);
current_tail = list->tail;
new_element = malloc(sizeof(DLIST_ITEM));
assert(new_element != NULL);
new_element->next = NULL;
new_element->previous = current_tail;
new_element->item = item;
list->tail = new_element;
if (current_tail != NULL)
{
current_tail->next = new_element;
}
else
{
list->head = new_element;
}
}
DLIST_ITEM * dlist_get_first(DLIST * list)
{
return list->head;
}
DLIST_ITEM * dlist_get_last(DLIST * list)
{
return list->tail;
}
DLIST_ITEM * dlist_get_next(DLIST_ITEM * item)
{
return item->next;
}
int dlist_is_empty(DLIST * list)
{
return (list->head == NULL);
}
int dlist_count(DLIST * list)
{
int count = 0;
DLIST_ITEM * item = list->head;
while (item != NULL)
{
count++;
item = item->next;
}
return count;
}
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