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/*
* Copyright (C) 2014 BlueKitchen GmbH
*
* 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. Neither the name of the copyright holders nor the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
* 4. Any redistribution, use, or modification is done solely for
* personal benefit and not for any commercial purpose or for
* monetary gain.
*
* THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
* ``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 BLUEKITCHEN
* GMBH OR CONTRIBUTORS 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.
*
* Please inquire about commercial licensing options at
* contact@bluekitchen-gmbh.com
*
*/
#define BTSTACK_FILE__ "btstack_linked_list.c"
/*
* linked_list.c
*
* Created by Matthias Ringwald on 7/13/09.
*/
#include "btstack_linked_list.h"
#include "btstack_debug.h"
#include <stddef.h>
/**
* tests if list is empty
*/
bool btstack_linked_list_empty(btstack_linked_list_t * list){
return *list == (void *) 0;
}
/**
* btstack_linked_list_get_last_item
*/
btstack_linked_item_t * btstack_linked_list_get_last_item(btstack_linked_list_t * list){ // <-- find the last item in the list
btstack_linked_item_t *lastItem = NULL;
btstack_linked_item_t *it;
for (it = *list; it != NULL; it = it->next){
if (it != NULL) {
lastItem = it;
}
}
return lastItem;
}
/**
* btstack_linked_list_add
*/
bool btstack_linked_list_add(btstack_linked_list_t * list, btstack_linked_item_t *item){ // <-- add item to list
// check if already in list
btstack_linked_item_t *it;
for (it = *list; it != NULL; it = it->next){
if (it == item) {
return false;
}
}
// add first
item->next = *list;
*list = item;
return true;
}
bool btstack_linked_list_add_tail(btstack_linked_list_t * list, btstack_linked_item_t *item){ // <-- add item to list as last element
// check if already in list
btstack_linked_item_t *it;
for (it = (btstack_linked_item_t *) list; it->next != NULL ; it = it->next){
if (it->next == item) {
return false;
}
}
item->next = (btstack_linked_item_t*) 0;
it->next = item;
return true;
}
bool btstack_linked_list_remove(btstack_linked_list_t * list, btstack_linked_item_t *item){ // <-- remove item from list
if (!item) return false;
btstack_linked_item_t *it;
for (it = (btstack_linked_item_t *) list; it != NULL; it = it->next){
if (it->next == item){
it->next = item->next;
return true;
}
}
return false;
}
/**
* @return number of items in list
*/
int btstack_linked_list_count(btstack_linked_list_t * list){
btstack_linked_item_t *it;
int counter = 0;
for (it = (btstack_linked_item_t *) list; it->next != NULL; it = it->next) {
counter++;
}
return counter;
}
// get first element
btstack_linked_item_t * btstack_linked_list_get_first_item(btstack_linked_list_t * list){
return * list;
}
// pop (get + remove) first element
btstack_linked_item_t * btstack_linked_list_pop(btstack_linked_list_t * list){
btstack_linked_item_t * item = *list;
if (!item) return NULL;
*list = item->next;
return item;
}
//
// Linked List Iterator implementation
//
void btstack_linked_list_iterator_init(btstack_linked_list_iterator_t * it, btstack_linked_list_t * list){
it->advance_on_next = 0;
it->prev = (btstack_linked_item_t*) list;
it->curr = * list;
}
bool btstack_linked_list_iterator_has_next(btstack_linked_list_iterator_t * it){
// log_info("btstack_linked_list_iterator_has_next: advance on next %u, it->prev %p, it->curr %p", it->advance_on_next, it->prev, it->curr);
if (!it->advance_on_next){
return it->curr != NULL;
}
if (it->prev->next != it->curr){
// current item has been removed
return it->prev->next != NULL;
}
// current items has not been removed
return it->curr->next != NULL;
}
btstack_linked_item_t * btstack_linked_list_iterator_next(btstack_linked_list_iterator_t * it){
if (it->advance_on_next){
if (it->prev->next == it->curr){
it->prev = it->curr;
it->curr = it->curr->next;
} else {
// curr was removed from the list, set it again but don't advance prev
it->curr = it->prev->next;
}
} else {
it->advance_on_next = 1;
}
return it->curr;
}
void btstack_linked_list_iterator_remove(btstack_linked_list_iterator_t * it){
btstack_assert(it->prev->next == it->curr);
it->curr = it->curr->next;
it->prev->next = it->curr;
it->advance_on_next = 0;
}
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