Add doubly-linked list library
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George Oikonomou
parent
b82ca1a5ef
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/*
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* Copyright (c) 2017, George Oikonomou - http://www.spd.gr
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* Copyright (c) 2017, James Pope
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \addtogroup doubly-linked-list
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* @{
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*
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* \file
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* Implementation of doubly-linked lists
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*/
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/*---------------------------------------------------------------------------*/
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#include "contiki.h"
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#include "lib/dbl-list.h"
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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/*---------------------------------------------------------------------------*/
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struct dll {
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struct dll *next;
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struct dll *previous;
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};
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/*---------------------------------------------------------------------------*/
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void
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dbl_list_init(dbl_list_t dll)
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{
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*dll = NULL;
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}
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/*---------------------------------------------------------------------------*/
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void *
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dbl_list_head(dbl_list_t dll)
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{
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return *dll;
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}
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/*---------------------------------------------------------------------------*/
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void *
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dbl_list_tail(dbl_list_t dll)
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{
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struct dll *this;
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if(*dll == NULL) {
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return NULL;
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}
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for(this = *dll; this->next != NULL; this = this->next);
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return this;
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}
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/*---------------------------------------------------------------------------*/
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void
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dbl_list_remove(dbl_list_t dll, void *element)
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{
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struct dll *this, *previous, *next;
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if(*dll == NULL || element == NULL) {
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return;
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}
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for(this = *dll; this != NULL; this = this->next) {
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if(this == element) {
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previous = this->previous;
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next = this->next;
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if(previous) {
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previous->next = this->next;
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}
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if(next) {
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next->previous = this->previous;
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}
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if(*dll == this) {
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*dll = next;
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}
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return;
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}
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}
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}
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/*---------------------------------------------------------------------------*/
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void
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dbl_list_add_head(dbl_list_t dll, void *element)
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{
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struct dll *head;
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if(element == NULL) {
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return;
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}
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/* Don't add twice */
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dbl_list_remove(dll, element);
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head = dbl_list_head(dll);
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((struct dll *)element)->previous = NULL;
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((struct dll *)element)->next = head;
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if(head) {
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/* If the list was not empty, update ->previous on the old head */
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head->previous = element;
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}
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*dll = element;
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}
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/*---------------------------------------------------------------------------*/
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void
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dbl_list_add_tail(dbl_list_t dll, void *element)
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{
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struct dll *tail;
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if(element == NULL) {
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return;
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}
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/* Don't add twice */
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dbl_list_remove(dll, element);
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tail = dbl_list_tail(dll);
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if(tail == NULL) {
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/* The list was empty */
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*dll = element;
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} else {
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tail->next = element;
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}
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((struct dll *)element)->previous = tail;
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((struct dll *)element)->next = NULL;
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}
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/*---------------------------------------------------------------------------*/
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void
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dbl_list_add_after(dbl_list_t dll, void *existing, void *element)
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{
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if(element == NULL || existing == NULL) {
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return;
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}
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/* Don't add twice */
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dbl_list_remove(dll, element);
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((struct dll *)element)->next = ((struct dll *)existing)->next;
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((struct dll *)element)->previous = existing;
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if(((struct dll *)existing)->next) {
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((struct dll *)existing)->next->previous = element;
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}
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((struct dll *)existing)->next = element;
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}
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/*---------------------------------------------------------------------------*/
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void
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dbl_list_add_before(dbl_list_t dll, void *existing, void *element)
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{
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if(element == NULL || existing == NULL) {
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return;
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}
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/* Don't add twice */
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dbl_list_remove(dll, element);
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((struct dll *)element)->next = existing;
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((struct dll *)element)->previous = ((struct dll *)existing)->previous;
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if(((struct dll *)existing)->previous) {
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((struct dll *)existing)->previous->next = element;
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}
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((struct dll *)existing)->previous = element;
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/* If we added before the list's head, we must update the head */
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if(*dll == existing) {
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*dll = element;
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}
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}
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/*---------------------------------------------------------------------------*/
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unsigned long
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dbl_list_length(dbl_list_t dll)
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{
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unsigned long len = 0;
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struct dll *this;
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if(*dll == NULL) {
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return 0;
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}
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for(this = *dll; this != NULL; this = this->next) {
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len++;
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}
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return len;
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}
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/*---------------------------------------------------------------------------*/
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bool
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dbl_list_is_empty(dbl_list_t dll)
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{
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return *dll == NULL ? true : false;
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}
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/*---------------------------------------------------------------------------*/
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/** @} */
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@ -0,0 +1,191 @@
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/*
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* Copyright (c) 2017, George Oikonomou - http://www.spd.gr
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* Copyright (c) 2017, James Pope
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*---------------------------------------------------------------------------*/
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/** \addtogroup data
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* @{
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*
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* \defgroup doubly-linked-list Doubly-linked list
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*
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* This library provides functions for the creation and manipulation of
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* doubly-linked lists.
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*
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* A doubly-linked list is declared using the DBL_LIST macro.
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* Elements must be allocated by the calling code and must be of a C struct
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* datatype. In this struct, the first field must be a pointer called \e next.
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* The second field must be a pointer called \e previous.
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* These fields will be used by the library to maintain the list. Application
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* code must not modify these fields directly.
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*
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* Functions that modify the list (add / remove) will, in the general case,
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* update the list's head and item order. If you call one of these functions
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* as part of a list traversal, it is advised to stop / restart traversing
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* after the respective function returns.
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* @{
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*/
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/*---------------------------------------------------------------------------*/
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#ifndef DBL_LIST_H_
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#define DBL_LIST_H_
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/*---------------------------------------------------------------------------*/
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#include "contiki.h"
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Define a doubly-linked list.
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*
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* This macro defines a doubly-linked list.
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*
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* The datatype for elements must be a C struct.
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* The struct's first member must be a pointer called \e next.
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* The second field must be a pointer called \e previous.
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* These fields will be used by the library to maintain the list. Application
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* code must not modify these fields directly.
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*
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* \param name The name of the doubly-linked list.
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*/
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#define DBL_LIST(name) \
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static void *name##_dbl_list = NULL; \
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static dbl_list_t name = (dbl_list_t)&name##_dbl_list
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/*---------------------------------------------------------------------------*/
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/**
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* \brief The doubly-linked list datatype
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*/
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typedef void **dbl_list_t;
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Initialise a doubly-linked list.
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* \param dll The doubly-linked list.
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*/
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void dbl_list_init(dbl_list_t dll);
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/**
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* \brief Return the tail of a doubly-linked list.
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* \param dll The doubly-linked list.
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* \return A pointer to the list's head, or NULL if the list is empty
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*/
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void *dbl_list_head(dbl_list_t dll);
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/**
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* \brief Return the tail of a doubly-linked list.
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* \param dll The doubly-linked list.
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* \return A pointer to the list's tail, or NULL if the list is empty
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*/
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void *dbl_list_tail(dbl_list_t dll);
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/**
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* \brief Add an element to the head of a doubly-linked list.
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* \param dll The doubly-linked list.
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* \param element A pointer to the element to be added.
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*
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* Calling this function will update the list's head and item order. If you
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* call this function as part of a list traversal, it is advised to stop
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* traversing after this function returns.
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*/
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void dbl_list_add_head(dbl_list_t dll, void *element);
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/**
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* \brief Add an element to the tail of a doubly-linked list.
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* \param dll The doubly-linked list.
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* \param element A pointer to the element to be added.
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*
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* Calling this function will update the list's head and item order. If you
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* call this function as part of a list traversal, it is advised to stop
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* traversing after this function returns.
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*/
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void dbl_list_add_tail(dbl_list_t dll, void *element);
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/**
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* \brief Add an element to a doubly linked list after an existing element.
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* \param dll The doubly-linked list.
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* \param existing A pointer to the existing element.
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* \param element A pointer to the element to be added.
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*
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* This function will add \e element after \e existing
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*
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* The function will not verify that \e existing is already part of the list.
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*
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* Calling this function will update the list's head and item order. If you
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* call this function as part of a list traversal, it is advised to stop
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* traversing after this function returns.
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*/
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void dbl_list_add_after(dbl_list_t dll, void *existing, void *element);
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/**
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* \brief Add an element to a doubly linked list before an existing element.
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* \param dll The doubly-linked list.
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* \param existing A pointer to the existing element.
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* \param element A pointer to the element to be added.
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*
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* This function will add \e element before \e existing
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*
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* The function will not verify that \e existing is already part of the list.
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*
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* Calling this function will update the list's head and item order. If you
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* call this function as part of a list traversal, it is advised to stop
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* traversing after this function returns.
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*/
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void dbl_list_add_before(dbl_list_t dll, void *existing, void *element);
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/**
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* \brief Remove an element from a doubly-linked list.
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* \param dll The doubly-linked list.
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* \param element A pointer to the element to be removed.
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*
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* Calling this function will update the list's head and item order. If you
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* call this function as part of a list traversal, it is advised to stop
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* traversing after this function returns.
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*/
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void dbl_list_remove(dbl_list_t dll, void *element);
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/**
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* \brief Get the length of a doubly-linked list.
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* \param dll The doubly-linked list.
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* \return The number of elements in the list
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*/
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unsigned long dbl_list_length(dbl_list_t dll);
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/**
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* \brief Determine whether a doubly-linked list is empty.
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* \param dll The doubly-linked list.
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* \retval true The list is empty
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* \retval false The list is not empty
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*/
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bool dbl_list_is_empty(dbl_list_t dll);
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/*---------------------------------------------------------------------------*/
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#endif /* DBL_LIST_H_ */
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/*---------------------------------------------------------------------------*/
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/**
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* @}
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* @}
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*/
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