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99 lines
2.2 KiB
C
99 lines
2.2 KiB
C
/*
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* SPDX-FileCopyrightText: 2016 Kaspar Schleiser <kaspar@schleiser.de>
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* SPDX-FileCopyrightText: 2016 TriaGnoSys GmbH
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* SPDX-License-Identifier: LGPL-2.1-only
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*/
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#pragma once
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/**
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* @ingroup core_util
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* @{
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*
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* @file
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* @brief Intrusive linked list
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*
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* Lists are represented as element pointing to the first actual list element.
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*
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* @author Kaspar Schleiser <kaspar@schleiser.de>
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* @author Víctor Ariño <victor.arino@zii.aero>
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief List node structure
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*
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* Used as is as reference to a list, or as member of any data structure that
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* should be member of a list.
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*
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* Actual list objects should have a @c list_node_t as member and then use
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* the container_of() macro in list operations.
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* See @ref thread_add_to_list() as example.
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*/
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typedef struct list_node {
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struct list_node *next; /**< pointer to next list entry */
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} list_node_t;
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/**
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* @brief Insert object into list
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*
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* If called with a list reference as node, the new node will become the new
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* list head.
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*
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* @param[in] node list node before new entry
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* @param[in] new_node list node to insert
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*/
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static inline void list_add(list_node_t *node, list_node_t *new_node)
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{
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new_node->next = node->next;
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node->next = new_node;
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}
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/**
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* @brief Removes the head of the list and returns it
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*
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* @param[in] list Pointer to the list itself, where list->next points
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* to the root node
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*
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* @return removed old list head, or NULL if empty
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*/
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static inline list_node_t *list_remove_head(list_node_t *list)
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{
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list_node_t *head = list->next;
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if (head) {
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list->next = head->next;
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}
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return head;
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}
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/**
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* @brief Removes the node from the list
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*
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* @param[in] list Pointer to the list itself, where list->next points
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* to the root node
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* @param[in] node List node to remove from the list
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*
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* @return removed node, or NULL if empty or not found
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*/
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static inline list_node_t *list_remove(list_node_t *list, list_node_t *node)
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{
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while (list->next) {
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if (list->next == node) {
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list->next = node->next;
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return node;
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}
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list = list->next;
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}
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return list->next;
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}
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#ifdef __cplusplus
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}
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#endif
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/** @} */
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