158 lines
5.3 KiB
C
158 lines
5.3 KiB
C
/*
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* Copyright (c) 2004, Swedish Institute of Computer Science.
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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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* 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 Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR 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, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* Author: Adam Dunkels <adam@sics.se>
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*
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*/
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/**
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* \file
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* Linked list manipulation routines.
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* \author Adam Dunkels <adam@sics.se>
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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 list Linked list library
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*
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* The linked list library provides a set of functions for
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* manipulating linked lists.
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*
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* A linked list is made up of elements where the first element \b
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* must be a pointer. This pointer is used by the linked list library
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* to form lists of the elements.
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*
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* Lists are declared with the LIST() macro. The declaration specifies
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* the name of the list that later is used with all list functions.
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*
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* Lists can be manipulated by inserting or removing elements from
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* either sides of the list (list_push(), list_add(), list_pop(),
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* list_chop()). A specified element can also be removed from inside a
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* list with list_remove(). The head and tail of a list can be
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* extracted using list_head() and list_tail(), respectively.
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*
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* @{
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*/
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#ifndef LIST_H_
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#define LIST_H_
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#define LIST_CONCAT2(s1, s2) s1##s2
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#define LIST_CONCAT(s1, s2) LIST_CONCAT2(s1, s2)
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/**
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* Declare a linked list.
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*
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* This macro declares a linked list with the specified \c type. The
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* type \b must be a structure (\c struct) with its first element
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* being a pointer. This pointer is used by the linked list library to
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* form the linked lists.
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*
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* The list variable is declared as static to make it easy to use in a
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* single C module without unnecessarily exporting the name to other
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* modules.
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*
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* \param name The name of the list.
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*/
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#define LIST(name) \
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static void *LIST_CONCAT(name,_list) = NULL; \
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static list_t name = (list_t)&LIST_CONCAT(name,_list)
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/**
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* Declare a linked list inside a structure declaraction.
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*
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* This macro declares a linked list with the specified \c type. The
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* type \b must be a structure (\c struct) with its first element
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* being a pointer. This pointer is used by the linked list library to
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* form the linked lists.
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*
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* Internally, the list is defined as two items: the list itself and a
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* pointer to the list. The pointer has the name of the parameter to
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* the macro and the name of the list is a concatenation of the name
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* and the suffix "_list". The pointer must point to the list for the
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* list to work. Thus the list must be initialized before using.
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*
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* The list is initialized with the LIST_STRUCT_INIT() macro.
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*
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* \param name The name of the list.
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*/
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#define LIST_STRUCT(name) \
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void *LIST_CONCAT(name,_list); \
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list_t name
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/**
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* Initialize a linked list that is part of a structure.
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*
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* This macro sets up the internal pointers in a list that has been
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* defined as part of a struct. This macro must be called before using
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* the list.
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*
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* \param struct_ptr A pointer to the struct
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* \param name The name of the list.
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*/
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#define LIST_STRUCT_INIT(struct_ptr, name) \
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do { \
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(struct_ptr)->name = &((struct_ptr)->LIST_CONCAT(name,_list)); \
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(struct_ptr)->LIST_CONCAT(name,_list) = NULL; \
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list_init((struct_ptr)->name); \
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} while(0)
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/**
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* The linked list type.
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*
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*/
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typedef void ** list_t;
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void list_init(list_t list);
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void * list_head(list_t list);
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void * list_tail(list_t list);
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void * list_pop (list_t list);
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void list_push(list_t list, void *item);
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void * list_chop(list_t list);
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void list_add(list_t list, void *item);
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void list_remove(list_t list, void *item);
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int list_length(list_t list);
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void list_copy(list_t dest, list_t src);
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void list_insert(list_t list, void *previtem, void *newitem);
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void * list_item_next(void *item);
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#endif /* LIST_H_ */
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/** @} */
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/** @} */
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