list.h

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/*
 * Copyright (C) 2001-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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.
 */

#ifndef __LIST_H__
#define __LIST_H__

#include<unistd.h>

#ifndef true
# define true 1
#endif
#ifndef false
# define false 0
#endif

typedef struct link link_t;

struct link {
        link_t *prev;   
        link_t *next;   
};

#define LIST_INITIALIZE(name)           link_t name = { .prev = &name, .next = &name }

static inline void link_initialize(link_t *link)
{
        link->prev = NULL;
        link->next = NULL;
}

static inline void list_initialize(link_t *head)
{
        head->prev = head;
        head->next = head;
}

static inline void list_prepend(link_t *link, link_t *head)
{
        link->next = head->next;
        link->prev = head;
        head->next->prev = link;
        head->next = link;
}

static inline void list_append(link_t *link, link_t *head)
{
        link->prev = head->prev;
        link->next = head;
        head->prev->next = link;
        head->prev = link;
}

static inline void list_remove(link_t *link)
{
        link->next->prev = link->prev;
        link->prev->next = link->next;
        link_initialize(link);
}

static inline int list_empty(link_t *head)
{
        return head->next == head ? true : false;
}


static inline void headless_list_split_or_concat(link_t *part1, link_t *part2)
{
        link_t *hlp;

        part1->prev->next = part2;
        part2->prev->next = part1;      
        hlp = part1->prev;
        part1->prev = part2->prev;
        part2->prev = hlp;
}


static inline void headless_list_split(link_t *part1, link_t *part2)
{
        headless_list_split_or_concat(part1, part2);
}

static inline void headless_list_concat(link_t *part1, link_t *part2)
{
        headless_list_split_or_concat(part1, part2);
}

#define list_get_instance(link,type,member) (type *)(((char *)(link))-((char *)&(((type *)NULL)->member)))

extern int list_member(const link_t *link, const link_t *head);
extern void list_concat(link_t *head1, link_t *head2);

#endif

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