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/*
* Ouroboros - Copyright (C) 2016 - 2021
*
* Simple doubly linked list implementation.
*
* Dimitri Staessens <dimitri.staessens@ugent.be>
* Sander Vrijders <sander.vrijders@ugent.be>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., http://www.fsf.org/about/contact/.
*/
#include <ouroboros/list.h>
#include <stddef.h>
void list_head_init(struct list_head * h)
{
h->nxt = h;
h->prv = h;
}
static void add_list(struct list_head * n,
struct list_head * prv,
struct list_head * nxt)
{
nxt->prv = n;
n->nxt = nxt;
n->prv = prv;
prv->nxt = n;
}
static void del_list(struct list_head * prv,
struct list_head * nxt)
{
nxt->prv = prv;
prv->nxt = nxt;
}
void list_add(struct list_head * n,
struct list_head * h)
{
add_list(n, h, h->nxt);
}
void list_add_tail(struct list_head * n,
struct list_head * h)
{
add_list(n, h->prv, h);
}
void list_del(struct list_head * e)
{
del_list(e->prv, e->nxt);
e->nxt = e->prv = NULL;
}
bool list_is_empty(struct list_head * h)
{
return h->nxt == h;
}
void list_move(struct list_head * n,
struct list_head * h)
{
del_list(n->prv, n->nxt);
add_list(n, h, h->nxt);
}
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