2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#)list.c 8.1 (Berkeley) 5/31/93
37 * $FreeBSD: src/games/atc/list.c,v 1.4 1999/11/30 03:48:20 billf Exp $
38 * $DragonFly: src/games/atc/list.c,v 1.3 2006/08/08 15:03:02 pavalos Exp $
42 * Copyright (c) 1987 by Ed James, UC Berkeley. All rights reserved.
44 * Copy permission is hereby granted provided that this notice is
45 * retained on all partial or complete copies.
47 * For more info on this and all of my stuff, mail edjames@berkeley.edu.
56 return ((PLANE *) calloc(1, sizeof (PLANE)));
60 append(LIST *l, PLANE *p)
62 PLANE *q = NULL, *r = NULL;
64 if (l->head == NULL) {
65 p->next = p->prev = NULL;
66 l->head = l->tail = p;
70 while (q != NULL && q->plane_no < p->plane_no) {
97 delete(LIST *l, PLANE *p)
100 loser(p, "deleted a non-existant plane! Get help!");
102 if (l->head == p && l->tail == p)
103 l->head = l->tail = NULL;
104 else if (l->head == p) {
106 l->head->prev = NULL;
107 } else if (l->tail == p) {
109 l->tail->next = NULL;
111 p->prev->next = p->next;
112 p->next->prev = p->prev;