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https://github.com/freebsd/freebsd-src
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115 lines
3.2 KiB
C
115 lines
3.2 KiB
C
/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Ed James.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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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/*
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* Copyright (c) 1987 by Ed James, UC Berkeley. All rights reserved.
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*
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* Copy permission is hereby granted provided that this notice is
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* retained on all partial or complete copies.
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*
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* For more info on this and all of my stuff, mail edjames@berkeley.edu.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)list.c 8.1 (Berkeley) 5/31/93";
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#endif /* not lint */
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#include "include.h"
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PLANE *
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newplane()
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{
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return ((PLANE *) calloc(1, sizeof (PLANE)));
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}
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append(l, p)
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LIST *l;
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PLANE *p;
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{
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PLANE *q = NULL, *r = NULL;
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if (l->head == NULL) {
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p->next = p->prev = NULL;
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l->head = l->tail = p;
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} else {
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q = l -> head;
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while (q != NULL && q->plane_no < p->plane_no) {
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r = q;
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q = q -> next;
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}
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if (q) {
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if (r) {
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p->prev = r;
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r->next = p;
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p->next = q;
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q->prev = p;
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} else {
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p->next = q;
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p->prev = NULL;
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q->prev = p;
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l->head = p;
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}
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} else {
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l->tail->next = p;
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p->next = NULL;
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p->prev = l->tail;
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l->tail = p;
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}
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}
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}
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delete(l, p)
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LIST *l;
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PLANE *p;
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{
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if (l->head == NULL)
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loser(p, "deleted a non-existant plane! Get help!");
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if (l->head == p && l->tail == p)
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l->head = l->tail = NULL;
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else if (l->head == p) {
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l->head = p->next;
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l->head->prev = NULL;
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} else if (l->tail == p) {
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l->tail = p->prev;
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l->tail->next = NULL;
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} else {
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p->prev->next = p->next;
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p->next->prev = p->prev;
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}
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}
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