1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
|
/* $OpenBSD: list.c,v 1.3 1999/07/31 20:08:30 pjanzen Exp $ */
/* $NetBSD: list.c,v 1.3 1995/03/21 15:04:18 cgd Exp $ */
/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ed James.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*/
/*
* Copyright (c) 1987 by Ed James, UC Berkeley. All rights reserved.
*
* Copy permission is hereby granted provided that this notice is
* retained on all partial or complete copies.
*
* For more info on this and all of my stuff, mail edjames@berkeley.edu.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)list.c 8.1 (Berkeley) 5/31/93";
#else
static char rcsid[] = "$OpenBSD: list.c,v 1.3 1999/07/31 20:08:30 pjanzen Exp $";
#endif
#endif /* not lint */
#include "include.h"
PLANE *
newplane()
{
PLANE *p;
if ((p = (PLANE *) calloc(1, sizeof (PLANE))) == NULL)
loser(NULL, "Out of memory");
return (p);
}
void
append(l, p)
LIST *l;
PLANE *p;
{
PLANE *q = NULL, *r = NULL;
if (l->head == NULL) {
p->next = p->prev = NULL;
l->head = l->tail = p;
} else {
q = l -> head;
while (q != NULL && q->plane_no < p->plane_no) {
r = q;
q = q -> next;
}
if (q) {
if (r) {
p->prev = r;
r->next = p;
p->next = q;
q->prev = p;
} else {
p->next = q;
p->prev = NULL;
q->prev = p;
l->head = p;
}
} else {
l->tail->next = p;
p->next = NULL;
p->prev = l->tail;
l->tail = p;
}
}
}
void
delete(l, p)
LIST *l;
PLANE *p;
{
if (l->head == NULL)
loser(p, "deleted a non-existant plane! Get help!");
if (l->head == p && l->tail == p)
l->head = l->tail = NULL;
else if (l->head == p) {
l->head = p->next;
l->head->prev = NULL;
} else if (l->tail == p) {
l->tail = p->prev;
l->tail->next = NULL;
} else {
p->prev->next = p->next;
p->next->prev = p->prev;
}
}
|
