summaryrefslogtreecommitdiff
path: root/source4/heimdal/lib/asn1/asn1_queue.h
blob: 3659b3859d0d0a77c60b79e37587140cfdf13f1b (plain)
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
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
/*	$NetBSD: queue.h,v 1.38 2004/04/18 14:12:05 lukem Exp $	*/
/*	$Id: asn1_queue.h 15617 2005-07-12 06:27:42Z lha $ */

/*
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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. 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.
 *
 *	@(#)queue.h	8.5 (Berkeley) 8/20/94
 */

#ifndef	_ASN1_QUEUE_H_
#define	_ASN1_QUEUE_H_

/*
 * Tail queue definitions.
 */
#define	ASN1_TAILQ_HEAD(name, type)					\
struct name {								\
	struct type *tqh_first;	/* first element */			\
	struct type **tqh_last;	/* addr of last next element */		\
}

#define	ASN1_TAILQ_HEAD_INITIALIZER(head)				\
	{ NULL, &(head).tqh_first }
#define	ASN1_TAILQ_ENTRY(type)						\
struct {								\
	struct type *tqe_next;	/* next element */			\
	struct type **tqe_prev;	/* address of previous next element */	\
}

/*
 * Tail queue functions.
 */
#if defined(_KERNEL) && defined(QUEUEDEBUG)
#define	QUEUEDEBUG_ASN1_TAILQ_INSERT_HEAD(head, elm, field)		\
	if ((head)->tqh_first &&					\
	    (head)->tqh_first->field.tqe_prev != &(head)->tqh_first)	\
		panic("ASN1_TAILQ_INSERT_HEAD %p %s:%d", (head), __FILE__, __LINE__);
#define	QUEUEDEBUG_ASN1_TAILQ_INSERT_TAIL(head, elm, field)		\
	if (*(head)->tqh_last != NULL)					\
		panic("ASN1_TAILQ_INSERT_TAIL %p %s:%d", (head), __FILE__, __LINE__);
#define	QUEUEDEBUG_ASN1_TAILQ_OP(elm, field)				\
	if ((elm)->field.tqe_next &&					\
	    (elm)->field.tqe_next->field.tqe_prev !=			\
	    &(elm)->field.tqe_next)					\
		panic("ASN1_TAILQ_* forw %p %s:%d", (elm), __FILE__, __LINE__);\
	if (*(elm)->field.tqe_prev != (elm))				\
		panic("ASN1_TAILQ_* back %p %s:%d", (elm), __FILE__, __LINE__);
#define	QUEUEDEBUG_ASN1_TAILQ_PREREMOVE(head, elm, field)		\
	if ((elm)->field.tqe_next == NULL &&				\
	    (head)->tqh_last != &(elm)->field.tqe_next)			\
		panic("ASN1_TAILQ_PREREMOVE head %p elm %p %s:%d",	\
		      (head), (elm), __FILE__, __LINE__);
#define	QUEUEDEBUG_ASN1_TAILQ_POSTREMOVE(elm, field)			\
	(elm)->field.tqe_next = (void *)1L;				\
	(elm)->field.tqe_prev = (void *)1L;
#else
#define	QUEUEDEBUG_ASN1_TAILQ_INSERT_HEAD(head, elm, field)
#define	QUEUEDEBUG_ASN1_TAILQ_INSERT_TAIL(head, elm, field)
#define	QUEUEDEBUG_ASN1_TAILQ_OP(elm, field)
#define	QUEUEDEBUG_ASN1_TAILQ_PREREMOVE(head, elm, field)
#define	QUEUEDEBUG_ASN1_TAILQ_POSTREMOVE(elm, field)
#endif

#define	ASN1_TAILQ_INIT(head) do {					\
	(head)->tqh_first = NULL;					\
	(head)->tqh_last = &(head)->tqh_first;				\
} while (/*CONSTCOND*/0)

#define	ASN1_TAILQ_INSERT_HEAD(head, elm, field) do {			\
	QUEUEDEBUG_ASN1_TAILQ_INSERT_HEAD((head), (elm), field)		\
	if (((elm)->field.tqe_next = (head)->tqh_first) != NULL)	\
		(head)->tqh_first->field.tqe_prev =			\
		    &(elm)->field.tqe_next;				\
	else								\
		(head)->tqh_last = &(elm)->field.tqe_next;		\
	(head)->tqh_first = (elm);					\
	(elm)->field.tqe_prev = &(head)->tqh_first;			\
} while (/*CONSTCOND*/0)

#define	ASN1_TAILQ_INSERT_TAIL(head, elm, field) do {			\
	QUEUEDEBUG_ASN1_TAILQ_INSERT_TAIL((head), (elm), field)		\
	(elm)->field.tqe_next = NULL;					\
	(elm)->field.tqe_prev = (head)->tqh_last;			\
	*(head)->tqh_last = (elm);					\
	(head)->tqh_last = &(elm)->field.tqe_next;			\
} while (/*CONSTCOND*/0)

#define	ASN1_TAILQ_INSERT_AFTER(head, listelm, elm, field) do {		\
	QUEUEDEBUG_ASN1_TAILQ_OP((listelm), field)			\
	if (((elm)->field.tqe_next = (listelm)->field.tqe_next) != NULL)\
		(elm)->field.tqe_next->field.tqe_prev = 		\
		    &(elm)->field.tqe_next;				\
	else								\
		(head)->tqh_last = &(elm)->field.tqe_next;		\
	(listelm)->field.tqe_next = (elm);				\
	(elm)->field.tqe_prev = &(listelm)->field.tqe_next;		\
} while (/*CONSTCOND*/0)

#define	ASN1_TAILQ_INSERT_BEFORE(listelm, elm, field) do {		\
	QUEUEDEBUG_ASN1_TAILQ_OP((listelm), field)			\
	(elm)->field.tqe_prev = (listelm)->field.tqe_prev;		\
	(elm)->field.tqe_next = (listelm);				\
	*(listelm)->field.tqe_prev = (elm);				\
	(listelm)->field.tqe_prev = &(elm)->field.tqe_next;		\
} while (/*CONSTCOND*/0)

#define	ASN1_TAILQ_REMOVE(head, elm, field) do {			\
	QUEUEDEBUG_ASN1_TAILQ_PREREMOVE((head), (elm), field)		\
	QUEUEDEBUG_ASN1_TAILQ_OP((elm), field)				\
	if (((elm)->field.tqe_next) != NULL)				\
		(elm)->field.tqe_next->field.tqe_prev = 		\
		    (elm)->field.tqe_prev;				\
	else								\
		(head)->tqh_last = (elm)->field.tqe_prev;		\
	*(elm)->field.tqe_prev = (elm)->field.tqe_next;			\
	QUEUEDEBUG_ASN1_TAILQ_POSTREMOVE((elm), field);			\
} while (/*CONSTCOND*/0)

#define	ASN1_TAILQ_FOREACH(var, head, field)				\
	for ((var) = ((head)->tqh_first);				\
		(var);							\
		(var) = ((var)->field.tqe_next))

#define	ASN1_TAILQ_FOREACH_REVERSE(var, head, headname, field)		\
	for ((var) = (*(((struct headname *)((head)->tqh_last))->tqh_last)); \
		(var);							\
		(var) = (*(((struct headname *)((var)->field.tqe_prev))->tqh_last)))

/*
 * Tail queue access methods.
 */
#define	ASN1_TAILQ_EMPTY(head)		((head)->tqh_first == NULL)
#define	ASN1_TAILQ_FIRST(head)		((head)->tqh_first)
#define	ASN1_TAILQ_NEXT(elm, field)		((elm)->field.tqe_next)

#define	ASN1_TAILQ_LAST(head, headname) \
	(*(((struct headname *)((head)->tqh_last))->tqh_last))
#define	ASN1_TAILQ_PREV(elm, headname, field) \
	(*(((struct headname *)((elm)->field.tqe_prev))->tqh_last))


#endif	/* !_ASN1_QUEUE_H_ */