1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2005-2008 Poul-Henning Kamp
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31#define ALLOC_OBJ(to, type_magic)					\
32	do {								\
33		(to) = calloc(1, sizeof *(to));				\
34		if ((to) != NULL)					\
35			(to)->magic = (type_magic);			\
36	} while (0)
37
38#define FREE_OBJ(to)							\
39	do {								\
40		(to)->magic = (0);					\
41		free(to);						\
42	} while (0)
43
44#define VALID_OBJ(ptr, type_magic)					\
45	((ptr) != NULL && (ptr)->magic == (type_magic))
46
47#define CHECK_OBJ(ptr, type_magic)					\
48	do {								\
49		assert((ptr)->magic == type_magic);			\
50	} while (0)
51
52#define CHECK_OBJ_NOTNULL(ptr, type_magic)				\
53	do {								\
54		assert((ptr) != NULL);					\
55		assert((ptr)->magic == type_magic);			\
56	} while (0)
57
58#define CHECK_OBJ_ORNULL(ptr, type_magic)				\
59	do {								\
60		if ((ptr) != NULL)					\
61			assert((ptr)->magic == type_magic);		\
62	} while (0)
63
64#define CAST_OBJ(to, from, type_magic)					\
65	do {								\
66		(to) = (from);						\
67		if ((to) != NULL)					\
68			CHECK_OBJ((to), (type_magic));			\
69	} while (0)
70
71#define CAST_OBJ_NOTNULL(to, from, type_magic)				\
72	do {								\
73		(to) = (from);						\
74		assert((to) != NULL);					\
75		CHECK_OBJ((to), (type_magic));				\
76	} while (0)
77