/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2005-2008 Poul-Henning Kamp
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 *
 * $FreeBSD$
 */

#define ALLOC_OBJ(to, type_magic)					\
	do {								\
		(to) = calloc(1, sizeof *(to));				\
		if ((to) != NULL)					\
			(to)->magic = (type_magic);			\
	} while (0)

#define FREE_OBJ(to)							\
	do {								\
		(to)->magic = (0);					\
		free(to);						\
	} while (0)

#define VALID_OBJ(ptr, type_magic)					\
	((ptr) != NULL && (ptr)->magic == (type_magic))

#define CHECK_OBJ(ptr, type_magic)					\
	do {								\
		assert((ptr)->magic == type_magic);			\
	} while (0)

#define CHECK_OBJ_NOTNULL(ptr, type_magic)				\
	do {								\
		assert((ptr) != NULL);					\
		assert((ptr)->magic == type_magic);			\
	} while (0)

#define CHECK_OBJ_ORNULL(ptr, type_magic)				\
	do {								\
		if ((ptr) != NULL)					\
			assert((ptr)->magic == type_magic);		\
	} while (0)

#define CAST_OBJ(to, from, type_magic)					\
	do {								\
		(to) = (from);						\
		if ((to) != NULL)					\
			CHECK_OBJ((to), (type_magic));			\
	} while (0)

#define CAST_OBJ_NOTNULL(to, from, type_magic)				\
	do {								\
		(to) = (from);						\
		assert((to) != NULL);					\
		CHECK_OBJ((to), (type_magic));				\
	} while (0)