/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * 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.
 */

#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)