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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#ifndef ISC_MAGIC_H
#define ISC_MAGIC_H 1
#include <isc/likely.h>
/*! \file isc/magic.h */
typedef struct {
unsigned int magic;
} isc__magic_t;
/*%
* To use this macro the magic number MUST be the first thing in the
* structure, and MUST be of type "unsigned int".
* The intent of this is to allow magic numbers to be checked even though
* the object is otherwise opaque.
*/
#define ISC_MAGIC_VALID(a,b) (ISC_LIKELY((a) != NULL) && \
ISC_LIKELY(((const isc__magic_t *)(a))->magic == (b)))
#define ISC_MAGIC(a, b, c, d) ((a) << 24 | (b) << 16 | (c) << 8 | (d))
#endif /* ISC_MAGIC_H */