[unix-history] / usr / src / include / struct.h

/*-
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)struct.h	8.1 (Berkeley) %G%
 */

#ifndef _STRUCT_H_
#define	_STRUCT_H_

/* Offset of the field in the structure. */
#define	fldoff(name, field) \
	((int)&(((struct name *)0)->field))

/* Size of the field in the structure. */
#define	fldsiz(name, field) \
	(sizeof(((struct name *)0)->field))

/* Address of the structure from a field. */
#define	strbase(name, addr, field) \
	((struct name *)((char *)(addr) - fldoff(name, field)))

#endif /* !_STRUCT_H_ */
Commit	Line	Data
3cc64cba	1	/*-
56559b70 KB	2	* Copyright (c) 1983, 1993
56559b70 KB	3	* The Regents of the University of California. All rights reserved.
3cc64cba KB	4	*
	5	* %sccs.include.redist.c%
	6	*
56559b70	7	* @(#)struct.h 8.1 (Berkeley) %G%
e8453270 SL	8	*/
e8453270 SL	9
d2b7358e KB	10	#ifndef _STRUCT_H_
	11	#define _STRUCT_H_
	12
3cc64cba KB	13	/* Offset of the field in the structure. */
	14	#define fldoff(name, field) \
	15	((int)&(((struct name *)0)->field))
	16
	17	/* Size of the field in the structure. */
	18	#define fldsiz(name, field) \
	19	(sizeof(((struct name *)0)->field))
	20
	21	/* Address of the structure from a field. */
	22	#define strbase(name, addr, field) \
	23	((struct name )((char )(addr) - fldoff(name, field)))
d2b7358e KB	24
d2b7358e KB	25	#endif /* !_STRUCT_H_ */