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

/*-
 * Copyright (c) 1983 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *	@(#)struct.h	5.1 (Berkeley) %G%
 */

/* 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)))
Commit	Line	Data
3cc64cba KB	1	/*-
	2	* Copyright (c) 1983 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* %sccs.include.redist.c%
	6	*
	7	* @(#)struct.h 5.1 (Berkeley) %G%
e8453270 SL	8	*/
e8453270 SL	9
3cc64cba KB	10	/* Offset of the field in the structure. */
	11	#define fldoff(name, field) \
	12	((int)&(((struct name *)0)->field))
	13
	14	/* Size of the field in the structure. */
	15	#define fldsiz(name, field) \
	16	(sizeof(((struct name *)0)->field))
	17
	18	/* Address of the structure from a field. */
	19	#define strbase(name, addr, field) \
	20	((struct name )((char )(addr) - fldoff(name, field)))