include/struct.h

   1 /*-
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)struct.h    8.1 (Berkeley) 6/2/93
  30  *
  31  * $FreeBSD: src/include/struct.h,v 1.1.1.1.14.1 2001/03/05 13:08:49 obrien Exp $
  32  * $DragonFly: src/include/struct.h,v 1.2 2003/06/17 04:25:56 dillon Exp $
  33  */
  34
  35 #ifndef _STRUCT_H_
  36 #define _STRUCT_H_
  37
  38 #if __GNUC__
  39 #warning "this file includes <struct.h> which is deprecated, use <stddef.h> instead"
  40 #endif
  41
  42 /* Offset of the field in the structure. */
  43 #define fldoff(name, field) \
  44         ((int)&(((struct name *)0)->field))
  45
  46 /* Size of the field in the structure. */
  47 #define fldsiz(name, field) \
  48         (sizeof(((struct name *)0)->field))
  49
  50 /* Address of the structure from a field. */
  51 #define strbase(name, addr, field) \
  52         ((struct name *)((char *)(addr) - fldoff(name, field)))
  53
  54 #endif /* !_STRUCT_H_ */