include/stddef.h

   1 /*      $NetBSD: stddef.h,v 1.17 2013/12/12 17:53:03 matt Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1990, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      @(#)stddef.h    8.1 (Berkeley) 6/2/93
  32  */
  33
  34 #ifndef _STDDEF_H_
  35 #define _STDDEF_H_
  36
  37 #include <sys/cdefs.h>
  38 #include <sys/featuretest.h>
  39 #include <machine/ansi.h>
  40
  41 #ifdef  _BSD_PTRDIFF_T_
  42 typedef _BSD_PTRDIFF_T_ ptrdiff_t;
  43 #undef  _BSD_PTRDIFF_T_
  44 #endif
  45
  46 #ifdef  _BSD_SIZE_T_
  47 typedef _BSD_SIZE_T_    size_t;
  48 #undef  _BSD_SIZE_T_
  49 #endif
  50
  51 #if defined(_BSD_WCHAR_T_) && !defined(__cplusplus)
  52 typedef _BSD_WCHAR_T_   wchar_t;
  53 #undef  _BSD_WCHAR_T_
  54 #endif
  55
  56 #include <sys/null.h>
  57
  58 #if __GNUC_PREREQ__(4, 0)
  59 #define offsetof(type, member)  __builtin_offsetof(type, member)
  60 #elif !defined(__cplusplus)
  61 #define offsetof(type, member)  ((size_t)(unsigned long)(&((type *)0)->member))
  62 #else
  63 #if !__GNUC_PREREQ__(3, 4)
  64 #define __offsetof__(a) a
  65 #endif
  66 #define offsetof(type, member) __offsetof__((reinterpret_cast<size_t> \
  67     (&reinterpret_cast<const volatile char &>(static_cast<type *>(0)->member))))
  68 #endif
  69
  70 #endif /* _STDDEF_H_ */