StdLib/Include/stddef.h

   1 /** @file
   2   Common Definitions.
   3
   4 Copyright (c) 2010, Intel Corporation. All rights reserved.<BR>
   5 This program and the accompanying materials are licensed and made available under
   6 the terms and conditions of the BSD License that accompanies this distribution.
   7 The full text of the license may be found at
   8 http://opensource.org/licenses/bsd-license.php.
   9
  10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14 #ifndef _STDDEF_H
  15 #define _STDDEF_H
  16 #include  <sys/EfiCdefs.h>
  17
  18 /** ptrdiff_t is the signed integer type of the result of subtracting two pointers.
  19 **/
  20 #ifdef _EFI_PTRDIFF_T_
  21   typedef _EFI_PTRDIFF_T_  ptrdiff_t;
  22   #undef _EFI_PTRDIFF_T_
  23 #endif
  24
  25 /** size_t is the unsigned integer type of the result of the sizeof operator.
  26 **/
  27 #ifdef _EFI_SIZE_T_
  28   typedef _EFI_SIZE_T_  size_t;
  29   #undef _EFI_SIZE_T_
  30   #undef _BSD_SIZE_T_
  31 #endif
  32
  33 /** wchar_t is an integer type whose range of values can represent distinct
  34     codes for all members of the largest extended character set specified among
  35     the supported locales.  The null character shall have the code value zero.
  36 **/
  37 #ifndef __cplusplus
  38   #ifdef _EFI_WCHAR_T
  39     typedef _EFI_WCHAR_T wchar_t;
  40     #undef  _EFI_WCHAR_T
  41     #undef _BSD_WCHAR_T_
  42   #endif
  43 #endif
  44
  45 /** NULL expands to an implementation-defined null pointer constant.
  46     NULL is defined in MdePkg/Include/Base.h which is automatically included
  47     by the EDK II build tools.
  48 **/
  49
  50 /** offsetof(type, member-designator) expands to an integer constant expression
  51     that has type size_t, the value of which is the offset in bytes, to the
  52     structure member (designated by member-designator), from the beginning of
  53     its structure (designated by type). The type and member designator shall be
  54     such that given<BR>
  55     static type t;<BR>
  56     then the expression &(t.member-designator) evaluates to an address constant.
  57     (If the specified member is a bit-field, the behavior is undefined.)
  58
  59     Alliased to OFFSET_OF which is defined in MdePkg/Include/Base.h which is
  60     automatically included by the EDK II build tools.
  61 **/
  62 #define offsetof(type, member)  OFFSET_OF(type, member)
  63
  64 #endif  /* _STDDEF_H */