reactos/include/msvcrt/stddef.h

   1 /*
   2  * stddef.h
   3  *
   4  * Standard type definitions provided by the C library.
   5  *
   6  * NOTE: Actually supplied by the compiler (correct?). As such, GCC
   7  *       supplies a version of this header file. Unfortunately, GCC's
   8  *       version is all tied up with the way other headers for the
   9  *       GNU C library are implemented (or vice-versa), in a similar
  10  *       way to how the other Mingw32 headers are dependent on
  11  *       certain internals of this file. It is not clear to me whether
  12  *       you can safely use the GCC version in place of this version.
  13  *       TODO: Line up usage in other header files to work with GCC
  14  *       stddef.h.
  15  *
  16  * This file is part of the Mingw32 package.
  17  *
  18  * Contributors:
  19  *  Created by Colin Peters <colin@bird.fu.is.saga-u.ac.jp>
  20  *
  21  *  THIS SOFTWARE IS NOT COPYRIGHTED
  22  *
  23  *  This source code is offered for use in the public domain. You may
  24  *  use, modify or distribute it freely.
  25  *
  26  *  This code is distributed in the hope that it will be useful but
  27  *  WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY
  28  *  DISCLAMED. This includes but is not limited to warranties of
  29  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  30  *
  31  * $Revision: 1.5 $
  32  * $Author: chorns $
  33  * $Date: 2002/09/08 10:22:31 $
  34  *
  35  */
  36
  37
  38 #ifndef __MSVCRT_STDDEF_H_
  39
  40 /*
  41  * Any one of these symbols __need_* means that a standard header file
  42  * wants us just to define one data type.  So don't define
  43  * the symbols that indicate this file's entire job has been done.
  44  */
  45 #if (!defined(__need_wchar_t) && !defined(__need_wint_t)        \
  46      && !defined(__need_size_t) && !defined(__need_ptrdiff_t)   \
  47      && !defined(__need_NULL))
  48 #define __MSVCRT_STDDEF_H_
  49 #endif
  50
  51 /*
  52  * NOTE: The following typedefs are done using __xxx_TYPE__ defines followed
  53  * by typedefs using those defines. I have chosen to do it this way because
  54  * GCC supplies definitions for __xxx_TYPE__ macros and if, for example, your
  55  * size_t is typedef'ed differently from what GCC expects it will give you
  56  * warnings when you prototype functions like memcmp and memcpy. The values
  57  * for __xxx_TYPE__ in this header file are the same as those given by GCC.
  58  * Those values appear to work with the MSVCRT functions.
  59  */
  60
  61 /*
  62  * Signed type of difference of two pointers.
  63  */
  64
  65 /* Define this type if we are doing the whole job, or if we want this type
  66  * in particular.  */
  67 #if defined (__MSVCRT_STDDEF_H_) || defined (__need_ptrdiff_t)
  68
  69 #ifndef _PTRDIFF_T_
  70 #define _PTRDIFF_T_
  71 #ifndef __PTRDIFF_TYPE__
  72 #define __PTRDIFF_TYPE__        int
  73 #endif
  74 typedef __PTRDIFF_TYPE__        ptrdiff_t;
  75 #endif
  76
  77 /* If this symbol has done its job, get rid of it.  */
  78 #undef  __need_ptrdiff_t
  79
  80 #endif /* __MSVCRT_STDDEF_H_ or __need_ptrdiff_t.  */
  81
  82 /*
  83  * Unsigned type of `sizeof' something.
  84  */
  85
  86
  87 /* Define this type if we are doing the whole job,
  88  * or if we want this type in particular.  */
  89 #if defined (__MSVCRT_STDDEF_H_) || defined (__need_size_t)
  90
  91 #ifndef _SIZE_T_
  92 #define _SIZE_T_
  93 #define SIZE_T_DEFINED
  94 #define _SIZE_T
  95 #ifndef __SIZE_TYPE__
  96 #define __SIZE_TYPE__           unsigned int
  97 #endif
  98 typedef __SIZE_TYPE__           size_t;
  99 #endif
 100
 101 #undef  __need_size_t
 102
 103 #endif /* __MSVCRT_STDDEF_H_ or __need_size_t.  */
 104
 105 /* Wide character type.
 106    Locale-writers should change this as necessary to
 107    be big enough to hold unique values not between 0 and 127,
 108    and not (wchar_t) -1, for each defined multibyte character.  */
 109
 110 /* Define this type if we are doing the whole job,
 111    or if we want this type in particular.  */
 112 #if defined (__MSVCRT_STDDEF_H_) || defined (__need_wchar_t)
 113
 114 #ifndef _WCHAR_T_
 115 #define _WCHAR_T_
 116 #define _WCHAR_T
 117 #define _WCHAR_T_DEFINED
 118 #ifndef __WCHAR_TYPE__
 119 #define __WCHAR_TYPE__          short unsigned int
 120 #endif
 121 #ifndef __cplusplus
 122 typedef __WCHAR_TYPE__          wchar_t;
 123 #endif  /* C++ */
 124 #endif  /* wchar_t not already defined */
 125
 126 #undef  __need_wchar_t
 127
 128 #endif  /* __MSVCRT_STDDEF_H_ or __need_wchar_t. */
 129
 130 /*
 131  * wint_t, the equivalent of int in wchar ctype functions.
 132  */
 133 #if defined (__MSVCRT_STDDEF_H_) || defined (__need_wint_t)
 134
 135 #ifndef _WINT_T_
 136 #define _WINT_T_
 137 #define _WINT_T         /* To satisfy libstdc++ */
 138 #ifndef __WINT_TYPE__
 139 #define __WINT_TYPE__           short int
 140 #endif  /* Not defined __WINT_TYPE__ */
 141
 142 typedef __WINT_TYPE__           wint_t;
 143 #endif  /* Not defined _WINT_T_ */
 144
 145 #undef  __need_wint_t
 146
 147 #endif  /* __MSVCRT_STDDEF_H_ or __need_wint_t. */
 148
 149
 150 /*
 151  * A null pointer constant.
 152  */
 153
 154 #if defined (__MSVCRT_STDDEF_H_) || defined (__need_NULL)
 155
 156 #undef NULL
 157 #define NULL (0)
 158 #endif /* __MSVCRT_STDDEF_H_ or __need_NULL */
 159
 160 #undef  __need_NULL
 161
 162
 163 /*
 164  * Offsetof, a macro for finding the offset of a member in a structure.
 165  * Works by returning the 'address' of the MEMBER of a TYPE struct at address
 166  * zero.
 167  */
 168
 169 #if defined (__MSVCRT_STDDEF_H_)
 170 #define offsetof(TYPE, MEMBER)  ((size_t) &( ((TYPE *) 0)->MEMBER ))
 171 #endif  /* __MSVCRT_STDDEF_H_ */
 172
 173
 174 #endif /* not __MSVCRT_STDDEF_H_ */