Home | History | Annotate | Download | only in Headers
      1 /*===---- stddef.h - Basic type definitions --------------------------------===
      2  *
      3  * Copyright (c) 2008 Eli Friedman
      4  *
      5  * Permission is hereby granted, free of charge, to any person obtaining a copy
      6  * of this software and associated documentation files (the "Software"), to deal
      7  * in the Software without restriction, including without limitation the rights
      8  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
      9  * copies of the Software, and to permit persons to whom the Software is
     10  * furnished to do so, subject to the following conditions:
     11  *
     12  * The above copyright notice and this permission notice shall be included in
     13  * all copies or substantial portions of the Software.
     14  *
     15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     21  * THE SOFTWARE.
     22  *
     23  *===-----------------------------------------------------------------------===
     24  */
     25 
     26 #if !defined(__STDDEF_H) || defined(__need_ptrdiff_t) ||                       \
     27     defined(__need_size_t) || defined(__need_wchar_t) ||                       \
     28     defined(__need_NULL) || defined(__need_wint_t)
     29 
     30 #if !defined(__need_ptrdiff_t) && !defined(__need_size_t) &&                   \
     31     !defined(__need_wchar_t) && !defined(__need_NULL) &&                       \
     32     !defined(__need_wint_t)
     33 /* Always define miscellaneous pieces when modules are available. */
     34 #if !__has_feature(modules)
     35 #define __STDDEF_H
     36 #endif
     37 #define __need_ptrdiff_t
     38 #define __need_size_t
     39 #define __need_wchar_t
     40 #define __need_NULL
     41 #define __need_STDDEF_H_misc
     42 /* __need_wint_t is intentionally not defined here. */
     43 #endif
     44 
     45 #if defined(__need_ptrdiff_t)
     46 #if !defined(_PTRDIFF_T) || __has_feature(modules)
     47 /* Always define ptrdiff_t when modules are available. */
     48 #if !__has_feature(modules)
     49 #define _PTRDIFF_T
     50 #endif
     51 typedef __PTRDIFF_TYPE__ ptrdiff_t;
     52 #endif
     53 #undef __need_ptrdiff_t
     54 #endif /* defined(__need_ptrdiff_t) */
     55 
     56 #if defined(__need_size_t)
     57 #if !defined(_SIZE_T) || __has_feature(modules)
     58 /* Always define size_t when modules are available. */
     59 #if !__has_feature(modules)
     60 #define _SIZE_T
     61 #endif
     62 typedef __SIZE_TYPE__ size_t;
     63 #endif
     64 #undef __need_size_t
     65 #endif /*defined(__need_size_t) */
     66 
     67 #if defined(__need_STDDEF_H_misc)
     68 /* ISO9899:2011 7.20 (C11 Annex K): Define rsize_t if __STDC_WANT_LIB_EXT1__ is
     69  * enabled. */
     70 #if (defined(__STDC_WANT_LIB_EXT1__) && __STDC_WANT_LIB_EXT1__ >= 1 && \
     71      !defined(_RSIZE_T)) || __has_feature(modules)
     72 /* Always define rsize_t when modules are available. */
     73 #if !__has_feature(modules)
     74 #define _RSIZE_T
     75 #endif
     76 typedef __SIZE_TYPE__ rsize_t;
     77 #endif
     78 #endif /* defined(__need_STDDEF_H_misc) */
     79 
     80 #if defined(__need_wchar_t)
     81 #ifndef __cplusplus
     82 /* Always define wchar_t when modules are available. */
     83 #if !defined(_WCHAR_T) || __has_feature(modules)
     84 #if !__has_feature(modules)
     85 #define _WCHAR_T
     86 #if defined(_MSC_EXTENSIONS)
     87 #define _WCHAR_T_DEFINED
     88 #endif
     89 #endif
     90 typedef __WCHAR_TYPE__ wchar_t;
     91 #endif
     92 #endif
     93 #undef __need_wchar_t
     94 #endif /* defined(__need_wchar_t) */
     95 
     96 #if defined(__need_NULL)
     97 #undef NULL
     98 #ifdef __cplusplus
     99 #  if !defined(__MINGW32__) && !defined(_MSC_VER)
    100 #    define NULL __null
    101 #  else
    102 #    define NULL 0
    103 #  endif
    104 #else
    105 #  define NULL ((void*)0)
    106 #endif
    107 #ifdef __cplusplus
    108 #if defined(_MSC_EXTENSIONS) && defined(_NATIVE_NULLPTR_SUPPORTED)
    109 namespace std { typedef decltype(nullptr) nullptr_t; }
    110 using ::std::nullptr_t;
    111 #endif
    112 #endif
    113 #undef __need_NULL
    114 #endif /* defined(__need_NULL) */
    115 
    116 #if defined(__need_STDDEF_H_misc)
    117 #if __STDC_VERSION__ >= 201112L || __cplusplus >= 201103L
    118 #include "__stddef_max_align_t.h"
    119 #endif
    120 #define offsetof(t, d) __builtin_offsetof(t, d)
    121 #undef __need_STDDEF_H_misc
    122 #endif  /* defined(__need_STDDEF_H_misc) */
    123 
    124 /* Some C libraries expect to see a wint_t here. Others (notably MinGW) will use
    125 __WINT_TYPE__ directly; accommodate both by requiring __need_wint_t */
    126 #if defined(__need_wint_t)
    127 /* Always define wint_t when modules are available. */
    128 #if !defined(_WINT_T) || __has_feature(modules)
    129 #if !__has_feature(modules)
    130 #define _WINT_T
    131 #endif
    132 typedef __WINT_TYPE__ wint_t;
    133 #endif
    134 #undef __need_wint_t
    135 #endif /* __need_wint_t */
    136 
    137 #endif
    138