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      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 #ifndef __STDDEF_H
     27 #define __STDDEF_H
     28 
     29 #if !defined(_PTRDIFF_T) || __has_feature(modules)
     30 /* Always define ptrdiff_t when modules are available. */
     31 #if !__has_feature(modules)
     32 #define _PTRDIFF_T
     33 #endif
     34 typedef __PTRDIFF_TYPE__ ptrdiff_t;
     35 #endif
     36 
     37 #if !defined(_SIZE_T) || __has_feature(modules)
     38 /* Always define size_t when modules are available. */
     39 #if !__has_feature(modules)
     40 #define _SIZE_T
     41 #endif
     42 typedef __SIZE_TYPE__ size_t;
     43 #endif
     44 
     45 /* ISO9899:2011 7.20 (C11 Annex K): Define rsize_t if __STDC_WANT_LIB_EXT1__ is
     46  * enabled. */
     47 #if (defined(__STDC_WANT_LIB_EXT1__) && __STDC_WANT_LIB_EXT1__ >= 1 && \
     48      !defined(_RSIZE_T)) || __has_feature(modules)
     49 /* Always define rsize_t when modules are available. */
     50 #if !__has_feature(modules)
     51 #define _RSIZE_T
     52 #endif
     53 typedef __SIZE_TYPE__ rsize_t;
     54 #endif
     55 
     56 #ifndef __cplusplus
     57 /* Always define wchar_t when modules are available. */
     58 #if !defined(_WCHAR_T) || __has_feature(modules)
     59 #if !__has_feature(modules)
     60 #define _WCHAR_T
     61 #if defined(_MSC_EXTENSIONS)
     62 #define _WCHAR_T_DEFINED
     63 #endif
     64 #endif
     65 typedef __WCHAR_TYPE__ wchar_t;
     66 #endif
     67 #endif
     68 
     69 #undef NULL
     70 #ifdef __cplusplus
     71 #  if !defined(__MINGW32__) && !defined(_MSC_VER)
     72 #    define NULL __null
     73 #  else
     74 #    define NULL 0
     75 #  endif
     76 #else
     77 #  define NULL ((void*)0)
     78 #endif
     79 
     80 #ifdef __cplusplus
     81 #if defined(_MSC_EXTENSIONS) && defined(_NATIVE_NULLPTR_SUPPORTED)
     82 namespace std { typedef decltype(nullptr) nullptr_t; }
     83 using ::std::nullptr_t;
     84 #endif
     85 #endif
     86 
     87 #define offsetof(t, d) __builtin_offsetof(t, d)
     88 
     89 #endif /* __STDDEF_H */
     90 
     91 /* Some C libraries expect to see a wint_t here. Others (notably MinGW) will use
     92 __WINT_TYPE__ directly; accommodate both by requiring __need_wint_t */
     93 #if defined(__need_wint_t)
     94 /* Always define wint_t when modules are available. */
     95 #if !defined(_WINT_T) || __has_feature(modules)
     96 #if !__has_feature(modules)
     97 #define _WINT_T
     98 #endif
     99 typedef __WINT_TYPE__ wint_t;
    100 #endif
    101 #undef __need_wint_t
    102 #endif /* __need_wint_t */
    103