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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 #ifndef _PTRDIFF_T
     30 #define _PTRDIFF_T
     31 typedef __typeof__(((int*)0)-((int*)0)) ptrdiff_t;
     32 #endif
     33 #ifndef _SIZE_T
     34 #define _SIZE_T
     35 typedef __typeof__(sizeof(int)) size_t;
     36 #endif
     37 #ifndef __cplusplus
     38 #ifndef _WCHAR_T
     39 #define _WCHAR_T
     40 typedef __WCHAR_TYPE__ wchar_t;
     41 #endif
     42 #endif
     43 
     44 #undef NULL
     45 #ifdef __cplusplus
     46 #undef __null  // VC++ hack.
     47 #define NULL __null
     48 #else
     49 #define NULL ((void*)0)
     50 #endif
     51 
     52 #define offsetof(t, d) __builtin_offsetof(t, d)
     53 
     54 #endif /* __STDDEF_H */
     55 
     56 /* Some C libraries expect to see a wint_t here. Others (notably MinGW) will use
     57 __WINT_TYPE__ directly; accommodate both by requiring __need_wint_t */
     58 #if defined(__need_wint_t)
     59 #if !defined(_WINT_T)
     60 #define _WINT_T
     61 typedef __WINT_TYPE__ wint_t;
     62 #endif /* _WINT_T */
     63 #undef __need_wint_t
     64 #endif /* __need_wint_t */
     65