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 #undef NULL 30 #ifdef __cplusplus 31 #if __cplusplus >= 201103L 32 #define NULL nullptr 33 #else 34 #undef __null // VC++ hack. 35 #define NULL __null 36 #endif 37 #elif defined(__has_feature) && __has_feature(bounds_attributes) 38 #define NULL __unsafe_forge_single(void *, 0) 39 #else 40 #define NULL ((void*)0) 41 #endif 42 43 #ifndef _PTRDIFF_T 44 #define _PTRDIFF_T 45 typedef __typeof__(((int*)NULL)-((int*)NULL)) ptrdiff_t; 46 #endif 47 #ifndef _SIZE_T 48 #define _SIZE_T 49 typedef __typeof__(sizeof(int)) size_t; 50 #endif 51 #ifndef __cplusplus 52 #ifndef _WCHAR_T 53 #define _WCHAR_T 54 typedef __WCHAR_TYPE__ wchar_t; 55 #endif 56 #endif 57 58 #ifndef offsetof 59 #define offsetof(t, d) __builtin_offsetof(t, d) 60 #endif 61 62 #endif /* __STDDEF_H */ 63 64 /* Some C libraries expect to see a wint_t here. Others (notably MinGW) will use 65 __WINT_TYPE__ directly; accommodate both by requiring __need_wint_t */ 66 #if defined(__need_wint_t) 67 #if !defined(_WINT_T) 68 #define _WINT_T 69 typedef __WINT_TYPE__ wint_t; 70 #endif /* _WINT_T */ 71 #undef __need_wint_t 72 #endif /* __need_wint_t */ 73