stddef.h revision 210299
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 29typedef __typeof__(((int*)0)-((int*)0)) ptrdiff_t; 30#ifndef _SIZE_T 31#define _SIZE_T 32typedef __typeof__(sizeof(int)) size_t; 33#endif 34#ifndef __cplusplus 35#ifndef _WCHAR_T 36#define _WCHAR_T 37typedef __typeof__(*L"") wchar_t; 38#endif 39#endif 40 41#undef NULL 42#ifdef __cplusplus 43#define NULL __null 44#else 45#define NULL ((void*)0) 46#endif 47 48// Some C libraries expect to see a wint_t here. Others (notably MinGW) will use 49// __WINT_TYPE__ directly; accomodate both by requiring __need_wint_t 50#if defined(__need_wint_t) && !defined(_WINT_T) 51#define _WINT_T 52typedef __WINT_TYPE__ wint_t; 53#endif 54 55#define offsetof(t, d) __builtin_offsetof(t, d) 56 57#endif /* __STDDEF_H */ 58