stddef.h revision 88318139c94cef1a77cce969613bbc0745d7e99f 
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