stddef.h revision c814c64c6f7e7a26f4af0d040ad04b69917a36c8 
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
34typedef __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
42typedef __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
53typedef __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
65typedef __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)
82namespace std { typedef decltype(nullptr) nullptr_t; }
83using ::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
99typedef __WINT_TYPE__ wint_t;
100#endif
101#undef __need_wint_t
102#endif /* __need_wint_t */
103