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 #if !defined(__STDDEF_H) || defined(__need_ptrdiff_t) || \ 27 defined(__need_size_t) || defined(__need_wchar_t) || \ 28 defined(__need_NULL) || defined(__need_wint_t) 29 30 #if !defined(__need_ptrdiff_t) && !defined(__need_size_t) && \ 31 !defined(__need_wchar_t) && !defined(__need_NULL) && \ 32 !defined(__need_wint_t) 33 /* Always define miscellaneous pieces when modules are available. */ 34 #if !__has_feature(modules) 35 #define __STDDEF_H 36 #endif 37 #define __need_ptrdiff_t 38 #define __need_size_t 39 #define __need_wchar_t 40 #define __need_NULL 41 #define __need_STDDEF_H_misc 42 /* __need_wint_t is intentionally not defined here. */ 43 #endif 44 45 #if defined(__need_ptrdiff_t) 46 #if !defined(_PTRDIFF_T) || __has_feature(modules) 47 /* Always define ptrdiff_t when modules are available. */ 48 #if !__has_feature(modules) 49 #define _PTRDIFF_T 50 #endif 51 typedef __PTRDIFF_TYPE__ ptrdiff_t; 52 #endif 53 #undef __need_ptrdiff_t 54 #endif /* defined(__need_ptrdiff_t) */ 55 56 #if defined(__need_size_t) 57 #if !defined(_SIZE_T) || __has_feature(modules) 58 /* Always define size_t when modules are available. */ 59 #if !__has_feature(modules) 60 #define _SIZE_T 61 #endif 62 typedef __SIZE_TYPE__ size_t; 63 #endif 64 #undef __need_size_t 65 #endif /*defined(__need_size_t) */ 66 67 #if defined(__need_STDDEF_H_misc) 68 /* ISO9899:2011 7.20 (C11 Annex K): Define rsize_t if __STDC_WANT_LIB_EXT1__ is 69 * enabled. */ 70 #if (defined(__STDC_WANT_LIB_EXT1__) && __STDC_WANT_LIB_EXT1__ >= 1 && \ 71 !defined(_RSIZE_T)) || __has_feature(modules) 72 /* Always define rsize_t when modules are available. */ 73 #if !__has_feature(modules) 74 #define _RSIZE_T 75 #endif 76 typedef __SIZE_TYPE__ rsize_t; 77 #endif 78 #endif /* defined(__need_STDDEF_H_misc) */ 79 80 #if defined(__need_wchar_t) 81 #ifndef __cplusplus 82 /* Always define wchar_t when modules are available. */ 83 #if !defined(_WCHAR_T) || __has_feature(modules) 84 #if !__has_feature(modules) 85 #define _WCHAR_T 86 #if defined(_MSC_EXTENSIONS) 87 #define _WCHAR_T_DEFINED 88 #endif 89 #endif 90 typedef __WCHAR_TYPE__ wchar_t; 91 #endif 92 #endif 93 #undef __need_wchar_t 94 #endif /* defined(__need_wchar_t) */ 95 96 #if defined(__need_NULL) 97 #undef NULL 98 #ifdef __cplusplus 99 # if !defined(__MINGW32__) && !defined(_MSC_VER) 100 # define NULL __null 101 # else 102 # define NULL 0 103 # endif 104 #else 105 # define NULL ((void*)0) 106 #endif 107 #ifdef __cplusplus 108 #if defined(_MSC_EXTENSIONS) && defined(_NATIVE_NULLPTR_SUPPORTED) 109 namespace std { typedef decltype(nullptr) nullptr_t; } 110 using ::std::nullptr_t; 111 #endif 112 #endif 113 #undef __need_NULL 114 #endif /* defined(__need_NULL) */ 115 116 #if defined(__need_STDDEF_H_misc) 117 #if __STDC_VERSION__ >= 201112L || __cplusplus >= 201103L 118 #include "__stddef_max_align_t.h" 119 #endif 120 #define offsetof(t, d) __builtin_offsetof(t, d) 121 #undef __need_STDDEF_H_misc 122 #endif /* defined(__need_STDDEF_H_misc) */ 123 124 /* Some C libraries expect to see a wint_t here. Others (notably MinGW) will use 125 __WINT_TYPE__ directly; accommodate both by requiring __need_wint_t */ 126 #if defined(__need_wint_t) 127 /* Always define wint_t when modules are available. */ 128 #if !defined(_WINT_T) || __has_feature(modules) 129 #if !__has_feature(modules) 130 #define _WINT_T 131 #endif 132 typedef __WINT_TYPE__ wint_t; 133 #endif 134 #undef __need_wint_t 135 #endif /* __need_wint_t */ 136 137 #endif 138