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Edit File: stddef.h
/* Copyright (C) 1989-2014 Free Software Foundation, Inc. This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see <http://www.gnu.org/licenses/>. */ /* * ISO C Standard: 7.17 Common definitions <stddef.h> */ #if (!defined(_STDDEF_H) && !defined(_STDDEF_H_) && !defined(_ANSI_STDDEF_H) \ && !defined(__STDDEF_H__)) \ || defined(__need_wchar_t) || defined(__need_size_t) \ || defined(__need_ptrdiff_t) || defined(__need_NULL) \ || defined(__need_wint_t) /* Any one of these symbols __need_* means that GNU libc wants us just to define one data type. So don't define the symbols that indicate this file's entire job has been done. */ #if (!defined(__need_wchar_t) && !defined(__need_size_t) \ && !defined(__need_ptrdiff_t) && !defined(__need_NULL) \ && !defined(__need_wint_t)) #define _STDDEF_H #define _STDDEF_H_ /* snaroff@next.com says the NeXT needs this. */ #define _ANSI_STDDEF_H #endif #ifndef __sys_stdtypes_h /* This avoids lossage on SunOS but only if stdtypes.h comes first. There's no way to win with the other order! Sun lossage. */ /* On 4.3bsd-net2, make sure ansi.h is included, so we have one less case to deal with in the following. */ #if defined (__BSD_NET2__) || defined (____386BSD____) || (defined (__FreeBSD__) && (__FreeBSD__ < 5)) || defined(__NetBSD__) #include <machine/ansi.h> #endif /* On FreeBSD 5, machine/ansi.h does not exist anymore... */ #if defined (__FreeBSD__) && (__FreeBSD__ >= 5) #include <sys/_types.h> #endif /* In 4.3bsd-net2, machine/ansi.h defines these symbols, which are defined if the corresponding type is *not* defined. FreeBSD-2.1 defines _MACHINE_ANSI_H_ instead of _ANSI_H_. NetBSD defines _I386_ANSI_H_ and _X86_64_ANSI_H_ instead of _ANSI_H_ */ #if defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_) || defined(_X86_64_ANSI_H_) || defined(_I386_ANSI_H_) #if !defined(_SIZE_T_) && !defined(_BSD_SIZE_T_) #define _SIZE_T #endif #if !defined(_PTRDIFF_T_) && !defined(_BSD_PTRDIFF_T_) #define _PTRDIFF_T #endif /* On BSD/386 1.1, at least, machine/ansi.h defines _BSD_WCHAR_T_ instead of _WCHAR_T_. */ #if !defined(_WCHAR_T_) && !defined(_BSD_WCHAR_T_) #ifndef _BSD_WCHAR_T_ #define _WCHAR_T #endif #endif /* Undef _FOO_T_ if we are supposed to define foo_t. */ #if defined (__need_ptrdiff_t) || defined (_STDDEF_H_) #undef _PTRDIFF_T_ #undef _BSD_PTRDIFF_T_ #endif #if defined (__need_size_t) || defined (_STDDEF_H_) #undef _SIZE_T_ #undef _BSD_SIZE_T_ #endif #if defined (__need_wchar_t) || defined (_STDDEF_H_) #undef _WCHAR_T_ #undef _BSD_WCHAR_T_ #endif #endif /* defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_) || defined(_X86_64_ANSI_H_) || defined(_I386_ANSI_H_) */ /* Sequent's header files use _PTRDIFF_T_ in some conflicting way. Just ignore it. */ #if defined (__sequent__) && defined (_PTRDIFF_T_) #undef _PTRDIFF_T_ #endif /* On VxWorks, <type/vxTypesBase.h> may have defined macros like _TYPE_size_t which will typedef size_t. fixincludes patched the vxTypesBase.h so that this macro is only defined if _GCC_SIZE_T is not defined, and so that defining this macro defines _GCC_SIZE_T. If we find that the macros are still defined at this point, we must invoke them so that the type is defined as expected. */ #if defined (_TYPE_ptrdiff_t) && (defined (__need_ptrdiff_t) || defined (_STDDEF_H_)) _TYPE_ptrdiff_t; #undef _TYPE_ptrdiff_t #endif #if defined (_TYPE_size_t) && (defined (__need_size_t) || defined (_STDDEF_H_)) _TYPE_size_t; #undef _TYPE_size_t #endif #if defined (_TYPE_wchar_t) && (defined (__need_wchar_t) || defined (_STDDEF_H_)) _TYPE_wchar_t; #undef _TYPE_wchar_t #endif /* In case nobody has defined these types, but we aren't running under GCC 2.00, make sure that __PTRDIFF_TYPE__, __SIZE_TYPE__, and __WCHAR_TYPE__ have reasonable values. This can happen if the parts of GCC is compiled by an older compiler, that actually include gstddef.h, such as collect2. */ /* Signed type of difference of two pointers. */ /* Define this type if we are doing the whole job, or if we want this type in particular. */ #if defined (_STDDEF_H) || defined (__need_ptrdiff_t) #ifndef _PTRDIFF_T /* in case <sys/types.h> has defined it. */ #ifndef _T_PTRDIFF_ #ifndef _T_PTRDIFF #ifndef __PTRDIFF_T #ifndef _PTRDIFF_T_ #ifndef _BSD_PTRDIFF_T_ #ifndef ___int_ptrdiff_t_h #ifndef _GCC_PTRDIFF_T #define _PTRDIFF_T #define _T_PTRDIFF_ #define _T_PTRDIFF #define __PTRDIFF_T #define _PTRDIFF_T_ #define _BSD_PTRDIFF_T_ #define ___int_ptrdiff_t_h #define _GCC_PTRDIFF_T #ifndef __PTRDIFF_TYPE__ #define __PTRDIFF_TYPE__ long int #endif typedef __PTRDIFF_TYPE__ ptrdiff_t; #endif /* _GCC_PTRDIFF_T */ #endif /* ___int_ptrdiff_t_h */ #endif /* _BSD_PTRDIFF_T_ */ #endif /* _PTRDIFF_T_ */ #endif /* __PTRDIFF_T */ #endif /* _T_PTRDIFF */ #endif /* _T_PTRDIFF_ */ #endif /* _PTRDIFF_T */ /* If this symbol has done its job, get rid of it. */ #undef __need_ptrdiff_t #endif /* _STDDEF_H or __need_ptrdiff_t. */ /* Unsigned type of `sizeof' something. */ /* Define this type if we are doing the whole job, or if we want this type in particular. */ #if defined (_STDDEF_H) || defined (__need_size_t) #ifndef __size_t__ /* BeOS */ #ifndef __SIZE_T__ /* Cray Unicos/Mk */ #ifndef _SIZE_T /* in case <sys/types.h> has defined it. */ #ifndef _SYS_SIZE_T_H #ifndef _T_SIZE_ #ifndef _T_SIZE #ifndef __SIZE_T #ifndef _SIZE_T_ #ifndef _BSD_SIZE_T_ #ifndef _SIZE_T_DEFINED_ #ifndef _SIZE_T_DEFINED #ifndef _BSD_SIZE_T_DEFINED_ /* Darwin */ #ifndef _SIZE_T_DECLARED /* FreeBSD 5 */ #ifndef ___int_size_t_h #ifndef _GCC_SIZE_T #ifndef _SIZET_ #ifndef __size_t #define __size_t__ /* BeOS */ #define __SIZE_T__ /* Cray Unicos/Mk */ #define _SIZE_T #define _SYS_SIZE_T_H #define _T_SIZE_ #define _T_SIZE #define __SIZE_T #define _SIZE_T_ #define _BSD_SIZE_T_ #define _SIZE_T_DEFINED_ #define _SIZE_T_DEFINED #define _BSD_SIZE_T_DEFINED_ /* Darwin */ #define _SIZE_T_DECLARED /* FreeBSD 5 */ #define ___int_size_t_h #define _GCC_SIZE_T #define _SIZET_ #if (defined (__FreeBSD__) && (__FreeBSD__ >= 5)) \ || defined(__FreeBSD_kernel__) /* __size_t is a typedef on FreeBSD 5, must not trash it. */ #elif defined (__VMS__) /* __size_t is also a typedef on VMS. */ #else #define __size_t #endif #ifndef __SIZE_TYPE__ #define __SIZE_TYPE__ long unsigned int #endif #if !(defined (__GNUG__) && defined (size_t)) typedef __SIZE_TYPE__ size_t; #ifdef __BEOS__ typedef long ssize_t; #endif /* __BEOS__ */ #endif /* !(defined (__GNUG__) && defined (size_t)) */ #endif /* __size_t */ #endif /* _SIZET_ */ #endif /* _GCC_SIZE_T */ #endif /* ___int_size_t_h */ #endif /* _SIZE_T_DECLARED */ #endif /* _BSD_SIZE_T_DEFINED_ */ #endif /* _SIZE_T_DEFINED */ #endif /* _SIZE_T_DEFINED_ */ #endif /* _BSD_SIZE_T_ */ #endif /* _SIZE_T_ */ #endif /* __SIZE_T */ #endif /* _T_SIZE */ #endif /* _T_SIZE_ */ #endif /* _SYS_SIZE_T_H */ #endif /* _SIZE_T */ #endif /* __SIZE_T__ */ #endif /* __size_t__ */ #undef __need_size_t #endif /* _STDDEF_H or __need_size_t. */ /* Wide character type. Locale-writers should change this as necessary to be big enough to hold unique values not between 0 and 127, and not (wchar_t) -1, for each defined multibyte character. */ /* Define this type if we are doing the whole job, or if we want this type in particular. */ #if defined (_STDDEF_H) || defined (__need_wchar_t) #ifndef __wchar_t__ /* BeOS */ #ifndef __WCHAR_T__ /* Cray Unicos/Mk */ #ifndef _WCHAR_T #ifndef _T_WCHAR_ #ifndef _T_WCHAR #ifndef __WCHAR_T #ifndef _WCHAR_T_ #ifndef _BSD_WCHAR_T_ #ifndef _BSD_WCHAR_T_DEFINED_ /* Darwin */ #ifndef _BSD_RUNE_T_DEFINED_ /* Darwin */ #ifndef _WCHAR_T_DECLARED /* FreeBSD 5 */ #ifndef _WCHAR_T_DEFINED_ #ifndef _WCHAR_T_DEFINED #ifndef _WCHAR_T_H #ifndef ___int_wchar_t_h #ifndef __INT_WCHAR_T_H #ifndef _GCC_WCHAR_T #define __wchar_t__ /* BeOS */ #define __WCHAR_T__ /* Cray Unicos/Mk */ #define _WCHAR_T #define _T_WCHAR_ #define _T_WCHAR #define __WCHAR_T #define _WCHAR_T_ #define _BSD_WCHAR_T_ #define _WCHAR_T_DEFINED_ #define _WCHAR_T_DEFINED #define _WCHAR_T_H #define ___int_wchar_t_h #define __INT_WCHAR_T_H #define _GCC_WCHAR_T #define _WCHAR_T_DECLARED /* On BSD/386 1.1, at least, machine/ansi.h defines _BSD_WCHAR_T_ instead of _WCHAR_T_, and _BSD_RUNE_T_ (which, unlike the other symbols in the _FOO_T_ family, stays defined even after its corresponding type is defined). If we define wchar_t, then we must undef _WCHAR_T_; for BSD/386 1.1 (and perhaps others), if we undef _WCHAR_T_, then we must also define rune_t, since headers like runetype.h assume that if machine/ansi.h is included, and _BSD_WCHAR_T_ is not defined, then rune_t is available. machine/ansi.h says, "Note that _WCHAR_T_ and _RUNE_T_ must be of the same type." */ #ifdef _BSD_WCHAR_T_ #undef _BSD_WCHAR_T_ #ifdef _BSD_RUNE_T_ #if !defined (_ANSI_SOURCE) && !defined (_POSIX_SOURCE) typedef _BSD_RUNE_T_ rune_t; #define _BSD_WCHAR_T_DEFINED_ #define _BSD_RUNE_T_DEFINED_ /* Darwin */ #if defined (__FreeBSD__) && (__FreeBSD__ < 5) /* Why is this file so hard to maintain properly? In contrast to the comment above regarding BSD/386 1.1, on FreeBSD for as long as the symbol has existed, _BSD_RUNE_T_ must not stay defined or redundant typedefs will occur when stdlib.h is included after this file. */ #undef _BSD_RUNE_T_ #endif #endif #endif #endif /* FreeBSD 5 can't be handled well using "traditional" logic above since it no longer defines _BSD_RUNE_T_ yet still desires to export rune_t in some cases... */ #if defined (__FreeBSD__) && (__FreeBSD__ >= 5) #if !defined (_ANSI_SOURCE) && !defined (_POSIX_SOURCE) #if __BSD_VISIBLE #ifndef _RUNE_T_DECLARED typedef __rune_t rune_t; #define _RUNE_T_DECLARED #endif #endif #endif #endif #ifndef __WCHAR_TYPE__ #define __WCHAR_TYPE__ int #endif #ifndef __cplusplus typedef __WCHAR_TYPE__ wchar_t; #endif #endif #endif #endif #endif #endif #endif #endif /* _WCHAR_T_DECLARED */ #endif /* _BSD_RUNE_T_DEFINED_ */ #endif #endif #endif #endif #endif #endif #endif #endif /* __WCHAR_T__ */ #endif /* __wchar_t__ */ #undef __need_wchar_t #endif /* _STDDEF_H or __need_wchar_t. */ #if defined (__need_wint_t) #ifndef _WINT_T #define _WINT_T #ifndef __WINT_TYPE__ #define __WINT_TYPE__ unsigned int #endif typedef __WINT_TYPE__ wint_t; #endif #undef __need_wint_t #endif /* In 4.3bsd-net2, leave these undefined to indicate that size_t, etc. are already defined. */ /* BSD/OS 3.1 and FreeBSD [23].x require the MACHINE_ANSI_H check here. */ /* NetBSD 5 requires the I386_ANSI_H and X86_64_ANSI_H checks here. */ #if defined(_ANSI_H_) || defined(_MACHINE_ANSI_H_) || defined(_X86_64_ANSI_H_) || defined(_I386_ANSI_H_) /* The references to _GCC_PTRDIFF_T_, _GCC_SIZE_T_, and _GCC_WCHAR_T_ are probably typos and should be removed before 2.8 is released. */ #ifdef _GCC_PTRDIFF_T_ #undef _PTRDIFF_T_ #undef _BSD_PTRDIFF_T_ #endif #ifdef _GCC_SIZE_T_ #undef _SIZE_T_ #undef _BSD_SIZE_T_ #endif #ifdef _GCC_WCHAR_T_ #undef _WCHAR_T_ #undef _BSD_WCHAR_T_ #endif /* The following ones are the real ones. */ #ifdef _GCC_PTRDIFF_T #undef _PTRDIFF_T_ #undef _BSD_PTRDIFF_T_ #endif #ifdef _GCC_SIZE_T #undef _SIZE_T_ #undef _BSD_SIZE_T_ #endif #ifdef _GCC_WCHAR_T #undef _WCHAR_T_ #undef _BSD_WCHAR_T_ #endif #endif /* _ANSI_H_ || _MACHINE_ANSI_H_ || _X86_64_ANSI_H_ || _I386_ANSI_H_ */ #endif /* __sys_stdtypes_h */ /* A null pointer constant. */ #if defined (_STDDEF_H) || defined (__need_NULL) #undef NULL /* in case <stdio.h> has defined it. */ #ifdef __GNUG__ #define NULL __null #else /* G++ */ #ifndef __cplusplus #define NULL ((void *)0) #else /* C++ */ #define NULL 0 #endif /* C++ */ #endif /* G++ */ #endif /* NULL not defined and <stddef.h> or need NULL. */ #undef __need_NULL #ifdef _STDDEF_H /* Offset of member MEMBER in a struct of type TYPE. */ #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER) #if (defined (__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) \ || (defined(__cplusplus) && __cplusplus >= 201103L) #ifndef _GCC_MAX_ALIGN_T #define _GCC_MAX_ALIGN_T /* Type whose alignment is supported in every context and is at least as great as that of any standard type not using alignment specifiers. */ typedef struct { long long __max_align_ll __attribute__((__aligned__(__alignof__(long long)))); long double __max_align_ld __attribute__((__aligned__(__alignof__(long double)))); } max_align_t; #endif #endif /* C11 or C++11. */ #if defined(__cplusplus) && __cplusplus >= 201103L #ifndef _GXX_NULLPTR_T #define _GXX_NULLPTR_T typedef decltype(nullptr) nullptr_t; #endif #endif /* C++11. */ #endif /* _STDDEF_H was defined this time */ #endif /* !_STDDEF_H && !_STDDEF_H_ && !_ANSI_STDDEF_H && !__STDDEF_H__ || __need_XXX was not defined before */