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gstddef.h
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1994-02-06
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#ifndef _STDDEF_H
#ifndef _STDDEF_H_
#ifndef _ANSI_STDDEF_H
#ifdef amigados
/* GNU libc has special support in this file, 4.3bsd-net2 libc deserves that
just as well. The system headers are ANSI compliant, the used compiler IS
gcc, so it's really ok to use the system header, no reason to hassle
with a jungle of ifdefs. Besides, amigados is only defined if compiling
with host=amigados, it doesn't apply if compiling with target=amigados
on a different host with possibly different system headers. Same thing
would apply to gstdarg.h and gvarargs.h, but those headers are more
easily fixable than this one and I'm sick of writing the same comment
there as well. MW
Include the contents of <stddef.h> inline rather than with a #include,
to avoid infinite include recursion when this file is installed in
gcc's include directory as stddef.h. (fnf) */
#define _STDDEF_H_
#include <machine/ansi.h>
typedef _PTRDIFF_T_ ptrdiff_t;
#ifdef _SIZE_T_
typedef _SIZE_T_ size_t;
#undef _SIZE_T_
#endif
#ifdef _WCHAR_T_
typedef _WCHAR_T_ wchar_t;
#undef _WCHAR_T_
#endif
#ifndef NULL
#define NULL 0
#endif
#define offsetof(type, member) ((size_t)(&((type *)0)->member))
#else /* not amigados */
/* 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))
#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____)
#include <machine/ansi.h>
#endif
/* In 4.3bsd-net2, machine/ansi.h defines these symbols, which are
defined if the corresponding type is *not* defined. */
#ifdef _ANSI_H_
#ifndef _SIZE_T_
#define _SIZE_T
#endif
#ifndef _PTRDIFF_T_
#define _PTRDIFF_T
#endif
#ifndef _WCHAR_T_
#define _WCHAR_T
#endif
#undef _PTRDIFF_T_
#ifndef __need_ptrdiff_t
#undef _SIZE_T_
#undef _WCHAR_T_
#endif
#endif /* _ANSI_H_ */
/* 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 ___int_ptrdiff_t_h
#ifndef _GCC_PTRDIFF_T
#define _PTRDIFF_T
#define _T_PTRDIFF_
#define _T_PTRDIFF
#define __PTRDIFF_T
#define _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 /* _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 /* in case <sys/types.h> has defined it. */
#ifndef _T_SIZE_
#ifndef _T_SIZE
#ifndef __SIZE_T
#ifndef _SIZE_T_
#ifndef ___int_size_t_h
#ifndef _GCC_SIZE_T
#ifndef _SIZET_
#define _SIZE_T
#define _T_SIZE_
#define _T_SIZE
#define __SIZE_T
#define _SIZE_T_
#define ___int_size_t_h
#define _GCC_SIZE_T
#define _SIZET_
#ifndef __SIZE_TYPE__
#define __SIZE_TYPE__ long unsigned int
#endif
typedef __SIZE_TYPE__ size_t;
#endif /* _SIZET_ */
#endif /* _GCC_SIZE_T */
#endif /* ___int_size_t_h */
#endif /* _SIZE_T_ */
#endif /* __SIZE_T */
#endif /* _T_SIZE */
#endif /* _T_SIZE_ */
#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
#ifndef _T_WCHAR_
#ifndef _T_WCHAR
#ifndef __WCHAR_T
#ifndef _WCHAR_T_
#ifndef ___int_wchar_t_h
#ifndef _GCC_WCHAR_T
#define _WCHAR_T
#define _T_WCHAR_
#define _T_WCHAR
#define __WCHAR_T
#define _WCHAR_T_
#define ___int_wchar_t_h
#define _GCC_WCHAR_T
#ifndef __WCHAR_TYPE__
#define __WCHAR_TYPE__ int
#endif
#endif /* not amigados */
#ifdef __GNUG__
/* In C++, wchar_t is a distinct basic type,
and we can expect __wchar_t to be defined by cc1plus. */
typedef __wchar_t wchar_t;
#else
/* In C, cpp tells us which type to make an alias for. */
typedef __WCHAR_TYPE__ wchar_t;
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#endif
#undef __need_wchar_t
#endif /* _STDDEF_H or __need_wchar_t. */
/* In 4.3bsd-net2, leave these undefined to indicate that size_t, etc.
are already defined. We need not worry about the case of wanting just
one of these types, not on 4.3bsd-net2, because only the GNU libc
header files do that. */
#ifdef _ANSI_H_
#undef _PTRDIFF_T_
#ifdef _STDDEF_H /* This is a kludge.
_STDDEF_H is defined when we are using the whole file,
undefined when obstack.h wants just ptrdiff_t. */
#undef _SIZE_T_
#undef _WCHAR_T_
#endif
#endif
#endif /* __sys_stdtypes_h */
/* A null pointer constant. */
#if defined (_STDDEF_H) || defined (__need_NULL)
#undef NULL /* in case <stdio.h> has defined it. */
#define NULL ((void *)0)
#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) ((size_t) &((TYPE *)0)->MEMBER)
#endif /* _STDDEF_H was defined this time */
#endif /* _ANSI_STDDEF_H was not defined before */
#endif /* _STDDEF_H_ was not defined before */
#endif /* _STDDEF_H was not defined before */