#ifndef _STDDEF_H
#ifndef _STDDEF_H_
+
+/* 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_
+#endif
#ifndef __sys_stdtypes_h
/* This avoids lossage on Sunos but only if stdtypes.h comes first.
#ifndef __PTRDIFF_TYPE__
#define __PTRDIFF_TYPE__ long int
#endif
+/* 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)
typedef __PTRDIFF_TYPE__ ptrdiff_t;
+#endif /* <stddef.h> or __need_ptrdiff_t. */
#endif /* _GCC_PTRDIFF_T */
#endif /* ___int_ptrdiff_t_h */
#endif /* _PTRDIFF_T_ */
#endif /* _T_PTRDIFF_ */
#endif /* _PTRDIFF_T */
+/* If this symbol has done its job, get rid of it. */
+#undef __need_ptrdiff_t
+
/* Unsigned type of `sizeof' something. */
#ifndef _SIZE_T /* in case <sys/types.h> has defined it. */
#ifndef __SIZE_TYPE__
#define __SIZE_TYPE__ long unsigned int
#endif
+/* 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)
typedef __SIZE_TYPE__ size_t;
+#endif /* <stddef.h> or __need_size_t. */
#endif /* _SIZET_ */
#endif /* _GCC_SIZE_T */
#endif /* ___int_size_t_h */
#endif /* _T_SIZE */
#endif /* _T_SIZE_ */
#endif /* _SIZE_T */
+#undef __need_size_t
-/* Data type for wide chars. */
+
+/* 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. */
#ifndef _WCHAR_T
#ifndef _T_WCHAR_
#ifndef __WCHAR_TYPE__
#define __WCHAR_TYPE__ int
#endif
+/* 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)
typedef __WCHAR_TYPE__ wchar_t;
+#endif /* <stddef.h> or __need_wchar_t. */
#endif
#endif
#endif
#endif
#endif
#endif
+#undef __need_wchat_t
#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_ */
-#endif /* _STDDEF_H */
+#endif /* _STDDEF_H was defined this time */
+#endif /* _STDDEF_H_ was not defined before */
+#endif /* _STDDEF_H was not defined before */