| 1 | #ifndef _STDDEF_H |
| 2 | #define _STDDEF_H |
| 3 | |
| 4 | /* Signed type of difference of two pointers. */ |
| 5 | |
| 6 | typedef long ptrdiff_t; |
| 7 | |
| 8 | /* Unsigned type of `sizeof' something. */ |
| 9 | |
| 10 | /* in case <sys/types.h> has defined it. */ |
| 11 | /* DECstation uses _SIZE_T_. */ |
| 12 | #if !defined (_SIZE_T) && !defined (_SIZE_T_) |
| 13 | #define _SIZE_T |
| 14 | typedef unsigned long size_t; |
| 15 | #endif /* _SIZE_T */ |
| 16 | |
| 17 | /* A null pointer constant. */ |
| 18 | |
| 19 | #undef NULL /* in case <stdio.h> has defined it. */ |
| 20 | #define NULL 0 |
| 21 | |
| 22 | /* Offset of member MEMBER in a struct of type TYPE. */ |
| 23 | |
| 24 | #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) |
| 25 | |
| 26 | #endif /* _STDDEF_H */ |