diff options
Diffstat (limited to 'lib/birdlib.h')
| -rw-r--r-- | lib/birdlib.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/lib/birdlib.h b/lib/birdlib.h index d743ecdf..5ecd19ca 100644 --- a/lib/birdlib.h +++ b/lib/birdlib.h @@ -9,13 +9,22 @@ #ifndef _BIRD_BIRDLIB_H_ #define _BIRD_BIRDLIB_H_ +#include <stddef.h> + #include "sysdep/config.h" #include "lib/alloca.h" /* Ugly structure offset handling macros */ #define SAME_TYPE(a, b) ({ int _ = ((a) != (b)); !_; }) +#define TYPE_CAST(from, to, what) ( SAME_TYPE(((from) NULL), (what)), ((to) (what))) + +#ifdef offsetof +#define OFFSETOF offsetof +#else #define OFFSETOF(s, i) ((size_t) &((s *)0)->i) +#endif + #define SKIP_BACK(s, i, p) ({ s *_ptr = ((s *)((char *)p - OFFSETOF(s, i))); SAME_TYPE(&_ptr->i, p); _ptr; }) #define BIRD_ALIGN(s, a) (((s)+a-1)&~(a-1)) #define CPU_STRUCT_ALIGN (MAX_(_Alignof(void*), _Alignof(u64))) |