Commit 5a18d07c authored by Ammar Faizi's avatar Ammar Faizi Committed by Paul E. McKenney
Browse files

tools/nolibc/types: Implement `offsetof()` and `container_of()` macro 



Implement `offsetof()` and `container_of()` macro. The first use case
of these macros is for `malloc()`, `realloc()` and `free()`.

Acked-by: default avatarWilly Tarreau <w@1wt.eu>
Signed-off-by: default avatarAmmar Faizi <ammarfaizi2@gnuweeb.org>
Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent 544fa1a2

tools/include/nolibc/types.h

+11 −0
Original line number Diff line number Diff line
@@ -191,4 +191,15 @@ struct stat { 
#define major(dev) ((unsigned int)(((dev) >> 8) & 0xfff))

#define minor(dev) ((unsigned int)(((dev) & 0xff))



#ifndef offsetof

#define offsetof(TYPE, FIELD) ((size_t) &((TYPE *)0)->FIELD)

#endif



#ifndef container_of

#define container_of(PTR, TYPE, FIELD) ({			\

	__typeof__(((TYPE *)0)->FIELD) *__FIELD_PTR = (PTR);	\

	(TYPE *)((char *) __FIELD_PTR - offsetof(TYPE, FIELD));	\

})

#endif



#endif /* _NOLIBC_TYPES_H */