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

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

Acked-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Ammar Faizi <ammarfaizi2@gnuweeb.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Ammar Faizi 2022-03-29 17:17:34 +07:00 committed by Paul E. McKenney
parent 544fa1a2d3
commit 5a18d07ce3
1 changed files with 11 additions and 0 deletions
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11
tools/include/nolibc/types.h
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@ -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 */