util.h

 
#pragma once
 
#include <stddef.h>
 
#define LOG2(x)     (31 - __builtin_clz((uint32_t) x))
 
#define LENGTH(obj) (sizeof(obj)/sizeof(obj[0]))
 
#define CONTAINER_OF(ptr, type, member) ({\
        const typeof(((type *) 0)->member) * member_ptr = (ptr);\
        (type *) ((char *) member_ptr - offsetof(type, member));\
})