#ifndef UCORE_UTILS_H_
#define UCORE_UTILS_H_
#include <stddef.h>

//Gnerate a compiler error if the compile time
//constant expression fails
#define STATIC_ASSERT(expr) \
    do { \
        enum { assert_static__ = 1/(expr) }; \
    } while (0)

#ifdef DEBUG
    #define TRACEF(fmt, ...)\
    do { \
        fprintf(stderr, "%s:%s(%d)" fmt, __FILE__, __FUNCTION__, __LINE,__VA_ARGS__);\
    } while(0)
#else
    #define TRACEF(fmt, ...)
#endif

//MAX of a and b
#define UC_MAX(a,b) \
   ({ __typeof__ (a) _a = (a); \
       __typeof__ (b) _b = (b); \
     _a > _b ? _a : _b; })

//min of a and b
#define UC_MIN(a,b) \
   ({ __typeof__ (a) _a = (a); \
       __typeof__ (b) _b = (b); \
     _a < _b ? _a : _b; })

#define ARRAY_SIZE(a) (sizeof(a) / sizeof(*a))

//given 'ptr' as a pointer to a struct 'member',
//find the struct that ptr is the member of, where
//'type' is the type of the containing struct
//e.g.
//struct foo {
//   int i;
//   struct bar zap;
//};
// ... 
//struct bar *p = ..; //the local p is a pointer to
//a 'zap' member inside a struct foo.
//give us the struct foo*:
//struct foo *f = CONTAINER_OF(p, struct foo, zap);
#define CONTAINER_OF(ptr, type, member) ({                  \
typeof( ((type *)0)->member ) *__mptr = (ptr);    \
    (type *)( (void *)__mptr - offsetof(type, member) ); })

#define UC_ALIGN(val,align) (((val)+(align)-1UL)&~((align)-1UL))

#endif