include/util.h File Reference

Misc utility functions and definitions. More...

#include <compiler.h>
#include <stdint.h>
#include <types.h>

Defines
#define	xstr(s) str(s)
	Stringify the result after expansion of a macro argument.
#define	str(s) #s
	Stringify a macro argument without expansion.
#define	ARRAY_LEN(a) (sizeof(a) / sizeof((a)[0]))
	Get the number of elements in array a.
#define	container_of(ptr, type, member) ((type *)((uintptr_t)(ptr) - offsetof(type, member)))
	Get the containing object.
#define	round_down(x, order)
	Round down to the nearest power of two boundary.
#define	round_up(x, order)
	Round up to the nearest power of two boundary.
#define	div_ceil(a, b) (((a) + (b) - 1) / (b))
	Calculate $\left\lceil \frac{a}{b} \right\rceil$ using integer arithmetic.
Minimum and Maximum

#define	min_s(a, b)
	Get the lowest of two signed values.
#define	min_u(a, b)
	Get the lowest of two unsigned values.
#define	max_s(a, b)
	Get the highest of two signed values.
#define	max_u(a, b)
	Get the highest of two unsigned values.
Functions
static int	isdigit (int c)
	Determine whether or not the character c is a digit.
static int	iscntrl (int c)
	Determine whether or not the character c is a control character.
static int	isspace (int c)
	Determine whether or not the character c is a space.
int_fast8_t	ilog2_undefined (void)
static __always_inline int_fast8_t	ilog2 (uint32_t x)
	Calculate the base-2 logarithm of a number rounded down to the nearest integer.
static __always_inline bool	is_power_of_two (unsigned long x)
	Test if a given value is a power of two.
static unsigned long	word_align (unsigned long x)
	Round up to the nearest word-aligned boundary.

Detailed Description

Misc utility functions and definitions.

Definition in file util.h.