arith.h File Reference

Basic arithmetic operations. More...

#include <stddef.h>

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Macros
#define	ST_MAX(x, y)   (((x) > (y)) ? (x) : (y))
	Compute the maximum of two values.
#define	ST_MIN(x, y)   (((x) < (y)) ? (x) : (y))
	Compute the minimum of two values.
#define	st_container_of(ptr, type, member)
	Cast a member of a structure out to the containing structure.

Detailed Description

Basic arithmetic operations.

Macro Definition Documentation

st_container_of

#define st_container_of	(		ptr,
			type,
			member
	)

Value:

        ({                                                                     \
                const __typeof__(((type*)0)->member)* _ptr = (ptr);            \
                                                                               \
                (type*)((char*)_ptr - offsetof(type, member));                 \
        })

Cast a member of a structure out to the containing structure.

Parameters

[in]	ptr	The pointer to the member.
[in]	type	The type of the container struct this is embedded in.
[in]	member	The name of the member within the struct.

Returns

Pointer to the member's container.

Note

Compile with the GNU extension to enable a type check for the ptr.

ST_MAX

#define ST_MAX	(		x,
			y
	)		(((x) > (y)) ? (x) : (y))

Compute the maximum of two values.

This macro returns the maximum of x and y.

Returns

maximum of x and y.

Note

Side effects: x and y evaluated twice.

ST_MIN

#define ST_MIN	(		x,
			y
	)		(((x) < (y)) ? (x) : (y))

Compute the minimum of two values.

This macro returns the minimum of x and y.

Returns

minimum of x and y.

Note

Side effects: x and y evaluated twice.