stddef.h File Reference

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Macros
#define	NULL   ((void *) 0)
#define	offsetof(type, field)   ((size_t) (&((type *) 0)->field))
#define	container_of(ptr, type, member)
#define	likely(expr)   (!!(expr))
#define	unlikely(expr)   (!!(expr))
#define	min(a, b)
#define	max(a, b)
#define	clamp(v, a, b)   min(max(a, v), b)
#define	ifloor(x)   ((x) > 0 ? (int) (x) : (int) ((x) -0.9999999999))
#define	iround(x)   ((x) > 0 ? (int) ((x) + 0.5) : (int) ((x) -0.5))
#define	iceil(x)   ((x) > 0 ? (int) ((x) + 0.9999999999) : (int) (x))
#define	idiv255(x)   ((((int) (x) + 1) * 257) >> 16)
#define	X(...)   ("" #__VA_ARGS__ "")

Enumerations
enum	{ FALSE = 0 , TRUE = 1 }

Macro Definition Documentation

clamp

#define clamp	(		v,
			a,
			b
	)		min(max(a, v), b)

container_of

#define container_of	(		ptr,
			type,
			member
	)

Value:

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

iceil

#define iceil

(

x

)

((x) > 0 ? (int) ((x) + 0.9999999999) : (int) (x))

idiv255

#define idiv255

(

x

)

((((int) (x) + 1) * 257) >> 16)

ifloor

#define ifloor

(

x

)

((x) > 0 ? (int) (x) : (int) ((x) -0.9999999999))

iround

#define iround

(

x

)

((x) > 0 ? (int) ((x) + 0.5) : (int) ((x) -0.5))

likely

#define likely

(

expr

)

(!!(expr))

max

#define max	(		a,
			b
	)

Value:

    ({                                 \
        typeof(a) _amax = (a);         \
        typeof(b) _bmax = (b);         \
        (void) (&_amax == &_bmax);     \
        _amax > _bmax ? _amax : _bmax; \
    })

min

#define min	(		a,
			b
	)

Value:

    ({                                 \
        typeof(a) _amin = (a);         \
        typeof(b) _bmin = (b);         \
        (void) (&_amin == &_bmin);     \
        _amin < _bmin ? _amin : _bmin; \
    })

NULL

#define NULL   ((void *) 0)

offsetof

#define offsetof	(		type,
			field
	)		((size_t) (&((type *) 0)->field))

unlikely

#define unlikely

(

expr

)

(!!(expr))

X

#define X

(

...

)

("" #__VA_ARGS__ "")

Enumeration Type Documentation

anonymous enum

anonymous enum

Enumerator
FALSE
TRUE