utils.h File Reference

Misc utilities functions and macros. More...

Go to the source code of this file.

Macros
#define	SWAP(a, b)   ({ typeof(a) t = a; a = b; b = t; })
	Swap two values.
#define	MAX(a, b)   ({ typeof(a) _a = a; typeof(b) _b = b; _a > _b ? _a : _b; })
	Return the maximum of two values.
#define	MIN(a, b)   ({ typeof(a) _a = a; typeof(b) _b = b; _a < _b ? _a : _b; })
	Return the minimum of two values.
#define	CLAMP(x, min, max)   (MIN(MAX((x), (min)), (max)))
	Clamp a value between min and max.
#define	ROUND_UP(n, d)
	Round n up to the next multiple of d.
#define	ROUND_DOWN(n, d)
	Round n down to the previous multiple of d.
#define	DIVIDE_CEIL(n, d)
	Return the ceil of n/d.
#define	ABS(x)
	Absolute number.
#define	F2I(f)   ({ uint32_t __i; memcpy(&__i, &(f), 4); __i; })
	Type-safe bitcast from float to integer.
#define	I2F(i)   ({ float __f; memcpy(&__f, &(i), 4); __f; })
	Type-safe bitcast from integer to float.
#define	LIKELY(cond)   __builtin_expect(!!(cond), 1)
	Hint for the compiler that the condition is likely to happen.
#define	UNLIKELY(cond)   __builtin_expect(!!(cond), 0)
	Hint for the compiler that the condition is unlikely to happen.

Functions
uint32_t	__utf8_decode (const char **str)
	UTF-8 decoding.

Detailed Description

Misc utilities functions and macros.

Author

Giovanni Bajo giova.nosp@m.nnib.nosp@m.ajo@g.nosp@m.mail.nosp@m..com

Macro Definition Documentation

ROUND_UP

#define ROUND_UP	(		n,
			d
	)

Value:

    ({ \
    typeof(n) _n = n; typeof(d) _d = d; \
    (((_n) + (_d) - 1) / (_d) * (_d)); \
})

Round n up to the next multiple of d.

ROUND_DOWN

#define ROUND_DOWN	(		n,
			d
	)

Value:

    ({ \
    typeof(n) _n = n; typeof(d) _d = d; \
    ((_n >= 0) ? ((_n) / (_d) * (_d)) : -(((-_n + (_d) - 1) / (_d)) * (_d))); \
})

Round n down to the previous multiple of d.

DIVIDE_CEIL

#define DIVIDE_CEIL	(		n,
			d
	)

Value:

    ({ \
    typeof(n) _n = n; typeof(d) _d = d; \
    ((_n) + (_d) - 1) / (_d); \
})

Return the ceil of n/d.

ABS

#define ABS

(

x

)

Value:

    ({ \
    typeof(x) _x = x; \
    (_x < 0 ? -_x : _x); \
})

Absolute number.