sys/libunicode/internal.h


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#pragma once

#include <u.h>
#include <base.h>
#include <libunicode.h>

#define Bit(i) (7-(i))
/* N 0's preceded by i 1's e.g. T(Bit(2)) is 1100 0000 */
#define Tbyte(i) (((1 << (Bit(i)+1))-1) ^ 0xFF)
/* 0000 0000 0000 0111 1111 1111 */
#define	RuneX(i) ((1 << (Bit(i) + ((i)-1)*Bitx))-1)

enum
{
    Bitx  = Bit(1),
    Tx    = Tbyte(1),
    Rune1 = (1 << (Bit(0)+0*Bitx)) - 1,

    Maskx = (1 << Bitx) - 1, /* 0011 1111 */
    Testx = Maskx ^ 0xff,    /* 1100 0000 */

    SurrogateMin = 0xD800,
    SurrogateMax = 0xDFFF,
    Bad = RuneErr,
};