mirror of
https://github.com/0intro/conterm
synced 2024-11-21 21:31:23 +03:00
libc: import 21-bit runes from Plan 9
R=rsc https://codereview.appspot.com/9035046
This commit is contained in:
David du Colombier
parent
2f4516ba69
commit
3dbe2c359f
@ -3,6 +3,9 @@
|
||||
#define listen pm_listen
|
||||
#define sleep ksleep
|
||||
#define wakeup kwakeup
|
||||
#ifdef strtod
|
||||
#undef strtod
|
||||
#endif
|
||||
#define strtod fmtstrtod
|
||||
|
||||
/* conflicts on some os's */
|
||||
@ -27,7 +30,7 @@ typedef unsigned int p9_ulong;
|
||||
typedef int p9_long;
|
||||
typedef signed char p9_schar;
|
||||
typedef unsigned short p9_ushort;
|
||||
typedef unsigned short Rune;
|
||||
typedef unsigned int Rune;
|
||||
typedef unsigned int p9_u32int;
|
||||
typedef p9_u32int mpdigit;
|
||||
|
||||
@ -50,10 +53,12 @@ typedef p9_u32int mpdigit;
|
||||
|
||||
enum
|
||||
{
|
||||
UTFmax = 3, /* maximum bytes per rune */
|
||||
UTFmax = 4, /* maximum bytes per rune */
|
||||
Runesync = 0x80, /* cannot represent part of a UTF sequence (<) */
|
||||
Runeself = 0x80, /* rune and UTF sequences are the same (<) */
|
||||
Runeerror = 0x80 /* decoding error in UTF */
|
||||
Runeerror = 0xFFFD, /* decoding error in UTF */
|
||||
Runemax = 0x10FFFF, /* 21-bit rune */
|
||||
Runemask = 0x1FFFFF, /* bits used by runes (see grep) */
|
||||
};
|
||||
|
||||
/*
|
||||
|
||||
156
libc/rune.c
156
libc/rune.c
@ -1,76 +1,67 @@
|
||||
#include <u.h>
|
||||
#include <libc.h>
|
||||
|
||||
#define Bit(i) (7-(i))
|
||||
/* N 0's preceded by i 1's, T(Bit(2)) is 1100 0000 */
|
||||
#define T(i) (((1 << (Bit(i)+1))-1) ^ 0xFF)
|
||||
/* 0000 0000 0000 0111 1111 1111 */
|
||||
#define RuneX(i) ((1 << (Bit(i) + ((i)-1)*Bitx))-1)
|
||||
|
||||
enum
|
||||
{
|
||||
Bit1 = 7,
|
||||
Bitx = 6,
|
||||
Bit2 = 5,
|
||||
Bit3 = 4,
|
||||
Bit4 = 3,
|
||||
Bitx = Bit(1),
|
||||
|
||||
T1 = ((1<<(Bit1+1))-1) ^ 0xFF, /* 0000 0000 */
|
||||
Tx = ((1<<(Bitx+1))-1) ^ 0xFF, /* 1000 0000 */
|
||||
T2 = ((1<<(Bit2+1))-1) ^ 0xFF, /* 1100 0000 */
|
||||
T3 = ((1<<(Bit3+1))-1) ^ 0xFF, /* 1110 0000 */
|
||||
T4 = ((1<<(Bit4+1))-1) ^ 0xFF, /* 1111 0000 */
|
||||
|
||||
Rune1 = (1<<(Bit1+0*Bitx))-1, /* 0000 0000 0111 1111 */
|
||||
Rune2 = (1<<(Bit2+1*Bitx))-1, /* 0000 0111 1111 1111 */
|
||||
Rune3 = (1<<(Bit3+2*Bitx))-1, /* 1111 1111 1111 1111 */
|
||||
Tx = T(1), /* 1000 0000 */
|
||||
Rune1 = (1<<(Bit(0)+0*Bitx))-1, /* 0000 0000 0000 0000 0111 1111 */
|
||||
|
||||
Maskx = (1<<Bitx)-1, /* 0011 1111 */
|
||||
Testx = Maskx ^ 0xFF, /* 1100 0000 */
|
||||
|
||||
SurrogateMin = 0xD800,
|
||||
SurrogateMax = 0xDFFF,
|
||||
|
||||
Bad = Runeerror,
|
||||
};
|
||||
|
||||
int
|
||||
chartorune(Rune *rune, char *str)
|
||||
{
|
||||
int c, c1, c2;
|
||||
long l;
|
||||
int c[UTFmax], i;
|
||||
Rune l;
|
||||
|
||||
/*
|
||||
* one character sequence
|
||||
* N character sequence
|
||||
* 00000-0007F => T1
|
||||
* 00080-007FF => T2 Tx
|
||||
* 00800-0FFFF => T3 Tx Tx
|
||||
* 10000-10FFFF => T4 Tx Tx Tx
|
||||
*/
|
||||
c = *(uchar*)str;
|
||||
if(c < Tx) {
|
||||
*rune = c;
|
||||
|
||||
c[0] = *(uchar*)(str);
|
||||
if(c[0] < Tx){
|
||||
*rune = c[0];
|
||||
return 1;
|
||||
}
|
||||
l = c[0];
|
||||
|
||||
/*
|
||||
* two character sequence
|
||||
* 0080-07FF => T2 Tx
|
||||
*/
|
||||
c1 = *(uchar*)(str+1) ^ Tx;
|
||||
if(c1 & Testx)
|
||||
for(i = 1; i < UTFmax; i++) {
|
||||
c[i] = *(uchar*)(str+i);
|
||||
c[i] ^= Tx;
|
||||
if(c[i] & Testx)
|
||||
goto bad;
|
||||
if(c < T3) {
|
||||
if(c < T2)
|
||||
l = (l << Bitx) | c[i];
|
||||
if(c[0] < T(i + 2)) {
|
||||
l &= RuneX(i + 1);
|
||||
if(i == 1) {
|
||||
if(c[0] < T(2) || l <= Rune1)
|
||||
goto bad;
|
||||
l = ((c << Bitx) | c1) & Rune2;
|
||||
if(l <= Rune1)
|
||||
} else if(l <= RuneX(i) || l > Runemax)
|
||||
goto bad;
|
||||
if (i == 2 && SurrogateMin <= l && l <= SurrogateMax)
|
||||
goto bad;
|
||||
*rune = l;
|
||||
return 2;
|
||||
return i + 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* three character sequence
|
||||
* 0800-FFFF => T3 Tx Tx
|
||||
*/
|
||||
c2 = *(uchar*)(str+2) ^ Tx;
|
||||
if(c2 & Testx)
|
||||
goto bad;
|
||||
if(c < T4) {
|
||||
l = ((((c << Bitx) | c1) << Bitx) | c2) & Rune3;
|
||||
if(l <= Rune2)
|
||||
goto bad;
|
||||
*rune = l;
|
||||
return 3;
|
||||
}
|
||||
|
||||
/*
|
||||
@ -84,12 +75,9 @@ bad:
|
||||
int
|
||||
runetochar(char *str, Rune *rune)
|
||||
{
|
||||
long c;
|
||||
int i, j;
|
||||
Rune c;
|
||||
|
||||
/*
|
||||
* one character sequence
|
||||
* 00000-0007F => 00-7F
|
||||
*/
|
||||
c = *rune;
|
||||
if(c <= Rune1) {
|
||||
str[0] = c;
|
||||
@ -97,23 +85,35 @@ runetochar(char *str, Rune *rune)
|
||||
}
|
||||
|
||||
/*
|
||||
* one character sequence
|
||||
* 00000-0007F => 00-7F
|
||||
* two character sequence
|
||||
* 0080-07FF => T2 Tx
|
||||
*/
|
||||
if(c <= Rune2) {
|
||||
str[0] = T2 | (c >> 1*Bitx);
|
||||
str[1] = Tx | (c & Maskx);
|
||||
return 2;
|
||||
}
|
||||
|
||||
/*
|
||||
* three character sequence
|
||||
* 0800-FFFF => T3 Tx Tx
|
||||
* four character sequence (21-bit value)
|
||||
* 10000-1FFFFF => T4 Tx Tx Tx
|
||||
* If the Rune is out of range or a surrogate half,
|
||||
* convert it to the error rune.
|
||||
* Do this test when i==3 because the error rune encodes to three bytes.
|
||||
* Doing it earlier would duplicate work, since an out of range
|
||||
* Rune wouldn't have fit in one or two bytes.
|
||||
*/
|
||||
str[0] = T3 | (c >> 2*Bitx);
|
||||
str[1] = Tx | ((c >> 1*Bitx) & Maskx);
|
||||
str[2] = Tx | (c & Maskx);
|
||||
return 3;
|
||||
for(i = 2; i < UTFmax + 1; i++){
|
||||
if(i == 3){
|
||||
if(c > Runemax)
|
||||
c = Runeerror;
|
||||
if(SurrogateMin <= c && c <= SurrogateMax)
|
||||
c = Runeerror;
|
||||
}
|
||||
if (c <= RuneX(i) || i == UTFmax ) {
|
||||
str[0] = T(i) | (c >> (i - 1)*Bitx);
|
||||
for(j = 1; j < i; j++)
|
||||
str[j] = Tx | ((c >> (i - j - 1)*Bitx) & Maskx);
|
||||
return i;
|
||||
}
|
||||
}
|
||||
return UTFmax;
|
||||
}
|
||||
|
||||
int
|
||||
@ -129,18 +129,21 @@ runelen(long c)
|
||||
int
|
||||
runenlen(Rune *r, int nrune)
|
||||
{
|
||||
int nb, c;
|
||||
int nb, i;
|
||||
Rune c;
|
||||
|
||||
nb = 0;
|
||||
while(nrune--) {
|
||||
c = *r++;
|
||||
if(c <= Rune1)
|
||||
if(c <= Rune1){
|
||||
nb++;
|
||||
else
|
||||
if(c <= Rune2)
|
||||
nb += 2;
|
||||
else
|
||||
nb += 3;
|
||||
} else {
|
||||
for(i = 2; i < UTFmax + 1; i++)
|
||||
if(c <= RuneX(i) || i == UTFmax){
|
||||
nb += i;
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
return nb;
|
||||
}
|
||||
@ -148,15 +151,16 @@ runenlen(Rune *r, int nrune)
|
||||
int
|
||||
fullrune(char *str, int n)
|
||||
{
|
||||
int c;
|
||||
int i;
|
||||
Rune c;
|
||||
|
||||
if(n > 0) {
|
||||
if(n <= 0)
|
||||
return 0;
|
||||
c = *(uchar*)str;
|
||||
if(c < Tx)
|
||||
return 1;
|
||||
if(n > 1)
|
||||
if(c < T3 || n > 2)
|
||||
return 1;
|
||||
}
|
||||
return 0;
|
||||
for(i = 3; i < UTFmax + 1; i++)
|
||||
if(c < T(i))
|
||||
return n >= i - 1;
|
||||
return n >= UTFmax;
|
||||
}
|
||||
|
||||
@ -1,14 +1,16 @@
|
||||
#ifndef _UTFH_
|
||||
#define _UTFH_ 1
|
||||
|
||||
typedef unsigned short Rune; /* 16 bits */
|
||||
typedef unsigned int Rune; /* 32 bits */
|
||||
|
||||
enum
|
||||
{
|
||||
UTFmax = 3, /* maximum bytes per rune */
|
||||
UTFmax = 4, /* maximum bytes per rune */
|
||||
Runesync = 0x80, /* cannot represent part of a UTF sequence (<) */
|
||||
Runeself = 0x80, /* rune and UTF sequences are the same (<) */
|
||||
Runeerror = 0x80, /* decoding error in UTF */
|
||||
Runeerror = 0xFFFD, /* decoding error in UTF */
|
||||
Runemax = 0x10FFFF, /* 21-bit rune */
|
||||
Runemask = 0x1FFFFF, /* bits used by runes (see grep) */
|
||||
};
|
||||
|
||||
/*
|
||||
|
||||
Loading…
Reference in New Issue
Block a user