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new utf decoder

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This patch replaces current utf decoder with a new one, which is ~50
lines shorter and should be easier to understand. Parsing 5 and 6
sequences, if necessary, requires trivial modification of UTF_SIZ
constant and utfbyte, utfmask, utfmin, utfmax arrays.
This commit is contained in:
Damian Okrasa 2014-03-25 20:20:26 +01:00 committed by Roberto E. Vargas Caballero
parent 71328cbcdc
commit 45b808b88e
1 changed files with 81 additions and 133 deletions
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214
st.c
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@ -55,6 +55,7 @@ char *argv0;
#define XEMBED_FOCUS_OUT 5 #define XEMBED_FOCUS_OUT 5
/* Arbitrary sizes */ /* Arbitrary sizes */
#define UTF_INVALID 0xFFFD
#define UTF_SIZ 4 #define UTF_SIZ 4
#define ESC_BUF_SIZ (128*UTF_SIZ) #define ESC_BUF_SIZ (128*UTF_SIZ)
#define ESC_ARG_SIZ 16 #define ESC_ARG_SIZ 16
@ -442,10 +443,12 @@ static void selcopy(void);
static void selscroll(int, int); static void selscroll(int, int);
static void selsnap(int, int *, int *, int); static void selsnap(int, int *, int *, int);
static int utf8decode(char *, long *); static size_t utf8decode(char *, long *, size_t);
static int utf8encode(long *, char *); static long utf8decodebyte(char, size_t *);
static int utf8size(char *); static size_t utf8encode(long, char *, size_t);
static int isfullutf8(char *, int); static char utf8encodebyte(long, size_t);
static size_t utf8len(char *);
static size_t utf8validate(long *, size_t);
static ssize_t xwrite(int, char *, size_t); static ssize_t xwrite(int, char *, size_t);
static void *xmalloc(size_t); static void *xmalloc(size_t);
@ -490,6 +493,11 @@ static int oldbutton = 3; /* button event on startup: 3 = release */
static char *usedfont = NULL; static char *usedfont = NULL;
static double usedfontsize = 0; static double usedfontsize = 0;
static uchar utfbyte[UTF_SIZ + 1] = {0x80, 0, 0xC0, 0xE0, 0xF0};
static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
static long utfmin[UTF_SIZ + 1] = { 0, 0, 0x80, 0x800, 0x10000};
static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
/* Font Ring Cache */ /* Font Ring Cache */
enum { enum {
FRC_NORMAL, FRC_NORMAL,
@ -549,128 +557,69 @@ xstrdup(char *s) {
return p; return p;
} }
int size_t
utf8decode(char *s, long *u) { utf8decode(char *c, long *u, size_t clen) {
uchar c; size_t i, j, len, type;
int i, n, rtn; long udecoded;
rtn = 1; *u = UTF_INVALID;
c = *s; if(!clen)
if(~c & 0x80) { /* 0xxxxxxx */ return 0;
*u = c; udecoded = utf8decodebyte(c[0], &len);
return rtn; if(!BETWEEN(len, 1, UTF_SIZ))
} else if((c & 0xE0) == 0xC0) { /* 110xxxxx */ return 1;
*u = c & 0x1F; for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
n = 1; udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
} else if((c & 0xF0) == 0xE0) { /* 1110xxxx */ if(type != 0)
*u = c & 0x0F; return j;
n = 2;
} else if((c & 0xF8) == 0xF0) { /* 11110xxx */
*u = c & 0x07;
n = 3;
} else {
goto invalid;
} }
if(j < len)
for(i = n, ++s; i > 0; --i, ++rtn, ++s) { return 0;
c = *s; *u = udecoded;
if((c & 0xC0) != 0x80) /* 10xxxxxx */ utf8validate(u, len);
goto invalid; return len;
*u <<= 6;
*u |= c & 0x3F;
}
if((n == 1 && *u < 0x80) ||
(n == 2 && *u < 0x800) ||
(n == 3 && *u < 0x10000) ||
(*u >= 0xD800 && *u <= 0xDFFF)) {
goto invalid;
}
return rtn;
invalid:
*u = 0xFFFD;
return rtn;
} }
int long
utf8encode(long *u, char *s) { utf8decodebyte(char c, size_t *i) {
uchar *sp; for(*i = 0; *i < LEN(utfmask); ++(*i))
ulong uc; if(((uchar)c & utfmask[*i]) == utfbyte[*i])
int i, n; return (uchar)c & ~utfmask[*i];
return 0;
sp = (uchar *)s;
uc = *u;
if(uc < 0x80) {
*sp = uc; /* 0xxxxxxx */
return 1;
} else if(*u < 0x800) {
*sp = (uc >> 6) | 0xC0; /* 110xxxxx */
n = 1;
} else if(uc < 0x10000) {
*sp = (uc >> 12) | 0xE0; /* 1110xxxx */
n = 2;
} else if(uc <= 0x10FFFF) {
*sp = (uc >> 18) | 0xF0; /* 11110xxx */
n = 3;
} else {
goto invalid;
}
for(i=n,++sp; i>0; --i,++sp)
*sp = ((uc >> 6*(i-1)) & 0x3F) | 0x80; /* 10xxxxxx */
return n+1;
invalid:
/* U+FFFD */
*s++ = '\xEF';
*s++ = '\xBF';
*s = '\xBD';
return 3;
} }
/* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode size_t
UTF-8 otherwise return 0 */ utf8encode(long u, char *c, size_t clen) {
int size_t len, i;
isfullutf8(char *s, int b) {
uchar *c1, *c2, *c3;
c1 = (uchar *)s; len = utf8validate(&u, 0);
c2 = (uchar *)++s; if(clen < len)
c3 = (uchar *)++s;
if(b < 1) {
return 0; return 0;
} else if((*c1 & 0xE0) == 0xC0 && b == 1) { for(i = len - 1; i != 0; --i) {
return 0; c[i] = utf8encodebyte(u, 0);
} else if((*c1 & 0xF0) == 0xE0 && u >>= 6;
((b == 1) ||
((b == 2) && (*c2 & 0xC0) == 0x80))) {
return 0;
} else if((*c1 & 0xF8) == 0xF0 &&
((b == 1) ||
((b == 2) && (*c2 & 0xC0) == 0x80) ||
((b == 3) && (*c2 & 0xC0) == 0x80 && (*c3 & 0xC0) == 0x80))) {
return 0;
} else {
return 1;
} }
c[0] = utf8encodebyte(u, len);
return len;
} }
int char
utf8size(char *s) { utf8encodebyte(long u, size_t i) {
uchar c = *s; return utfbyte[i] | (u & ~utfmask[i]);
}
if(~c & 0x80) { size_t
return 1; utf8len(char *c) {
} else if((c & 0xE0) == 0xC0) { return utf8decode(c, &(long){0}, UTF_SIZ);
return 2; }
} else if((c & 0xF0) == 0xE0) {
return 3; size_t
} else { utf8validate(long *u, size_t i) {
return 4; if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
} *u = UTF_INVALID;
for(i = 1; *u > utfmax[i]; ++i)
;
return i;
} }
static void static void
@ -984,7 +933,7 @@ getsel(void) {
if(!selected(x, y) || (gp->mode & ATTR_WDUMMY)) if(!selected(x, y) || (gp->mode & ATTR_WDUMMY))
continue; continue;
size = utf8size(gp->c); size = utf8len(gp->c);
memcpy(ptr, gp->c, size); memcpy(ptr, gp->c, size);
ptr += size; ptr += size;
} }
@ -1298,7 +1247,7 @@ ttyread(void) {
char *ptr; char *ptr;
char s[UTF_SIZ]; char s[UTF_SIZ];
int charsize; /* size of utf8 char in bytes */ int charsize; /* size of utf8 char in bytes */
long utf8c; long unicodep;
int ret; int ret;
/* append read bytes to unprocessed bytes */ /* append read bytes to unprocessed bytes */
@ -1308,9 +1257,8 @@ ttyread(void) {
/* process every complete utf8 char */ /* process every complete utf8 char */
buflen += ret; buflen += ret;
ptr = buf; ptr = buf;
while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) { while(charsize = utf8decode(ptr, &unicodep, buflen)) {
charsize = utf8decode(ptr, &utf8c); utf8encode(unicodep, s, UTF_SIZ);
utf8encode(&utf8c, s);
tputc(s, charsize); tputc(s, charsize);
ptr += charsize; ptr += charsize;
buflen -= charsize; buflen -= charsize;
@ -2414,14 +2362,14 @@ void
tputc(char *c, int len) { tputc(char *c, int len) {
uchar ascii = *c; uchar ascii = *c;
bool control = ascii < '\x20' || ascii == 0177; bool control = ascii < '\x20' || ascii == 0177;
long u8char; long unicodep;
int width; int width;
if(len == 1) { if(len == 1) {
width = 1; width = 1;
} else { } else {
utf8decode(c, &u8char); utf8decode(c, &unicodep, UTF_SIZ);
width = wcwidth(u8char); width = wcwidth(unicodep);
} }
if(IS_SET(MODE_PRINT)) if(IS_SET(MODE_PRINT))
@ -3150,7 +3098,7 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
int frcflags; int frcflags;
int u8fl, u8fblen, u8cblen, doesexist; int u8fl, u8fblen, u8cblen, doesexist;
char *u8c, *u8fs; char *u8c, *u8fs;
long u8char; long unicodep;
Font *font = &dc.font; Font *font = &dc.font;
FcResult fcres; FcResult fcres;
FcPattern *fcpattern, *fontpattern; FcPattern *fcpattern, *fontpattern;
@ -3293,11 +3241,11 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
oneatatime = font->width != xw.cw; oneatatime = font->width != xw.cw;
for(;;) { for(;;) {
u8c = s; u8c = s;
u8cblen = utf8decode(s, &u8char); u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
s += u8cblen; s += u8cblen;
bytelen -= u8cblen; bytelen -= u8cblen;
doesexist = XftCharExists(xw.dpy, font->match, u8char); doesexist = XftCharExists(xw.dpy, font->match, unicodep);
if(oneatatime || !doesexist || bytelen <= 0) { if(oneatatime || !doesexist || bytelen <= 0) {
if(oneatatime || bytelen <= 0) { if(oneatatime || bytelen <= 0) {
if(doesexist) { if(doesexist) {
@ -3329,7 +3277,7 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
/* Search the font cache. */ /* Search the font cache. */
for(i = 0; i < frclen; i++) { for(i = 0; i < frclen; i++) {
if(XftCharExists(xw.dpy, frc[i].font, u8char) if(XftCharExists(xw.dpy, frc[i].font, unicodep)
&& frc[i].flags == frcflags) { && frc[i].flags == frcflags) {
break; break;
} }
@ -3351,7 +3299,7 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
fcpattern = FcPatternDuplicate(font->pattern); fcpattern = FcPatternDuplicate(font->pattern);
fccharset = FcCharSetCreate(); fccharset = FcCharSetCreate();
FcCharSetAddChar(fccharset, u8char); FcCharSetAddChar(fccharset, unicodep);
FcPatternAddCharSet(fcpattern, FC_CHARSET, FcPatternAddCharSet(fcpattern, FC_CHARSET,
fccharset); fccharset);
FcPatternAddBool(fcpattern, FC_SCALABLE, FcPatternAddBool(fcpattern, FC_SCALABLE,
@ -3387,7 +3335,7 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
xp, winy + frc[i].font->ascent, xp, winy + frc[i].font->ascent,
(FcChar8 *)u8c, u8cblen); (FcChar8 *)u8c, u8cblen);
xp += xw.cw * wcwidth(u8char); xp += xw.cw * wcwidth(unicodep);
} }
/* /*
@ -3430,7 +3378,7 @@ xdrawcursor(void) {
memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ); memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
/* remove the old cursor */ /* remove the old cursor */
sl = utf8size(term.line[oldy][oldx].c); sl = utf8len(term.line[oldy][oldx].c);
width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1; width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
oldy, width, sl); oldy, width, sl);
@ -3444,7 +3392,7 @@ xdrawcursor(void) {
g.bg = defaultfg; g.bg = defaultfg;
} }
sl = utf8size(g.c); sl = utf8len(g.c);
width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\ width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
? 2 : 1; ? 2 : 1;
xdraws(g.c, g, term.c.x, term.c.y, width, sl); xdraws(g.c, g, term.c.x, term.c.y, width, sl);
@ -3516,7 +3464,7 @@ drawregion(int x1, int y1, int x2, int y2) {
Glyph base, new; Glyph base, new;
char buf[DRAW_BUF_SIZ]; char buf[DRAW_BUF_SIZ];
bool ena_sel = sel.ob.x != -1; bool ena_sel = sel.ob.x != -1;
long u8char; long unicodep;
if(sel.alt ^ IS_SET(MODE_ALTSCREEN)) if(sel.alt ^ IS_SET(MODE_ALTSCREEN))
ena_sel = 0; ena_sel = 0;
@ -3548,7 +3496,7 @@ drawregion(int x1, int y1, int x2, int y2) {
base = new; base = new;
} }
sl = utf8decode(new.c, &u8char); sl = utf8decode(new.c, &unicodep, UTF_SIZ);
memcpy(buf+ib, new.c, sl); memcpy(buf+ib, new.c, sl);
ib += sl; ib += sl;
ic += (new.mode & ATTR_WIDE)? 2 : 1; ic += (new.mode & ATTR_WIDE)? 2 : 1;
@ -3707,7 +3655,7 @@ kpress(XEvent *ev) {
if(IS_SET(MODE_8BIT)) { if(IS_SET(MODE_8BIT)) {
if(*buf < 0177) { if(*buf < 0177) {
c = *buf | 0x80; c = *buf | 0x80;
len = utf8encode(&c, buf); len = utf8encode(c, buf, UTF_SIZ);
} }
} else { } else {
buf[1] = buf[0]; buf[1] = buf[0];