mirror of git://git.suckless.org/st
new utf decoder
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
Roberto E. Vargas Caballero
parent
71328cbcdc
commit
45b808b88e
224
st.c
224
st.c
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@ -55,6 +55,7 @@ char *argv0;
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#define XEMBED_FOCUS_OUT 5
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/* Arbitrary sizes */
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#define UTF_INVALID 0xFFFD
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#define UTF_SIZ 4
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#define ESC_BUF_SIZ (128*UTF_SIZ)
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#define ESC_ARG_SIZ 16
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@ -442,10 +443,12 @@ static void selcopy(void);
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static void selscroll(int, int);
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static void selsnap(int, int *, int *, int);
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static int utf8decode(char *, long *);
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static int utf8encode(long *, char *);
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static int utf8size(char *);
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static int isfullutf8(char *, int);
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static size_t utf8decode(char *, long *, size_t);
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static long utf8decodebyte(char, size_t *);
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static size_t utf8encode(long, char *, size_t);
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static char utf8encodebyte(long, size_t);
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static size_t utf8len(char *);
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static size_t utf8validate(long *, size_t);
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static ssize_t xwrite(int, char *, size_t);
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static void *xmalloc(size_t);
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@ -490,6 +493,11 @@ static int oldbutton = 3; /* button event on startup: 3 = release */
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static char *usedfont = NULL;
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static double usedfontsize = 0;
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static uchar utfbyte[UTF_SIZ + 1] = {0x80, 0, 0xC0, 0xE0, 0xF0};
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static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
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static long utfmin[UTF_SIZ + 1] = { 0, 0, 0x80, 0x800, 0x10000};
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static long utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
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/* Font Ring Cache */
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enum {
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FRC_NORMAL,
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@ -549,128 +557,69 @@ xstrdup(char *s) {
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return p;
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}
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int
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utf8decode(char *s, long *u) {
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uchar c;
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int i, n, rtn;
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size_t
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utf8decode(char *c, long *u, size_t clen) {
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size_t i, j, len, type;
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long udecoded;
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rtn = 1;
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c = *s;
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if(~c & 0x80) { /* 0xxxxxxx */
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*u = c;
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return rtn;
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} else if((c & 0xE0) == 0xC0) { /* 110xxxxx */
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*u = c & 0x1F;
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n = 1;
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} else if((c & 0xF0) == 0xE0) { /* 1110xxxx */
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*u = c & 0x0F;
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n = 2;
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} else if((c & 0xF8) == 0xF0) { /* 11110xxx */
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*u = c & 0x07;
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n = 3;
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} else {
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goto invalid;
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}
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for(i = n, ++s; i > 0; --i, ++rtn, ++s) {
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c = *s;
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if((c & 0xC0) != 0x80) /* 10xxxxxx */
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goto invalid;
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*u <<= 6;
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*u |= c & 0x3F;
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}
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if((n == 1 && *u < 0x80) ||
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(n == 2 && *u < 0x800) ||
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(n == 3 && *u < 0x10000) ||
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(*u >= 0xD800 && *u <= 0xDFFF)) {
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goto invalid;
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}
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return rtn;
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invalid:
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*u = 0xFFFD;
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return rtn;
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}
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int
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utf8encode(long *u, char *s) {
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uchar *sp;
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ulong uc;
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int i, n;
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sp = (uchar *)s;
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uc = *u;
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if(uc < 0x80) {
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*sp = uc; /* 0xxxxxxx */
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*u = UTF_INVALID;
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if(!clen)
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return 0;
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udecoded = utf8decodebyte(c[0], &len);
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if(!BETWEEN(len, 1, UTF_SIZ))
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return 1;
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} else if(*u < 0x800) {
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*sp = (uc >> 6) | 0xC0; /* 110xxxxx */
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n = 1;
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} else if(uc < 0x10000) {
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*sp = (uc >> 12) | 0xE0; /* 1110xxxx */
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n = 2;
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} else if(uc <= 0x10FFFF) {
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*sp = (uc >> 18) | 0xF0; /* 11110xxx */
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n = 3;
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} else {
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goto invalid;
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for(i = 1, j = 1; i < clen && j < len; ++i, ++j) {
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udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
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if(type != 0)
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return j;
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}
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for(i=n,++sp; i>0; --i,++sp)
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*sp = ((uc >> 6*(i-1)) & 0x3F) | 0x80; /* 10xxxxxx */
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return n+1;
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invalid:
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/* U+FFFD */
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*s++ = '\xEF';
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*s++ = '\xBF';
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*s = '\xBD';
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return 3;
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}
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/* use this if your buffer is less than UTF_SIZ, it returns 1 if you can decode
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UTF-8 otherwise return 0 */
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int
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isfullutf8(char *s, int b) {
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uchar *c1, *c2, *c3;
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c1 = (uchar *)s;
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c2 = (uchar *)++s;
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c3 = (uchar *)++s;
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if(b < 1) {
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if(j < len)
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return 0;
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} else if((*c1 & 0xE0) == 0xC0 && b == 1) {
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return 0;
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} else if((*c1 & 0xF0) == 0xE0 &&
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((b == 1) ||
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((b == 2) && (*c2 & 0xC0) == 0x80))) {
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return 0;
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} else if((*c1 & 0xF8) == 0xF0 &&
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((b == 1) ||
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((b == 2) && (*c2 & 0xC0) == 0x80) ||
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((b == 3) && (*c2 & 0xC0) == 0x80 && (*c3 & 0xC0) == 0x80))) {
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return 0;
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} else {
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return 1;
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}
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*u = udecoded;
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utf8validate(u, len);
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return len;
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}
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int
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utf8size(char *s) {
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uchar c = *s;
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if(~c & 0x80) {
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return 1;
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} else if((c & 0xE0) == 0xC0) {
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return 2;
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} else if((c & 0xF0) == 0xE0) {
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return 3;
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} else {
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return 4;
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long
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utf8decodebyte(char c, size_t *i) {
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for(*i = 0; *i < LEN(utfmask); ++(*i))
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if(((uchar)c & utfmask[*i]) == utfbyte[*i])
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return (uchar)c & ~utfmask[*i];
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return 0;
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}
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size_t
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utf8encode(long u, char *c, size_t clen) {
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size_t len, i;
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len = utf8validate(&u, 0);
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if(clen < len)
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return 0;
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for(i = len - 1; i != 0; --i) {
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c[i] = utf8encodebyte(u, 0);
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u >>= 6;
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}
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c[0] = utf8encodebyte(u, len);
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return len;
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}
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char
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utf8encodebyte(long u, size_t i) {
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return utfbyte[i] | (u & ~utfmask[i]);
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}
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size_t
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utf8len(char *c) {
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return utf8decode(c, &(long){0}, UTF_SIZ);
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}
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size_t
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utf8validate(long *u, size_t i) {
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if(!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
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*u = UTF_INVALID;
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for(i = 1; *u > utfmax[i]; ++i)
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;
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return i;
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}
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static void
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@ -984,7 +933,7 @@ getsel(void) {
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if(!selected(x, y) || (gp->mode & ATTR_WDUMMY))
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continue;
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size = utf8size(gp->c);
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size = utf8len(gp->c);
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memcpy(ptr, gp->c, size);
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ptr += size;
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}
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@ -1298,7 +1247,7 @@ ttyread(void) {
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char *ptr;
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char s[UTF_SIZ];
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int charsize; /* size of utf8 char in bytes */
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long utf8c;
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long unicodep;
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int ret;
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/* append read bytes to unprocessed bytes */
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@ -1308,9 +1257,8 @@ ttyread(void) {
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/* process every complete utf8 char */
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buflen += ret;
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ptr = buf;
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while(buflen >= UTF_SIZ || isfullutf8(ptr,buflen)) {
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charsize = utf8decode(ptr, &utf8c);
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utf8encode(&utf8c, s);
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while(charsize = utf8decode(ptr, &unicodep, buflen)) {
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utf8encode(unicodep, s, UTF_SIZ);
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tputc(s, charsize);
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ptr += charsize;
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buflen -= charsize;
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@ -2414,14 +2362,14 @@ void
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tputc(char *c, int len) {
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uchar ascii = *c;
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bool control = ascii < '\x20' || ascii == 0177;
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long u8char;
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long unicodep;
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int width;
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if(len == 1) {
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width = 1;
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} else {
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utf8decode(c, &u8char);
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width = wcwidth(u8char);
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utf8decode(c, &unicodep, UTF_SIZ);
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width = wcwidth(unicodep);
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}
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if(IS_SET(MODE_PRINT))
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@ -3150,7 +3098,7 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
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int frcflags;
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int u8fl, u8fblen, u8cblen, doesexist;
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char *u8c, *u8fs;
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long u8char;
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long unicodep;
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Font *font = &dc.font;
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FcResult fcres;
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FcPattern *fcpattern, *fontpattern;
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@ -3293,11 +3241,11 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
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oneatatime = font->width != xw.cw;
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for(;;) {
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u8c = s;
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u8cblen = utf8decode(s, &u8char);
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u8cblen = utf8decode(s, &unicodep, UTF_SIZ);
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s += u8cblen;
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bytelen -= u8cblen;
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doesexist = XftCharExists(xw.dpy, font->match, u8char);
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doesexist = XftCharExists(xw.dpy, font->match, unicodep);
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if(oneatatime || !doesexist || bytelen <= 0) {
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if(oneatatime || bytelen <= 0) {
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if(doesexist) {
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@ -3329,7 +3277,7 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
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/* Search the font cache. */
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for(i = 0; i < frclen; i++) {
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if(XftCharExists(xw.dpy, frc[i].font, u8char)
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if(XftCharExists(xw.dpy, frc[i].font, unicodep)
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&& frc[i].flags == frcflags) {
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break;
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}
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@ -3351,7 +3299,7 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
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fcpattern = FcPatternDuplicate(font->pattern);
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fccharset = FcCharSetCreate();
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FcCharSetAddChar(fccharset, u8char);
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FcCharSetAddChar(fccharset, unicodep);
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FcPatternAddCharSet(fcpattern, FC_CHARSET,
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fccharset);
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FcPatternAddBool(fcpattern, FC_SCALABLE,
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@ -3387,7 +3335,7 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
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xp, winy + frc[i].font->ascent,
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(FcChar8 *)u8c, u8cblen);
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xp += xw.cw * wcwidth(u8char);
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xp += xw.cw * wcwidth(unicodep);
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}
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/*
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@ -3430,7 +3378,7 @@ xdrawcursor(void) {
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memcpy(g.c, term.line[term.c.y][term.c.x].c, UTF_SIZ);
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/* remove the old cursor */
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sl = utf8size(term.line[oldy][oldx].c);
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sl = utf8len(term.line[oldy][oldx].c);
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width = (term.line[oldy][oldx].mode & ATTR_WIDE)? 2 : 1;
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xdraws(term.line[oldy][oldx].c, term.line[oldy][oldx], oldx,
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oldy, width, sl);
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@ -3444,7 +3392,7 @@ xdrawcursor(void) {
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g.bg = defaultfg;
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}
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sl = utf8size(g.c);
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sl = utf8len(g.c);
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width = (term.line[term.c.y][curx].mode & ATTR_WIDE)\
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? 2 : 1;
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xdraws(g.c, g, term.c.x, term.c.y, width, sl);
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@ -3516,7 +3464,7 @@ drawregion(int x1, int y1, int x2, int y2) {
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Glyph base, new;
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char buf[DRAW_BUF_SIZ];
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bool ena_sel = sel.ob.x != -1;
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long u8char;
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long unicodep;
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if(sel.alt ^ IS_SET(MODE_ALTSCREEN))
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ena_sel = 0;
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@ -3548,7 +3496,7 @@ drawregion(int x1, int y1, int x2, int y2) {
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base = new;
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}
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sl = utf8decode(new.c, &u8char);
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sl = utf8decode(new.c, &unicodep, UTF_SIZ);
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memcpy(buf+ib, new.c, sl);
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ib += sl;
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ic += (new.mode & ATTR_WIDE)? 2 : 1;
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@ -3707,7 +3655,7 @@ kpress(XEvent *ev) {
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if(IS_SET(MODE_8BIT)) {
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if(*buf < 0177) {
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c = *buf | 0x80;
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len = utf8encode(&c, buf);
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len = utf8encode(c, buf, UTF_SIZ);
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}
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} else {
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buf[1] = buf[0];
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