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Add support for enabling/disabling utf 

There are some ocasions where we want to disable the enconding/decoding of utf8, mainly
because it adds an important overhead. This is partial patch for ESC % G and ESC % @,
where they modified the way that st reads and write from/to the serial line, but it does
not modifies how it interacts with the X window part.
This commit is contained in:
Roberto E. Vargas Caballero 2016-09-13 14:01:18 +02:00
parent 078337d745
commit f0e2d28732
1 changed files with 62 additions and 17 deletions
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79
st.c
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@ -137,6 +137,7 @@ enum term_mode {
MODE_MOUSEMANY = 1 << 18,
MODE_BRCKTPASTE = 1 << 19,
MODE_PRINT = 1 << 20,
MODE_UTF8 = 1 << 21,
MODE_MOUSE = MODE_MOUSEBTN|MODE_MOUSEMOTION|MODE_MOUSEX10\
|MODE_MOUSEMANY,
};
@ -158,6 +159,7 @@ enum escape_state {
ESC_ALTCHARSET = 8,
ESC_STR_END = 16, /* a final string was encountered */
ESC_TEST = 32, /* Enter in test mode */
ESC_UTF8 = 64,
};
enum window_state {
@ -412,6 +414,7 @@ static void tfulldirt(void);
static void techo(Rune);
static void tcontrolcode(uchar );
static void tdectest(char );
static void tdefutf8(char);
static int32_t tdefcolor(int *, int *, int);
static void tdeftran(char);
static inline int match(uint, uint);
@ -1478,17 +1481,29 @@ ttyread(void)
if ((ret = read(cmdfd, buf+buflen, LEN(buf)-buflen)) < 0)
die("Couldn't read from shell: %s\n", strerror(errno));
/* process every complete utf8 char */
buflen += ret;
ptr = buf;
while ((charsize = utf8decode(ptr, &unicodep, buflen))) {
tputc(unicodep);
ptr += charsize;
buflen -= charsize;
}
for (;;) {
if (IS_SET(MODE_UTF8)) {
/* process a complete utf8 char */
charsize = utf8decode(ptr, &unicodep, buflen);
if (charsize == 0)
break;
tputc(unicodep);
ptr += charsize;
buflen -= charsize;
} else {
if (buflen <= 0)
break;
tputc(*ptr++ & 0xFF);
buflen--;
}
}
/* keep any uncomplete utf8 char for the next call */
memmove(buf, ptr, buflen);
if (buflen > 0)
memmove(buf, ptr, buflen);
return ret;
}
@ -1554,15 +1569,26 @@ void
ttysend(char *s, size_t n)
{
int len;
char *t, *lim;
Rune u;
ttywrite(s, n);
if (IS_SET(MODE_ECHO))
while ((len = utf8decode(s, &u, n)) > 0) {
techo(u);
n -= len;
s += len;
if (!IS_SET(MODE_ECHO))
return;
lim = &s[n];
for (t = s; t < lim; t += len) {
if (IS_SET(MODE_UTF8)) {
len = utf8decode(t, &u, n);
} else {
u = *t & 0xFF;
len = 1;
}
if (len <= 0)
break;
techo(u);
n -= len;
}
}
void
@ -1656,7 +1682,7 @@ treset(void)
term.tabs[i] = 1;
term.top = 0;
term.bot = term.row - 1;
term.mode = MODE_WRAP;
term.mode = MODE_WRAP|MODE_UTF8;
memset(term.trantbl, CS_USA, sizeof(term.trantbl));
term.charset = 0;
@ -2689,6 +2715,15 @@ techo(Rune u)
tputc(u);
}
void
tdefutf8(char ascii)
{
if (ascii == 'G')
term.mode |= MODE_UTF8;
else if (ascii == '@')
term.mode &= ~MODE_UTF8;
}
void
tdeftran(char ascii)
{
@ -2851,6 +2886,9 @@ eschandle(uchar ascii)
case '#':
term.esc |= ESC_TEST;
return 0;
case '%':
term.esc |= ESC_UTF8;
return 0;
case 'P': /* DCS -- Device Control String */
case '_': /* APC -- Application Program Command */
case '^': /* PM -- Privacy Message */
@ -2930,10 +2968,15 @@ tputc(Rune u)
Glyph *gp;
control = ISCONTROL(u);
len = utf8encode(u, c);
if (!control && (width = wcwidth(u)) == -1) {
memcpy(c, "\357\277\275", 4); /* UTF_INVALID */
width = 1;
if (!IS_SET(MODE_UTF8)) {
c[0] = u;
width = len = 1;
} else {
len = utf8encode(u, c);
if (!control && (width = wcwidth(u)) == -1) {
memcpy(c, "\357\277\275", 4); /* UTF_INVALID */
width = 1;
}
}
if (IS_SET(MODE_PRINT))
@ -2994,6 +3037,8 @@ tputc(Rune u)
csihandle();
}
return;
} else if (term.esc & ESC_UTF8) {
tdefutf8(u);
} else if (term.esc & ESC_ALTCHARSET) {
tdeftran(u);
} else if (term.esc & ESC_TEST) {