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Optimize tputtab.

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Before this patch executing
	printf '\e[10000000000I'
or
	printf '\e[10000000000Z'
resulted in long delay.
This commit is contained in:
noname 2014-04-23 23:12:45 +04:00 committed by Roberto E. Vargas Caballero
parent 1b0b9759dc
commit 844c503c80
1 changed files with 12 additions and 16 deletions
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28
st.c
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@ -375,7 +375,7 @@ static void tmoveto(int, int);
static void tmoveato(int, int);
static void tnew(int, int);
static void tnewline(int);
static void tputtab(bool);
static void tputtab(int);
static void tputc(char *, int);
static void treset(void);
static int tresize(int, int);
@ -1996,8 +1996,7 @@ csihandle(void) {
break;
case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
DEFAULT(csiescseq.arg[0], 1);
while(csiescseq.arg[0]--)
tputtab(1);
tputtab(csiescseq.arg[0]);
break;
case 'J': /* ED -- Clear screen */
selclear(NULL);
@ -2065,8 +2064,7 @@ csihandle(void) {
break;
case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
DEFAULT(csiescseq.arg[0], 1);
while(csiescseq.arg[0]--)
tputtab(0);
tputtab(-csiescseq.arg[0]);
break;
case 'd': /* VPA -- Move to <row> */
DEFAULT(csiescseq.arg[0], 1);
@ -2281,19 +2279,17 @@ tdump(void) {
}
void
tputtab(bool forward) {
tputtab(int n) {
uint x = term.c.x;
if(forward) {
if(x == term.col)
return;
for(++x; x < term.col && !term.tabs[x]; ++x)
/* nothing */ ;
} else {
if(x == 0)
return;
for(--x; x > 0 && !term.tabs[x]; --x)
/* nothing */ ;
if(n > 0) {
while(x < term.col && n--)
for(++x; x < term.col && !term.tabs[x]; ++x)
/* nothing */ ;
} else if(n < 0) {
while(x > 0 && n++)
for(--x; x > 0 && !term.tabs[x]; --x)
/* nothing */ ;
}
tmoveto(x, term.c.y);
}