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commit 844c503c800e5e1db1e409f5db729431ee2e5c00
parent 1b0b9759dca9739da04f5c8a206b2f8ee5ed8b25
Author: noname <noname@inventati.org>
Date:   Wed, 23 Apr 2014 23:12:45 +0400

Optimize tputtab.

Before this patch executing
	printf '\e[10000000000I'
or
	printf '\e[10000000000Z'
resulted in long delay.

Diffstat:
M
st.c
 | 
28
++++++++++++----------------

1 file changed, 12 insertions(+), 16 deletions(-)
diff --git a/st.c b/st.c
@@ -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);
 }