Add HTS sequence

This sequence adds a new tab stop in the current horizontal position. This
means that tputtab must be look for the next tab stop in the tabs array
instead of using a hard coded value offset. Also, CHT sequence XXX message
is removed because it is not a vt10x sequence (as far as I know it is a
vt50x sequence), and it is not implemented by linux virtual terminal neither
by xterm.

Signed-off-by: Roberto E. Vargas Caballero <k0ga@shike2.com>
---
 st.c |   12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/st.c b/st.c
index d169ddf..4b7e4eb 100644 (file)
--- a/st.c
+++ b/st.c
@@ -1214,7 +1214,6 @@ csihandle(void) {
                DEFAULT(escseq.arg[1], 1);
                tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
                break;
-       /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
        case 'J': /* ED -- Clear screen */
                sel.bx = -1;
                switch(escseq.arg[0]) {
@@ -1429,8 +1428,11 @@ csireset(void) {
 
 void
 tputtab(void) {
-       int space = TAB - term.c.x % TAB;
-       tmoveto(term.c.x + space, term.c.y);
+       unsigned x;
+
+       for (x = term.c.x + 1; x < term.col && !term.tabs[x]; ++x)
+               /* nothing */ ;
+       tmoveto(x, term.c.y);
 }
 
 void
@@ -1491,6 +1493,10 @@ tputc(char *c) {
                                tnewline(1); /* always go to first col */
                                term.esc = 0;
                                break;
+                       case 'H': /* HTS -- Horizontal tab stop */
+                               term.tabs[term.c.x] = 1;
+                               term.esc = 0;
+                               break;
                        case 'M': /* RI -- Reverse index */
                                if(term.c.y == term.top)
                                        tscrolldown(term.top, 1);