Ignore all control characters not handled
authorRoberto E. Vargas Caballero <k0ga@shike2.com>
Wed, 26 Sep 2012 18:53:46 +0000 (20:53 +0200)
committerRoberto E. Vargas Caballero <k0ga@shike2.com>
Wed, 26 Sep 2012 18:53:46 +0000 (20:53 +0200)
Taken from vt100 programmer manual:

Control characters have values of \000 - \037, and \177. The control
characters recognized by the VT100 are shown in Table 3-10. All
other control codes cause no action to be taken.

We have to take attention when we are using alternate charset, because in
this cases they are not used as control characters.
---
 st.c |   20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

st.c

diff --git a/st.c b/st.c
index a64b84d..515dfb1 100644 (file)
--- a/st.c
+++ b/st.c
@@ -1663,7 +1663,7 @@ tputtab(bool forward) {
 
 void
 tputc(char *c, int len) {
-       char ascii = *c;
+       uchar ascii = *c;
 
        if(iofd != -1)
                write(iofd, c, len);
@@ -1792,8 +1792,6 @@ tputc(char *c, int len) {
                if(sel.bx != -1 && BETWEEN(term.c.y, sel.by, sel.ey))
                        sel.bx = -1;
                switch(ascii) {
-               case '\0': /* padding character, do nothing */
-                       break;
                case '\t':
                        tputtab(1);
                        break;
@@ -1818,13 +1816,15 @@ tputc(char *c, int len) {
                        term.esc = ESC_START;
                        break;
                default:
-                       if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
-                               tnewline(1); /* always go to first col */
-                       tsetchar(c);
-                       if(term.c.x+1 < term.col)
-                               tmoveto(term.c.x+1, term.c.y);
-                       else
-                               term.c.state |= CURSOR_WRAPNEXT;
+                       if(ascii >= '\020' || term.c.attr.mode & ATTR_GFX) {
+                               if(IS_SET(MODE_WRAP) && term.c.state & CURSOR_WRAPNEXT)
+                                       tnewline(1); /* always go to first col */
+                               tsetchar(c);
+                               if(term.c.x+1 < term.col)
+                                       tmoveto(term.c.x+1, term.c.y);
+                               else
+                                       term.c.state |= CURSOR_WRAPNEXT;
+                       }
                }
        }
 }