Subject: Re: changed wsvt25 termcap entry causes regression
To: NetBSD-current Users's Discussion List <>
From: Greg A. Woods <>
List: current-users
Date: 02/23/2007 14:31:16
At Fri, 23 Feb 2007 17:03:19 +0100,
Jukka Salmi wrote:
> since the recent [1]change of the wsvt25 termcap entry I noticed the
> following on wscons(4) terminals (TERM=wsvt25m): when reading a file
> using less(1), scrolling forward one line at a time using `j' doesn't
> work anymore if the first character of the line is a tab. Is anybody
> able to reproduce this? Try e.g. [2]this file...

Hmmmm.... The description in the commit doesn't seem to describe the
change completely.  "is" was changed, even though the part removed was
added to "ti", I don't think it was a good idea to remove that part of
the sequence from "is" since some programs may only use "is".  There's
no problem, so far as I can tell, with sending the "\E)0" part twice if
some program actually uses both "is" and "ti".

On the other hand 'less' uses "ti" and "te", but not "is".  :-)

I'm also not sure it was a good idea to negate "if".  That may be the
real cause of the observed problem.  So far as I can tell it is always
necessary to initialize the tab settings on wscons (in its mis-named
vt100 emulation mode) (and why it's necessary to use "stty oxtabs" for
raw output by non-curses programs).  Testing may not have revealed this
problem unless the tab settings were purposefully scrambled or cleared
after each test.  On the other hand I don't see immediately that 'less'
uses "if".  Hmmm....  Maybe something else used during testing did use

It's also not necessary to use vt220-8.  The full vt220 entry, even
after being appended to the new wsvt25 (and wsvt25m) entry does fit
within 1023 bytes just fine.

revision 1.99
date: 2007/02/16 21:33:12;  author: wiz;  state: Exp;  lines: +3 -3
Add if, NC, ti and te to wsvt25 termcap entry. Should fix PR 34995.
Patch from Onno van der Linden (and Sergey Svishchev).

@@ -930,9 +930,9 @@
 # NetBSD "wscons" emulator in vt220 mode
 wsvt25|NetBSD wscons in 25 line DEC VT220 mode:\
-       :Co#8:pa#64:it#8:ut:co#80:li#25:vb@:xn@:\
+       :Co#8:pa#64:it#8:ut:co#80:li#25:vb@:xn@:if@:NC#2:\
-       :AB=\E[4%dm:AF=\E[3%dm:op=\E[m:is=\E[!p\E)0:\
+       :AB=\E[4%dm:AF=\E[3%dm:op=\E[m:is=\E[!p:ti=\E)0:te=\E)B:\
						Greg A. Woods

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