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Bug#265552: pstree indentation doesn't line up in xterm



On Fri, Aug 13, 2004 at 09:00:13PM +0200, Joey Hess wrote:
> Package: xterm
> Version: 4.3.0.dfsg.1-6
> Severity: normal

that's xterm 191?

e.g., output from
	xterm -v
 
> The pstree command outputs a process tree, and on a capable terminal
> such as xterm it will use some kind of escape sequences to display line
> drawing characters(?). It seems that this sometimes confuses xterm
> leading to display glitches. Let me try to paste in what I'm seeing:

"sometimes"(?)
- I don't see this behavior when I'm looking for it.
(I saw the previous posting wrt this problem).
 
much of the posting is relatively simple.  However -

> So the indentation is broken with the line drawing characters. At first I
> assumed this was a pstree bug, but then I straced it:
> 
> write(1, "     \33(0\17tq\33(Bxdm\33(0\17qwq\33(BXFree"..., 41     tqxdmqwqXFree86-debug) = 41
> write(1, "     \33(0\17x\33(B     \33(0\17mq\33(Bxdm\33("..., 80     x     mqxdmqqq.xsessionqwqionqwqfirefo+) = 80
                 ^^^^^^^^^^^^^^
This caught my eye though.  It doesn't correspond to one of the terminal
descriptions in ncurses.  Checking the source (psmisc), I see that it's
using hardcoded escape sequences in combination with some termcap features.

It also has some hardcoded behavior which would make it produce garbage
for ISO-8859-1 text, since it assumes that it must be UTF-8.  (I'm
looking at the out_char function in pstree.c).  That makes it look like
a problem in psmisc rather than xterm.

> The strace shows that pstree is properly indenting the lines that do not

I'm not certain about "properly" unless I take the whole thing apart.
I'll look at the typescript (though it seemed mangled by the newsreader).

> diplay indented when it's not straced. Also, notice that after each write()
> output by strace, we see the actual result of the write, and in each case
> xterm managed this time to display the leading indentation properly.
> 
> I sshed around to a few other systems, and pstree on those has the
> occasional missing indentation too. These systems were running various
> versions of pstree. I also tried running it in gnome-terminal, and in
> uxterm, and in both cases it displayed ok. I cleared all X resource

But when you're running in xterm, what locale?

> indentation. I hope it's enough to help reproduce the bug.

I don't see the $TERM and locale variables which are in use - those 
are relevant.

-- 
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net

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