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Re: ncurses bugs the output of the program I call

From: Grant Edwards
Subject: Re: ncurses bugs the output of the program I call
Date: Sat, 17 Sep 2011 02:13:49 +0000 (UTC)
User-agent: slrn/0.9.9p1 (Linux)

On 2011-09-16, LucasJA <address@hidden> wrote:

>> So you're collecting the output of ps in your program and then writing
>> it to the screen?  It appears that curses doesn't do automatic
>> LF->CR/LF conversion on the strings you write to the screen.  Have you
>> tried inserting a CR before each LF when you write the output?
> Actually I don't collect the output of ps. I let the called program
> to output on the screen for me, but it is outputting all messed up
> (as above).

That's not going to work (as you found out).  Ncurses puts the tty in
to "raw" mode, which disables LF->CR/LF conversion.  All Unix programs
that output text-mode stuff to stdout expect the terminal to be in
"cooked" or "canonical" mode so that newlines (LFs) get converted into
CR/LF pairs.

If you want to run programs like 'ps' and show the output in an
ncruses window, you need to use a pipe to collect the output and write
it to the window yourself, doing things like inserting CRs when you
see a LF.


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