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Re: Incorrect readline's idea of the screen size


From: Chet Ramey
Subject: Re: Incorrect readline's idea of the screen size
Date: Mon, 15 Jul 2002 09:24:29 -0400

> Machine Type: i686-pc-linux-gnu
> 
> Bash Version: 2.05a
> Patch Level: 0
> Release Status: release
> 
> Description:
>       Readline's idea of the screen size is incorrect after resizing
>       the terminal while bash is a background process.
> 
> Repeat-By:
>       0. Suppose your terminal width is 80 columns
>       1. Execute 'cat'
>       2. Resize your terminal to 85 columns
>       3. Exit 'cat' with ^D
>       4. Write a line so that your cursor goes beyond the 80th column
>       5. Constat the bug: the cursor does not jump to the line below,
>         but instead overwrites the beginning of the current line
> 
> Fix:
>       A quick look at the source code shows that
>       rl_sigwinch_handler() is called on SIGWINCH. But this signal
>       is not sent to bash while it's in background.
>       A quick hack would be:
>         0. Save the current terminal size just before placing
>           another process group in foreground
>         1. When bash comes back to foreground, compare the
>           new current terminal size with the old one.
>         2. If they differ, call rl_sigwinch_handler()

Why not look at the `checkwinsize' option to `shopt'?

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
( ``Discere est Dolere'' -- chet )

Chet Ramey, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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