Date: Sun, 26 Sep 1999 20:33:34 -0700 (PDT) From: dot@dotat.at To: freebsd-gnats-submit@freebsd.org Subject: gnu/13989: SIGWINCH corrupts the display of a multiline readline prompt with invisible characters Message-ID: <19990927033334.6F11614DED@hub.freebsd.org>
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>Number: 13989
>Category: gnu
>Synopsis: SIGWINCH corrupts the display of a multiline readline prompt with invisible characters
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sun Sep 26 20:40:00 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator: Tony Finch
>Release: 3.3-RC-19990916
>Organization:
Demon Internet
>Environment:
FreeBSD fanf.eng.demon.net 3.3-RC-19990916 FreeBSD 3.3-RC-19990916 #3: Thu Sep 16 03:06:33 BST 1999 root@fanf.eng.demon.net:/usr/src/sys/compile/DELL-PREC410 i386
>Description:
If you are using libreadline with a multiline prompt containing invisible
characters on the last line, then when the program receives SIGWINCH and
redraws the last line of the prompt it outputs spurious ^A and ^B
character(s).
>How-To-Repeat:
run bash in an xterm
set PS1 to 'line one\n\[\e[1m\]line two\[\e[0m\] '
you will then have a two line prompt with invisible characters on the second line
change the size of the xterm; the second line will be bracketed with
a diamond-dither pair
>Fix:
I think the first patch is correct; the second one *might* catch more
cases, but requires a bit more work at run time.
--- /usr/src/contrib/libreadline/display.c.orig Mon Sep 27 04:30:07 1999
+++ /usr/src/contrib/libreadline/display.c Mon Sep 27 04:30:07 1999
@@ -1540,7 +1540,7 @@
oldp = rl_display_prompt;
oldl = local_prompt;
oldlprefix = local_prompt_prefix;
- rl_display_prompt = ++t;
+ rl_display_prompt = oldl ? oldl : ++t;
local_prompt = local_prompt_prefix = (char *)NULL;
rl_forced_update_display ();
rl_display_prompt = oldp;
--- /usr/src/contrib/libreadline/display.c.orig Mon Sep 27 04:30:07 1999
+++ /usr/src/contrib/libreadline/display.c Mon Sep 27 04:30:07 1999
@@ -1540,9 +1540,10 @@
oldp = rl_display_prompt;
oldl = local_prompt;
oldlprefix = local_prompt_prefix;
- rl_display_prompt = ++t;
+ rl_display_prompt = expand_prompt(++t);
local_prompt = local_prompt_prefix = (char *)NULL;
rl_forced_update_display ();
+ free(rl_display_prompt);
rl_display_prompt = oldp;
local_prompt = oldl;
local_prompt_prefix = oldlprefix;
>Release-Note:
>Audit-Trail:
>Unformatted:
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