In a multibyte locale such as en_GB.UTF-8, the pg command cannot handle files
containing a form feed character (ASCII 0x0c) at the start of a line. The
program enters an infinite loop.
I've traced the problem to the function endline_for_mb in file pg.c. The code
assumes that the libc function wcwidth will return a nonnegative value, which
is not true for a form feed character. wcwidth returns -1 and the unsigned
variable "pos" goes into underflow.
I'll attach a patch which tests whether the character is printable before
calling wcwidth. If not, it uses instead the width of the constant L'?' which
is later used to replace nonprintable characters. I trust that we can assume
printability of this constant :-)
Steps to Reproduce:
1. Select a multibyte locale (tested with en_GB.UTF-8)
2. Create a file with a form feed character (0x0c) at the start of a line.
3. Try to display this file using the pg command.
Reported-by: Mark Calderbank <m.calderbank@iname.com>
Reported-by: Mike Frysinger <vapier@gentoo.org>
Addresses: https://bugs.gentoo.org/297717
Signed-off-by: Karel Zak <kzak@redhat.com>
Run pg(1) and type '/<CR>' which is supposed to forward search for the
previously remembered search string. pg(1) will segfault after printing
"No remembered search string:".
Signed-off-by: Rajeev V. Pillai <rajeevvp@gmail.com>
Signed-off-by: Karel Zak <kzak@redhat.com>
On Monday 03 September 2007, Karel Zak wrote:
> http://thread.gmane.org/gmane.linux.utilities.util-linux-ng/590/focus=592
>
> I agree that we need a better support for compilation without
> locales, but from my point of view NLS != all locales stuff. The NLS
> support is subset only.
thinking about the input from everyone, i'd propose the attached ...
Only pull in locale.h as needed and move it to the common nls.h.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
There has been unexpected mix of HAVE_WIDECHAR and ENABLE_WIDECHAR macros. The
ENABLE_WIDECHAR is old version and has to be replaced everywhere otherwise we
will see bugs with multibyte stuff.
Signed-off-by: Karel Zak <kzak@redhat.com>
