Re: updated info for earlier report about -P option

[Tony Abou-Assaleh]

Thanks for the detailed report, Chris.

It seems that this bug is fixed in the CVS. Using the CVS grep:

> echo \? | ./grep -P '\?\s'
?
>

Could you try your test cases with the CVS version? You may download the
CVS version from:

http://savannah.gnu.org/cvs/?group=grep

If you don't wish to build grep from the CVS, you may download a nightly
build from:

http://www.dal-acm.ca/~taa/grep/

Cheers,

TAA

-----------------------------------------------------
Tony Abou-Assaleh
Lecturer, Computer Science Department
Brock University, St. Catharines, ON, Canada, L2S 3A1
Office: MC J215
Tel:    +1(905)688-5550 ext. 5243
Fax:    +1(905)688-3255
Email:  address@hidden
WWW:    http://www.cosc.brocku.ca/~taa/
----------------------[THE END]----------------------

On Fri, 27 Jan 2006, Chris Stith wrote:

> The options
>
> # grep -P '\?\s' filename
>
> segfaults and coredumps when the file consists of the single character '?'.
>
> ###############
>
> I got this from gdb:
>
> # gdb --args /bin/grep -P '\?\s' bar
> GNU gdb 6.3-5mdk (Mandriva Linux release 2006.0)
> Copyright 2004 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you are
> welcome to change it and/or distribute copies of it under certain conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "i586-mandriva-linux-gnu"...(no debugging
> symbols found)
> Using host libthread_db library "/lib/tls/libthread_db.so.1".
>
> (gdb) run
> Starting program: /bin/grep -P \\\?\\s bar
> Reading symbols from shared object read from target memory...(no
> debugging symbols found)...done.
> Loaded system supplied DSO at 0xffffe000
> (no debugging symbols found)
> (no debugging symbols found)
>
> Program received signal SIGSEGV, Segmentation fault.
> 0xb7ef5c4a in pcre_exec () from /lib/libpcre.so.0
> (gdb) q
>
>
> ###############
>
> This PHP program works as expected:
> <?php
>         $file = $argv[1];
>         $content = file_get_contents ( $file );
>         if ( preg_match ( '/\?>\s/', $content ) ) {
>                 print 'matched!' . "\n";
>         }
> ?>
>
> PHP uses PCRE for the Perl-compatible regex functions it offers.
>
> ################
>
> I hope this helps.
>
>