misc/172865: bsdgrep(1) segfaults upon empty patterns and case-insensitive mode

[deeptech71]

>Number:         172865
>Category:       misc
>Synopsis:       bsdgrep(1) segfaults upon empty patterns and case-insensitive mode
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Oct 19 01:40:01 UTC 2012
>Closed-Date:
>Last-Modified:
>Originator:     deeptech71
>Release:        -CURRENT
>Organization:
>Environment:
FreeBSD  10.0-CURRENT FreeBSD 10.0-CURRENT #0 r240768M: Fri Sep 21 06:58:11 CEST 2012     root@:/usr/obj/usr/src/sys/HQ  i386
>Description:
bsdgrep(1) segfaults when it is given an empty pattern (through pattern-files or a command-line argument) and is instructed to do case-insensitive matching.
>How-To-Repeat:
Execute the following command line:
bsdgrep -i ""
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: