With 'magicfilter' from printconf-0.2.12-1 the following happens on x86:

# /usr/bin/magicfilter-t 
Segmentation fault (core dumped)
# /usr/bin/magicfilter-t --help
usage: magicfilter printer-driver [options]
 -a   foo            Segmentation fault (core dumped)

# gdb /usr/bin/magicfilter-t core
GNU gdb 5.0rh-5 Red Hat Linux 7.1
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This GDB was configured as "i386-redhat-linux"...
(no debugging symbols found)...
Core was generated by `/usr/bin/magicfilter-t --help'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /lib/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
#0  0x0804bae7 in getline ()
(gdb) where
#0  0x0804bae7 in getline ()
#1  0x0804b21d in getline ()
#2  0x0804958c in strcpy ()
#3  0x40043237 in __libc_start_main () from /lib/libc.so.6

On Alpha a picture is slightly different:

# rpm -q printconf
printconf-0.2.15-1
# /usr/bin/magicfilter-t
Segmentation fault (core dumped)
# /usr/bin/magicfilter-t --help
usage: magicfilter printer-driver [options]

Segmentation fault occures in the same getline() call.