Only taint casereader if case size is unknown.
[pspp] / tests / formats /
drwxr-xr-x   ..
-rw-r--r-- 17 .cvsignore
-rw-r--r-- 55466 bcd-in.expected.cmp.gz
-rwxr-xr-x 1615 bcd-in.sh
-rw-r--r-- 4106 binhex-out.expected.gz
-rwxr-xr-x 2727 binhex-out.sh
-rwxr-xr-x 42520 date-in.sh
-rwxr-xr-x 13643 date-out.sh
-rwxr-xr-x 5585 float-format.sh
-rw-r--r-- 334995 ib-in.expected.cmp.gz
-rwxr-xr-x 1655 ib-in.sh
-rw-r--r-- 1868 inexactify.c
-rw-r--r-- 1945 legacy-in.expected.cmp.gz
-rwxr-xr-x 1645 legacy-in.sh
-rwxr-xr-x 3045 month-in.sh
-rwxr-xr-x 23196 month-out.sh
-rw-r--r-- 9536 num-in.expected.gz
-rwxr-xr-x 4063 num-in.sh
-rw-r--r-- 1321 num-out-cmp.pl
-rw-r--r-- 3464 num-out-compare.pl
-rw-r--r-- 603 num-out-decmp.pl
-rw-r--r-- 209506 num-out.expected.cmp.gz
-rw-r--r-- 1332 num-out.pl
-rwxr-xr-x 1693 num-out.sh
-rwxr-xr-x 17760 time-in.sh
-rwxr-xr-x 207834 time-out.sh
-rwxr-xr-x 1623 wkday-in.sh
-rwxr-xr-x 17310 wkday-out.sh