userspec: disallow an ID that maps to (uid_t)-1 or (gid_t)-1

[pspp] / ChangeLog

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 2009-11-28  Jim Meyering  <meyering@redhat.com>
 
+       userspec: disallow an ID that maps to (uid_t)-1 or (gid_t)-1
+       * lib/userspec.c (parse_with_separator): Do not accept a user ID
+       number of MAXUID when it evaluates to (uid_t) -1.
+       Likewise for group ID.  Reported by Matt McCutchen in
+       <http://savannah.gnu.org/bugs/?28113>
+
        userspec: reformat to use spaces, not TABs
        * lib/userspec.c: Expand TABs to spaces.
        Add Emacs' "indent-tabs-mode: nil" hint.