17.6.1.0935   COMPARE                                                               STRING
( c-addr1 u1 c-addr2 u2 -- n )
Compare the string specified by c-addr1 u1 to the string specified by
c-addr2 u2.  The strings are compared, beginning at the given addresses,
character by character, up to the length of the shorter string or until
a difference is found.  If the two strings are identical, n is zero.  If
the two strings are identical up to the length of the shorter string, n
is minus-one (-1) if u1 is less than u2 and one (1) otherwise.  If the
two strings are not identical up to the length of the shorter string, n
is minus-one (-1) if the first non-matching character in the string
specified by c-addr1 u1 has a lesser numeric value than the
corresponding character in the string specified by c-addr2 u2 and one
(1) otherwise.
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