Flurry of regex bugfixes.

* regex.c (match_regex): Bail if pos is too positive,
beyond length of string.
(match_regex_right): Include the pos == end case in the
iteration, so we can match an empty suffix of the string. The
inner loop guard takes care of not feeding any characters from
the string into the regex machine in this case; we just feed
the terminating zero to get the final state.
(match_regst): Normalize a negative pos, otherwise the sub_str
calculation will be junk, since match_regex returns a
normalized position.  After normalizing, check that if the
position is still negative, the match must fail.
(match_regst_right_old, match_regst_right): Use zero rather
than t as the range end in sub_str. That way if len is
zero and neg(len) produces zero, an empty string will
be sliced out. For negative values, the zero serves
as one position beyond the last char, just like t.
(do_match_full_offs, regex_match_full, regex_range_full,
regex_range_left): Fail match if normalized starting
pos is negative.
(regex_range_right): Fix completely bogus calculation of the
returne range in the case when the end position defaults to
the string length.

0 files changed, 0 insertions, 0 deletions