Issue: match_regex and search_regex were continuing to feed characters

to the regex machine even when there is no transition available.  This
was due to the broken return value protocol of regex_machine_feed.  For
instance for the regex / +/ (one or more spaces), after matching some
spaces, it would report REGM_INCOMPLETE for additional non-space
characters, never reporting REGM_FAIL.

* regex.c (regm_result_t): Block comment added, documenting protocol.
(regex_machine_feed): Return REGM_FAIL if there are no transitions for
the given character, even a partial match has been recorded. This is
a signal to stop feeding more characters. At that point, the function
can be called with a null character to distinguish the three cases:
fail, partial or full match.
(search_regex): Now when the search loop gets a REGM_FAIL, it can
no longer assume that nothing was matched and the search must restart
at the next position. Upon the REGM_FAIL signal, it is necesary to
seal the search by feeding in the 0 character. Only if that returns
REGM_FAIL is it a no match situation. Otherwise it is actually a match!

0 files changed, 0 insertions, 0 deletions