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http://bugs.exim.org/show_bug.cgi?id=1100
--- Comment #1 from Tom Hughes <tom@???> 2011-03-25 14:42:02 ---
Created an attachment (id=471)
--> (
http://bugs.exim.org/attachment.cgi?id=471)
Patch to fix backtracking
The problem is that when processing OP_EXTUNI in match() the backtracking does
this to see if we have backtracked far enough:
if (eptr-- == pp) break; /* Stop if tried at original pos */
The problem of course, is that simply decrementing by one will not move us
backwards properly if the last character was a multibyte UTF-8 sequence - we
need to call BACKCHAR to find the start of the previous character.
The attached patch seems to fix things, although you may have a cleaner way of
doing it.
I would also note that, from a quick search through the source, there are
probably similar problems in some of the other ops.
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