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http://bugs.exim.org/show_bug.cgi?id=1546
Philip Hazel <ph10@???> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
--- Comment #1 from Philip Hazel <ph10@???> 2014-11-19 11:01:36 ---
Thank you for this report. The bug was actually in the PCRE library, not in
pcregrep. It was provoked by the use of an assertion with a zero minimum repeat
as the condition in a conditional group. (I always thought allowing quantifiers
on assertions was crazy, but Perl allows them, so PCRE does - though I see that
Perl does not allow this particular case. Sigh.)
The fix is a simple one-line-of-code patch to pcre_exec.c. I have committed
this patch to the repository.
--- pcre_exec.c (revision 1512)
+++ pcre_exec.c (working copy)
@@ -1404,8 +1404,11 @@
condition = TRUE;
/* Advance ecode past the assertion to the start of the first branch,
- but adjust it so that the general choosing code below works. */
-
+ but adjust it so that the general choosing code below works. If the
+ assertion has a quantifier that allows zero repeats we must skip over
+ the BRAZERO. This is a lunatic thing to do, but somebody did! */
+
+ if (*ecode == OP_BRAZERO) ecode++;
ecode += GET(ecode, 1);
while (*ecode == OP_ALT) ecode += GET(ecode, 1);
ecode += 1 + LINK_SIZE - PRIV(OP_lengths)[condcode];
--
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