From 3fca11d78cfa1fec6199936d57871b9db08226ab Mon Sep 17 00:00:00 2001

From: Paolo Bonzini <bonzini@gnu.org>

Date: Thu, 29 Apr 2010 17:13:32 +0200

Subject: [PATCH 2/2] fall back to glibc matcher if a MBCSET is found

This patch works around the performance problems of multibyte grep

upstream.

For UTF-8 it should trigger only in the presence of MBCSET, e.g. [a-z].

For other character sets all brackets and `.` as well will trigger it.

---

 src/dfa.c |    9 +++++++++

 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/src/dfa.c b/src/dfa.c

index e13c361..523fe05 100644

--- a/src/dfa.c

+++ b/src/dfa.c

@@ -2927,6 +2927,15 @@ dfaexec (struct dfa *d, char const *begin, char *end,

 		continue;

 	      }

+	    if (backref)

+              {

+                *backref = 1;

+                free(mblen_buf);

+                free(inputwcs);

+                *end = saved_end;

+                return (char *) p;

+              }

+

 	    /* Can match with a multibyte character (and multi character

 	       collating element).  Transition table might be updated.  */

 	    s = transit_state(d, s, &p);

-- 

1.6.6.1