From 918ed08b4415c8f9a94c22588a328c712317dea9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <ppisar@redhat.com>
Date: Thu, 5 Apr 2012 17:30:16 +0200
Subject: [PATCH] Fix look-behind assertion in UTF-8 JIT mode
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This is back-port of upstream commit for pcre-8.30:
r953 | zherczeg | 2012-03-29 19:41:57 +0200 (Čt, 29 bře 2012) | 1 line
Fixed a bug for backward assertions with REVERSE 0 in the JIT compiler
---
 pcre_jit_compile.c   |    3 ++-
 testdata/testinput5  |    3 +++
 testdata/testoutput5 |    4 ++++
 3 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/pcre_jit_compile.c b/pcre_jit_compile.c
index 97d227c..dfb78a7 100644
--- a/pcre_jit_compile.c
+++ b/pcre_jit_compile.c
@@ -3417,7 +3417,8 @@ switch(type)
 
   case OP_REVERSE:
   length = GET(cc, 0);
-  SLJIT_ASSERT(length > 0);
+  if (length == 0)
+    return cc + LINK_SIZE;
   OP1(SLJIT_MOV, TMP1, 0, ARGUMENTS, 0);
 #ifdef SUPPORT_UTF
   if (common->utf)
diff --git a/testdata/testinput5 b/testdata/testinput5
index 4f7cb32..de41fce 100644
--- a/testdata/testinput5
+++ b/testdata/testinput5
@@ -691,4 +691,7 @@
     \x{2027}\x{2030}\x{2028}\x{2029}
     \x09\x0e\x{84}\x{86}\x{85}\x0a\x0b\x0c\x0d
 
+/(?<!^)ETA/8
+    ETA
+
 /-- End of testinput5 --/
diff --git a/testdata/testoutput5 b/testdata/testoutput5
index 3c90ea5..693b8cd 100644
--- a/testdata/testoutput5
+++ b/testdata/testoutput5
@@ -1649,4 +1649,8 @@ Failed: disallowed Unicode code point (>= 0xd800 && <= 0xdfff) at offset 7
     \x09\x0e\x{84}\x{86}\x{85}\x0a\x0b\x0c\x0d
  0: \x{85}\x{0a}\x{0b}\x{0c}\x{0d}
 
+/(?<!^)ETA/8
+    ETA
+No match
+
 /-- End of testinput5 --/
-- 
1.7.7.6