From 1d84a25665013f389ffc6fad7dd133f1c6287a08 Mon Sep 17 00:00:00 2001
From: David Mitchell <davem@iabyn.com>
Date: Tue, 6 Aug 2019 14:36:45 +0100
Subject: [PATCH] include a trailing \0 in SVs holding trie info
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RT #13427

TRIE_STORE_REVCHAR() was creating SvPV()s with no trailing '\0'. This
doesn't really matter given the specialised use these are put to, but
it upset valgrind et al when perl was run with -Drv which printf("%s")'s
the contents of the string.

Signed-off-by: Petr Písař <ppisar@redhat.com>
---
 regcomp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/regcomp.c b/regcomp.c
index 370221f72e..1117998fc8 100644
--- a/regcomp.c
+++ b/regcomp.c
@@ -2526,7 +2526,8 @@ is the recommended Unicode-aware way of saying
 	if (UTF) {							   \
             SV *zlopp = newSV(UTF8_MAXBYTES);				   \
 	    unsigned char *flrbbbbb = (unsigned char *) SvPVX(zlopp);	   \
-            unsigned const char *const kapow = uvchr_to_utf8(flrbbbbb, val); \
+            unsigned char *const kapow = uvchr_to_utf8(flrbbbbb, val);     \
+            *kapow = '\0';                                                 \
 	    SvCUR_set(zlopp, kapow - flrbbbbb);				   \
 	    SvPOK_on(zlopp);						   \
 	    SvUTF8_on(zlopp);						   \
-- 
2.20.1