the %s portion of the printf format is optional

diff --git a/src/rrd_graph.c b/src/rrd_graph.c
index 51afbf0e0958f054efda6e09ef435c81bb3de47b..13fcc86f87c4b3abb29c3ce563a3fd50144c5cc3 100644 (file)
--- a/src/rrd_graph.c
+++ b/src/rrd_graph.c
@@ -5089,7 +5089,7 @@ int bad_format_axis(char *fmt){
 }
 
 int bad_format_print(char *fmt){
-    return bad_format_check("^" SAFE_STRING FLOAT_STRING SAFE_STRING "%s" SAFE_STRING "$",fmt);
+    return bad_format_check("^" SAFE_STRING FLOAT_STRING SAFE_STRING "(?:%s)?" SAFE_STRING "$",fmt);
 }
 
 int vdef_parse(