From b6ec3509104e20a196dce2c371d3ec728b7f4200 Mon Sep 17 00:00:00 2001
From: Tilghman Lesher <tilghman@meg.abyt.es>
Date: Wed, 31 Oct 2007 15:46:41 +0000
Subject: [PATCH] Optimize pbx_substitute_variables

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@87811 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---
 main/pbx.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/main/pbx.c b/main/pbx.c
index aecaa13eb2..d408287078 100644
--- a/main/pbx.c
+++ b/main/pbx.c
@@ -1819,10 +1819,15 @@ void pbx_substitute_variables_varshead(struct varshead *headp, const char *cp1,
 
 static void pbx_substitute_variables(char *passdata, int datalen, struct ast_channel *c, struct ast_exten *e)
 {
+	const char *tmp;
 	memset(passdata, 0, datalen);
 
+	/* Nothing more to do */
+	if (!e->data)
+		return;
+
 	/* No variables or expressions in e->data, so why scan it? */
-	if (e->data && !strchr(e->data, '$') && !strstr(e->data,"${") && !strstr(e->data,"$[") && !strstr(e->data,"$(")) {
+	if ((!(tmp = strchr(e->data, '$'))) || (!strstr(tmp, "${") && !strstr(tmp, "$["))) {
 		ast_copy_string(passdata, e->data, datalen);
 		return;
 	}