From e09cdf9c3a7beab21cbcc2843e1a948ce25852ca Mon Sep 17 00:00:00 2001
From: Seven Du <dujinfang@gmail.com>
Date: Fri, 27 Sep 2013 03:31:21 +0800
Subject: [PATCH] fix crash on zstr

---
 src/mod/applications/mod_sonar/mod_sonar.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/src/mod/applications/mod_sonar/mod_sonar.c b/src/mod/applications/mod_sonar/mod_sonar.c
index 4453deea90..5a1074e08d 100644
--- a/src/mod/applications/mod_sonar/mod_sonar.c
+++ b/src/mod/applications/mod_sonar/mod_sonar.c
@@ -70,9 +70,16 @@ SWITCH_STANDARD_APP(sonar_app)
 {
 	switch_channel_t *channel = switch_core_session_get_channel(session);
 	char *tone = "%(500,0,1004)";
-	int loops = atoi(data);
-	
-	if ( ! loops ) {
+	const char *arg = (char *) data;
+	int loops;
+
+	if (zstr(arg)) {
+		loops = 5;
+	} else {
+		loops = atoi(data);
+	}
+
+	if (loops < 0) {
 		loops = 5;
 	}