diff --git a/example/src/tmq.c b/example/src/tmq.c
index 0b5f3be1b0..e867f17e78 100644
--- a/example/src/tmq.c
+++ b/example/src/tmq.c
@@ -22,7 +22,7 @@
 static int  running = 1;
 static void msg_process(TAOS_RES* msg) {
   char buf[1024];
-  memset(buf, 0, 1024);
+  /*memset(buf, 0, 1024);*/
   printf("topic: %s\n", tmq_get_topic_name(msg));
   printf("vg: %d\n", tmq_get_vgroup_id(msg));
   while (1) {
diff --git a/source/client/src/clientMain.c b/source/client/src/clientMain.c
index ae6aee13d5..7360b054e2 100644
--- a/source/client/src/clientMain.c
+++ b/source/client/src/clientMain.c
@@ -303,6 +303,7 @@ int taos_print_row(char *str, TAOS_ROW row, TAOS_FIELD *fields, int num_fields)
         break;
     }
   }
+  str[len] = 0;
 
   return len;
 }
@@ -567,7 +568,7 @@ void taos_query_a(TAOS *taos, const char *sql, __taos_async_fn_t fp, void *param
     // todo directly call fp
   }
 
-  taos_query_l(taos, sql, (int32_t) strlen(sql));
+  taos_query_l(taos, sql, (int32_t)strlen(sql));
 }
 
 void taos_fetch_rows_a(TAOS_RES *res, __taos_async_fn_t fp, void *param) {