Check return value of find_nmea_start in assemble_vdm

It wasn't properly checking to see if the start of a message was actually found. It will now return a 3 if the message doesn't start with $ or !
bcl · Oct 10, 2015 · b3acb4c · b3acb4c
1 parent 2a075a4
commit b3acb4c
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/c/src/vdm_parse.c b/c/src/vdm_parse.c
@@ -380,7 +380,8 @@ int __stdcall assemble_vdm( ais_state *state, char *str )
     /* Is the string an AIS message? Allow any start character and any
        device pair.
     */
-    p = find_nmea_start( str );
+    if ( (p = find_nmea_start( str )) == NULL )
+        return 3;
     if (   (strncmp( p+3, "VDM", 3 ) != 0)
         && (strncmp( p+3, "VDO", 3 ) != 0) )
     {