Default un-supplied command arguments to the empty string and zero rather than leaving them potentially un-initialised. This makes it safe for commands to compare argument strings without adding the expense of checking argc first.

git-svn-id: https://arducopter.googlecode.com/svn/trunk@760 f9c3cf11-9bcb-44bc-f272-b75c42450872

libraries/AP_Common/menu.cpp

@@ -85,6 +85,15 @@ Menu::run(void)
 			_argv[argc].f = atof(_argv[argc].str);	// calls strtod, > 700B !
 			argc++;
 		}
+
+		// populate arguments that have not been specified with "" and 0
+		// this is safer than NULL in the case where commands may look
+		// without testing argc
+		while (argc <= MENU_ARGS_MAX) {
+			_argv[argc].str = "";
+			_argv[argc].i = 0;
+			_argv[argc].f = 0;
+		}
 			
 		// look for a command matching the first word (note that it may be empty)
 		for (i = 0; i < _entries; i++) {