Parses a CCL Find command in a simple C string. Returns CCL parse
tree node describing RPN if parsing is successful. If parsing is
unsuccesful, NULL is returned and error and pos is set accordingly.
Parses a CCL Find command in a simple C string. Returns CCL parse
tree node describing RPN if parsing is successful. If parsing is
unsuccesful, NULL is returned and error and pos is set accordingly.