# File lib/mpdserver.rb, line 1119
        def args_check( sock, cmd, argv, argc )
                if (argc.kind_of? Range and argc.include?(argv.length)) or
                                (argv.length == argc)
                        yield argv
                else
                        sock.puts "ACK [2@0] {#{cmd}} wrong number of arguments for \"#{cmd}\""
                end
        end