readuntil

# File lib/net/protocol.rb, line 188
    def readuntil(terminator, ignore_eof = false)
      begin
        until idx = @rbuf.index(terminator)
          rbuf_fill
        end
        return rbuf_consume(idx + terminator.size)
      rescue EOFError
        raise unless ignore_eof
        return rbuf_consume(@rbuf.size)
      end
    end