Observations

  def bytes(is: InputStream) : Iterator[Byte] = new Iterator[Byte] {
    def hasNext = is.available > 0
    def next = is.read.toByte

  def isText(b: Byte) = b == 0x0a || b == 0x0d || b >= 32 && b < 0xff

  def chars(is: InputStream) = bytes(is) filter isText map (_.toChar)

  def main(args: Array[String]) {
    val is = new FileInputStream(args(0))
    for (c <- chars(is)) print(c)
  }