"""
This module provides utility functions and classed for I/O.
"""


class CharacterDevice(object):
	def __init__(self, file_):
		self._file = file_

	def getc(self):
		return self._file.read(1)
	def ungetc(self, c):
		self._file.seek(-1, 1)
	def ungets(self, s):
		self._file.seel(-len(s), 1)
	def close(self):
		return self._file.close()