#!/usr/bin/env python

"""
Copyright (c) 2006-2019 sqlmap developers (http://sqlmap.org/)
See the file 'LICENSE' for copying permission
"""

class _Getch(object):
 """
 Gets a single character from standard input. Does not echo to
 the screen (reference: http://code.activestate.com/recipes/134892/)
 """
 def __init__(self):
 try:
 self.impl = _GetchWindows()
 except ImportError:
 try:
 self.impl = _GetchMacCarbon()
 except(AttributeError, ImportError):
 self.impl = _GetchUnix()

 def __call__(self):
 return self.impl()

class _GetchUnix(object):
 def __init__(self):
 __import__("tty")

 def __call__(self):
 import sys
 import termios
 import tty

 fd = sys.stdin.fileno()
 old_settings = termios.tcgetattr(fd)
 try:
 tty.setraw(sys.stdin.fileno())
 ch = sys.stdin.read(1)
 finally:
 termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
 return ch

class _GetchWindows(object):
 def __init__(self):
 __import__("msvcrt")

 def __call__(self):
 import msvcrt
 return msvcrt.getch()

class _GetchMacCarbon(object):
 """
 A function which returns the current ASCII key that is down;
 if no ASCII key is down, the null string is returned. The
 page http://www.mactech.com/macintosh-c/chap02-1.html was
 very helpful in figuring out how to do this.
 """
 def __init__(self):
 import Carbon

 getattr(Carbon, "Evt") # see if it has this (in Unix, it doesn't)

 def __call__(self):
 import Carbon

 if Carbon.Evt.EventAvail(0x0008)[0] == 0: # 0x0008 is the keyDownMask
 return ''
 else:
 #
 # The event contains the following info:
 # (what,msg,when,where,mod)=Carbon.Evt.GetNextEvent(0x0008)[1]
 #
 # The message (msg) contains the ASCII char which is
 # extracted with the 0x000000FF charCodeMask; this
 # number is converted to an ASCII character with chr() and
 # returned
 #
 (what, msg, when, where, mod) = Carbon.Evt.GetNextEvent(0x0008)[1]
 return chr(msg & 0x000000FF)

getch = _Getch()