Initial commit of OpenSPARC T2 architecture model.

[OpenSPARC-T2-SAM] / sam-t2 / devtools / amd64 / lib / python2.4 / getpass.py

"""Utilities to get a password and/or the current user name.

getpass(prompt) - prompt for a password, with echo turned off
getuser() - get the user name from the environment or password database

On Windows, the msvcrt module will be used.
On the Mac EasyDialogs.AskPassword is used, if available.

"""

# Authors: Piers Lauder (original)
#          Guido van Rossum (Windows support and cleanup)

import sys

__all__ = ["getpass","getuser"]

def unix_getpass(prompt='Password: '):
   """Prompt for a password, with echo turned off.

   Restore terminal settings at end.
   """

   try:
       fd = sys.stdin.fileno()
   except:
       return default_getpass(prompt)

   old = termios.tcgetattr(fd)     # a copy to save
   new = old[:]

   new[3] = new[3] & ~termios.ECHO # 3 == 'lflags'
   try:
       termios.tcsetattr(fd, termios.TCSADRAIN, new)
       passwd = _raw_input(prompt)
   finally:
       termios.tcsetattr(fd, termios.TCSADRAIN, old)

   sys.stdout.write('\n')
   return passwd


def win_getpass(prompt='Password: '):
   """Prompt for password with echo off, using Windows getch()."""
   if sys.stdin is not sys.__stdin__:
       return default_getpass(prompt)
   import msvcrt
   for c in prompt:
       msvcrt.putch(c)
   pw = ""
   while 1:
       c = msvcrt.getch()
       if c == '\r' or c == '\n':
           break
       if c == '\003':
           raise KeyboardInterrupt
       if c == '\b':
           pw = pw[:-1]
       else:
           pw = pw + c
   msvcrt.putch('\r')
   msvcrt.putch('\n')
   return pw


def default_getpass(prompt='Password: '):
   print "Warning: Problem with getpass. Passwords may be echoed."
   return _raw_input(prompt)


def _raw_input(prompt=""):
   # A raw_input() replacement that doesn't save the string in the
   # GNU readline history.
   prompt = str(prompt)
   if prompt:
       sys.stdout.write(prompt)
   line = sys.stdin.readline()
   if not line:
       raise EOFError
   if line[-1] == '\n':
       line = line[:-1]
   return line


def getuser():
   """Get the username from the environment or password database.

   First try various environment variables, then the password
   database.  This works on Windows as long as USERNAME is set.

   """

   import os

   for name in ('LOGNAME', 'USER', 'LNAME', 'USERNAME'):
       user = os.environ.get(name)
       if user:
           return user

   # If this fails, the exception will "explain" why
   import pwd
   return pwd.getpwuid(os.getuid())[0]

# Bind the name getpass to the appropriate function
try:
   import termios
   # it's possible there is an incompatible termios from the
   # McMillan Installer, make sure we have a UNIX-compatible termios
   termios.tcgetattr, termios.tcsetattr
except (ImportError, AttributeError):
   try:
       import msvcrt
   except ImportError:
       try:
           from EasyDialogs import AskPassword
       except ImportError:
           getpass = default_getpass
       else:
           getpass = AskPassword
   else:
       getpass = win_getpass
else:
   getpass = unix_getpass