[Python-bugs-list] [ python-Bugs-546558 ] Windows getpass bug

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Bugs item #546558, was opened at 2002-04-20 18:34
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Category: Windows
Group: Platform-specific
Status: Open
Resolution: None
Priority: 5
Submitted By: Allan Crooks (amc1)
Assigned to: Mark Hammond (mhammond)
Summary: Windows getpass bug

Initial Comment:
I'm currently running Python 2.2.1 on a Windows 98 
box, and this is the code I have just run.

-------

Python 2.2.1 (#34, Apr  9 2002, 19:34:33) [MSC 32 bit 
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for 
more information.
>>> import getpass
>>> def x():
...    secret = getpass.getpass('Tell me a secret: ')
...    stuff = raw_input ('Tell me something else: ')
...    print 'The user told me the secret was "%s" and 
the other thing was "%s"'
 % (secret, stuff)
...
>>> x()
Tell me a secret:
Tell me something else:
The user told me the secret was "Autechre" and the 
other thing was ""
>>>

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This may seem normal, but I didn't get the opportunity 
to enter anything when the raw_input was called. I'm 
assuming that getpass leaves the newline character in 
the input buffer, which is then used by raw_input, 
leaving you unable to enter anything.

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>Comment By: Allan Crooks (amc1)
Date: 2002-09-09 14:05

Message:
Logged In: YES 
user_id=39733

The function getpass_hack in the getpassfix module 
(referenced earlier) is a suitable alternative to the win_getpass 
function in the getpass module, but it should only be used if 
the operating system is Windows 95/98/ME (this is based on 
my observations so far).

If we have a nice Pythonic way of determining what operating 
system that Python is running on (say, by using Marc-Andre 
Lemburg's platform module: 
http://www.lemburg.com/files/python/platform.py), we could 
then provide a straightforward fix.

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Comment By: Allan Crooks (amc1)
Date: 2002-06-11 10:01

Message:
Logged In: YES 
user_id=39733

I've currently written a module which attempts to fix this 
problem, which you can get from here: 
http://ccec.sf.net/getpassfix.html

However, as I've mentioned in the documentation, it is a hack, 
but the "platform" based solution should become a more 
suitable candidate as it is tested.

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Comment By: Tim Peters (tim_one)
Date: 2002-04-20 20:10

Message:
Logged In: YES 
user_id=31435

Assigning to MarkH in case he has a bright idea.  I don't.

The problem is that getpass on Windows is implemented via 
raw Windows console I/O, and console I/O buffers interact 
in strange and undocumented ways with C's stdio buffers.  
I've never found a reliable way to keep them in synch, and 
MS says you can't mix the two, period.  The only workaround 
I know of is to build your own raw_input() workalike out of 
the msvcrt module's console I/O routines (getch(), etc).

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