From: "James F.Hranicky" <jfh@...>
Date: 2003-08-29T05:25:53+09:00
Subject: Re: Password:

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On Fri, 29 Aug 2003 04:15:03 +0900
mgarriss <mgarriss@earthlink.net> wrote:

> mgarriss wrote:
> 
> > Any easy and elegant way to do the 'no output to the screen' thing for 
> > entering passwords.  I don't want to have to use ncurses.  Also, can I 
> > force stdin to be a tty like 'su' does?
> >
> > Michael 
> 
> 
> I should mention that I'm on a GNU/Linux but it'd be nice to have a 
> cross-platform solution to this.

If the termios module works on windows ( I don't know if it does ), the
attached should work. Either way it should work on Unix (and requires 
termios, obviously).

It defines noecho() and getpass() for IO, and getpass() uses noecho().

Jim
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require 'termios'

class IO
    def noecho
        if ! block_given?
            raise "Block required for noecho()"
        else
            begin
                term = Termios::getattr(self)
                term.c_lflag &= ~Termios::ECHO
                Termios::setattr(self, Termios::TCSANOW, term)
                yield self
            ensure
                term.c_lflag |= Termios::ECHO
                Termios::setattr(self, Termios::TCSANOW, term)
            end
        end
    end

    def getpass(prompt)
        stderr_sync = STDERR.sync
        STDERR.sync = 1

        STDERR.print(prompt)
        pw = nil

        noecho { |s|
            pw = s.gets.chomp
        }
        STDERR.puts
        STDERR.sync = 0 unless stderr_sync
        return pw
    end
end

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