#!/usr/bin/perl -w
use strict;
package GetPassword;
use Carp;
our @ISA =          qw(Exporter);

our $VERSION =      1.001;    
my $get_rid_of_warning = $VERSION;

our @EXPORT =  qw(
              Get_Password
              );

sub Get_Password {
  my $flush = $|;
  $| = 1;  # flush output to screen byte by byte
  
  my $opt = shift || "";
  $opt = substr $opt,0,1;

  my ($bs, $ws, $bullet) = ("\b", " ", $opt);
  ($bs, $ws, $bullet) = ("", "", "") unless $opt;


  my $pass = "";
  while (1) {
    my $ch = getone();
    
    # Return character, end of getting password
    $ch =~ /[\r\n]/ && do {
      print "\n";
      $| = $flush;  # return to previous setting
      return $pass;
    };
    
    # Backspace/delete key entered
    $ch =~ /[\b\x7F]/ && do {
      if (length ($pass) > 0) {
        chop $pass;
        print "$bs$ws$bs";
      }
      next;
    };
    
    # Warn for non-ascii characters
    if (ord($ch) < 32) {
      print "\7";
      next;
    };
    
    # Valid password character enetered
    $pass .= $ch;
    print $bullet;
  }

}


# ============================================================================
# Terminal I/O program to get un-echoed unbuffered input
#
# Take from the Camel Book (3rd edition)
#    (Programming Perl, Larry Wall, O'Reilly), p.906
# ============================================================================
BEGIN {
  use POSIX ":termios_h";
  my ($term, $oterm, $echo, $noecho, $fd_stdin);
  $fd_stdin = fileno(STDIN);
  $term     = POSIX::Termios->new();
  $term->getattr($fd_stdin);
  $oterm    = $term->getlflag();
  $echo     = ECHO | ECHOK | ICANON;
  $noecho   = $oterm & ~$echo;
  sub cbreak {
    $term->setlflag($noecho);
    $term->setcc(VTIME, 1);
    $term->setattr($fd_stdin, TCSANOW);
  }
  sub cooked {
    $term->setlflag($oterm);
    $term->setcc(VTIME,0);
    $term->setattr($fd_stdin, TCSANOW);
  }
  sub getone {
    my $key = "";
    cbreak();
    sysread(STDIN, $key, 1);
    cooked();
    return $key;
  }
  
}
END { cooked() }

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