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/* Copyright (C) 1992,93,94,95,96,97,98,99 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Library General Public License as

   published by the Free Software Foundation; either version 2 of the

   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public

   License along with the GNU C Library; see the file COPYING.LIB.  If not,

   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,

   Boston, MA 02111-1307, USA.  */

#include <stdio.h>

#include <string.h>

#include <termios.h>

#include <unistd.h>

#include <string.h>

/* It is desirable to use this bit on systems that have it.

   The only bit of terminal state we want to twiddle is echoing, which is

   done in software; there is no need to change the state of the terminal

   hardware.  */

#ifndef TCSASOFT

#define TCSASOFT 0

#endif

#define PWD_BUFFER_SIZE 256

char *

getpass (prompt)

     const char *prompt;

{

  FILE *in, *out;

  struct termios s, t;

  int tty_changed;

  static char buf[PWD_BUFFER_SIZE];

  int nread;

  /* Try to write to and read from the terminal if we can.

     If we can't open the terminal, use stderr and stdin.  */

  in = fopen ("/dev/tty", "r+");

  if (in == NULL)

    {

      in = stdin;

      out = stderr;

    }

  else

    out = in;

  /* Turn echoing off if it is on now.  */

  if (tcgetattr (fileno (in), &t) == 0)

    {

      /* Save the old one. */

      s = t;

      /* Tricky, tricky. */

      t.c_lflag &= ~(ECHO|ISIG);

      tty_changed = (tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &t) == 0);

      if (in != stdin) {

        /* Disable buffering for read/write FILE to prevent problems with

         * fseek and buffering for read/write auto-transitioning. */

        setvbuf(in, NULL, _IONBF, 0);

      }

    }

  else

    tty_changed = 0;

  /* Write the prompt.  */

  fputs(prompt, out);

  fflush(out);

  /* Read the password.  */

  fgets (buf, PWD_BUFFER_SIZE-1, in);

  if (buf != NULL)

    {

      nread = strlen(buf);

      if (nread < 0)

        buf[0] = '\0';

      else if (buf[nread - 1] == '\n')

        {

          /* Remove the newline.  */

          buf[nread - 1] = '\0';

          if (tty_changed)

            /* Write the newline that was not echoed.  */

            putc('\n', out);

        }

    }

  /* Restore the original setting.  */

  if (tty_changed) {

    (void) tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &s);

  }

  if (in != stdin)

    /* We opened the terminal; now close it.  */

    fclose (in);

  return buf;

}