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[/] [or1k/] [trunk/] [linux/] [uClibc/] [libc/] [unistd/] [getpass.c] - Blame information for rev 1765

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1 1325 phoenix
/* Copyright (C) 1992,93,94,95,96,97,98,99 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Library General Public License as
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   published by the Free Software Foundation; either version 2 of the
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   License, or (at your option) any later version.
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   The GNU C Library is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Library General Public License for more details.
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   You should have received a copy of the GNU Library General Public
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   License along with the GNU C Library; see the file COPYING.LIB.  If not,
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   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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   Boston, MA 02111-1307, USA.  */
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#include <stdio.h>
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#include <string.h>
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#include <termios.h>
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#include <unistd.h>
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#include <string.h>
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/* It is desirable to use this bit on systems that have it.
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   The only bit of terminal state we want to twiddle is echoing, which is
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   done in software; there is no need to change the state of the terminal
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   hardware.  */
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#ifndef TCSASOFT
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#define TCSASOFT 0
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#endif
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#define PWD_BUFFER_SIZE 256
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char *
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getpass (prompt)
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     const char *prompt;
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{
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  FILE *in, *out;
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  struct termios s, t;
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  int tty_changed;
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  static char buf[PWD_BUFFER_SIZE];
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  int nread;
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  /* Try to write to and read from the terminal if we can.
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     If we can't open the terminal, use stderr and stdin.  */
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  in = fopen ("/dev/tty", "r+");
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  if (in == NULL)
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    {
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      in = stdin;
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      out = stderr;
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    }
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  else
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    out = in;
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  /* Turn echoing off if it is on now.  */
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  if (tcgetattr (fileno (in), &t) == 0)
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    {
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      /* Save the old one. */
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      s = t;
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      /* Tricky, tricky. */
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      t.c_lflag &= ~(ECHO|ISIG);
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      tty_changed = (tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &t) == 0);
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      if (in != stdin) {
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        /* Disable buffering for read/write FILE to prevent problems with
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         * fseek and buffering for read/write auto-transitioning. */
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        setvbuf(in, NULL, _IONBF, 0);
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      }
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    }
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  else
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    tty_changed = 0;
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  /* Write the prompt.  */
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  fputs(prompt, out);
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  fflush(out);
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  /* Read the password.  */
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  fgets (buf, PWD_BUFFER_SIZE-1, in);
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  if (buf != NULL)
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    {
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      nread = strlen(buf);
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      if (nread < 0)
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        buf[0] = '\0';
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      else if (buf[nread - 1] == '\n')
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        {
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          /* Remove the newline.  */
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          buf[nread - 1] = '\0';
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          if (tty_changed)
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            /* Write the newline that was not echoed.  */
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            putc('\n', out);
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        }
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    }
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  /* Restore the original setting.  */
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  if (tty_changed) {
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    (void) tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &s);
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  }
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  if (in != stdin)
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    /* We opened the terminal; now close it.  */
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    fclose (in);
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  return buf;
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}

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