1  /* Reading passphrases manually.
       2     Copyright (C) 1991-2023 Free Software Foundation, Inc.
       3  
       4     This program is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU General Public License
       6     as published by the Free Software Foundation; either version 2
       7     of the License, or (at your option) any later version.
       8  
       9     This program is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12     GNU General Public License for more details.
      13  
      14     You should have received a copy of the GNU General Public License
      15     along with this program; if not, see <https://www.gnu.org/licenses/>.
      16  */
      17  
      18  #include <termios.h>
      19  #include <stdio.h>
      20  
      21  ssize_t
      22  my_getpass (char **lineptr, size_t *n, FILE *stream)
      23  {
      24    struct termios old, new;
      25    int nread;
      26  
      27    /* Turn echoing off and fail if we can't.  */
      28    if (tcgetattr (fileno (stream), &old) != 0)
      29      return -1;
      30    new = old;
      31    new.c_lflag &= ~ECHO;
      32    if (tcsetattr (fileno (stream), TCSAFLUSH, &new) != 0)
      33      return -1;
      34  
      35    /* Read the passphrase  */
      36    nread = getline (lineptr, n, stream);
      37  
      38    /* Restore terminal.  */
      39    (void) tcsetattr (fileno (stream), TCSAFLUSH, &old);
      40  
      41    return nread;
      42  }