| /* Copyright (C) 1992, 93, 94, 95, 96, 97 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 <termios.h> |
| #include <unistd.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 |
| |
| char * |
| getpass (prompt) |
| const char *prompt; |
| { |
| FILE *in, *out; |
| struct termios s, t; |
| int tty_changed; |
| static char *buf = NULL; |
| static size_t bufsize = 0; |
| ssize_t 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", "w+"); |
| 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); |
| } |
| else |
| tty_changed = 0; |
| |
| /* Write the prompt. */ |
| fputs (prompt, out); |
| fflush (out); |
| |
| /* Read the password. */ |
| nread = __getline (&buf, &bufsize, in); |
| if (buf != NULL) |
| 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; |
| } |