/contrib/cvs/lib/getpass.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 111 lines · 66 code · 14 blank · 31 comment · 17 complexity · c2e8cafbabe31efba0838a4921374636 MD5 · raw file
- /* Copyright (C) 1992,93,94,95,96,97,98,99,2000, 2001 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
- This program 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 General Public License for more details.
- You should have received a copy of the GNU General Public License along
- with this program; if not, write to the Free Software Foundation,
- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
- #if HAVE_CONFIG_H
- # include <config.h>
- #endif
- #include <stdio.h>
- #ifndef SEEK_CUR
- #define SEEK_CUR 1
- #endif
- #include <termios.h>
- #include <unistd.h>
- #include "getline.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 *
- #if __STDC__
- getpass (const char *prompt)
- #else
- getpass (prompt)
- const char *prompt;
- #endif
- {
- FILE *in, *out;
- struct termios s, t;
- int tty_changed;
- static char *buf;
- static size_t bufsize;
- 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. */
- if (out == in) fseek (out, 0, SEEK_CUR);
- 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;
- }