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93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
/* Copyright (C) 1992, 1993, 1994 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
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include <termios.h>
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#include <unistd.h>
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/* It is desireable 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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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 t;
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int echo_off;
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static char *buf = NULL;
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static size_t bufsize = 0;
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ssize_t 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", "w+");
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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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if (t.c_lflag & ECHO)
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{
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t.c_lflag &= ~ECHO;
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echo_off = tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &t) == 0;
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t.c_lflag |= ECHO;
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}
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else
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echo_off = 0;
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}
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else
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echo_off = 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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nread = __getline (&buf, &bufsize, in);
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if (nread < 0 && buf != NULL)
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buf[0] = '\0';
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else if (buf[nread - 1] == '\n')
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/* Remove the newline. */
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buf[nread - 1] = '\0';
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/* Restore echoing. */
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if (echo_off)
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(void) tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &t);
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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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