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/* Copyright (C) 1992-1999,2001,2003,2004,2005 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <malloc.h>
#if defined __USE_BSD || (defined __USE_XOPEN && !defined __USE_XOPEN2K)
/* 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
#define PWD_BUFFER_SIZE 256
char * getpass (const char *prompt)
{
FILE *in, *out;
struct termios s, t;
int tty_changed;
static char *buf = NULL;
int nread;
if (buf == NULL)
buf = (char *)__uc_malloc(PWD_BUFFER_SIZE);
/* Try to write to and read from the terminal if we can.
If we can't open the terminal, use stderr and stdin. */
out = in = fopen ("/dev/tty", "r+");
if (in == NULL)
{
in = stdin;
out = stderr;
}
else
{
/* Disable buffering for read/write FILE to prevent problems with
* fseek and buffering for read/write auto-transitioning. */
setvbuf(in, NULL, _IONBF, 0);
}
/* Turn echoing off if it is on now. */
tty_changed = 0;
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);
}
/* Write the prompt. */
fputs(prompt, out);
fflush(out);
/* Read the password. */
if (!fgets (buf, PWD_BUFFER_SIZE, in))
buf[0] = '\0';
nread = strlen(buf);
if (nread > 0 && 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. */
(void) tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &s);
}
if (in != stdin)
/* We opened the terminal; now close it. */
fclose (in);
return buf;
}
#endif
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