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/* Copyright (C) 1992-2001, 2003, 2004 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
#if !_LIBC
# include "getpass.h"
#endif
#if _LIBC
# define HAVE_STDIO_EXT_H 1
#endif
#include <stdbool.h>
#include <stdio.h>
#if HAVE_STDIO_EXT_H
# include <stdio_ext.h>
#else
# define __fsetlocking(stream, type) /* empty */
#endif
#if !_LIBC
# include "getline.h"
#endif
#include <termios.h>
#include <unistd.h>
#if _LIBC
# include <wchar.h>
#endif
#if _LIBC
# define NOTCANCEL_MODE "c"
#else
# define NOTCANCEL_MODE
#endif
#if _LIBC
# define flockfile(s) _IO_flockfile (s)
# define funlockfile(s) _IO_funlockfile (s)
#elif USE_UNLOCKED_IO
# include "unlocked-io.h"
#else
# if !HAVE_DECL_FFLUSH_UNLOCKED
# undef fflush_unlocked
# define fflush_unlocked(x) fflush (x)
# endif
# if !HAVE_DECL_FLOCKFILE
# undef flockfile
# define flockfile(x) ((void) 0)
# endif
# if !HAVE_DECL_FUNLOCKFILE
# undef funlockfile
# define funlockfile(x) ((void) 0)
# endif
# if !HAVE_DECL_FPUTS_UNLOCKED
# undef fputs_unlocked
# define fputs_unlocked(str,stream) fputs (str, stream)
# endif
# if !HAVE_DECL_PUTC_UNLOCKED
# undef putc_unlocked
# define putc_unlocked(c,stream) putc (c, stream)
# endif
#endif
#if _LIBC
# include <bits/libc-lock.h>
#else
# define __libc_cleanup_push(function, arg) /* empty */
# define __libc_cleanup_pop(execute) /* empty */
#endif
#if !_LIBC
# define __getline getline
# define __tcgetattr tcgetattr
#endif
/* 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
static void
call_fclose (void *arg)
{
if (arg != NULL)
fclose (arg);
}
char *
getpass (const char *prompt)
{
FILE *tty;
FILE *in, *out;
struct termios s, t;
bool 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. */
tty = fopen ("/dev/tty", "w+" NOTCANCEL_MODE);
if (tty == NULL)
{
in = stdin;
out = stderr;
}
else
{
/* We do the locking ourselves. */
__fsetlocking (tty, FSETLOCKING_BYCALLER);
out = in = tty;
}
/* Make sure the stream we opened is closed even if the thread is
canceled. */
__libc_cleanup_push (call_fclose, tty);
flockfile (out);
/* 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 = false;
/* Write the prompt. */
#ifdef USE_IN_LIBIO
if (_IO_fwide (out, 0) > 0)
__fwprintf (out, L"%s", prompt);
else
#endif
fputs_unlocked (prompt, out);
fflush_unlocked (out);
/* Read the password. */
nread = __getline (&buf, &bufsize, in);
#if !_LIBC
/* As far as is known, glibc doesn't need this no-op fseek. */
/* According to the C standard, input may not be followed by output
on the same stream without an intervening call to a file
positioning function. Suppose in == out; then without this fseek
call, on Solaris, HP-UX, AIX, OSF/1, the previous input gets
echoed, whereas on IRIX, the following newline is not output as
it should be. POSIX imposes similar restrictions if fileno (in)
== fileno (out). The POSIX restrictions are tricky and change
from POSIX version to POSIX version, so play it safe and invoke
fseek even if in != out. */
fseek (out, 0, SEEK_CUR);
#endif
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. */
#ifdef USE_IN_LIBIO
if (_IO_fwide (out, 0) > 0)
putwc_unlocked (L'\n', out);
else
#endif
putc_unlocked ('\n', out);
}
}
}
/* Restore the original setting. */
if (tty_changed)
(void) tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &s);
funlockfile (out);
__libc_cleanup_pop (0);
call_fclose (tty);
return buf;
}
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