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125 lines
3.0 KiB
C
125 lines
3.0 KiB
C
/* Copyright (C) 1992-2017 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdio_ext.h>
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#include <string.h> /* For string function builtin redirect. */
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#include <termios.h>
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#include <unistd.h>
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#include <wchar.h>
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#define flockfile(s) _IO_flockfile (s)
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#define funlockfile(s) _IO_funlockfile (s)
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#include <libc-lock.h>
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/* It is desirable 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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static void
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call_fclose (void *arg)
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{
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if (arg != NULL)
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fclose (arg);
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}
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char *
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getpass (const char *prompt)
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{
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FILE *in, *out;
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struct termios s, t;
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int tty_changed;
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static char *buf;
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static size_t bufsize;
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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+ce");
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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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{
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/* We do the locking ourselves. */
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__fsetlocking (in, FSETLOCKING_BYCALLER);
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out = in;
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}
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/* Make sure the stream we opened is closed even if the thread is
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canceled. */
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__libc_cleanup_push (call_fclose, in == out ? in : NULL);
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flockfile (out);
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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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/* Save the old one. */
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s = t;
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/* Tricky, tricky. */
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t.c_lflag &= ~(ECHO|ISIG);
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tty_changed = (tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &t) == 0);
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}
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else
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tty_changed = 0;
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/* Write the prompt. */
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__fxprintf (out, "%s", prompt);
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__fflush_unlocked (out);
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/* Read the password. */
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nread = __getline (&buf, &bufsize, in);
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if (buf != NULL)
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{
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if (nread < 0)
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buf[0] = '\0';
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else if (buf[nread - 1] == '\n')
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{
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/* Remove the newline. */
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buf[nread - 1] = '\0';
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if (tty_changed)
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/* Write the newline that was not echoed. */
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__fxprintf (out, "\n");
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}
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}
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/* Restore the original setting. */
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if (tty_changed)
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(void) tcsetattr (fileno (in), TCSAFLUSH|TCSASOFT, &s);
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funlockfile (out);
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__libc_cleanup_pop (0);
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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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