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/*
* Copyright 1990 - 1995, Julianne Frances Haugh
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <signal.h>
#include <stdio.h>
#include "t_defines.h"
static int sig_caught;
#ifdef HAVE_SIGACTION
static struct sigaction sigact;
#endif
/*ARGSUSED*/
static RETSIGTYPE
sig_catch (sig)
int sig;
{
sig_caught = 1;
}
int
t_getpass (buf, maxlen, prompt)
char *buf;
unsigned maxlen;
const char *prompt;
{
char *return_value = 0;
char *cp;
FILE *fp;
int tty_opened = 0;
#ifdef HAVE_SIGACTION
struct sigaction old_sigact;
#else
RETSIGTYPE (*old_signal)();
#endif
TERMIO new_modes;
TERMIO old_modes;
/*
* set a flag so the SIGINT signal can be re-sent if it
* is caught
*/
sig_caught = 0;
/*
* if /dev/tty can't be opened, getpass() needs to read
* from stdin instead.
*/
if ((fp = fopen ("/dev/tty", "r")) == 0) {
fp = stdin;
setbuf (fp, (char *) 0);
} else {
tty_opened = 1;
}
/*
* the current tty modes must be saved so they can be
* restored later on. echo will be turned off, except
* for the newline character (BSD has to punt on this)
*/
if (GTTY (fileno (fp), &new_modes))
return -1;
old_modes = new_modes;
#ifdef HAVE_SIGACTION
sigact.sa_handler = sig_catch;
(void) sigaction (SIGINT, &sigact, &old_sigact);
#else
old_signal = signal (SIGINT, sig_catch);
#endif
#ifdef USE_SGTTY
new_modes.sg_flags &= ~ECHO;
#else
new_modes.c_lflag &= ~(ECHO|ECHOE|ECHOK);
new_modes.c_lflag |= ECHONL;
#endif
if (STTY (fileno (fp), &new_modes))
goto out;
/*
* the prompt is output, and the response read without
* echoing. the trailing newline must be removed. if
* the fgets() returns an error, a NULL pointer is
* returned.
*/
if (fputs (prompt, stdout) == EOF)
goto out;
(void) fflush (stdout);
if (fgets (buf, maxlen, fp) == buf) {
if ((cp = strchr (buf, '\n')))
*cp = '\0';
else
buf[maxlen - 1] = '\0';
#ifdef USE_SGTTY
putc ('\n', stdout);
#endif
}
else buf[0] = '\0';
out:
/*
* the old SIGINT handler is restored after the tty
* modes. then /dev/tty is closed if it was opened in
* the beginning. finally, if a signal was caught it
* is sent to this process for normal processing.
*/
if (STTY (fileno (fp), &old_modes))
{ memset (buf, 0, maxlen); return -1; }
#ifdef HAVE_SIGACTION
(void) sigaction (SIGINT, &old_sigact, NULL);
#else
(void) signal (SIGINT, old_signal);
#endif
if (tty_opened)
(void) fclose (fp);
if (sig_caught) {
kill (getpid (), SIGINT);
memset (buf, 0, maxlen);
return -1;
}
return 0;
}
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