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/****************************************************************************
* Copyright 2020 Thomas E. Dickey *
* Copyright 2016,2017 Free Software Foundation, Inc. *
* *
* Permission is hereby granted, free of charge, to any person obtaining a *
* copy of this software and associated documentation files (the *
* "Software"), to deal in the Software without restriction, including *
* without limitation the rights to use, copy, modify, merge, publish, *
* distribute, distribute with modifications, sublicense, and/or sell *
* copies of the Software, and to permit persons to whom the Software is *
* furnished to do so, subject to the following conditions: *
* *
* The above copyright notice and this permission notice shall be included *
* in all copies or substantial portions of the Software. *
* *
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
* *
* Except as contained in this notice, the name(s) of the above copyright *
* holders shall not be used in advertising or otherwise to promote the *
* sale, use or other dealings in this Software without prior written *
* authorization. *
****************************************************************************/
/****************************************************************************
* Author: Thomas E. Dickey *
****************************************************************************/
#define USE_LIBTINFO
#include <tty_settings.h>
#include <fcntl.h>
MODULE_ID("$Id: tty_settings.c,v 1.6 2020/02/02 23:34:34 tom Exp $")
static int my_fd;
static TTY original_settings;
static bool can_restore = FALSE;
static void
failed(const char *msg)
{
int code = errno;
(void) fprintf(stderr, "%s: %s: %s\n", _nc_progname, msg, strerror(code));
restore_tty_settings();
(void) fprintf(stderr, "\n");
ExitProgram(ErrSystem(code));
/* NOTREACHED */
}
static bool
get_tty_settings(int fd, TTY * tty_settings)
{
bool success = TRUE;
my_fd = fd;
if (fd < 0 || GET_TTY(my_fd, tty_settings) < 0) {
success = FALSE;
}
return success;
}
/*
* Open a file descriptor on the current terminal, to obtain its settings.
* stderr is less likely to be redirected than stdout; try that first.
*/
int
save_tty_settings(TTY * tty_settings, bool need_tty)
{
if (!get_tty_settings(STDERR_FILENO, tty_settings) &&
!get_tty_settings(STDOUT_FILENO, tty_settings) &&
!get_tty_settings(STDIN_FILENO, tty_settings) &&
!get_tty_settings(open("/dev/tty", O_RDWR), tty_settings)) {
if (need_tty) {
failed("terminal attributes");
} else {
my_fd = fileno(stdout);
}
} else {
can_restore = TRUE;
original_settings = *tty_settings;
}
return my_fd;
}
void
restore_tty_settings(void)
{
if (can_restore)
SET_TTY(my_fd, &original_settings);
}
/* Set the modes if they've changed. */
void
update_tty_settings(TTY * old_settings, TTY * new_settings)
{
if (memcmp(new_settings, old_settings, sizeof(TTY))) {
SET_TTY(my_fd, new_settings);
}
}
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