Return to tty_settings.c CVS log

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Update ncurses and associated libraries (form, panel, menu) to
6.4-20230826 (from 5.7-20081102).

Based on result from Thomas Dickey's ncu2openbsd script and then
modified. Switches to the upstream tput. Major bump for the ncurses
libraries and for libedit and libreadline.

Help from tb, millert.

ok deraadt sthen

/****************************************************************************
 * Copyright 2020,2021 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 1.1 2023/10/17 09:52:10 nicm 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)) {
	if (need_tty) {
	    int fd = open("/dev/tty", O_RDWR);
	    if (!get_tty_settings(fd, tty_settings)) {
		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);
    }
}