/*      $NetBSD: tty.c,v 1.51 2024/12/23 02:58:04 blymn Exp $   */

/*-
 * Copyright (c) 1992, 1993, 1994
 *      The Regents of the University of California.  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 the University 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 THE REGENTS 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 THE REGENTS 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 <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)tty.c       8.6 (Berkeley) 1/10/95";
#else
__RCSID("$NetBSD: tty.c,v 1.51 2024/12/23 02:58:04 blymn Exp $");
#endif
#endif                          /* not lint */

#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/types.h>

#include <stdlib.h>
#include <termios.h>
#include <unistd.h>

#include "curses.h"
#include "curses_private.h"

/*
 * In general, curses should leave tty hardware settings alone (speed, parity,
 * word size).  This is most easily done in BSD by using TCSASOFT on all
 * tcsetattr calls.  On other systems, it would be better to get and restore
 * those attributes at each change, or at least when stopped and restarted.
 * See also the comments in getterm().
 */
#ifndef TCSASOFT
#define TCSASOFT        0
#endif

int __tcaction = TCSASOFT != 0;         /* Ignore hardware settings */

#ifndef OXTABS
#ifdef  XTABS                   /* SMI uses XTABS. */
#define OXTABS  XTABS
#else
#define OXTABS  0
#endif
#endif

/*
 * baudrate --
 *      Return the current baudrate
 */
int
baudrate(void)
{

        if (_cursesi_screen->notty == TRUE)
                return 0;

        return cfgetospeed(&_cursesi_screen->baset);
}

/*
 * gettmode --
 *      Do terminal type initialization.
 */
int
gettmode(void)
{

        if (_cursesi_gettmode(_cursesi_screen) == ERR)
                return ERR;

        __GT = _cursesi_screen->GT;
        __NONL = _cursesi_screen->NONL;
        return OK;
}

/*
 * _cursesi_gettmode --
 *      Do the terminal type initialisation for the tty attached to the
 *  given screen.
 */
int
_cursesi_gettmode(SCREEN *screen)
{
        screen->useraw = 0;

        if (tcgetattr(fileno(screen->infd), &screen->orig_termios)) {
                /* if the input fd is not a tty try the output */
                if (tcgetattr(fileno(screen->outfd), &screen->orig_termios)) {
                        /* not a tty ... we will disable tty related stuff */
                        screen->notty = TRUE;
                        __GT = 0;
                        __NONL = 0;
                        return OK;
                }
        }

        screen->baset = screen->orig_termios;
        screen->baset.c_oflag &= ~OXTABS;

        screen->GT = 0; /* historical. was used before we wired OXTABS off */
        screen->NONL = (screen->baset.c_oflag & ONLCR) == 0;

        /*
         * XXX
         * System V and SMI systems overload VMIN and VTIME, such that
         * VMIN is the same as the VEOF element, and VTIME is the same
         * as the VEOL element.  This means that, if VEOF was ^D, the
         * default VMIN is 4.  Majorly stupid.
         */
        screen->cbreakt = screen->baset;
        screen->cbreakt.c_lflag &= ~(ECHO | ECHONL | ICANON);
        screen->cbreakt.c_cc[VMIN] = 1;
        screen->cbreakt.c_cc[VTIME] = 0;

        screen->rawt = screen->cbreakt;
        screen->rawt.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | INLCR | IGNCR |
                                  ICRNL | IXON);
        screen->rawt.c_oflag &= ~OPOST;
        screen->rawt.c_lflag &= ~(ISIG | IEXTEN);

#if TCSASOFT == 0
        /*
         * In general, curses should leave hardware-related settings alone.
         * This includes parity and word size.  Older versions set the tty
         * to 8 bits, no parity in raw(), but this is considered to be an
         * artifact of the old tty interface.  If it's desired to change
         * parity and word size, the TCSASOFT bit has to be removed from the
         * calls that switch to/from "raw" mode.
         */
        screen->rawt.c_iflag &= ~ISTRIP;
        screen->rawt.c_cflag &= ~(CSIZE | PARENB);
        screen->rawt.c_cflag |= CS8;
#endif

        screen->curt = &screen->baset;
        return tcsetattr(fileno(screen->infd), TCSASOFT | TCSADRAIN,
            screen->curt) ? ERR : OK;
}

/*
 * raw --
 *      Put the terminal into raw mode
 */
int
raw(void)
{
        __CTRACE(__CTRACE_MISC, "raw()\n");
        /* Check if we need to restart ... */
        if (_cursesi_screen->endwin)
                __restartwin();

        _cursesi_screen->useraw = __pfast = __rawmode = 1;
        _cursesi_screen->curt = &_cursesi_screen->rawt;
        if (_cursesi_screen->notty == TRUE)
                return OK;
        return tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSADRAIN,
            _cursesi_screen->curt) ? ERR : OK;
}

/*
 * noraw --
 *      Put the terminal into cooked mode
 */
int
noraw(void)
{
        __CTRACE(__CTRACE_MISC, "noraw()\n");
        /* Check if we need to restart ... */
        if (_cursesi_screen->endwin)
                __restartwin();

        _cursesi_screen->useraw = __pfast = __rawmode = 0;
        if (_cursesi_screen->notty == TRUE)
                return OK;
        _cursesi_screen->curt = &_cursesi_screen->baset;
        return tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSADRAIN,
            _cursesi_screen->curt) ? ERR : OK;
}

/*
 * cbreak --
 *      Enable cbreak mode
 */
int
cbreak(void)
{
        __CTRACE(__CTRACE_MISC, "cbreak()\n");
        /* Check if we need to restart ... */
        if (_cursesi_screen->endwin)
                __restartwin();

        __rawmode = 1;
        if (_cursesi_screen->notty == TRUE)
                return OK;
        _cursesi_screen->curt = _cursesi_screen->useraw ?
                &_cursesi_screen->rawt : &_cursesi_screen->cbreakt;
        return tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSADRAIN,
            _cursesi_screen->curt) ? ERR : OK;
}

/*
 * nocbreak --
 *      Disable cbreak mode
 */
int
nocbreak(void)
{
        __CTRACE(__CTRACE_MISC, "nocbreak()\n");
        /* Check if we need to restart ... */
        if (_cursesi_screen->endwin)
                __restartwin();

        __rawmode = 0;
        if (_cursesi_screen->notty == TRUE)
                return OK;
          /* if we were in halfdelay mode then nuke the timeout */
        if ((stdscr->flags & __HALFDELAY) &&
            (__notimeout() == ERR))
                return ERR;

        stdscr->flags &= ~__HALFDELAY;
        _cursesi_screen->curt = _cursesi_screen->useraw ?
                &_cursesi_screen->rawt : &_cursesi_screen->baset;
        return tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSADRAIN,
            _cursesi_screen->curt) ? ERR : OK;
}

/*
 * halfdelay --
 *    Put the terminal into cbreak mode with the specified timeout.
 *
 */
int
halfdelay(int duration)
{
        if ((duration < 1) || (duration > 255))
                return ERR;

        if (cbreak() == ERR)
                return ERR;

        if (duration > 255)
                stdscr->delay = 255;
        else
                stdscr->delay = duration;

        stdscr->flags |= __HALFDELAY;
        return OK;
}

int
__delay(void)
 {
        __CTRACE(__CTRACE_MISC, "__delay()\n");
        /* Check if we need to restart ... */
        if (_cursesi_screen->endwin)
                __restartwin();

        if (_cursesi_screen->notty == TRUE)
                return OK;
        _cursesi_screen->rawt.c_cc[VMIN] = 1;
        _cursesi_screen->rawt.c_cc[VTIME] = 0;
        _cursesi_screen->cbreakt.c_cc[VMIN] = 1;
        _cursesi_screen->cbreakt.c_cc[VTIME] = 0;
        _cursesi_screen->baset.c_cc[VMIN] = 1;
        _cursesi_screen->baset.c_cc[VTIME] = 0;

        if (tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSANOW, 
            _cursesi_screen->curt)) {
                __restore_termios();
                return ERR;
        }

        return OK;
}

int
__nodelay(void)
{
        __CTRACE(__CTRACE_MISC, "__nodelay()\n");
        /* Check if we need to restart ... */
        if (_cursesi_screen->endwin)
                __restartwin();

        if (_cursesi_screen->notty == TRUE)
                return OK;
        _cursesi_screen->rawt.c_cc[VMIN] = 0;
        _cursesi_screen->rawt.c_cc[VTIME] = 0;
        _cursesi_screen->cbreakt.c_cc[VMIN] = 0;
        _cursesi_screen->cbreakt.c_cc[VTIME] = 0;
        _cursesi_screen->baset.c_cc[VMIN] = 0;
        _cursesi_screen->baset.c_cc[VTIME] = 0;

        if (tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSANOW,
            _cursesi_screen->curt)) {
                __restore_termios();
                return ERR;
        }

        return OK;
}

void
__save_termios(void)
{
        /* Check if we need to restart ... */
        if (_cursesi_screen->endwin)
                __restartwin();

        if (_cursesi_screen->notty == TRUE)
                return;
        _cursesi_screen->ovmin = _cursesi_screen->cbreakt.c_cc[VMIN];
        _cursesi_screen->ovtime = _cursesi_screen->cbreakt.c_cc[VTIME];
}

void
__restore_termios(void)
{
        /* Check if we need to restart ... */
        if (_cursesi_screen->endwin)
                __restartwin();

        if (_cursesi_screen->notty == TRUE)
                return;
        _cursesi_screen->rawt.c_cc[VMIN] = _cursesi_screen->ovmin;
        _cursesi_screen->rawt.c_cc[VTIME] = _cursesi_screen->ovtime;
        _cursesi_screen->cbreakt.c_cc[VMIN] = _cursesi_screen->ovmin;
        _cursesi_screen->cbreakt.c_cc[VTIME] = _cursesi_screen->ovtime;
        _cursesi_screen->baset.c_cc[VMIN] = _cursesi_screen->ovmin;
        _cursesi_screen->baset.c_cc[VTIME] = _cursesi_screen->ovtime;
}

int
__timeout(int delay)
{
        __CTRACE(__CTRACE_MISC, "__timeout()\n");
        /* Check if we need to restart ... */
        if (_cursesi_screen->endwin)
                __restartwin();

        if (_cursesi_screen->notty == TRUE)
                return OK;
        _cursesi_screen->ovmin = _cursesi_screen->cbreakt.c_cc[VMIN];
        _cursesi_screen->ovtime = _cursesi_screen->cbreakt.c_cc[VTIME];
        _cursesi_screen->rawt.c_cc[VMIN] = 0;
        _cursesi_screen->rawt.c_cc[VTIME] = delay;
        _cursesi_screen->cbreakt.c_cc[VMIN] = 0;
        _cursesi_screen->cbreakt.c_cc[VTIME] = delay;
        _cursesi_screen->baset.c_cc[VMIN] = 0;
        _cursesi_screen->baset.c_cc[VTIME] = delay;

        if (tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSANOW,
            _cursesi_screen->curt)) {
                __restore_termios();
                return ERR;
        }

        return OK;
}

int
__notimeout(void)
{
        __CTRACE(__CTRACE_MISC, "__notimeout()\n");
        /* Check if we need to restart ... */
        if (_cursesi_screen->endwin)
                __restartwin();

        if (_cursesi_screen->notty == TRUE)
                return OK;
        _cursesi_screen->rawt.c_cc[VMIN] = 1;
        _cursesi_screen->rawt.c_cc[VTIME] = 0;
        _cursesi_screen->cbreakt.c_cc[VMIN] = 1;
        _cursesi_screen->cbreakt.c_cc[VTIME] = 0;
        _cursesi_screen->baset.c_cc[VMIN] = 1;
        _cursesi_screen->baset.c_cc[VTIME] = 0;

        return tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSANOW,
            _cursesi_screen->curt) ? ERR : OK;
}

int
echo(void)
{
        __CTRACE(__CTRACE_MISC, "echo()\n");
        /* Check if we need to restart ... */
        if (_cursesi_screen->endwin)
                __restartwin();

        __echoit = 1;
        return OK;
}

int
noecho(void)
{
        __CTRACE(__CTRACE_MISC, "noecho()\n");
        /* Check if we need to restart ... */
        if (_cursesi_screen->endwin)
                __restartwin();

        __echoit = 0;
        return OK;
}

int
nl(void)
{
        __CTRACE(__CTRACE_MISC, "nl()\n");
        /* Check if we need to restart ... */
        if (_cursesi_screen->endwin)
                __restartwin();

        if (_cursesi_screen->notty == TRUE)
                return OK;
        _cursesi_screen->rawt.c_iflag |= ICRNL;
        _cursesi_screen->rawt.c_oflag |= ONLCR;
        _cursesi_screen->cbreakt.c_iflag |= ICRNL;
        _cursesi_screen->cbreakt.c_oflag |= ONLCR;
        _cursesi_screen->baset.c_iflag |= ICRNL;
        _cursesi_screen->baset.c_oflag |= ONLCR;

        _cursesi_screen->nl = 1;
        _cursesi_screen->pfast = _cursesi_screen->rawmode;
        return tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSADRAIN,
            _cursesi_screen->curt) ? ERR : OK;
}

int
nonl(void)
{
        __CTRACE(__CTRACE_MISC, "nonl()\n");
        /* Check if we need to restart ... */
        if (_cursesi_screen->endwin)
                __restartwin();

        if (_cursesi_screen->notty == TRUE)
                return OK;
        _cursesi_screen->rawt.c_iflag &= ~ICRNL;
        _cursesi_screen->rawt.c_oflag &= ~ONLCR;
        _cursesi_screen->cbreakt.c_iflag &= ~ICRNL;
        _cursesi_screen->cbreakt.c_oflag &= ~ONLCR;
        _cursesi_screen->baset.c_iflag &= ~ICRNL;
        _cursesi_screen->baset.c_oflag &= ~ONLCR;

        _cursesi_screen->nl = 0;
        __pfast = 1;
        return tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSADRAIN,
            _cursesi_screen->curt) ? ERR : OK;
}

#ifndef _CURSES_USE_MACROS
void
noqiflush(void)
{

        (void)intrflush(stdscr, FALSE);
}

void
qiflush(void)
{

        (void)intrflush(stdscr, TRUE);
}
#endif  /* _CURSES_USE_MACROS */

/*ARGSUSED*/
int
intrflush(WINDOW *win, bool bf)
{
        if (__predict_false(win == NULL))
                return ERR;

        /* Check if we need to restart ... */
        if (_cursesi_screen->endwin)
                __restartwin();

        if (_cursesi_screen->notty == TRUE)
                return OK;
        if (bf) {
                _cursesi_screen->rawt.c_lflag &= ~NOFLSH;
                _cursesi_screen->cbreakt.c_lflag &= ~NOFLSH;
                _cursesi_screen->baset.c_lflag &= ~NOFLSH;
        } else {
                _cursesi_screen->rawt.c_lflag |= NOFLSH;
                _cursesi_screen->cbreakt.c_lflag |= NOFLSH;
                _cursesi_screen->baset.c_lflag |= NOFLSH;
        }

        __pfast = 1;
        return tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSADRAIN,
            _cursesi_screen->curt) ? ERR : OK;
}

void
__startwin(SCREEN *screen)
{

        (void)fflush(screen->infd);

#ifdef BSD
        /*
         * Some C libraries default to a 1K buffer when talking to a tty.
         * With a larger screen, especially across a network, we'd like
         * to get it to all flush in a single write.  Make it twice as big
         * as just the characters (so that we have room for cursor motions
         * and attribute information) but no more than 8K.
         *
         * However, setvbuf may only be used after opening a stream and
         * before any operations have been performed on it.
         * This means we cannot work portably if an application wants
         * to stop curses and start curses after a resize.
         * Curses resizing is not standard, and thus not strictly portable
         * even though all curses today support it.
         * The BSD systems do not suffer from this limitation on setvbuf.
         */
        if (screen->stdbuf == NULL) {
                screen->len = LINES * COLS * 2;
                if (screen->len > 8192)
                        screen->len = 8192;
                if ((screen->stdbuf = malloc(screen->len)) == NULL)
                        screen->len = 0;
        }
        (void)setvbuf(screen->outfd, screen->stdbuf, _IOFBF, screen->len);
#endif

        ti_puts(screen->term, t_enter_ca_mode(screen->term), 0,
                __cputchar_args, (void *) screen->outfd);
        ti_puts(screen->term, t_cursor_normal(screen->term), 0,
            __cputchar_args, (void *) screen->outfd);
        if (screen->curscr->flags & __KEYPAD)
                ti_puts(screen->term, t_keypad_xmit(screen->term), 0,
                    __cputchar_args, (void *) screen->outfd);
        screen->endwin = 0;
}

int
endwin(void)
{
        __CTRACE(__CTRACE_MISC, "endwin\n");
        return __stopwin();
}

bool
isendwin(void)
{

        return _cursesi_screen->endwin ? TRUE : FALSE;
}

int
flushinp(void)
{

        (void)fpurge(_cursesi_screen->infd);
        return OK;
}

/*
 * The following routines, savetty and resetty are completely useless and
 * are left in only as stubs.  If people actually use them they will almost
 * certainly screw up the state of the world.
 */
/*static struct termios savedtty;*/
int
savetty(void)
{

        if (_cursesi_screen->notty == TRUE)
                return OK;
        return tcgetattr(fileno(_cursesi_screen->infd),
                         &_cursesi_screen->savedtty) ? ERR : OK;
}

int
resetty(void)
{

        if (_cursesi_screen->notty == TRUE)
                return OK;
        return tcsetattr(fileno(_cursesi_screen->infd), TCSASOFT | TCSADRAIN,
                         &_cursesi_screen->savedtty) ? ERR : OK;
}

/*
 * erasechar --
 *     Return the character of the erase key.
 */
char
erasechar(void)
{

        if (_cursesi_screen->notty == TRUE)
                return 0;
        return _cursesi_screen->baset.c_cc[VERASE];
}

/*
 * killchar --
 *     Return the character of the kill key.
 */
char
killchar(void)
{

        if (_cursesi_screen->notty == TRUE)
                return 0;
        return _cursesi_screen->baset.c_cc[VKILL];
}

/*
 * erasewchar --
 *     Return the wide character of the erase key.
 */
int
erasewchar(wchar_t *ch)
{

#ifndef HAVE_WCHAR
        return ERR;
#else
        if (_cursesi_screen->notty == TRUE)
                return ERR;
        *ch = _cursesi_screen->baset.c_cc[VERASE];
        return OK;
#endif /* HAVE_WCHAR */
}

/*
 * killwchar --
 *     Return the wide character of the kill key.
 */
int
killwchar( wchar_t *ch )
{

#ifndef HAVE_WCHAR
        return ERR;
#else
        if (_cursesi_screen->notty == TRUE)
                return 0;
        *ch = _cursesi_screen->baset.c_cc[VKILL];
        return OK;
#endif /* HAVE_WCHAR */
}

int
typeahead(int filedes)
{

        _cursesi_screen->checkfd = filedes;
        return OK;
}