/*      $NetBSD: ttcompat.c,v 1.12 2003/08/07 11:25:28 agc Exp $        */
/*
 * Copyright (c) 1995
 *      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.
 */

/*
 * ttcompat.c -- convert sgtty flags to termios
 *      originally from /sys/kern/tty_compat.c
 */

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

#include <unistd.h>
#include <sys/ioctl_compat.h>
#include <termios.h>
#include <syslog.h>
#include <fcntl.h>
#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "extern.h"

/* Macros to clear/set/test flags. */
#define SET(t, f)       (t) |= (f)
#define CLR(t, f)       (t) &= ~(f)
#define ISSET(t, f)     ((t) & (f))

static int      sttygetoflags(struct termios *);
static void     sttysetoflags(struct termios *, int);

static int
sttygetoflags(struct termios *tp)
{
        tcflag_t iflag = tp->c_iflag;
        tcflag_t lflag = tp->c_lflag;
        tcflag_t oflag = tp->c_oflag;
        tcflag_t cflag = tp->c_cflag;
        int flags = 0;

        if (ISSET(cflag, PARENB)) {
                if (ISSET(iflag, INPCK)) {
                        if (ISSET(cflag, PARODD))
                                SET(flags, ODDP);
                        else
                                SET(flags, EVENP);
                } else
                        SET(flags, EVENP|ODDP);
        }
        if (ISSET(cflag, CSIZE) == CS8) {
                if (!ISSET(iflag, ISTRIP))
                        SET(flags, PASS8);
                if (!ISSET(oflag, OPOST))
                        SET(flags, LITOUT);
        }

        if (!ISSET(lflag, ICANON)) {
                /* fudge */
                if (ISSET(iflag, IXON) || ISSET(lflag, ISIG|IEXTEN) ||
                    ISSET(cflag, PARENB))
                        SET(flags, CBREAK);
                else
                        SET(flags, RAW);
        }

        return (flags);
}

static void
sttysetoflags(struct termios *tp, int flags)
{
        tcflag_t iflag = tp->c_iflag;
        tcflag_t oflag = tp->c_oflag;
        tcflag_t lflag = tp->c_lflag;
        tcflag_t cflag = tp->c_cflag;

        if (ISSET(flags, RAW)) {
                iflag &= IXOFF;
                CLR(lflag, ISIG|ICANON|IEXTEN);
                CLR(cflag, PARENB);
        } else {
                SET(iflag, BRKINT|IXON|IMAXBEL);
                SET(lflag, ISIG|IEXTEN);
                if (ISSET(flags, CBREAK))
                        CLR(lflag, ICANON);
                else
                        SET(lflag, ICANON);
                switch (ISSET(flags, ANYP)) {
                case 0:
                        CLR(cflag, PARENB);
                        break;
                case ANYP:
                        SET(cflag, PARENB);
                        CLR(iflag, INPCK);
                        break;
                case EVENP:
                        SET(cflag, PARENB);
                        SET(iflag, INPCK);
                        CLR(cflag, PARODD);
                        break;
                case ODDP:
                        SET(cflag, PARENB);
                        SET(iflag, INPCK);
                        SET(cflag, PARODD);
                        break;
                }
        }

        if (ISSET(flags, RAW|LITOUT|PASS8)) {
                CLR(cflag, CSIZE);
                SET(cflag, CS8);
                if (!ISSET(flags, RAW|PASS8))
                        SET(iflag, ISTRIP);
                else
                        CLR(iflag, ISTRIP);
                if (!ISSET(flags, RAW|LITOUT))
                        SET(oflag, OPOST);
                else
                        CLR(oflag, OPOST);
        } else {
                CLR(cflag, CSIZE);
                SET(cflag, CS7);
                SET(iflag, ISTRIP);
                SET(oflag, OPOST);
        }

        tp->c_iflag = iflag;
        tp->c_oflag = oflag;
        tp->c_lflag = lflag;
        tp->c_cflag = cflag;
}

void
sttyclearflags(struct termios *tp, int flags)
{
        tcflag_t iflag = tp->c_iflag;
        tcflag_t oflag = tp->c_oflag;
        tcflag_t lflag = tp->c_lflag;
        tcflag_t cflag = tp->c_cflag;
        int oflags = sttygetoflags(tp) & ~flags;

        if (ISSET(flags, TANDEM))
                CLR(iflag, IXOFF);
        if (ISSET(flags, ECHO))
                CLR(lflag, ECHO);
        if (ISSET(flags, CRMOD)) {
                CLR(iflag, ICRNL);
                CLR(oflag, ONLCR);
        }
        if (ISSET(flags, XTABS))
                CLR(oflag, OXTABS);


        tp->c_iflag = iflag;
        tp->c_oflag = oflag;
        tp->c_lflag = lflag;
        tp->c_cflag = cflag;

        sttysetoflags(tp, oflags);
}

void
sttysetflags(struct termios *tp, int flags)
{
        tcflag_t iflag = tp->c_iflag;
        tcflag_t oflag = tp->c_oflag;
        tcflag_t lflag = tp->c_lflag;
        tcflag_t cflag = tp->c_cflag;
        int oflags = sttygetoflags(tp) | flags;

        if (ISSET(flags, TANDEM))
                SET(iflag, IXOFF);
        if (ISSET(flags, ECHO))
                SET(lflag, ECHO);
        if (ISSET(flags, CRMOD)) {
                SET(iflag, ICRNL);
                SET(oflag, ONLCR);
        }
        if (ISSET(flags, XTABS))
                SET(oflag, OXTABS);

        tp->c_iflag = iflag;
        tp->c_oflag = oflag;
        tp->c_lflag = lflag;
        tp->c_cflag = cflag;

        sttysetoflags(tp, oflags);
}

void
sttyclearlflags(struct termios *tp, int flags)
{
        tcflag_t iflag = tp->c_iflag;
        tcflag_t oflag = tp->c_oflag;
        tcflag_t lflag = tp->c_lflag;
        tcflag_t cflag = tp->c_cflag;
        int oflags = sttygetoflags(tp) & ~flags;

        /* Nothing we can do with CRTBS. */
        if (ISSET(flags, PRTERA))
                CLR(lflag, ECHOPRT);
        if (ISSET(flags, CRTERA))
                CLR(lflag, ECHOE);
        /* Nothing we can do with TILDE. */
        if (ISSET(flags, MDMBUF))
                CLR(cflag, MDMBUF);
        if (ISSET(flags, NOHANG))
                SET(cflag, HUPCL);
        if (ISSET(flags, CRTKIL))
                CLR(lflag, ECHOKE);
        if (ISSET(flags, CTLECH))
                CLR(lflag, ECHOCTL);
        if (ISSET(flags, DECCTQ))
                SET(iflag, IXANY);
        CLR(lflag, ISSET(flags, TOSTOP|FLUSHO|PENDIN|NOFLSH));

        tp->c_iflag = iflag;
        tp->c_oflag = oflag;
        tp->c_lflag = lflag;
        tp->c_cflag = cflag;

        sttysetoflags(tp, oflags);
}

void
sttysetlflags(struct termios *tp, int flags)
{
        tcflag_t iflag = tp->c_iflag;
        tcflag_t oflag = tp->c_oflag;
        tcflag_t lflag = tp->c_lflag;
        tcflag_t cflag = tp->c_cflag;
        int oflags = sttygetoflags(tp) | flags;

        /* Nothing we can do with CRTBS. */
        if (ISSET(flags, PRTERA))
                SET(lflag, ECHOPRT);
        if (ISSET(flags, CRTERA))
                SET(lflag, ECHOE);
        /* Nothing we can do with TILDE. */
        if (ISSET(flags, MDMBUF))
                SET(cflag, MDMBUF);
        if (ISSET(flags, NOHANG))
                CLR(cflag, HUPCL);
        if (ISSET(flags, CRTKIL))
                SET(lflag, ECHOKE);
        if (ISSET(flags, CTLECH))
                SET(lflag, ECHOCTL);
        if (ISSET(flags, DECCTQ))
                CLR(iflag, IXANY);
        SET(lflag, ISSET(flags, TOSTOP|FLUSHO|PENDIN|NOFLSH));

        tp->c_iflag = iflag;
        tp->c_oflag = oflag;
        tp->c_lflag = lflag;
        tp->c_cflag = cflag;

        sttysetoflags(tp, oflags);
}