/*      $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);
}

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