deb-mbse/mbsebbs/openport.c

/*****************************************************************************
 *
 * $Id$
 *
 *****************************************************************************
 * Copyright (C) 1997-2004
 *   
 * Michiel Broek		FIDO:	2:280/2802
 * Beekmansbos 10
 * 1971 BV IJmuiden
 * the Netherlands
 *
 * This file is part of MBSE BBS.
 *
 * This BBS is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * MBSE BBS is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with MBSE BBS; see the file COPYING.  If not, write to the Free
 * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *****************************************************************************/

#include "../config.h"
#include "../lib/mbselib.h"
#include "ttyio.h"
#include "openport.h"
#include "zmmisc.h"


int			hanged_up = 0;
static struct termios	oldtty;			/* Saved termios	    */
static struct termios	tty;
unsigned		Baudrate = 2400;


#define HOWMANY 255


static struct {
    unsigned	baudr;
    speed_t	speedcode;
} speeds[] = {
    {110,   B110},
    {300,   B300},
    {600,   B600},
    {1200,  B1200},
    {2400,  B2400},
    {4800,  B4800},
    {9600,  B9600},
#ifdef B12000
    {12000, B12000},
#endif
#ifdef B14400
    {14400, B14400},
#endif
#ifdef B19200
    {19200,  B19200},
#endif
#ifdef B38400
    {38400,  B38400},
#endif
#ifdef B57600
    {57600,  B57600},
#endif
#ifdef B115200
    {115200,  B115200},
#endif
#ifdef B230400
    {230400,  B230400},
#endif
#ifdef B460800
    {460800,  B460800},
#endif
#ifdef B500000
    {500000, B500000},
#endif
#ifdef EXTA
    {19200, EXTA},
#endif
#ifdef EXTB
    {38400, EXTB},
#endif
    {0, 0}
};



unsigned getspeed(speed_t);
unsigned getspeed(speed_t code)
{
    int n;

    for (n = 0; speeds[n].baudr; ++n)
	if (speeds[n].speedcode == code)
	    return speeds[n].baudr;
    return 38400;   /* Assume fifo if ioctl failed */
}



/*
 * Set port to local, hangup using DTR drop.
 */
void hangup(void)
{
    struct termios  Tios;
    tcflag_t        cflag;
    speed_t         ispeed, ospeed;
    int             rc;

    Syslog('t', "hangup()");
    
    if (isatty(0)) {
	if ((rc = tcgetattr(0,&Tios))) {
	    WriteError("$tcgetattr(0,save) return %d",rc);
	    return;
	}
	Syslog('+', "Lowering DTR to hangup");

	cflag = Tios.c_cflag | CLOCAL;

	ispeed = cfgetispeed(&tty);
	ospeed = cfgetospeed(&tty);
	cfsetispeed(&Tios,0);
	cfsetospeed(&Tios,0);
	if ((rc = tcsetattr(0,TCSADRAIN,&Tios)))
	    WriteError("$tcsetattr(0,TCSADRAIN,hangup) return %d",rc);

	sleep(1); /* as far as I notice, DTR goes back high on next op. */

	Tios.c_cflag = cflag;
	cfsetispeed(&Tios,ispeed);
	cfsetospeed(&Tios,ospeed);
	if ((rc = tcsetattr(0,TCSADRAIN,&Tios)))
	    Syslog('t', "$tcsetattr(0,TCSADRAIN,clocal) return %d",rc);
    } else {
	Syslog('t', "Not at a tty");
    }

    return;
}



/*
 * mode(n)
 *  3: save old tty stat, set raw mode with flow control
 *  2: set XON/XOFF for sb/sz with ZMODEM or YMODEM-g
 *  1: save old tty stat, set raw mode 
 *  0: restore original tty mode
 */
int io_mode(int fd, int n)
{
    static int	did0 = FALSE;

    Syslog('t', "io_mode(%d, %d)", fd, n);

    switch(n) {
	case 2:
		if (!did0) {
		    did0 = TRUE;
		    tcgetattr(fd,&oldtty);
		}
		tty = oldtty;

		tty.c_iflag = BRKINT|IXON;

		tty.c_oflag = 0;        /* Transparent output */

		tty.c_cflag &= ~PARENB; /* Disable parity */
		tty.c_cflag |= CS8;     /* Set character size = 8 */
#ifdef READCHECK
		tty.c_lflag = protocol==ZM_ZMODEM ? 0 : ISIG;
		tty.c_cc[VINTR] = protocol==ZM_ZMODEM ? -1 : 030;       /* Interrupt char */
#else
		tty.c_lflag = 0;
		tty.c_cc[VINTR] = protocol==ZM_ZMODEM ? 03 : 030;       /* Interrupt char */
#endif
#ifdef _POSIX_VDISABLE
		if (((int) _POSIX_VDISABLE)!=(-1)) {
		    tty.c_cc[VQUIT] = _POSIX_VDISABLE;              /* Quit char */
		} else {
		    tty.c_cc[VQUIT] = -1;                   /* Quit char */
		}
#else
		tty.c_cc[VQUIT] = -1;                   /* Quit char */
#endif
#ifdef NFGVMIN
		tty.c_cc[VMIN] = 1;
#else
		tty.c_cc[VMIN] = 3;      /* This many chars satisfies reads */
#endif
		tty.c_cc[VTIME] = 1;    /* or in this many tenths of seconds */

		tcsetattr(fd,TCSADRAIN,&tty);

		return 0;
	case 1:
	case 3:
		if (!did0) {
		    did0 = TRUE;
		    tcgetattr(fd,&oldtty);
		}
		tty = oldtty;

		tty.c_iflag = IGNBRK;
		if (n == 3) /* with flow control */
		    tty.c_iflag |= IXOFF;

		/* 
		 * Setup raw mode: no echo, noncanonical (no edit chars),
		 * no signal generating chars, and no extended chars (^V, 
		 * ^O, ^R, ^W).
		 */
		tty.c_lflag &= ~(ECHO | ICANON | ISIG | IEXTEN);
		tty.c_oflag = 0;        /* Transparent output */

		tty.c_cflag &= ~(PARENB);       /* Same baud rate, disable parity */
		/* Set character size = 8 */
		tty.c_cflag &= ~(CSIZE);
		tty.c_cflag |= CS8;     
#ifdef NFGVMIN
		tty.c_cc[VMIN] = 1; /* This many chars satisfies reads */
#else
		tty.c_cc[VMIN] = HOWMANY; /* This many chars satisfies reads */
#endif
		tty.c_cc[VTIME] = 1;    /* or in this many tenths of seconds */
		tcsetattr(fd,TCSADRAIN,&tty);
		Baudrate = getspeed(cfgetospeed(&tty));
		Syslog('t', "Baudrate = %d", Baudrate);
		return 0;
	case 0:
		if (!did0)
		    return -1;
		tcdrain (fd); /* wait until everything is sent */
		tcflush (fd,TCIOFLUSH); /* flush input queue */
		tcsetattr (fd,TCSADRAIN,&oldtty);
		tcflow (fd,TCOON); /* restart output */

		return 0;
    }
    return -1;
}



int rawport(void)
{
    Syslog('t', "rawport()");
    return io_mode(0, 1);
}



int cookedport(void)
{
    Syslog('t', "cookedport()");
    return io_mode(0, 0);
}



void sendbrk(void)
{
    Syslog('t', "Send break");
    
    if (isatty(0)) {
#if (defined(TIOCSBRK))
	Syslog('t', "TIOCSBRK");
	ioctl(0, TIOCSBRK, 0L);
#elif (defined(TCSBRK))
	Syslog('t', "TCSBRK");
	ioctl(0, TCSBRK, 0L);
#else /* any ideas about BSD? */
	;
#endif
    }
}