/*
   DisplayTerminalSettings - Display the settings of a terminal
   Copyright (C) 2004 Frank Sorenson (frank@tuxrocks.com)

   This program 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
   of the License, or (at your option) any later version.

   This program 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 this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <termios.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <time.h>
#include <errno.h>

int DisplayTermFlags_I(tcflag_t Flags)
{
   if (Flags & IGNBRK) printf("IGNBRK ");
   if (Flags & BRKINT) printf("BRKINT ");
   if (Flags & IGNPAR) printf("IGNPAR ");
   if (Flags & PARMRK) printf("PARMRK ");
   if (Flags & INPCK) printf("INPCK ");
   if (Flags & ISTRIP) printf("ISTRIP ");
   if (Flags & INLCR) printf("INLCR ");
   if (Flags & IGNCR) printf("IGNCR ");
   if (Flags & ICRNL) printf("CRNL ");
   if (Flags & IUCLC) printf("IUCLC ");
   if (Flags & IXON) printf("IXON ");
   if (Flags & IXANY) printf("IXANY ");
   if (Flags & IXOFF) printf("IXOFF ");
   if (Flags & IMAXBEL) printf("IMAXBEL ");
   return(0);
}

int DisplayTermFlags_O(tcflag_t Flags)
{
   if (Flags & OPOST) printf("OPOST ");
   if (Flags & OLCUC) printf("OLCUC ");
   if (Flags & ONLCR) printf("ONLCR ");
   if (Flags & OCRNL) printf("OCRNL ");
   if (Flags & ONOCR) printf("ONOCR ");
   if (Flags & ONLRET) printf("ONLRET ");
   if (Flags & OFILL) printf("OFILL ");
   if (Flags & OFDEL) printf("OFDEL ");
   if (Flags & NLDLY) printf("NLDLY ");
   if (Flags & CRDLY) printf("CRDLY ");
   if (Flags & TABDLY) printf("TABDLY ");
   if (Flags & BSDLY) printf("BSDLY ");
   if (Flags & VTDLY) printf("VTDLY ");
   if (Flags & FFDLY) printf("FFDLY ");
   return(0);
}

int DisplayTermFlags_C(tcflag_t Flags)
{
   if (Flags & CSIZE)
   {
      printf("CSIZE ");
      if (Flags & CS5 & CSIZE) printf("CS5 ");
      if (Flags & CS6 & CSIZE) printf("CS6 ");
      if (Flags & CS7 & CSIZE) printf("CS7 ");
      if (Flags & CS8 & CSIZE) printf("CS8 ");
   }
   if (Flags & CSTOPB) printf("CSTOPB ");
   if (Flags & CREAD) printf("CREAD ");
   if (Flags & PARENB) printf("PARENB ");
   if (Flags & PARODD) printf("PARODD ");
   if (Flags & HUPCL) printf("HUPCL ");
   if (Flags & CLOCAL) printf("CLOCAL ");
   if (Flags & CIBAUD) printf("CIBAUD ");
   if (Flags & CRTSCTS) printf("CRTSCTS ");
   return(0);
}

int DisplayTermFlags_L(tcflag_t Flags)
{
   if (Flags & ISIG) printf("ISIG ");
   if (Flags & ICANON) printf("ICANON ");
   if (Flags & XCASE) printf("XCASE ");
   if (Flags & ECHO) printf("ECHO ");
   if (Flags & ECHOE) printf("ECHOE ");
   if (Flags & ECHOK) printf("ECHOK ");
   if (Flags & ECHONL) printf("ECHONL ");
   if (Flags & ECHOCTL) printf("ECHOCTL ");
   if (Flags & ECHOPRT) printf("ECHOPRT ");
   if (Flags & ECHOKE) printf("ECHOKE ");
   if (Flags & FLUSHO) printf("FLUSHO ");
   if (Flags & NOFLSH) printf("NOFLSH ");
   if (Flags & TOSTOP) printf("TOSTOP ");
   if (Flags & PENDIN) printf("PENDIN ");
   if (Flags & IEXTEN) printf("IEXTEN ");
   return(0);
}

int GetTermSettings(int Port)
{
   struct termios termios;
   int Result;

   Result = tcgetattr(Port, &termios);

   printf("iflag = 0x%X: ", termios.c_iflag);
   DisplayTermFlags_I(termios.c_iflag);
   printf("\n");
   printf("oflag = 0x%X: ", termios.c_oflag);
   DisplayTermFlags_O(termios.c_oflag);
   printf("\n");
   printf("cflag = 0x%X: ", termios.c_cflag);
   DisplayTermFlags_C(termios.c_cflag);
   printf("\n");
   printf("lflag = 0x%X: ", termios.c_lflag);
   DisplayTermFlags_L(termios.c_lflag);
   printf("\n");
   return(0);
}

int main (int argc, char *argv[])
{
   int Port;

   if (argc == 1) Port = open("/dev/ttyS0", O_RDWR | O_NOCTTY);
   else Port = open(argv[1], O_RDWR | O_NOCTTY);
   if (Port == -1)
   {
      printf("An error occurred while opening the port\n");
      exit(-1);
   }
   GetTermSettings(Port);

   close (Port);
   return(0);
}