#include	<stdio.h>
#include	<termios.h>
#include	<stdlib.h>
/**
 **	showtty0
 **	displays some of current tty settings, using MANY tests and prints
 **/

void showbaud( int thespeed );
void show_some_flags( struct termios *ttyp );
void show_lflags(tcflag_t);
void show_iflags(tcflag_t);

int main()
{
	struct	termios ttyinfo;	/* this struct holds tty info */
						
	if ( tcgetattr( 0 , &ttyinfo ) == -1 ){   /* get info */
		perror( "cannot get params about stdin");
		exit(1);
	}
						/* show info */
	showbaud ( cfgetospeed( &ttyinfo ) );	/* get + show baud rate	*/
	printf("The erase character is ascii %d, Ctrl-%c\n",
			ttyinfo.c_cc[VERASE], ttyinfo.c_cc[VERASE]-1+'A');
	printf("The line kill character is ascii %d, Ctrl-%c\n",
			ttyinfo.c_cc[VKILL], ttyinfo.c_cc[VKILL]-1+'A');

	show_some_flags( &ttyinfo );		/* show misc. flags	*/
	return 0;
}

void showbaud( int thespeed )
/*
 *	prints the speed in english
 */
{
	printf("the baud rate is ");
	switch ( thespeed ){
		case B300:	printf("300\n");	break;
		case B600:	printf("600\n"); 	break;
		case B1200:	printf("1200\n"); 	break;
		case B1800:	printf("1800\n"); 	break;
		case B2400:	printf("2400\n"); 	break;
		case B4800:	printf("4800\n"); 	break;
		case B9600:	printf("9600\n"); 	break;
		default:	printf("Fast\n");	break;
	}
}

void show_some_flags( struct termios *ttyp )
/*
 *	show the values of two of the flag sets_: c_iflag and c_lflag
 *	adding c_oflag and c_cflag is pretty routine - just tedious
 */
{
	show_iflags( ttyp->c_iflag );
	show_lflags( ttyp->c_lflag );
}

/*
 * use & with mask to test many of the bits in a flagset -- tedious
 */
void show_iflags( tcflag_t settings )
{
	if ( settings & IGNBRK )
		printf("ON  Ignore the break condition\n");
	else
		printf("OFF Ignore the break condition\n");

	if ( settings & BRKINT )
		printf("ON  SIGNAL interrupt on break\n");
	else
		printf("OFF SIGNAL interrupt on break\n");

	if ( settings & IGNPAR )
		printf("ON  Ignore chars with parity errors\n");
	else
		printf("OFF Ignore chars with parity errors\n");

	if ( settings & PARMRK )
		printf("ON  Mark parity errors\n");
	else
		printf("OFF Mark parity errors\n");

	if ( settings & INPCK )
		printf("ON  Enable input parity check\n");
	else
		printf("OFF Enable input parity check\n");

	if ( settings & ISTRIP )
		printf("ON  Strip character\n");
	else
		printf("OFF Strip character\n");

	if ( settings & INLCR )
		printf("ON  Map NL to CR on input\n");
	else
		printf("OFF Map NL to CR on input\n");

	if ( settings & IGNCR )
		printf("ON  Ignore CR\n");
	else
		printf("OFF Ignore CR\n");

	if ( settings & ICRNL )
		printf("ON  Map CR to NL on input\n");
	else
		printf("OFF Map CR to NL on input\n");

	if ( settings & IXON )
		printf("ON  Enable start/stop output control\n");
	else
		printf("OFF Enable start/stop output control\n");

	if ( settings & IXOFF )
		printf("ON  Enable start/stop input control\n");
	else
		printf("OFF Enable start/stop input control\n");
}

/*
 * test and show status of several local flags
 */
void show_lflags(tcflag_t settings)
{
	if ( settings & ISIG )
		printf("ON  Enable signals\n");
	else
		printf("OFF Enable signals\n");

	if ( settings & ICANON )
		printf("ON  Canonical input (erase and kill)\n");
	else
		printf("OFF Canonical input (erase and kill)\n");

	if ( settings & ECHO )
		printf("ON  echo\n");
	else
		printf("OFF echo\n");

	if ( settings & ECHOE )
		printf("ON  Echo ERASE as BS-SPACE-BS\n");
	else
		printf("OFF Echo ERASE as BS-SPACE-BS\n");

	if ( settings & ECHOK )
		printf("ON  Echo KILL by starting new line\n");
	else
		printf("OFF Echo KILL by starting new line\n");
}