#include	<stdio.h>
#include	<termios.h>
#include	<stdlib.h>
/**
 **	showtty	
 **	displays some of current tty settings
 **/

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

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;
	}
}

struct flaginfo { tcflag_t fl_value; char	*fl_name; };

static struct flaginfo input_flags[] = {

		{ IGNBRK ,	"Ignore the break condition" 	},
		{ BRKINT ,	"Signal interrupt on break" 	},
		{ IGNPAR ,	"Ignore chars with parity errors" },
		{ PARMRK ,	"Mark parity errors" 		},
		{ INPCK  ,	"Enable input parity check"	},
		{ ISTRIP ,	"Strip character" 		},
		{ INLCR  ,	"Map NL to CR on input" 		},
		{ IGNCR  ,	"Ignore CR" 				},
		{ ICRNL  ,	"Map CR to NL on input" 		},
		{ IXON   ,	"Enable start/stop output control" 	},
		{ IXOFF  ,	"Enable start/stop input control" 	},
		{ 0      ,	NULL 					}
};

static struct flaginfo local_flags[] = {
		{ ISIG   ,	"Enable signals"			},
		{ ICANON ,	"Canonical input (erase and kill)"} ,
		{ ECHO   ,	"echo" 				},
		{ ECHOE  ,	"Echo ERASE as BS-SPACE-BS"		},
		{ ECHOK  ,	"Echo KILL by starting new line"	},
		{0	,	NULL 					}
};

void show_flagset( int thevalue, struct flaginfo thebitnames[] );

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 add new
 *	tables above and a bit more code below.
 */
{
	show_flagset( ttyp->c_iflag, input_flags );
	show_flagset( ttyp->c_lflag, local_flags );
}

void show_flagset( int thevalue, struct flaginfo thebitnames[] )
/*
 * check each bit pattern and display descriptive title
 */
{
	int	i;
	
	for ( i=0; thebitnames[i].fl_value != 0 ; i++ ) {
		if ( thevalue & thebitnames[i].fl_value )
			printf("ON  ");
		else
			printf("OFF ");
		printf( "  %s\n", thebitnames[i].fl_name);
	}
}