#include <stdio.h>
#include <sys/ioctl.h>
#include <termio.h>

char *control_chars[] = {
	"^@  NUL",
	"^A  SOH",
	"^B  STX",
	"^C  ETX",
	"^D  EOT",
	"^E  ENQ",
	"^F  ACK",
	"^G  BEL",
	"^H  BS ",
	"^I  HT ",
	"^J  NL ",
	"^K  VT ",
	"^L  NP ",
	"^M  CR ",
	"^N  SO ",
	"^O  SI ",
	"^P  DLE",
	"^Q  DC1",
	"^R  DC2",
	"^S  DC3",
	"^T  DC4",
	"^U  NAK",
	"^V  SYN",
	"^W  ETB",
	"^X  CAN",
	"^Y  EM ",
	"^Z  SUB",
	"^[  ESC",
	"^\\  FS ",
	"^]  GS ",
	"^^  RS ",
	"^_  US "
};

main()
{
	int c;
	int exitcnt=0;
	FILE *fp;
	struct termio term,oldterm;

	fprintf(stderr,"Press ~ three times to exit\n");
	ioctl(0,TCGETA,&oldterm);
	ioctl(0,TCGETA,&term);
	term.c_lflag = 0;
	term.c_iflag = 0;
	term.c_cc[VMIN] = 1;
	term.c_cc[VTIME] = 0;
	ioctl(0,TCSETA,&term);
	while ( exitcnt < 3 ) {
		c = getchar();
		if ( c == '~' )
			exitcnt++;
		else
			exitcnt = 0;

		if ( c >= ' ' )
			printf("Dec=%-3d    Oct=%03o    Hex=%02x    ASCII=%c\n",
				c,c,c,c);
		else
			printf("Dec=%-3d    Oct=%03o    Hex=%02x    ASCII=%s\n",
				c,c,c,control_chars[c]);
	}
	ioctl(0,TCSETA,&oldterm);
}