use stdio.h
use termios.h
use unistd.h
use signal.h
use stdlib.h


use error

typedef struct termios termios
termios term, term_orig

raw()
	int rv
	rv = tcgetattr (STDIN_FILENO, &term)
	if rv < 0
		error("tcgetattr failed")
	term_orig = term

	term.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON)
	term.c_iflag |= IGNBRK | BRKINT
	term.c_oflag |= OPOST
	term.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN)
	term.c_lflag |= ISIG
	term.c_cflag &= ~(CSIZE|PARENB)
	term.c_cflag |= CS8

	term.c_cc[VMIN] = 1
	term.c_cc[VTIME] = 0

	rv = tcsetattr(STDIN_FILENO, TCSANOW, &term)
	if rv < 0
		error("tcsetattr failed")

cooked()
	int rv
	rv = tcsetattr(STDIN_FILENO, TCSAFLUSH, &term_orig)
	if rv < 0
		error("tcsetattr failed")

int get()
	unsigned char c
	ssize_t s
	s = read(STDIN_FILENO, &c, 1)
	if s == 0
		return -1
	return c

int main()
	int c
	raw()
	signal(SIGCONT, cont_handler)
	signal(SIGINT, int_handler)
	signal(SIGPIPE, int_handler)
	repeat
		c = get()
		if c == -1
			break
		printf("%d\n", c)
		fflush(stdout)
	cooked()
	return 0

cont_handler(int signum)
	raw()

int_handler(int signum)
	cooked()
	exit(1)