#include <stdio.h>
#include <termio.h>
#include <unistd.h>

/* Please compile with:
 *
 * gcc -W -Wall -o termex termex.c
 *
 * The program will wait for you to enter something,
 * and dump back what you have entered. So please
 * input some and let the program prints.
 */

int
main (void)
{
	struct termios oldtty, newtty;

	/* backup */
	tcgetattr (0, &oldtty);

	/* change to non-canonical mode */
	tcgetattr (0, &newtty);
	newtty.c_lflag &= (~ICANON);

	/* block until one character is read */
	newtty.c_cc[VMIN] = 1;
	newtty.c_cc[VTIME] = 0;

	tcsetattr (0, TCSANOW, &newtty);

	/* read something */
	unsigned char buf[100];
	size_t n = read (0, buf, sizeof(buf));

	/* dump what is entered */
	printf ("\nread %d bytes: ", n);

	size_t i;
	for (i=0; i<n; i++)
	{
		for (i=0; i<n; i++)
			printf ("%X ", buf[i]);
		printf ("\n");
	}

	/* revert */
	tcsetattr (0, TCSANOW, &oldtty);

	return 0;
}