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

int main(void)
{
	struct termios orig, raw;
	tcgetattr(STDIN_FILENO, &orig);
	raw = orig;
	raw.c_lflag &= ~(ICANON | ECHO);
	raw.c_cc[VMIN] = 1;
	tcsetattr(STDIN_FILENO, TCSANOW, &raw);

	printf("Press keys (Ctrl-D to quit):\n");
	for (;;) {
		unsigned char c;
		if (read(STDIN_FILENO, &c, 1) <= 0 || c == 0x04)
			break;
		printf("  dec=%3d  hex=0x%02X  oct=%03o", c, c, c);
		if (c >= 32 && c < 127)
			printf("  char='%c'", c);
		else if (c >= 0xC0)
			printf("  (UTF-8 lead byte, %d-byte seq)",
			       c < 0xE0 ? 2 : c < 0xF0 ? 3 : 4);
		else if ((c & 0xC0) == 0x80)
			printf("  (UTF-8 continuation)");
		printf("\n");
	}

	tcsetattr(STDIN_FILENO, TCSANOW, &orig);
	return 0;
}