/*** includes ***/

#include <stdlib.h>
#include <termios.h>
#include <unistd.h>
#include <ctype.h>
#include <stdio.h>
#include <errno.h>

/*** data ***/

struct termios original_termios;

/*** terminal ***/

void die(const char *s) {
    perror(s);
    exit(1);
}

void disable_raw_mode() {
    if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &original_termios) == -1) {
        die("tcsetattr");
    }
}

void enable_raw_mode() {
    if (tcgetattr(STDIN_FILENO, &original_termios) == -1) {
        die("tcgetattr");
    }
    atexit(disable_raw_mode);

    struct termios raw = original_termios;
    raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
    raw.c_oflag &= ~(OPOST);
    raw.c_cflag |= (CS8);
    raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
    raw.c_cc[VMIN] = 0;
    raw.c_cc[VTIME] = 1;

    if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &raw) == -1) {
        die("tcsetattr");
    }
}

/*** init ***/

int main() {
    enable_raw_mode();
    while (1) {
        char c = '\0';
        if (read(STDIN_FILENO, &c, 1) == -1 && errno != EAGAIN) {
            die("read");
        }
        if (iscntrl(c)) {
            printf("%d\r\n", c);
        } else {
            printf("%d ('%c')\r\n", c, c);
        }
        if (c == 'q') break;
    }
    return 0;
}