kilo.c

/*** includes ***/

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

/*** difnes ***/

#define CTRL_KEY(k) ((k) & 0x1f)

/*** data ***/

struct termios orig_termios;

/*** terminal ***/

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

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

void enableRawMode() {
  if (tcgetattr(STDERR_FILENO, &orig_termios) == -1) die("tcgetattr");
  atexit(disableRawMode);

  struct termios raw = orig_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() {
  enableRawMode();

  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 == CTRL_KEY('q')) break;
  }

  return 0;
}