utils.c

/*
 * Functions in this file are provided as is to help starting and ending the
 * main application loop.
 */
#include "utils.h"

/// Utilities to read from the keyboard ///

uint16_t check_key() {
  fd_set readfds;
  FD_ZERO(&readfds);
  FD_SET(STDIN_FILENO, &readfds);

  struct timeval timeout;
  timeout.tv_sec = 0;
  timeout.tv_usec = 0;
  return select(1, &readfds, NULL, NULL, &timeout) != 0;
}

struct termios original_tio;

void disable_input_buffering() {
  tcgetattr(STDIN_FILENO, &original_tio);
  struct termios new_tio = original_tio;
  new_tio.c_lflag &= ~ICANON & ~ECHO;
  tcsetattr(STDIN_FILENO, TCSANOW, &new_tio);
}

void restore_input_buffering() {
  tcsetattr(STDIN_FILENO, TCSANOW, &original_tio);
}

void handle_interrupt(int signal) {
  restore_input_buffering();
  printf("\n");
  exit(-2);
}