unix a C

#include <string.h>

int gotoxy(int x, int y) {
  char essq[100];
  char xstr[100];
  char ystr[100];

  sprintf(xstr, "%d", x);
  sprintf(ystr, "%d", y);
  essq[0] = '\0';
  strcat(essq, "\033[");
  strcat(essq, ystr);
  strcat(essq, "d");
  strcat(essq, "\033[");
  strcat(essq, xstr);
  strcat(essq, "G");
  printf("%s", essq);

  return 0;
}

void clrscr() {
  #ifndef unix
  system("cls");
  #else
  system("clear");
  #endif
}

  puts("\33[H\33[2J");

  fputs("\33[H\33[2J",stdout);

static int initialized = 0;
static struct termios original_tty;

void kbinit()
{
  struct termios tty;
  tcgetattr(fileno(stdin), &original_tty);
  tty = original_tty;

  /* Disable ICANON line buffering, and ECHO. */
  tty.c_lflag &= ~ICANON;
  tty.c_lflag &= ~ECHO;
  tcsetattr(fileno(stdin), TCSANOW, &tty);

  /* Decouple the FILE*'s internal buffer. */
  /* Rely on the OS buffer, probably 8192 bytes. */
  setbuf(stdin, NULL);
  initialized = 1;
}

/* Call this just before main() quits, to restore TTY settings! */
void kbfini()
{
  if(initialized)
  {
    tcsetattr(fileno(stdin), TCSANOW, &original_tty);
    initialized = 0;
  }
}

int kbhit()
{
  if(!initialized)
  {
    kbinit();
  }

  int bytesWaiting;
  ioctl(fileno(stdin), FIONREAD, &bytesWaiting);
  return bytesWaiting;
}

/* Call this just when main() does its initialization. */
/* Note: kbhit will call this if it hasn't been done yet. */