khbit alternative for MacOS

_khbit_mac.cpp

// From https://cboard.cprogramming.com/c-programming/178177-very-simple-program-impossible-create-mac.html
// May need to clear input buffer between khbit() calls. Use fseek(stdin,0,SEEK_END);

#ifndef GETCH_H_INCLUDED
#define GETCH_H_INCLUDED


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


int ch;
unsigned long wait=0;


int kbhit(void)
{
  struct termios oldt, newt;
  int oldf;


  tcgetattr(STDIN_FILENO, &oldt);
  newt = oldt;
  newt.c_lflag &= ~(ICANON | ECHO);
  tcsetattr(STDIN_FILENO, TCSANOW, &newt);
  oldf = fcntl(STDIN_FILENO, F_GETFL, 0);
  fcntl(STDIN_FILENO, F_SETFL, oldf | O_NONBLOCK);


  ch = getchar();


  tcsetattr(STDIN_FILENO, TCSANOW, &oldt);
  fcntl(STDIN_FILENO, F_SETFL, oldf);


  if(ch != EOF)
  {
    ungetc(ch, stdin);
    return 1;
  }


  return 0;
}
#endif // GETCH_H_INCLUDED