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

int kbhit(void)
{
  struct termios oldt, newt;
  int ch;
  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 ch;
  }
 
  return 0;
}
 
void clpuf(void)
 {
 while (getc(stdin) != '\n')
    ;
 } 
 

int main(void)
{
  int letter= 0;

 printf("kbhittest 0.01\n");

while((letter = kbhit()) == 0)
  {
   //if (letter != 0) clpuf();
    printf("Press a key: %d\n", letter);
   }
   printf("You pressed '%c'= %ddez = %xhex\n", letter,letter,letter);
 
 return 0;
}