title: Implementation of ungetch() in Clang
body: <p>I wanted to ask is there any code available to implement <code>ungetch()</code> function from <code>conio.h</code> header file in Clang compiler. I want to compile my code using Clang which has to use the <code>ungetch</code> function. I guess this function has no implementation in Clang. Is there any similar function supported by Clang ?</p>