How can I grab single key hit in D Programming Language + Tango?

Question

I read this article and try to do the exercise in D Programming Language, but encounter a problem in the first exercise.

(1) Display series of numbers (1,2,3,4, 5....etc) in an infinite loop. The program should quit if someone hits a specific key (Say ESCAPE key).

Of course the infinite loop is not a big problem, but the rest is. How could I grab a key hit in D/Tango? In tango FAQ it says use C function kbhit() or get(), but as I know, these are not in C standard library, and does not exist in glibc which come with my Linux machine which I use to programming.

I know I can use some 3rd party library like ncurses, but it has same problem just like kbhit() or get(), it is not standard library in C or D and not pre-installed on Windows. What I hope is that I could done this exercise use just D/Tango and could run it on both Linux and Windows machine.

How could I do it?

Answer 1

Here's how you do it in the D programming language:

    import std.c.stdio;
    import std.c.linux.termios;

    termios  ostate;                 /* saved tty state */
    termios  nstate;                 /* values for editor mode */

    // Open stdin in raw mode
    /* Adjust output channel        */
    tcgetattr(1, &ostate);                       /* save old state */
    tcgetattr(1, &nstate);                       /* get base of new state */
    cfmakeraw(&nstate);
    tcsetattr(1, TCSADRAIN, &nstate);      /* set mode */

   // Read characters in raw mode
    c = fgetc(stdin);

    // Close
    tcsetattr(1, TCSADRAIN, &ostate);       // return to original mode