Get single keystroke?

[Andrej Mitrovic]

On 3/21/11, teo <teo.ubuntu at yahoo.com> wrote:
> On Mon, 21 Mar 2011 23:22:17 +0100, Andrej Mitrovic wrote:
>
>> Woops forgot to add import std.stdio, here's a fixed version:
>>
>> import std.stdio : writefln;
>> import std.c.stdio;
>> import std.c.linux.termios;
>>
>> extern(C) void cfmakeraw(termios *termios_p);
>>
>> void main()
>> {
>>     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
>>     writefln("The key hit is %s", cast(char)fgetc(stdin));
>>
>>        // Close
>>     tcsetattr(1, TCSADRAIN, &ostate);       // return to original mode
>> }
>
> It looks like this can be dangerous, because the terminal can be left in
> an unusable state. Please read this:
> http://groups.google.com/group/comp.os.linux.development.apps/
> browse_thread/thread/0667d16089e2b6fc
>

H mentions using tcgetattr to save old state and restoring it with
tcsetattr. This is what this code does. Btw this code is not mine,
Walter posted it and I just added the cfmakeraw prototype. So kudos
goes to him.