Kbhit.h

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/*****************************************************************************
kbhit() and getch() for Linux/UNIX
Chris Giese <geezer@execpc.com> http://my.execpc.com/~geezer
Release date: ?
This code is public domain (no copyright).
You can do whatever you want with it.
*****************************************************************************/
#if defined(_WIN32)
#include <conio.h> /* kbhit(), getch() */
#elif defined(_XBOX) || defined(X360)
#elif !defined(_PS3) && !defined(__PS3__) && !defined(SN_TARGET_PS3)
#include <sys/time.h> /* struct timeval, select() */
/* ICANON, ECHO, TCSANOW, struct termios */
#include <termios.h> /* tcgetattr(), tcsetattr() */
#include <stdlib.h> /* atexit(), exit() */
#include <unistd.h> /* read() */
#include <stdio.h> /* printf() */
#include <string.h> /* memcpy */

static struct termios g_old_kbd_mode;
/*****************************************************************************
*****************************************************************************/
static void cooked(void)
{
        tcsetattr(0, TCSANOW, &g_old_kbd_mode);
}
/*****************************************************************************
*****************************************************************************/
static void raw(void)
{
        static char init;

        struct termios new_kbd_mode;

        if(init)
                return;
/* put keyboard (stdin, actually) in raw, unbuffered mode */
        tcgetattr(0, &g_old_kbd_mode);
        memcpy(&new_kbd_mode, &g_old_kbd_mode, sizeof(struct termios));
        new_kbd_mode.c_lflag &= ~(ICANON | ECHO);
        new_kbd_mode.c_cc[VTIME] = 0;
        new_kbd_mode.c_cc[VMIN] = 1;
        tcsetattr(0, TCSANOW, &new_kbd_mode);
/* when we exit, go back to normal, "cooked" mode */
        atexit(cooked);

        init = 1;
}
/*****************************************************************************
*****************************************************************************/
static int kbhit(void)
{
        struct timeval timeout;
        fd_set read_handles;
        int status;

        raw();
/* check stdin (fd 0) for activity */
        FD_ZERO(&read_handles);
        FD_SET(0, &read_handles);
        timeout.tv_sec = timeout.tv_usec = 0;
        status = select(0 + 1, &read_handles, NULL, NULL, &timeout);
        if(status < 0)
        {
                printf("select() failed in kbhit()\n");
                exit(1);
        }
        return status;
}
/*****************************************************************************
*****************************************************************************/
static int getch(void)
{
        unsigned char temp;

        raw();
/* stdin = fd 0 */
        if(read(0, &temp, 1) != 1)
                return 0;
        return temp;
}
#endif