adding a kbhit() function

viz/curses/ecran.c

@@ -11,6 +11,30 @@
 
 extern int	verbosity;
 
+/* ---------------------------------------------------------------- */
+int kbhit(void)
+{
+int		r, ch;
+
+nodelay(stdscr, TRUE);
+noecho();
+
+    // check for input
+ch = getch();
+if( ch == ERR) {     // no input
+	r = FALSE;
+	}
+else	{                // input
+	r = TRUE;
+	ungetch(ch);
+	}
+
+// restore block and echo
+echo();
+nodelay(stdscr, FALSE);
+
+return r;
+}
 /* ---------------------------------------------------------------- */
 int message(char *txt)
 {

viz/curses/ecran.h

@@ -2,6 +2,8 @@
  *	interface ncurses pour dd2 monitoring
  */
 
+int kbhit(void);
+
 int fond_ecran(char *titre);
 int message(char *);