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+/*
+     PLIB - A Suite of Portable Game Libraries
+     Copyright (C) 1998,2002  Steve Baker
+
+     This library is free software; you can redistribute it and/or
+     modify it under the terms of the GNU Library General Public
+     License as published by the Free Software Foundation; either
+     version 2 of the License, or (at your option) any later version.
+
+     This library is distributed in the hope that it will be useful,
+     but WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     Library General Public License for more details.
+
+     You should have received a copy of the GNU Library General Public
+     License along with this library; if not, write to the Free Software
+     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+
+     For further information visit http://plib.sourceforge.net
+
+     $Id: jsLinux.cxx 2017 2005-02-21 07:37:25Z bram $
+*/
+
+#include "FlightGear_js.h"
+
+#include <unistd.h>
+#include <linux/joystick.h>
+
+#include <simgear/debug/logstream.hxx>
+
+
+#if defined(JS_VERSION) && JS_VERSION >= 0x010000
+
+#include <sys/param.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+struct os_specific_s {
+  js_event     js          ;
+  int          tmp_buttons ;
+  float        tmp_axes [ _JS_MAX_AXES ] ;
+  char         fname [ 128 ] ;
+  int          fd ;
+};
+
+void jsInit () {}
+
+void jsJoystick::open ()
+{
+  name [0] = '\0' ;
+
+  for ( int i = 0 ; i < _JS_MAX_AXES ; i++ )
+    os->tmp_axes [ i ] = 0.0f ;
+
+  os->tmp_buttons = 0 ;
+
+  os->fd = ::open ( os->fname, O_RDONLY ) ;
+
+  error = ( os->fd < 0 ) ;
+
+  if ( error )
+    return ;
+
+  /*
+    Set the correct number of axes for the linux driver
+  */
+
+  /* Melchior Franz's fixes for big-endian Linuxes since writing
+   *  to the upper byte of an uninitialized word doesn't work.
+   *  9 April 2003
+   */
+  unsigned char u ;
+  ioctl ( os->fd, JSIOCGAXES   , &u ) ;
+  num_axes = u ;
+  ioctl ( os->fd, JSIOCGBUTTONS, &u ) ;
+  num_buttons = u ;
+  ioctl ( os->fd, JSIOCGNAME ( sizeof(name) ), name ) ;
+  fcntl ( os->fd, F_SETFL      , O_NONBLOCK   ) ;
+
+  if ( num_axes > _JS_MAX_AXES )
+    num_axes = _JS_MAX_AXES ;
+
+  for ( int i = 0 ; i < _JS_MAX_AXES ; i++ )
+  {
+    max       [ i ] = 32767.0f ;
+    center    [ i ] = 0.0f ;
+    min       [ i ] = -32767.0f ;
+    dead_band [ i ] = 0.0f ;
+    saturate  [ i ] = 1.0f ;
+  }
+}
+
+
+
+void jsJoystick::close ()
+{
+  if ( ! error )
+    ::close ( os->fd ) ;
+  delete os;
+}
+
+
+jsJoystick::jsJoystick ( int ident )
+{
+  id = ident ;
+  os = new struct os_specific_s;
+  name [0] = '\0' ;
+
+  sprintf ( os->fname, "/dev/input/js%d", ident ) ;
+
+  if ( access ( os->fname, F_OK ) != 0 )
+    sprintf ( os->fname, "/dev/js%d", ident ) ;
+
+  open () ;
+}
+
+
+void jsJoystick::rawRead ( int *buttons, float *axes )
+{
+  if ( error )
+  {
+    if ( buttons )
+      *buttons = 0 ;
+
+    if ( axes )
+      for ( int i = 0 ; i < num_axes ; i++ )
+        axes[i] = 1500.0f ;
+
+    return ;
+  }
+
+  while (1)
+  {
+    int status = ::read ( os->fd, &(os->js), sizeof(js_event) ) ;
+
+    if ( status != sizeof(js_event) )
+    {
+      /* use the old values */
+
+      if ( buttons != NULL ) *buttons = os->tmp_buttons ;
+      if ( axes    != NULL )
+        memcpy ( axes, os->tmp_axes, sizeof(float) * num_axes ) ;
+
+      if ( errno == EAGAIN )
+        return ;
+
+      perror( os->fname ) ;
+      setError () ;
+      return ;
+    }
+
+    switch ( os->js.type & ~JS_EVENT_INIT )
+    {
+      case JS_EVENT_BUTTON :
+        if ( os->js.value == 0 ) /* clear the flag */
+          os->tmp_buttons &= ~(1 << os->js.number) ;
+        else
+          os->tmp_buttons |=  (1 << os->js.number) ;
+        break ;
+
+      case JS_EVENT_AXIS:
+        if ( os->js.number < num_axes )
+        {
+          os->tmp_axes [ os->js.number ] = (float) os->js.value ;
+
+          if ( axes )
+            memcpy ( axes, os->tmp_axes, sizeof(float) * num_axes ) ;
+        }
+        break ;
+
+      default:
+        jsSetError ( SG_WARN, "PLIB_JS: Unrecognised /dev/js return!?!" ) ;
+
+        /* use the old values */
+
+        if ( buttons != NULL ) *buttons = os->tmp_buttons ;
+        if ( axes    != NULL )
+          memcpy ( axes, os->tmp_axes, sizeof(float) * num_axes ) ;
+
+        return ;
+    }
+
+    if ( buttons != NULL )
+      *buttons = os->tmp_buttons ;
+  }
+}
+
+#endif