text: /****************************************************************************
  **
  ** Copyright (C) 2013 Laszlo Papp <lpapp@kde.org>
  ** Contact: http://www.qt-project.org/legal
  **
  ** This file is part of the QtSerialPort module of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:LGPL$
  ** Commercial License Usage
  ** Licensees holding valid commercial Qt licenses may use this file in
  ** accordance with the commercial license agreement provided with the
  ** Software or, alternatively, in accordance with the terms contained in
  ** a written agreement between you and Digia.  For licensing terms and
  ** conditions see http://qt.digia.com/licensing.  For further information
  ** use the contact form at http://qt.digia.com/contact-us.
  **
  ** GNU Lesser General Public License Usage
  ** Alternatively, this file may be used under the terms of the GNU Lesser
  ** General Public License version 2.1 as published by the Free Software
  ** Foundation and appearing in the file LICENSE.LGPL included in the
  ** packaging of this file.  Please review the following information to
  ** ensure the GNU Lesser General Public License version 2.1 requirements
  ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
  **
  ** In addition, as a special exception, Digia gives you certain additional
  ** rights.  These rights are described in the Digia Qt LGPL Exception
  ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
  **
  ** GNU General Public License Usage
  ** Alternatively, this file may be used under the terms of the GNU
  ** General Public License version 3.0 as published by the Free Software
  ** Foundation and appearing in the file LICENSE.GPL included in the
  ** packaging of this file.  Please review the following information to
  ** ensure the GNU General Public License version 3.0 requirements will be
  ** met: http://www.gnu.org/copyleft/gpl.html.
  **
  **
  ** $QT_END_LICENSE$
  **
  ****************************************************************************/
  
  #ifndef QTUDEV_P_H
  #define QTUDEV_P_H
  
  #ifdef LINK_LIBUDEV
  extern "C"
  {
  #include <libudev.h>
  }
  #else
  #include <QtCore/qlibrary.h>
  #include <QtCore/qstring.h>
  #include <QtCore/qdebug.h>
  
  #define GENERATE_SYMBOL_VARIABLE(returnType, symbolName, ...) \
      typedef returnType (*fp_##symbolName)(__VA_ARGS__); \
      fp_##symbolName symbolName;
  
  #define RESOLVE_SYMBOL(symbolName) \
      symbolName = (fp_##symbolName)resolveSymbol(udevLibrary, #symbolName); \
      if (!symbolName) \
          return false;
  
  struct udev;
  
  #define udev_list_entry_foreach(list_entry, first_entry) \
          for (list_entry = first_entry; \
               list_entry != NULL; \
               list_entry = udev_list_entry_get_next(list_entry))
  
  struct udev_device;
  struct udev_enumerate;
  struct udev_list_entry;
  
  GENERATE_SYMBOL_VARIABLE(struct ::udev *, udev_new);
  GENERATE_SYMBOL_VARIABLE(struct ::udev_enumerate *, udev_enumerate_new, struct ::udev *)
  GENERATE_SYMBOL_VARIABLE(int, udev_enumerate_add_match_subsystem, struct udev_enumerate *, const char *)
  GENERATE_SYMBOL_VARIABLE(int, udev_enumerate_scan_devices, struct udev_enumerate *)
  GENERATE_SYMBOL_VARIABLE(struct udev_list_entry *, udev_enumerate_get_list_entry, struct udev_enumerate *)
  GENERATE_SYMBOL_VARIABLE(struct udev_list_entry *, udev_list_entry_get_next, struct udev_list_entry *)
  GENERATE_SYMBOL_VARIABLE(struct udev_device *, udev_device_new_from_syspath, struct udev *udev, const char *syspath)
  GENERATE_SYMBOL_VARIABLE(const char *, udev_list_entry_get_name, struct udev_list_entry *)
  GENERATE_SYMBOL_VARIABLE(const char *, udev_device_get_devnode, struct udev_device *)
  GENERATE_SYMBOL_VARIABLE(const char *, udev_device_get_sysname, struct udev_device *)
  GENERATE_SYMBOL_VARIABLE(const char *, udev_device_get_driver, struct udev_device *)
  GENERATE_SYMBOL_VARIABLE(struct udev_device *, udev_device_get_parent, struct udev_device *)
  GENERATE_SYMBOL_VARIABLE(const char *, udev_device_get_subsystem, struct udev_device *)
  GENERATE_SYMBOL_VARIABLE(const char *, udev_device_get_property_value, struct udev_device *, const char *)
  GENERATE_SYMBOL_VARIABLE(void, udev_device_unref, struct udev_device *)
  GENERATE_SYMBOL_VARIABLE(void, udev_enumerate_unref, struct udev_enumerate *)
  GENERATE_SYMBOL_VARIABLE(void, udev_unref, struct udev *)
  
  #if (QT_VERSION >= QT_VERSION_CHECK(5, 0, 0))
  inline QFunctionPointer resolveSymbol(QLibrary *udevLibrary, const char *symbolName)
  {
      QFunctionPointer symbolFunctionPointer = udevLibrary->resolve(symbolName);
  #else
  inline void *resolveSymbol(QLibrary *udevLibrary, const char *symbolName)
  {
      void *symbolFunctionPointer = udevLibrary->resolve(symbolName);
  #endif
      if (!symbolFunctionPointer)
          qWarning("Failed to resolve the udev symbol: %s", symbolName);
  
      return symbolFunctionPointer;
  }
  
  inline bool resolveSymbols(QLibrary *udevLibrary)
  {
      if (!udevLibrary->isLoaded()) {
          udevLibrary->setFileNameAndVersion(QStringLiteral("udev"), 1);
          if (!udevLibrary->load()) {
              udevLibrary->setFileNameAndVersion(QStringLiteral("udev"), 0);
              if (!udevLibrary->load()) {
                  qWarning("Failed to load the library: %s, supported version(s): %i and %i", qPrintable(udevLibrary->fileName()), 1, 0);
                  return false;
              }
          }
      }
  
      RESOLVE_SYMBOL(udev_new)
      RESOLVE_SYMBOL(udev_enumerate_new)
      RESOLVE_SYMBOL(udev_enumerate_add_match_subsystem)
      RESOLVE_SYMBOL(udev_enumerate_scan_devices)
      RESOLVE_SYMBOL(udev_enumerate_get_list_entry)
      RESOLVE_SYMBOL(udev_list_entry_get_next)
      RESOLVE_SYMBOL(udev_device_new_from_syspath)
      RESOLVE_SYMBOL(udev_list_entry_get_name)
      RESOLVE_SYMBOL(udev_device_get_devnode)
      RESOLVE_SYMBOL(udev_device_get_sysname)
      RESOLVE_SYMBOL(udev_device_get_driver)
      RESOLVE_SYMBOL(udev_device_get_parent)
      RESOLVE_SYMBOL(udev_device_get_subsystem)
      RESOLVE_SYMBOL(udev_device_get_property_value)
      RESOLVE_SYMBOL(udev_device_unref)
      RESOLVE_SYMBOL(udev_enumerate_unref)
      RESOLVE_SYMBOL(udev_unref)
  
      return true;
  }
  
  #endif
  
  #endif
  