reworks text viewer plugin. (FS#11209)

new text viewer plugin: text_viewer.rock.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26571 a1c6a512-1295-4272-9138-f99709370657

apps/plugins/text_viewer/tv_screen_pos.h

@@ -0,0 +1,56 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 Gilles Roux
+ *               2003 Garrett Derner
+ *               2010 Yoshihisa Uchida
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#ifndef PLUGIN_TEXT_VIEWER_SCREEN_POS_H
+#define PLUGIN_TEXT_VIEWER_SCREEN_POS_H
+
+struct tv_screen_pos {
+    off_t file_pos;
+    int page;
+    int line;
+};
+
+/*
+ * return the current position
+ *
+ * return
+ *     the pointer which is stored the current position
+ */
+const struct tv_screen_pos *tv_get_screen_pos(void);
+
+/*
+ * set the current position
+ *
+ * [In] pos
+ *         the pointer which is stored the current position
+ */
+void tv_set_screen_pos(const struct tv_screen_pos *pos);
+
+/*
+ * the current position set to the given structure
+ *
+ * [Out] pos
+ *         the pointer in order to store the current position
+ */
+void tv_copy_screen_pos(struct tv_screen_pos *pos);
+
+#endif