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diff --git a/src/gui.h b/src/gui.h
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+/*
+ *  gui.h: An ncurses GUI for nwipe.
+ *
+ *  Copyright Darik Horn <dajhorn-dban@vanadac.com>.
+ *
+ *  Modifications to original dwipe Copyright Andy Beverley <andy@andybev.com>
+ *
+ *  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, version 2.
+ *
+ *  This program 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 General Public License for more
+ *  details.
+ *
+ *  You should have received a copy of the GNU General Public License along with
+ *  this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef GUI_H_
+#define GUI_H_
+
+void nwipe_gui_free( void );  // Stop the GUI.
+void nwipe_gui_init( void );  // Start the GUI.
+void nwipe_gui_create_main_window( void );  // Create the main window
+void nwipe_gui_create_header_window( void );  // Create the header window
+void nwipe_gui_create_footer_window( const char* );  // Create the footer window and write text
+void nwipe_gui_create_options_window( void );  // Create the options window
+void nwipe_gui_create_stats_window( void );  // Create the stats window
+void nwipe_gui_create_all_windows_on_terminal_resize(
+    int force_creation,
+    const char* footer_text );  // If terminal is resized recreate all windows
+void nwipe_gui_select( int count, nwipe_context_t** c );  // Select devices to wipe.
+void* nwipe_gui_status( void* ptr );  // Update operation progress.
+void nwipe_gui_method( void );  // Change the method option.
+void nwipe_gui_options( void );  // Update the options window.
+void nwipe_gui_prng( void );  // Change the prng option.
+void nwipe_gui_rounds( void );  // Change the rounds option.
+void nwipe_gui_verify( void );  // Change the verify option.
+void nwipe_gui_noblank( void );  // Change the noblank option.
+int spinner( nwipe_context_t** ptr, int );  // Return the next spinner character
+void temp1_flash( nwipe_context_t* );  // toggles term1_flash_status, which flashes the temperature
+void wprintw_temperature( nwipe_context_t* );
+
+int compute_stats( void* ptr );
+void nwipe_update_speedring( nwipe_speedring_t* speedring, u64 speedring_done, time_t speedring_now );
+
+#define NOMENCLATURE_RESULT_STR_SIZE 8
+
+/* Note Do not change unless you understand how this value affects keyboard response and screen refresh when
+ * the drive selection screen is displayed. (prior to wipe starting). */
+#define GETCH_BLOCK_MS 250 /* millisecond block time for getch() */
+
+/* Note The value of 1 (100ms) is the ideal speed for screen refresh during a wipe, a value of 2 is noticably slower,
+ * don't change unless you understand how this value affects keyboard responsiveness and speed of screen stats/spinner
+ * updating */
+#define GETCH_GUI_STATS_UPDATE_MS 1 /* 1 * 100 = 1/10/sec = millisecond block time for gui stats screen updates */
+
+#endif /* GUI_H_ */