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diff --git a/crawl-ref/source/state.h b/crawl-ref/source/state.h
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+/*
+ *  File:       state.h
+ *  Summary:    Game state.
+ *  Written by: Linley Henzell
+ *
+ *  Modified for Crawl Reference by $Author: j-p-e-g $ on $Date: 2007-09-10 11:21:32 -0700 (Mon, 10 Sep 2007) $
+ *
+ *  Change History (most recent first):
+ *
+ * <1>     7/11/07    MPC   Split off from externs.h
+ */
+
+#ifndef STATE_H
+#define STATE_H
+
+// Track various aspects of Crawl game state.
+struct game_state
+{
+    bool mouse_enabled;     // True if mouse input is currently relevant.
+    
+    bool waiting_for_command; // True when the game is waiting for a command.
+    bool terminal_resized;   // True if the term was resized and we need to
+                             // take action to handle it.
+    
+    bool io_inited;         // Is curses or the equivalent initialised?
+    bool need_save;         // Set to true when game has started.
+    bool saving_game;       // Set to true while in save_game.
+    bool updating_scores;   // Set to true while updating hiscores.
+
+    int  seen_hups;         // Set to true if SIGHUP received.
+
+    bool map_stat_gen;      // Set if we're generating stats on maps.
+    
+    bool unicode_ok;        // Is unicode support available?
+
+    std::string (*glyph2strfn)(unsigned glyph);
+    int  (*multibyte_strlen)(const std::string &s);
+    void (*terminal_resize_handler)();
+    void (*terminal_resize_check)();
+
+    game_state() : mouse_enabled(false), waiting_for_command(false),
+                   terminal_resized(false), io_inited(false), need_save(false),
+                   saving_game(false), updating_scores(false),
+                   seen_hups(0), map_stat_gen(false), unicode_ok(false),
+                   glyph2strfn(NULL), multibyte_strlen(NULL),
+                   terminal_resize_handler(NULL), terminal_resize_check(NULL)
+    {
+    }
+
+    void check_term_size() const
+    {
+        if (terminal_resize_check)
+            (*terminal_resize_check)();
+    }
+};
+extern game_state crawl_state;
+
+#endif