diff --git a/src/textbuf_gui.h b/src/textbuf_gui.h
new file mode 100644
--- /dev/null
+++ b/src/textbuf_gui.h
@@ -0,0 +1,45 @@
+/* $Id$ */
+
+/** @file textbuf_gui.h Stuff related to the text buffer GUI. */
+
+#ifndef TEXTBUF_GUI_H
+#define TEXTBUF_GUI_H
+
+#include "window_type.h"
+
+struct Textbuf {
+	char *buf;                  ///< buffer in which text is saved
+	uint16 maxlength, maxwidth; ///< the maximum size of the buffer. Maxwidth specifies screensize in pixels, maxlength is in bytes
+	uint16 length, width;       ///< the current size of the string. Width specifies screensize in pixels, length is in bytes
+	bool caret;                 ///< is the caret ("_") visible or not
+	uint16 caretpos;            ///< the current position of the caret in the buffer, in bytes
+	uint16 caretxoffs;          ///< the current position of the caret in pixels
+};
+
+struct querystr_d {
+	StringID caption;
+	Textbuf text;
+	const char *orig;
+	CharSetFilter afilter;
+	bool handled;
+};
+assert_compile(WINDOW_CUSTOM_SIZE >= sizeof(querystr_d));
+
+
+void DrawEditBox(Window *w, querystr_d *string, int wid);
+void HandleEditBox(Window *w, querystr_d *string, int wid);
+int HandleEditBoxKey(Window *w, querystr_d *string, int wid, WindowEvent *we);
+bool HandleCaret(Textbuf *tb);
+
+void DeleteTextBufferAll(Textbuf *tb);
+bool DeleteTextBufferChar(Textbuf *tb, int delmode);
+bool InsertTextBufferChar(Textbuf *tb, uint32 key);
+bool InsertTextBufferClipboard(Textbuf *tb);
+bool MoveTextBufferPos(Textbuf *tb, int navmode);
+void InitializeTextBuffer(Textbuf *tb, const char *buf, uint16 maxlength, uint16 maxwidth);
+void UpdateTextBufferSize(Textbuf *tb);
+
+void ShowQueryString(StringID str, StringID caption, uint maxlen, uint maxwidth, Window *parent, CharSetFilter afilter);
+void ShowQuery(StringID caption, StringID message, Window *w, void (*callback)(Window*, bool));
+
+#endif /* TEXTBUF_GUI_H */