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diff --git a/linux/getch2.h b/linux/getch2.h
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+/* GyS-TermIO v2.0 (for GySmail v3) (C) 1999 A'rpi/ESP-team */
+/* a very small replacement of ncurses library */
+
+/* Screen size. Initialized by load_termcap() and get_screen_size() */
+extern int screen_width;
+extern int screen_height;
+
+/* Get screen-size using IOCTL call. */
+extern void get_screen_size();
+
+/* Load key definitions from the TERMCAP database. 'termtype' can be NULL */
+extern int load_termcap(char *termtype);
+
+/* Enable and disable STDIN line-buffering */
+extern void getch2_enable();
+extern void getch2_disable();
+
+/* Read a character or a special key code (see keycodes.h) */
+extern int getch2(int halfdelay_time);
+