-/* c_save.c */
-int crt_save(const char *fname);
-/* center.c */
-void crt_center_line(const char *str);
-/* clreol.c */
-void crt_clreol(void);
-/* clrline.c */
-void crt_clrline(unsigned int line);
-/* clrscrn.c */
-void crt_clrscrn(void);
-/* cpos.c */
-void crt_tab(unsigned int n);
-void crt_save_cpos(void);
-void crt_restore_cpos(void);
-/* fill_eol.c */
-void crt_fill_eol(int c, int attr);
-/* getstate.c */
-void crt_get_state(void);
-/* put_ca.c */
-void crt_set_text_clr(int fclr, int bclr);
-int crt_get_texta(void);
-void crt_set_texta(int a);
-int crt_blank_attr(void);
-void crt_put_ca(int c, int attr);
-void crt_put_c(int c);
-void crt_put_cc(int c, int count);
-void crt_put_cca(int c, int attr, int count);
-void crt_put_str(const char *str);
-void crt_put_stra(const char *str, int attr);
-void crt_inc_col(int count);
-void crt_dec_col(int count);
-void crt_dec_row(int count);
-/* scrollup.c */
-void crt_scrollup(int xmin, int ymin, int xmax, int ymax, int nline, int attr);
-/* setcpos.c */
-void crt_set_cpos(int col, int row);
-void crt_get_cpos(int *col, int *row);
-/* beep.c */
-void cio_beep(void);
-/* kb_chk.c */
-int cio_kb_chk(void);
-/* kb_clr.c */
-void cio_kb_clr(void);
-/* kb_getc.c */