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curs_kernel(3X)                                                curs_kernel(3X)

       def_prog_mode, def_shell_mode, reset_prog_mode, reset_shell_mode,
       resetty, savetty, getsyx, setsyx, ripoffline, curs_set, napms - low-
       level curses routines

       #include <curses.h>

       int def_prog_mode(void);
       int def_shell_mode(void);
       int reset_prog_mode(void);
       int reset_shell_mode(void);
       int resetty(void);
       int savetty(void);
       void getsyx(int y, int x);
       void setsyx(int y, int x);
       int ripoffline(int line, int (*init)(WINDOW *, int));
       int curs_set(int visibility);
       int napms(int ms);

       The following routines give low-level access to various curses
       capabilities.  Theses routines typically are used inside library

       The def_prog_mode and def_shell_mode routines save the current terminal
       modes as the "program" (in curses) or "shell" (not in curses) state for
       use by the reset_prog_mode and reset_shell_mode routines.  This is done
       automatically by initscr.  There is one such save area for each screen
       context allocated by newterm().

       The reset_prog_mode and reset_shell_mode routines restore the terminal
       to "program" (in curses) or "shell" (out of curses) state.  These are
       done automatically by endwin and, after an endwin, by doupdate, so they
       normally are not called.

       The resetty and savetty routines save and restore the state of the
       terminal modes.  savetty saves the current state in a buffer and
       resetty restores the state to what it was at the last call to savetty.

       The getsyx routine returns the current coordinates of the virtual
       screen cursor in y and x.  If leaveok is currently TRUE, then -1,-1 is
       returned.  If lines have been removed from the top of the screen, using
       ripoffline, y and x include these lines; therefore, y and x should be
       used only as arguments for setsyx.

       The setsyx routine sets the virtual screen cursor to y, x.  If y and x
       are both -1, then leaveok is set.  The two routines getsyx and setsyx
       are designed to be used by a library routine, which manipulates curses
       windows but does not want to change the current position of the
       program's cursor.  The library routine would call getsyx at the
       beginning, do its manipulation of its own windows, do a wnoutrefresh on
       its windows, call setsyx, and then call doupdate.

       The ripoffline routine provides access to the same facility that
       slk_init [see curs_slk(3X)] uses to reduce the size of the screen.
       ripoffline must be called before initscr or newterm is called.  If line
       is positive, a line is removed from the top of stdscr; if line is
       negative, a line is removed from the bottom.  When this is done inside
       initscr, the routine init (supplied by the user) is called with two
       arguments: a window pointer to the one-line window that has been
       allocated and an integer with the number of columns in the window.
       Inside this initialization routine, the integer variables LINES and
       COLS (defined in <curses.h>) are not guaranteed to be accurate and
       wrefresh or doupdate must not be called.  It is allowable to call
       wnoutrefresh during the initialization routine.

       ripoffline can be called up to five times before calling initscr or

       The curs_set routine sets the cursor state is set to invisible, normal,
       or very visible for visibility equal to 0, 1, or 2 respectively.  If
       the terminal supports the visibility requested, the previous cursor
       state is returned; otherwise, ERR is returned.

       The napms routine is used to sleep for ms milliseconds.

       Except for curs_set, these routines always return OK.

       curs_set returns the previous cursor state, or ERR if the requested
       visibility is not supported.

       X/Open defines no error conditions.  In this implementation

              def_prog_mode, def_shell_mode, reset_prog_mode, reset_shell_mode
                   return an error if the terminal was not initialized, or if
                   the I/O call to obtain the terminal settings fails.

                   returns an error if the maximum number of ripped-off lines
                   exceeds the maximum (NRIPS = 5).

       Note that getsyx is a macro, so & is not necessary before the variables
       y and x.

       Older SVr4 man pages warn that the return value of curs_set "is
       currently incorrect".  This implementation gets it right, but it may be
       unwise to count on the correctness of the return value anywhere else.

       Both ncurses and SVr4 will call curs_set in endwin if curs_set has been
       called to make the cursor other than normal, i.e., either invisible or
       very visible.  There is no way for ncurses to determine the initial
       cursor state to restore that.

       The functions setsyx and getsyx are not described in the XSI Curses
       standard, Issue 4.  All other functions are as described in XSI Curses.

       The SVr4 documentation describes setsyx and getsyx as having return
       type int. This is misleading, as they are macros with no documented
       semantics for the return value.

       curses(3X), curs_initscr(3X), curs_outopts(3X), curs_refresh(3X),
       curs_scr_dump(3X), curs_slk(3X)



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