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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 capabil-
       ities.  These routines typically	are used inside	library	routines.

   def_prog_mode, def_shell_mode
       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.

   reset_prog_mode, reset_shell_mode
       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(3X)	and, after an endwin, by doupdate,  so
       they normally are not called.

   resetty, savetty
       The resetty and savetty routines	save and restore the state of the ter-
       minal 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.

       Few applications	will use this feature, most use	getyx instead.

       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  pro-
       gram's cursor.  The library routine would call getsyx at	the beginning,
       do its manipulation of its own windows, do a wnoutrefresh on  its  win-
       dows, call setsyx, and then call	doupdate.

       Few applications	will use this feature, most use	wmove instead.

       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, to pre-
       pare these initial actions:

       o   If line is positive,	a line is removed from the top of stdscr.

       o   if line is negative,	a line is removed from the bottom.

       When the	resulting initialization is done inside	initscr,  the  routine
       init (supplied by the user) is called with two arguments:

       o   a window pointer to the one-line window that	has been allocated and

       o   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 wre-
       fresh or	doupdate must not be called.  It is allowable to call wnoutre-
       fresh during the	initialization routine.

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

       The  curs_set  routine  sets  the cursor	state 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  cur-
       rently  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 virtual screen 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),	curs_variables(3X).



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