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The following routines give low-level access to various curses functionality. Theses routines typically are used inside library routines.
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().
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().
With the getsyx() routine, the current coordinates of the virtual screen cursor are returned 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().
With the setsyx() routine, the virtual screen cursor is set 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(3CURSES)) 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 newterm().
With the curs_set() routine, 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.
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