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
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
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 programs 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
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
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.
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
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