The following routines give low-level access to various curses
capabilities. These 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(3X) 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
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, to
prepare these initial actions:
· 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 the resulting initialization 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
· 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 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 ex‐
ceeds 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
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
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.
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