CURSES_REFRESH(3)

NAME
curses_refresh, refresh, wrefresh, wnoutrefresh, doupdate, immedok, flushok, leaveok, is_leaveok - curses terminal update routines

LIBRARY
libcurses

SYNOPSIS
#include <curses.h>
int
refresh(void);
int
wrefresh(WINDOW *win);
int
wnoutrefresh(WINDOW *win);
int
doupdate(void);
int
immedok(WINDOW *win, boolf flag);
int
flushok(WINDOW *win, boolf flag);
int
leaveok(WINDOW *win, boolf flag);
bool
is_leaveok(const WINDOW *win);

DESCRIPTION
These functions update the terminal with the contents of stdscr or of the specified window(s).

The refresh() function causes curses to propagate changes made to stdscr to the terminal display. Any changes made to subwindows of stdscr are also propagated.

The wrefresh() function is the same as the refresh() function, excepting that changes are propagated to the terminal from the window specified by win.

The wnoutrefresh() function performs the internal processing required by curses to determine what changes need to be made to synchronise the internal screen buffer and the terminal but does not modify the terminal display.

The doupdate() function updates the terminal display to match the internal curses representation of the display.

The wnoutrefresh() and doupdate() functions can be used together to speed up terminal redraws by deferring the actual terminal updates until after a batch of updates to multiple windows has been done.

The refresh() function is equivalent to wnoutrefresh(stdscr) followed by doupdate().

The immedok() function determines whether the screen is refreshed whenever the window is changed. The initial state is FALSE.

The flushok() function is used to determine whether or not the screen's output file descriptor will be flushed on refresh. Setting flag to TRUE will cause the output to be flushed.

The leaveok() function determines whether refresh operations may leave the screen cursor in an arbitrary position on the screen. Setting flag to FALSE ensures that the screen cursor is positioned at the current cursor position after a refresh operation has taken place. The is_leaveok() function returns the setting.

RETURN VALUES
Functions returning pointers will return NULL if an error is detected. The functions that return an int will return one of the following values:

OK  The function completed successfully.
ERR An error occurred in the function.

SEE ALSO
curses_pad(3), curses_touch(3), getch(3)

NOTES
Calling wrefresh() on a new, unchanged window has no effect.

STANDARDS
The NetBSD Curses library complies with the X/Open Curses specification, part of the Single Unix Specification.

HISTORY
The Curses package appeared in 4.0BSD. The is_leaveok() function is a ncurses extension to the Curses library and was added in NetBSD 8.0.