CURSES_SCREEN(3) BSD Library Functions Manual CURSES_SCREEN(3)
curses_screen, newterm, set_term, delscreen, endwin, initscr, isendwin, resizeterm, setterm
-- curses terminal and screen routines
Curses Library (libcurses, -lcurses)
newterm(char *type, FILE *outfd, FILE *infd);
resizeterm(int lines, int cols);
extern int LINES;
extern int COLS;
These functions initialize terminals and screens.
The newterm() function initialises the curses data structures and pointers ready for use by
curses. The type argument points to a termcap(5) capability name, or it may be NULL in
which case the TERM environment variable is used. The outfd and infd are the output and
input file descriptors for the terminal. The newterm() function must only be called once
The set_term() function can be used to switch between the screens defined by calling
newterm(), a pointer to the previous screen structure that was in use will be returned on
Calling delscreen() will destroy the given screen and free all allocated resources.
Calling endwin() will end the curses session and restore the saved terminal settings.
The curses session must be initialised by calling initscr() which saves the current terminal
state and sets up the terminal and internal data structures to support the curses applica-
tion. This function call must be, with few exceptions, the first Curses library call made.
The exception to this rule is the newterm() call which may be called prior to initscr().
The size of the curses screen is determined by checking the tty(4) size and then the
termcap(5) entries for the terminal type. If the environment variables LINES or COLS are
set, then these will be used instead.
When either newterm() or initscr() are called, the Curses library sets up signal handlers
for SIGTSTP and SIGWINCH. If a signal handler is already installed for SIGWINCH, this will
also be called when the Curses library handler is called.
The isendwin() function can be used to determine whether or not a refresh of the screen has
occurred since the last call to endwin().
The size of the screen may be changed by calling resizeterm() with the updated number of
lines and columns. This will resize the curses internal data structures to accommodate the
changed terminal geometry. The curscr and stdscr windows and any of their subwindows will
be resized to fit the new screen size. The application must redraw the screen after a call
The setterm() function sets the terminal type for the current screen to the one passed, ini-
tialising all the curses internal data structures with information related to the named ter-
minal. The name argument must be a valid name or alias in the termcap(5) database for this
function to succeed.
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.
curses_window(3), tty(4), termcap(5), signal(7)
The NetBSD Curses library complies with the X/Open Curses specification, part of the Single
The Curses package appeared in 4.0BSD. The resizeterm() function is a ncurses extension to
the Curses library and was added in NetBSD 1.6.
BSD October 24, 2007 BSD