# curs_deleteln 3x 2025-07-05 ncurses 6.6 Library calls

    curs_deleteln(3x)                Library calls               curs_deleteln(3x)

## NAME

           deleteln,  wdeleteln, insertln, winsertln, insdelln, winsdelln - delete
           or insert lines in a curses window

## SYNOPSIS

           #include <curses.h>

           int deleteln(void);
           int wdeleteln(WINDOW * win);

           int insertln(void);
           int winsertln(WINDOW * win);

           int insdelln(int n);
           int winsdelln(WINDOW * win, int n);

## DESCRIPTION

           wdeleteln deletes the line at the cursor in win;  all  lines  below  it
           move  up  one  line.  curses then fills the bottom line of win with the
           background character configured  by  wbkgdset(3x)  (wide-character  API
           users: wbkgrndset(3x)).  The cursor position does not change.

           winsertln inserts a new, empty line of characters above the line at the
           cursor in win, shifting the existing lines down by one.  The content of
           the  window's  bottom  line is lost; curses fills the new line with the
           background character.  The cursor position does not change.

           winsdelln inserts or deletes  n lines  in  win  as  n  is  positive  or
           negative,  respectively,  as  if  by  repeatedly  calling  winsertln or
           wdeleteln.  winsdelln(..., 0) performs no operation.

## RETURN VALUE

           These functions return OK on success and ERR on failure.

           In ncurses, they fail if win is NULL.

## NOTES

           All of these functions except winsdelln may be implemented as macros.

           These functions do not require the terminal to  possess  hardware  line
           deletion  or  insertion  capabilities.   Even  if available, by default
           curses does not use them; see idlok(3x).

## PORTABILITY

           X/Open Curses Issue 4 describes these functions.  It specifies no error
           conditions for them.

           SVr4 describes a successful return value  only  as  "an  integer  value
           other than ERR".

## HISTORY

           4BSD (1980) introduced deleteln, wdeleteln, insertln, and winsertln.

           SVr3.1 (1987) added insdelln and winsdelln.

## SEE ALSO

           curses(3x)

    ncurses 6.6                       2025-07-05                 curs_deleteln(3x)