# curs_insch 3x 2025-03-08 ncurses 6.6 Library calls

    curs_insch(3x)                   Library calls                  curs_insch(3x)

## NAME

           insch,  winsch,  mvinsch,  mvwinsch  -  insert  a curses character in a
           window

## SYNOPSIS

           #include <curses.h>

           int insch(chtype ch);
           int winsch(WINDOW * win, chtype ch);
           int mvinsch(int y, int x, chtype ch);
           int mvwinsch(WINDOW * win, int y, int x, chtype ch);

## DESCRIPTION

           winsch inserts the curses character ch at the cursor  position  in  the
           window  win.   The  character  previously  at the cursor and any to its
           right move one cell to the right; the formerly rightmost  character  on
           the  line  is discarded.  Unlike addch(3x), winsch does not advance the
           cursor.  ncurses(3x) describes the variants of this function.

## RETURN VALUE

           These functions return OK on success and ERR on failure.

           In ncurses, they return ERR if

           o   the curses screen has not been initialized, or

           o   (for functions taking a WINDOW pointer  argument)  win  is  a  null
               pointer.

           Functions  prefixed with "mv" first perform cursor movement and fail if
           the position (y, x) is outside the window boundaries.

## NOTES

           insch, mvinsch, and mvwinsch may be implemented as macros.

           curses does not  necessarily  employ  the  terminal's  insert_character
           (ich1) capability to achieve insertion.

## 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

           SVr2 (1984) introduced these functions.

## SEE ALSO

           curs_ins_wch(3x) describes comparable functions in  the  wide-character
           curses configuration.

           curses(3x), terminfo(5)

    ncurses 6.6                       2025-03-08                    curs_insch(3x)