curs_insch(3x) — Linux manual page

curs_insch(3X)                Library calls                curs_insch(3X)

NAME         top

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

SYNOPSIS         top

       #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         top

       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         top

       These functions return OK on success and ERR on failure.

       In ncurses, they return ERR if

       •   the curses screen has not been initialized, or

       •   (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         top

       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         top

       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         top

       SVr2 (1984) introduced these functions.

SEE ALSO         top

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

       curses(3X), terminfo(5)

COLOPHON         top

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ncurses @NCURSES_MAJOR@.@NCU... 2025-03-08                 curs_insch(3X)

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