MirBSD manpage: is_term_resized(3), resizeterm(3), resize_term(3)

resizeterm(3)       UNIX Programmer's Manual        resizeterm(3)


     is_term_resized, resize_term, resizeterm - change the curses
     terminal size


     #include <curses.h>

     bool is_term_resized(int lines, int columns);
     int resize_term(int lines, int columns);
     int resizeterm(int lines, int columns);


     This is an extension to the curses library. It provides
     callers with a hook into the ncurses data to resize windows,
     primarily for use by programs running in an X Window termi-
     nal (e.g., xterm). The function resizeterm resizes the stan-
     dard and current windows to the specified dimensions, and
     adjusts other bookkeeping data used by the ncurses library
     that record the window dimensions.

     Most of the work is done by the inner function resize_term.
     The outer function resizeterm adds bookkeeping for the
     SIGWINCH handler. When resizing the windows, resize_term
     blank-fills the areas that are extended. The calling appli-
     cation should fill in these areas with appropriate data. The
     resize_term function attempts to resize all windows. How-
     ever, due to the calling convention of pads, it is not pos-
     sible to resize these without additional interaction with
     the application.

     A support function is_term_resized is provided so that
     applications can check if the resize_term function would
     modify the window structures. It returns TRUE if the windows
     would be modified, and FALSE otherwise.


     Except as notes, these function return the integer ERR upon
     failure and OK on success. They will fail if either of the
     dimensions are less than or equal to zero, or if an error
     occurs while (re)allocating memory for the windows.


     While these functions are intended to be used to support a
     signal handler (i.e., for SIGWINCH), care should be taken to
     avoid invoking them in a context where malloc or realloc may
     have been interrupted, since it uses those functions.

     If ncurses is configured to supply its own SIGWINCH handler,
     the resizeterm function ungetch's a KEY_RESIZE which will be
     read on the next call to getch. This is used to alert an
     application that the screen size has changed, and that it
     should repaint special features such as pads that cannot be

MirBSD #10-current     Printed 2022-12-23                       1

resizeterm(3)       UNIX Programmer's Manual        resizeterm(3)

     done automatically.

     If the environment variables LINES or COLUMNS are set, this
     overrides the library's use of the window size obtained from
     the operating system. Thus, even if a SIGWINCH is received,
     no screen size change may be recorded. In that case, no
     KEY_RESIZE is queued for the next call to getch; an ERR will
     be returned instead.




     Thomas Dickey (from an equivalent function written in 1988
     for BSD curses).

MirBSD #10-current     Printed 2022-12-23                       2

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