# resizeterm 3x

    resizeterm(3x)                                           resizeterm(3x)

## NAME

           is_term_resized,  resize_term,  resizeterm  -  change  the
           curses terminal size

## SYNOPSIS

           #include <curses.h>

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

## DESCRIPTION

           This is an extension to the curses library.   It  provides
           callers  with  a hook into the ncurses data to resize win-
           dows, primarily for use by programs running in an X Window
           terminal  (e.g.,  xterm).  The function resizeterm resizes
           the standard and current windows to the  specified  dimen-
           sions,  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 bookkeep-
           ing for the SIGWINCH handler.  When resizing the  windows,
           resize_term  blank-fills the areas that are extended.  The
           calling application should fill in these areas with appro-
           priate  data.  The resize_term function attempts to resize
           all windows.  However, due to the  calling  convention  of
           pads,  it  is  not  possible to resize these without addi-
           tional 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 win-
           dows would be modified, and FALSE otherwise.

## RETURN VALUE

           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.

## NOTES

           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  real-
           loc  may  have been interrupted, since it uses those func-
           tions.

           If ncurses is configured to supply its own  SIGWINCH  han-
           dler, 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 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 SIG-
           WINCH 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.

## SEE ALSO

           curs_variables(3x), wresize(3x).

## AUTHOR

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

                                                             resizeterm(3x)