resizeterm 3x

resizeterm(3x)                                           resizeterm(3x)


       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 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.


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

       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.


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


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


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