Provided by: ncurses-doc_5.9-4_all bug


       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
       terminal  (e.g., xterm).  The function resizeterm resizes the standard 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 application should fill in these areas
       with appropriate 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
       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 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.


       curses_variables(3NCURSES), wresize(3NCURSES).


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