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

       wresize(3x).

AUTHOR

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



                                                         resizeterm(3x)