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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 such  as
       the LINES and COLS variables.

       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 noted, these functions 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.


SEE ALSO

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


AUTHOR

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



                                                         resizeterm(3x)

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