Страницы справочника OS X

Эта страница руководства является частью версии 5.0 Инструментов XCode

Читать страницы руководства

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 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 book-keeping bookkeeping
       keeping  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.

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 realloc may have been inter-rupted, interrupted,
       rupted, 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.

SEE ALSO
       wresize(3X).

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



                                                                                              resizeterm(3X)