form_win - make and break form window and subwindow associations


   #include <form.h>
   int set_form_win(FORM *form, WINDOW *win);
   WINDOW *form_win(const FORM *form);
   int set_form_sub(FORM *form, WINDOW *sub);
   WINDOW *form_sub(const FORM *form);
   int scale_form(const FORM *form, int *rows, int *columns);


   Every  form  has an associated pair of curses windows.  The form window
   displays any title and border associated  with  the  window;  the  form
   subwindow  displays  the items of the form that are currently available
   for selection.

   The first four  functions  get  and  set  those  windows.   It  is  not
   necessary to set either window; by default, the driver code uses stdscr
   for both.

   In the set_ functions, window argument of NULL is treated as though  it
   were stsdcr.  A form argument of NULL is treated as a request to change
   the system default form window or subwindow.

   The function scale_form returns  the  minimum  size  required  for  the
   subwindow of form.


   Routines  that  return  pointers  return  NULL on error.  Routines that
   return an integer return one of the following error codes:

   E_OK The routine succeeded.

        System error occurred (see errno).

        Routine detected an incorrect or out-of-range argument.

        The form has already been posted.

        No items are connected to the form.


   ncurses(3NCURSES), curses_variables(3NCURSES), form(3FORM).


   The  header  file  <form.h>  automatically  includes  the  header  file


   These  routines  emulate  the  System  V  forms library.  They were not
   supported on Version 7 or BSD versions.


   Juergen Pfeifer.  Manual pages and adaptation for new curses by Eric S.



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