Provided by: ncurses-doc_6.2-0ubuntu2_all bug


       form - curses extension for programming forms


       #include <form.h>


       The  form  library  provides terminal-independent facilities for composing form screens on
       character-cell terminals.  The library includes: field routines, which create  and  modify
       form  fields;  and  form  routines,  which  group  fields into forms, display forms on the
       screen, and handle interaction with the user.

       The form library uses the curses libraries.  To  use  the  form  library,  link  with  the
       options -lform -lcurses.

       Your program should set up the locale, e.g.,

            setlocale(LC_ALL, "");

       so that input/output processing will work.

       A  curses  initialization routine such as initscr must be called before using any of these

   Current Default Values for Field Attributes
       The form library maintains a default value for field attributes.  You can get or set  this
       default  by  calling  the appropriate set_ or retrieval routine with a NULL field pointer.
       Changing this default with a set_ function affects future field creations,  but  does  not
       change the rendering of fields already created.

   Routine Name Index
       The following table lists each form routine and the name of the manual page on which it is

       curses Routine Name     Manual Page Name
       current_field           page(3FORM)
       data_ahead              data(3FORM)
       data_behind             data(3FORM)
       dup_field               field_new(3FORM)
       dynamic_field_info      field_info(3FORM)
       field_arg               field_validation(3FORM)
       field_back              field_attributes(3FORM)
       field_buffer            field_buffer(3FORM)
       field_count             field(3FORM)
       field_fore              field_attributes(3FORM)
       field_index             page(3FORM)
       field_info              field_info(3FORM)
       field_init              hook(3FORM)
       field_just              field_just(3FORM)
       field_opts              field_opts(3FORM)
       field_opts_off          field_opts(3FORM)
       field_opts_on           field_opts(3FORM)
       field_pad               field_attributes(3FORM)
       field_status            field_buffer(3FORM)
       field_term              hook(3FORM)
       field_type              field_validation(3FORM)
       field_userptr           field_userptr(3FORM)
       form_driver             driver(3FORM)
       form_driver_w           driver(3FORM)*
       form_fields             field(3FORM)

       form_init               hook(3FORM)
       form_opts               opts(3FORM)
       form_opts_off           opts(3FORM)
       form_opts_on            opts(3FORM)
       form_page               page(3FORM)
       form_request_by_name    requestname(3FORM)
       form_request_name       requestname(3FORM)
       form_sub                win(3FORM)
       form_term               hook(3FORM)
       form_userptr            userptr(3FORM)
       form_win                win(3FORM)
       free_field              field_new(3FORM)
       free_fieldtype          fieldtype(3FORM)
       free_form               new(3FORM)
       link_field              field_new(3FORM)
       link_fieldtype          fieldtype(3FORM)
       move_field              field(3FORM)
       new_field               field_new(3FORM)
       new_fieldtype           fieldtype(3FORM)
       new_form                new(3FORM)
       new_page                new_page(3FORM)
       pos_form_cursor         cursor(3FORM)
       post_form               post(3FORM)
       scale_form              win(3FORM)
       set_current_field       page(3FORM)
       set_field_back          field_attributes(3FORM)
       set_field_buffer        field_buffer(3FORM)
       set_field_fore          field_attributes(3FORM)
       set_field_init          hook(3FORM)
       set_field_just          field_just(3FORM)
       set_field_opts          field_opts(3FORM)
       set_field_pad           field_attributes(3FORM)
       set_field_status        field_buffer(3FORM)
       set_field_term          hook(3FORM)
       set_field_type          field_validation(3FORM)
       set_field_userptr       field_userptr(3FORM)
       set_fieldtype_arg       fieldtype(3FORM)
       set_fieldtype_choice    fieldtype(3FORM)
       set_form_fields         field(3FORM)
       set_form_init           hook(3FORM)
       set_form_opts           field_opts(3FORM)
       set_form_page           page(3FORM)
       set_form_sub            win(3FORM)
       set_form_term           hook(3FORM)
       set_form_userptr        userptr(3FORM)
       set_form_win            win(3FORM)
       set_max_field           field_buffer(3FORM)
       set_new_page            new_page(3FORM)
       unfocus_current_field   page(3FORM)
       unpost_form             post(3FORM)


       Routines that return pointers return NULL on error, and set  errno  to  the  corresponding
       error-code  returned  by  functions returning an integer.  Routines that return an integer
       return one of the following error codes:

       E_OK The routine succeeded.

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

            Routine was called from an initialization or termination function.

            The field is already connected to a form.

            Contents of a field are not valid.

            No fields are connected to the form.

            The form has not been posted.

            Form is too large for its window.

            The form is already posted.

            The form driver could not process the request.

            System error occurred (see errno(3)).

            The form driver code saw an unknown request code.


       The header file <form.h> automatically includes the header files <curses.h> and <eti.h>.

       In your library list, libform.a should be before libncurses.a; that is, you  want  to  say
       “-lform -lncurses”, not the other way around (which would give you a link error when using
       static libraries).


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

       The  menu  facility was documented in SVr4.2 in Character User Interface Programming (UNIX

       It is not part of X/Open Curses.

       Aside from ncurses, there are few implementations:

       ·   systems based on SVr4 source code, e.g., Solaris.

       ·   NetBSD curses.

       A few functions in this implementation are extensions added for ncurses, but not  provided
       by other implementations, e.g., form_driver_w, unfocus_current_field.


       Juergen Pfeifer.  Manual pages and adaptation for ncurses by Eric S. Raymond.


       ncurses(3NCURSES) and related pages whose names begin “form_” for detailed descriptions of
       the entry points.

       This describes ncurses version 6.2 (patch 20200212).