int set_current_field(FORM *form, FIELD *field);
FIELD *current_field(const FORM *);
int unfocus_current_field(FORM *form);
int set_form_page(FORM *form, int n);
int form_page(const FORM *form);
int field_index(const FIELD *field);
The function set_current_field sets the current field of the given
form; current_field returns the current field of the given form.
The function unfocus_current_field removes the focus from the current
field of the form. In such state, inquiries via current_field shall
return a NULL pointer.
The function set_form_page sets the form's page number (goes to page
n of the form).
The function form_page returns the form's current page number.
The function field_index returns the index of the field in the field
array of the form it is connected to. It returns ERR if the argument
is the null pointer or the field is not connected.
Except for form_page, each routine returns one of the following:
E_OK The routine succeeded.
Routine detected an incorrect or out-of-range argument.
Routine was called from an initialization or termination
Contents of a field are not valid.
The form driver could not process the request.
System error occurred (see errno).
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