form_page() returns -1 on error.
current_field() returns NULL on error.
field_index() returns -1 on error.
set_form_page() and set_current_field() return one of the following:
- E_OK
- The function returned successfully.
- E_SYSTEM_ERROR
- System error.
- E_BAD_ARGUMENT
- An argument is incorrect.
- E_BAD_STATE
- The routine was called from an initialization or termination function.
- E_INVALID_FIELD
- The field contents are invalid.
- E_REQUEST_DENIED
- The form driver request failed
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