set_field_userptr(f, (void *) ptr);
set_field_buffer(f, 0, value); /* will be formatted */
set_field_buffer(f, 1, value); /* will be unformatted */
set_field_userptr(f, (void *) ptr);
set_field_buffer(f, 0, value); /* will be formatted */
set_field_buffer(f, 1, value); /* will be unformatted */