Function do_cut_string_complex

sql/field_conv.cc:502–529

*/

static void do_cut_string_complex(const Copy_field *copy)
{						// Shorter string field
  CHARSET_INFO *cs= copy->from_field->charset();
  const uchar *from_end= copy->from_ptr + copy->from_length;
  Well_formed_prefix prefix(cs,
                           (char*) copy->from_ptr,
                           (char*) from_end,
                           copy->to_length / cs->mbmaxlen);
  size_t copy_length= prefix.length();
  if (copy->to_length < copy_length)
    copy_length= copy->to_length;
  memcpy(copy->to_ptr, copy->from_ptr, copy_length);

  /* Check if we lost any important characters */
  if (unlikely(prefix.well_formed_error_pos() ||
               cs->scan((char*) copy->from_ptr + copy_length,
                        (char*) from_end,
                        MY_SEQ_SPACES) <
               (copy->from_length - copy_length)))
  {
    copy->to_field->set_warning(Sql_condition::WARN_LEVEL_WARN,
                                WARN_DATA_TRUNCATED, 1);
  }

  if (copy_length < copy->to_length)
    cs->fill((char*) copy->to_ptr + copy_length,
             copy->to_length - copy_length, ' ');
}