Method copy

sql/item.cc:419–452

void Name_string::copy(const char *str, size_t length, const CHARSET_INFO *cs)
{
  if (!length)
  {
    /* Empty string, used by AS or internal function like last_insert_id() */
    set(str ? "" : NULL, 0);
    return;
  }
  if (cs->ctype)
  {
    /*
      This will probably need a better implementation in the future:
      a function in CHARSET_INFO structure.
    */
    while (length && !my_isgraph(cs, *str))
    {						// Fix problem with yacc
      length--;
      str++;
    }
  }
  if (!my_charset_same(cs, system_charset_info))
  {
    size_t res_length;
    char *tmp= sql_strmake_with_convert(str, length, cs, MAX_ALIAS_NAME,
                                        system_charset_info, &res_length);
    set(tmp, tmp ? res_length : 0);
  }
  else
  {
    size_t len= min<size_t>(length, MAX_ALIAS_NAME);
    char *tmp= sql_strmake(str, len);
    set(tmp, tmp ? len : 0);
  }
}


void Item_name_string::copy(const char *str_arg, size_t length_arg,