~drizzle-trunk/drizzle/development

/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2008 Sun Microsystems

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; version 2 of the License.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

 */

#include <drizzled/server_includes.h>

#include CSTDINT_H

#include <drizzled/function/str/weight_string.h>

#include <algorithm>

using namespace std;

void Item_func_weight_string::fix_length_and_dec()

{

  const CHARSET_INFO * const cs= args[0]->collation.collation;

  collation.set(&my_charset_bin, args[0]->collation.derivation);

  flags= my_strxfrm_flag_normalize(flags, cs->levels_for_order);

  max_length= cs->mbmaxlen * max(args[0]->max_length, nweights);

  maybe_null= 1;

}

/* Return a weight_string according to collation */

String *Item_func_weight_string::val_str(String *str)

{

  String *res;

  const CHARSET_INFO * const cs= args[0]->collation.collation;

  uint32_t tmp_length, frm_length;

  assert(fixed == 1);

  if (args[0]->result_type() != STRING_RESULT ||

      !(res= args[0]->val_str(str)))

    goto nl;

  tmp_length= cs->coll->strnxfrmlen(cs, cs->mbmaxlen *

                                        max(res->length(), nweights));

  if (tmp_value.alloc(tmp_length))

    goto nl;

  frm_length= cs->coll->strnxfrm(cs,

                                 (unsigned char*) tmp_value.ptr(), tmp_length,

                                 nweights ? nweights : tmp_length,

                                 (const unsigned char*) res->ptr(), res->length(),

                                 flags);

  tmp_value.length(frm_length);

  null_value= 0;

  return &tmp_value;

nl:

  null_value= 1;

  return 0;

}