~drizzle-trunk/drizzle/development

/* Copyright (C) 2000-2002 MySQL AB

   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

#include "heapdef.h"

#include <string.h>

	/* Read first record with the current key */

int heap_rlast(HP_INFO *info, unsigned char *record, int inx)

{

  HP_SHARE *share=    info->s;

  HP_KEYDEF *keyinfo= share->keydef + inx;

  info->lastinx= inx;

  if (keyinfo->algorithm == HA_KEY_ALG_BTREE)

  {

    unsigned char *pos;

    if ((pos = tree_search_edge(&keyinfo->rb_tree, info->parents,

                                &info->last_pos, offsetof(TREE_ELEMENT, right))))

    {

      memcpy(&pos, pos + (*keyinfo->get_key_length)(keyinfo, pos),

	     sizeof(unsigned char*));

      info->current_ptr = pos;

      hp_extract_record(share, record, pos);

      info->update = HA_STATE_AKTIV;

    }

    else

    {

      my_errno = HA_ERR_END_OF_FILE;

      return(my_errno);

    }

    return(0);

  }

  else

  {

    info->current_ptr=0;

    info->current_hash_ptr=0;

    info->update=HA_STATE_NEXT_FOUND;

    return(heap_rprev(info,record));

  }

}