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  • Committer: Bazaar Package Importer
  • Author(s): Monty Taylor
  • Date: 2010-03-18 12:12:31 UTC
  • Revision ID: james.westby@ubuntu.com-20100318121231-k6g1xe6cshbwa0f8
Tags: upstream-2010.03.1347
Import upstream version 2010.03.1347

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plugin/heap/hp_rlast.cc
 
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/* Copyright (C) 2000-2002 MySQL AB
 
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   This program is free software; you can redistribute it and/or modify
 
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   it under the terms of the GNU General Public License as published by
 
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   the Free Software Foundation; version 2 of the License.
 
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   This program is distributed in the hope that it will be useful,
 
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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   GNU General Public License for more details.
 
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   You should have received a copy of the GNU General Public License
 
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   along with this program; if not, write to the Free Software
 
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   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
 
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#include "heap_priv.h"
 
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#include <string.h>
 
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        /* Read first record with the current key */
 
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using namespace drizzled;
 
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int heap_rlast(HP_INFO *info, unsigned char *record, int inx)
 
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{
 
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  HP_SHARE *share=    info->s;
 
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  HP_KEYDEF *keyinfo= share->keydef + inx;
 
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  info->lastinx= inx;
 
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  if (keyinfo->algorithm == HA_KEY_ALG_BTREE)
 
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  {
 
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    unsigned char *pos;
 
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    if ((pos = (unsigned char *)tree_search_edge(&keyinfo->rb_tree,
 
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                                                 info->parents,
 
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                                                 &info->last_pos,
 
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                                                 offsetof(TREE_ELEMENT, right))))
 
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    {
 
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      memcpy(&pos, pos + (*keyinfo->get_key_length)(keyinfo, pos),
 
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             sizeof(unsigned char*));
 
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      info->current_ptr = pos;
 
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      hp_extract_record(share, record, pos);
 
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      info->update = HA_STATE_AKTIV;
 
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    }
 
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    else
 
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    {
 
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      errno = HA_ERR_END_OF_FILE;
 
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      return(errno);
 
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    }
 
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    return(0);
 
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  }
 
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  else
 
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  {
 
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    info->current_ptr=0;
 
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    info->current_hash_ptr=0;
 
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    info->update=HA_STATE_NEXT_FOUND;
 
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    return(heap_rprev(info,record));
 
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  }
 
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}