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plugin/heap/hp_rprev.cc
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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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */
 
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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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using namespace drizzled;
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        /* Read prev record for key */
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int heap_rprev(HP_INFO *info, unsigned char *record)
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{
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  unsigned char *pos;
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  HP_SHARE *share=info->getShare();
 
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  HP_SHARE *share=info->s;
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  HP_KEYDEF *keyinfo;
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  if (info->lastinx < 0)
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    return(errno=HA_ERR_WRONG_INDEX);
 
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    return(my_errno=HA_ERR_WRONG_INDEX);
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  keyinfo = share->keydef + info->lastinx;
 
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  if (keyinfo->algorithm == HA_KEY_ALG_BTREE)
 
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  {
 
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    heap_rb_param custom_arg;
 
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    if (info->last_pos)
 
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      pos = (unsigned char *)tree_search_next(&keyinfo->rb_tree,
 
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                                              &info->last_pos,
 
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                                              offsetof(TREE_ELEMENT, right),
 
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                                              offsetof(TREE_ELEMENT, left));
 
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    else
 
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    {
 
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      custom_arg.keyseg = keyinfo->seg;
 
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      custom_arg.key_length = keyinfo->length;
 
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      custom_arg.search_flag = SEARCH_SAME;
 
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      pos = (unsigned char *)tree_search_key(&keyinfo->rb_tree,
 
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                                             info->lastkey, info->parents,
 
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                                             &info->last_pos,
 
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                                             info->last_find_flag,
 
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                                             &custom_arg);
 
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    }
 
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    if (pos)
 
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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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    }
 
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    else
 
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    {
 
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      my_errno = HA_ERR_KEY_NOT_FOUND;
 
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    }
 
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  }
 
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  else
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  {
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    if (info->current_ptr || (info->update & HA_STATE_NEXT_FOUND))
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    {
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      if ((info->update & HA_STATE_DELETED))
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        pos= hp_search(info, share->keydef + info->lastinx, &info->lastkey[0], 3);
 
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        pos= hp_search(info, share->keydef + info->lastinx, info->lastkey, 3);
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      else
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        pos= hp_search(info, share->keydef + info->lastinx, &info->lastkey[0], 2);
 
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        pos= hp_search(info, share->keydef + info->lastinx, info->lastkey, 2);
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    }
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    else
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    {
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      pos=0;                                    /* Read next after last */
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      errno=HA_ERR_KEY_NOT_FOUND;
 
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      my_errno=HA_ERR_KEY_NOT_FOUND;
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    }
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  }
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  if (!pos)
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  {
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    info->update=HA_STATE_PREV_FOUND;           /* For heap_rprev */
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    if (errno == HA_ERR_KEY_NOT_FOUND)
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      errno=HA_ERR_END_OF_FILE;
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    return(errno);
 
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    if (my_errno == HA_ERR_KEY_NOT_FOUND)
 
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      my_errno=HA_ERR_END_OF_FILE;
 
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    return(my_errno);
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  }
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  hp_extract_record(share, record, pos);
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  info->update=HA_STATE_AKTIV | HA_STATE_PREV_FOUND;