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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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; either version 2 of the License, or
(at your option) any later version.
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"
/* Read prev record for key */
int heap_rprev(HP_INFO *info, byte *record)
{
byte *pos;
HP_SHARE *share=info->s;
DBUG_ENTER("heap_rprev");
if (info->lastinx < 0)
DBUG_RETURN(my_errno=HA_ERR_WRONG_INDEX);
if (info->current_ptr || (info->update & HA_STATE_NEXT_FOUND))
{
if ((info->update & HA_STATE_DELETED))
pos= _hp_search(info,share->keydef+info->lastinx, info->lastkey, 3);
else
pos= _hp_search(info,share->keydef+info->lastinx, info->lastkey, 2);
}
else
{
pos=0; /* Read next after last */
my_errno=HA_ERR_KEY_NOT_FOUND;
}
if (!pos)
{
info->update=HA_STATE_PREV_FOUND; /* For heap_rprev */
if (my_errno == HA_ERR_KEY_NOT_FOUND)
my_errno=HA_ERR_END_OF_FILE;
DBUG_RETURN(my_errno);
}
memcpy(record,pos,(size_t) share->reclength);
info->update=HA_STATE_AKTIV | HA_STATE_PREV_FOUND;
DBUG_RETURN(0);
}
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