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61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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; either version 2 of the License, or
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(at your option) any later version.
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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 "heapdef.h"
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/* Read first record with the current key */
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int heap_rfirst(HP_INFO *info, byte *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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DBUG_ENTER("heap_rfirst");
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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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byte *pos;
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if ((pos = tree_search_edge(&keyinfo->rb_tree, info->parents,
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&info->last_pos, offsetof(TREE_ELEMENT, left))))
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{
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memcpy(&pos, pos + (*keyinfo->get_key_length)(keyinfo, pos),
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sizeof(byte*));
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info->current_ptr = pos;
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memcpy(record, pos, (size_t)share->reclength);
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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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my_errno = HA_ERR_END_OF_FILE;
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DBUG_RETURN(my_errno);
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}
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DBUG_RETURN(0);
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}
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else
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{
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if (!(info->s->records))
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{
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my_errno=HA_ERR_END_OF_FILE;
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DBUG_RETURN(my_errno);
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}
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DBUG_ASSERT(0); /* TODO fix it */
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info->current_record=0;
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info->current_hash_ptr=0;
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info->update=HA_STATE_PREV_FOUND;
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DBUG_RETURN(heap_rnext(info,record));
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}
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}
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