1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
/* 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 first record with the current key */
int heap_rlast(HP_INFO *info, byte *record, int inx)
{
HP_SHARE *share= info->s;
HP_KEYDEF *keyinfo= share->keydef + inx;
DBUG_ENTER("heap_rlast");
info->lastinx= inx;
if (keyinfo->algorithm == HA_KEY_ALG_BTREE)
{
byte *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(byte*));
info->current_ptr = pos;
memcpy(record, pos, (size_t)share->reclength);
info->update = HA_STATE_AKTIV;
}
else
{
my_errno = HA_ERR_END_OF_FILE;
DBUG_RETURN(my_errno);
}
DBUG_RETURN(0);
}
else
{
info->current_ptr=0;
info->current_hash_ptr=0;
info->update=HA_STATE_NEXT_FOUND;
DBUG_RETURN(heap_rprev(info,record));
}
}
|
