1/* Copyright (c) 2000-2002, 2005-2007 MySQL AB
2 Use is subject to license terms
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; version 2 of the License.
7
8 This program is distributed in the hope that it will be useful,
9 but WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 GNU General Public License for more details.
12
13 You should have received a copy of the GNU General Public License
14 along with this program; if not, write to the Free Software
15 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */
16
17/* Scan through all rows */
18
19#include "heapdef.h"
20
21/*
22 Returns one of following values:
23 0 = Ok.
24 HA_ERR_RECORD_DELETED = Record is deleted.
25 HA_ERR_END_OF_FILE = EOF.
26*/
27
28int heap_scan_init(register HP_INFO *info)
29{
30 DBUG_ENTER("heap_scan_init");
31 info->lastinx= -1;
32 info->current_record= (ulong) ~0L; /* No current record */
33 info->update=0;
34 info->next_block=0;
35 info->key_version= info->s->key_version;
36 info->file_version= info->s->file_version;
37 DBUG_RETURN(0);
38}
39
40int heap_scan(register HP_INFO *info, uchar *record)
41{
42 HP_SHARE *share=info->s;
43 ulong pos;
44 DBUG_ENTER("heap_scan");
45
46 pos= ++info->current_record;
47 if (pos < info->next_block)
48 {
49 info->current_ptr+=share->block.recbuffer;
50 }
51 else
52 {
53 info->next_block+=share->block.records_in_block;
54 if (info->next_block >= share->records+share->deleted)
55 {
56 info->next_block= share->records+share->deleted;
57 if (pos >= info->next_block)
58 {
59 info->update= 0;
60 DBUG_RETURN(my_errno= HA_ERR_END_OF_FILE);
61 }
62 }
63 hp_find_record(info, pos);
64 }
65 if (!info->current_ptr[share->visible])
66 {
67 DBUG_PRINT("warning",("Found deleted record"));
68 info->update= HA_STATE_PREV_FOUND | HA_STATE_NEXT_FOUND;
69 DBUG_RETURN(my_errno=HA_ERR_RECORD_DELETED);
70 }
71 info->update= HA_STATE_PREV_FOUND | HA_STATE_NEXT_FOUND | HA_STATE_AKTIV;
72 memcpy(record,info->current_ptr,(size_t) share->reclength);
73 info->current_hash_ptr=0; /* Can't use read_next */
74 DBUG_RETURN(0);
75} /* heap_scan */
76