1/* Copyright (c) 2000, 2001, 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/* Read through all rows sequntially */
18
19#include "myisamdef.h"
20
21int mi_scan_init(register MI_INFO *info)
22{
23 DBUG_ENTER("mi_scan_init");
24 info->nextpos=info->s->pack.header_length; /* Read first record */
25 info->lastinx= -1; /* Can't forward or backward */
26 if (info->opt_flag & WRITE_CACHE_USED && flush_io_cache(&info->rec_cache))
27 DBUG_RETURN(my_errno);
28 DBUG_RETURN(0);
29}
30
31/*
32 Read a row based on position.
33 If filepos= HA_OFFSET_ERROR then read next row
34 Return values
35 Returns one of following values:
36 0 = Ok.
37 HA_ERR_END_OF_FILE = EOF.
38*/
39
40int mi_scan(MI_INFO *info, uchar *buf)
41{
42 DBUG_ENTER("mi_scan");
43 /* Init all but update-flag */
44 info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);
45 DBUG_RETURN ((*info->s->read_rnd)(info,buf,info->nextpos,1));
46}
47