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55 lines
1.7 KiB
C
55 lines
1.7 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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/* Read a record with random-access. The position to the record must
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get by N_INFO. The next record can be read with pos= -1 */
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#include "isamdef.h"
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/*
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If filepos == NI_POS_ERROR, read next
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Returns:
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0 = Ok.
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1 = Row was deleted
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-1 = EOF (check errno to verify)
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*/
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int nisam_rrnd(N_INFO *info, byte *buf, register ulong filepos)
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{
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int skipp_deleted_blocks;
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DBUG_ENTER("nisam_rrnd");
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skipp_deleted_blocks=0;
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if (filepos == NI_POS_ERROR)
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{
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skipp_deleted_blocks=1;
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if (info->lastpos == NI_POS_ERROR) /* First read ? */
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filepos= info->s->pack.header_length; /* Read first record */
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else
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filepos= info->nextpos;
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}
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info->lastinx= -1; /* Can't forward or backward */
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/* Init all but update-flag */
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info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);
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if (info->opt_flag & WRITE_CACHE_USED && flush_io_cache(&info->rec_cache))
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DBUG_RETURN(my_errno);
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DBUG_RETURN ((*info->s->read_rnd)(info,buf,filepos,skipp_deleted_blocks));
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}
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