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106 lines
3.1 KiB
C
106 lines
3.1 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 from a random position */
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#include "heapdef.h"
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/*
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Returns one of following values:
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0 = Ok.
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HA_ERR_RECORD_DELETED = Record is deleted.
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HA_ERR_END_OF_FILE = EOF.
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*/
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int heap_rrnd(register HP_INFO *info, byte *record, byte *pos)
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{
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HP_SHARE *share=info->s;
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DBUG_ENTER("heap_rrnd");
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DBUG_PRINT("enter",("info: %lx pos: %lx",info,pos));
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info->lastinx= -1;
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if (!(info->current_ptr= pos))
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{
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info->update= 0;
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DBUG_RETURN(my_errno= HA_ERR_END_OF_FILE);
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}
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if (!info->current_ptr[share->reclength])
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{
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info->update= HA_STATE_PREV_FOUND | HA_STATE_NEXT_FOUND;
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DBUG_RETURN(my_errno=HA_ERR_RECORD_DELETED);
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}
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info->update=HA_STATE_PREV_FOUND | HA_STATE_NEXT_FOUND | HA_STATE_AKTIV;
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memcpy(record,info->current_ptr,(size_t) share->reclength);
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DBUG_PRINT("exit",("found record at %lx",info->current_ptr));
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info->current_hash_ptr=0; /* Can't use rnext */
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DBUG_RETURN(0);
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} /* heap_rrnd */
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#ifdef WANT_OLD_HEAP_VERSION
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/*
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If pos == -1 then read next record
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Returns one of following values:
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0 = Ok.
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HA_ERR_RECORD_DELETED = Record is deleted.
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HA_ERR_END_OF_FILE = EOF.
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*/
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int heap_rrnd_old(register HP_INFO *info, byte *record, ulong pos)
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{
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HP_SHARE *share=info->s;
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DBUG_ENTER("heap_rrnd");
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DBUG_PRINT("enter",("info: %lx pos: %ld",info,pos));
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info->lastinx= -1;
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if (pos == (ulong) -1)
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{
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pos= ++info->current_record;
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if (pos % share->block.records_in_block && /* Quick next record */
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pos < share->records+share->deleted &&
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(info->update & HA_STATE_PREV_FOUND))
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{
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info->current_ptr+=share->block.recbuffer;
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goto end;
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}
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}
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else
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info->current_record=pos;
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if (pos >= share->records+share->deleted)
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{
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info->update= 0;
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DBUG_RETURN(my_errno= HA_ERR_END_OF_FILE);
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}
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/* Find record number pos */
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_hp_find_record(info,pos);
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end:
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if (!info->current_ptr[share->reclength])
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{
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info->update= HA_STATE_PREV_FOUND | HA_STATE_NEXT_FOUND;
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DBUG_RETURN(my_errno=HA_ERR_RECORD_DELETED);
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}
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info->update=HA_STATE_PREV_FOUND | HA_STATE_NEXT_FOUND | HA_STATE_AKTIV;
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memcpy(record,info->current_ptr,(size_t) share->reclength);
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DBUG_PRINT("exit",("found record at %lx",info->current_ptr));
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info->current_hash_ptr=0; /* Can't use rnext */
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DBUG_RETURN(0);
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} /* heap_rrnd */
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#endif /* WANT_OLD_HEAP_VERSION */
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