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Viewing changes to storage/heap/hp_rrnd.c

  • Committer: brian
  • Date: 2008-06-25 05:29:13 UTC
  • Revision ID: brian@localhost.localdomain-20080625052913-6upwo0jsrl4lnapl
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storage/heap/hp_rrnd.c
 
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/* Copyright (C) 2000-2002, 2004, 2006 MySQL 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; version 2 of the License.
 
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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, uchar *record, uchar *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: 0x%lx  pos: %lx",(long) info, (long) 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 0x%lx", (long) 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, uchar *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: 0x%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 0x%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 */