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  • Committer: Monty Taylor
  • Date: 2010-09-28 07:45:44 UTC
  • mto: (1799.1.2 build)
  • mto: This revision was merged to the branch mainline in revision 1800.
  • Revision ID: mordred@inaugust.com-20100928074544-s3ujnv6s8wro74l2
Added BSD copying file.

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plugin/memory/hp_rrnd.cc
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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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */
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/* Read a record from a random position */
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#include "heap_priv.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, unsigned char *record, unsigned char *pos)
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{
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  HP_SHARE *share=info->getShare();
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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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    return(errno= HA_ERR_END_OF_FILE);
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  }
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  if (get_chunk_status(&share->recordspace, info->current_ptr) != CHUNK_STATUS_ACTIVE)
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  {
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    /* treat deleted and linked chunks as deleted */
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    info->update= HA_STATE_PREV_FOUND | HA_STATE_NEXT_FOUND;
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    return(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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  hp_extract_record(share, record, info->current_ptr);
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  info->current_hash_ptr=0;                     /* Can't use rnext */
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  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, unsigned char *record, uint32_t pos)
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{
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  HP_SHARE *share=info->s;
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asdfasdf;
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  info->lastinx= -1;
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  if (pos == (uint32_t) -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->used_chunk_count+share->deleted_chunk_count &&
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            (info->update & HA_STATE_PREV_FOUND))
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    {
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      info->current_ptr+=share->block.recbufferlen;
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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->used_chunk_count+share->deleted_chunk_count)
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  {
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    info->update= 0;
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    return(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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    return(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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  info->current_hash_ptr=0;                     /* Can't use rnext */
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  return(0);
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} /* heap_rrnd */
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#endif /* WANT_OLD_HEAP_VERSION */