text: /* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
     
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2 of the License, or
     (at your option) any later version.
     
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
     
     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software
     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
  
  /* Scan through all rows */
  
  #include "heapdef.h"
  
  /*
  	   Returns one of following values:
  	   0 = Ok.
  	   HA_ERR_RECORD_DELETED = Record is deleted.
  	   HA_ERR_END_OF_FILE = EOF.
  */
  
  int heap_scan_init(register HP_INFO *info)
  {
    DBUG_ENTER("heap_scan_init");
    info->lastinx= -1;
    info->current_record= (ulong) ~0L;		/* No current record */
    info->update=0;
    info->next_block=0;
    DBUG_RETURN(0);
  }
  
  int heap_scan(register HP_INFO *info, byte *record)
  {
    HP_SHARE *share=info->s;
    ulong pos;
    DBUG_ENTER("heap_scan");
  
    pos= ++info->current_record;
    if (pos < info->next_block)
    {
      info->current_ptr+=share->block.recbuffer;
    }
    else
    {
      info->next_block+=share->block.records_in_block;
      if (info->next_block >= share->records+share->deleted)
      {
        info->next_block= share->records+share->deleted;
        if (pos >= info->next_block)
        {
  	info->update= 0;
  	DBUG_RETURN(my_errno= HA_ERR_END_OF_FILE);
        }
      }
      _hp_find_record(info,pos);
    }
    if (!info->current_ptr[share->reclength])
    {
      info->update= HA_STATE_PREV_FOUND | HA_STATE_NEXT_FOUND;
      DBUG_RETURN(my_errno=HA_ERR_RECORD_DELETED);
    }
    info->update= HA_STATE_PREV_FOUND | HA_STATE_NEXT_FOUND | HA_STATE_AKTIV;
    memcpy(record,info->current_ptr,(size_t) share->reclength);
    info->current_hash_ptr=0;			/* Can't use read_next */
    DBUG_RETURN(0);
  } /* heap_scan */
  