myrg_rnext_same.c

/* 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 */

#include "myrg_def.h"

int myrg_rnext_same(MYRG_INFO *info, byte *buf)
{
  uint err;
  MI_INFO *mi;

  if (!info->current_table)
    return (HA_ERR_KEY_NOT_FOUND);

  err=mi_rnext_same(info->current_table->table,buf);
  if (err == HA_ERR_END_OF_FILE)
  {
    queue_remove(&(info->by_key),0);
    if (!info->by_key.elements)
      return HA_ERR_END_OF_FILE;

    mi=(info->current_table=(MYRG_TABLE *)queue_top(&(info->by_key)))->table;
    mi->once_flags|= RRND_PRESERVE_LASTINX;
    return mi_rrnd(mi,buf,mi->lastpos);
  }
  return err;
}