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  • Committer: Monty Taylor
  • Date: 2010-10-15 17:18:02 UTC
  • mto: (1859.1.2 build)
  • mto: This revision was merged to the branch mainline in revision 1860.
  • Revision ID: mordred@inaugust.com-20101015171802-qhk6zyfhrkvprr1n
Added support for registering regular sys_var instances via module::Context.

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plugin/myisam/mi_rprev.cc
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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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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */
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#include "myisamdef.h"
 
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#include "myisam_priv.h"
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        /*
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           Read previous row with the same key as previous read
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           based on the position of the last used key!
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        */
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int mi_rprev(MI_INFO *info, uchar *buf, int inx)
 
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int mi_rprev(MI_INFO *info, unsigned char *buf, int inx)
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{
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  int error,changed;
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  register uint flag;
 
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  register uint32_t flag;
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  MYISAM_SHARE *share=info->s;
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  if ((inx = _mi_check_index(info,inx)) < 0)
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    return(my_errno);
 
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    return(errno);
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  flag=SEARCH_SMALLER;                          /* Read previous */
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  if (info->lastpos == HA_OFFSET_ERROR && info->update & HA_STATE_NEXT_FOUND)
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    flag=0;                                     /* Read last */
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  if (fast_mi_readinfo(info))
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    return(my_errno);
 
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    return(errno);
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  changed=_mi_test_if_changed(info);
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  if (share->concurrent_insert)
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    rw_rdlock(&share->key_root_lock[inx]);
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  if (!flag)
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    error=_mi_search_last(info, share->keyinfo+inx,
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                          share->state.key_root[inx]);
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          break;
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      }
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    }
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    rw_unlock(&share->key_root_lock[inx]);
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  }
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  info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);
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  info->update|= HA_STATE_PREV_FOUND;
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  if (error)
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  {
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    if (my_errno == HA_ERR_KEY_NOT_FOUND)
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      my_errno=HA_ERR_END_OF_FILE;
 
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    if (errno == HA_ERR_KEY_NOT_FOUND)
 
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      errno=HA_ERR_END_OF_FILE;
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  }
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  else if (!buf)
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  {
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    return(info->lastpos==HA_OFFSET_ERROR ? my_errno : 0);
 
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    return(info->lastpos==HA_OFFSET_ERROR ? errno : 0);
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  }
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  else if (!(*info->read_record)(info,info->lastpos,buf))
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  {
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    info->update|= HA_STATE_AKTIV;              /* Record is read */
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    return(0);
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  }
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  return(my_errno);
 
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  return(errno);
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} /* mi_rprev */