00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011
00012
00013
00014
00015
00016 #include "myisam_priv.h"
00017
00018 using namespace drizzled;
00019
00020
00021
00022
00023
00024
00025
00026
00027
00028 int mi_rnext_same(MI_INFO *info, unsigned char *buf)
00029 {
00030 int error;
00031 uint32_t inx,not_used[2];
00032 MI_KEYDEF *keyinfo;
00033
00034 if ((int) (inx=info->lastinx) < 0 || info->lastpos == HA_OFFSET_ERROR)
00035 return(errno=HA_ERR_WRONG_INDEX);
00036 keyinfo=info->s->keyinfo+inx;
00037 if (fast_mi_readinfo(info))
00038 return(errno);
00039
00040 switch (keyinfo->key_alg)
00041 {
00042 case HA_KEY_ALG_BTREE:
00043 default:
00044 if (!(info->update & HA_STATE_RNEXT_SAME))
00045 {
00046
00047 memcpy(info->lastkey2,info->lastkey,info->last_rkey_length);
00048 }
00049 for (;;)
00050 {
00051 if ((error=_mi_search_next(info,keyinfo,info->lastkey,
00052 info->lastkey_length,SEARCH_BIGGER,
00053 info->s->state.key_root[inx])))
00054 break;
00055 if (ha_key_cmp(keyinfo->seg, info->lastkey, info->lastkey2,
00056 info->last_rkey_length, SEARCH_FIND, not_used))
00057 {
00058 error=1;
00059 errno=HA_ERR_END_OF_FILE;
00060 info->lastpos= HA_OFFSET_ERROR;
00061 break;
00062 }
00063
00064 if (info->lastpos < info->state->data_file_length &&
00065 (!info->index_cond_func || mi_check_index_cond(info, inx, buf)))
00066 break;
00067 }
00068 }
00069
00070 info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);
00071 info->update|= HA_STATE_NEXT_FOUND | HA_STATE_RNEXT_SAME;
00072
00073 if (error)
00074 {
00075 if (errno == HA_ERR_KEY_NOT_FOUND)
00076 errno=HA_ERR_END_OF_FILE;
00077 }
00078 else if (!buf)
00079 {
00080 return(info->lastpos==HA_OFFSET_ERROR ? errno : 0);
00081 }
00082 else if (!(*info->read_record)(info,info->lastpos,buf))
00083 {
00084 info->update|= HA_STATE_AKTIV;
00085 return(0);
00086 }
00087 return(errno);
00088 }