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00016 #include "myisam_priv.h"
00017
00018 using namespace drizzled;
00019
00020
00021
00022
00023
00024
00025
00026
00027 int mi_rnext(MI_INFO *info, unsigned char *buf, int inx)
00028 {
00029 int error,changed;
00030 uint32_t flag;
00031 int res= 0;
00032
00033 if ((inx = _mi_check_index(info,inx)) < 0)
00034 return(errno);
00035 flag=SEARCH_BIGGER;
00036 if (info->lastpos == HA_OFFSET_ERROR && info->update & HA_STATE_PREV_FOUND)
00037 flag=0;
00038
00039 if (fast_mi_readinfo(info))
00040 return(errno);
00041 changed=_mi_test_if_changed(info);
00042 if (!flag)
00043 {
00044 switch(info->s->keyinfo[inx].key_alg){
00045 case HA_KEY_ALG_BTREE:
00046 default:
00047 error=_mi_search_first(info,info->s->keyinfo+inx,
00048 info->s->state.key_root[inx]);
00049 break;
00050 }
00051 }
00052 else
00053 {
00054 switch (info->s->keyinfo[inx].key_alg) {
00055 case HA_KEY_ALG_BTREE:
00056 default:
00057 if (!changed)
00058 error= _mi_search_next(info,info->s->keyinfo+inx,info->lastkey,
00059 info->lastkey_length,flag,
00060 info->s->state.key_root[inx]);
00061 else
00062 error= _mi_search(info,info->s->keyinfo+inx,info->lastkey,
00063 USE_WHOLE_KEY,flag, info->s->state.key_root[inx]);
00064 }
00065 }
00066
00067 if (!error)
00068 {
00069 while ((info->s->concurrent_insert &&
00070 info->lastpos >= info->state->data_file_length) ||
00071 (info->index_cond_func &&
00072 !(res= mi_check_index_cond(info, inx, buf))))
00073 {
00074
00075 if ((error=_mi_search_next(info,info->s->keyinfo+inx,
00076 info->lastkey,
00077 info->lastkey_length,
00078 SEARCH_BIGGER,
00079 info->s->state.key_root[inx])))
00080 break;
00081 }
00082 if (!error && res == 2)
00083 {
00084 info->lastpos= HA_OFFSET_ERROR;
00085 return(errno= HA_ERR_END_OF_FILE);
00086 }
00087 }
00088
00089
00090 info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);
00091 info->update|= HA_STATE_NEXT_FOUND;
00092
00093 if (error)
00094 {
00095 if (errno == HA_ERR_KEY_NOT_FOUND)
00096 errno=HA_ERR_END_OF_FILE;
00097 }
00098 else if (!buf)
00099 {
00100 return(info->lastpos==HA_OFFSET_ERROR ? errno : 0);
00101 }
00102 else if (!(*info->read_record)(info,info->lastpos,buf))
00103 {
00104 info->update|= HA_STATE_AKTIV;
00105 return(0);
00106 }
00107 return(errno);
00108 }