[td-225]refactor codes.

src/client/src/tscUtil.c

@@ -4466,8 +4466,13 @@ static int32_t doAddTableName(char* nextStr, char** str, SArray* pNameArray, SSq
     strncpy(tablename, *str, TSDB_TABLE_FNAME_LEN);
     len = (int32_t) strlen(tablename);
   } else {
-    memcpy(tablename, *str, nextStr - (*str));
     len = (int32_t)(nextStr - (*str));
+    if (len >= TSDB_TABLE_NAME_LEN) {
+      sprintf(pCmd->payload, "table name too long");
+      return TSDB_CODE_TSC_INVALID_OPERATION;
+    }
+
+    memcpy(tablename, *str, nextStr - (*str));
     tablename[len] = '\0';
   }
 
@@ -4479,9 +4484,8 @@ static int32_t doAddTableName(char* nextStr, char** str, SArray* pNameArray, SSq
 
   // Check if the table name available or not
   if (tscValidateName(&sToken) != TSDB_CODE_SUCCESS) {
-    code = TSDB_CODE_TSC_INVALID_TABLE_ID_LENGTH;
     sprintf(pCmd->payload, "table name is invalid");
-    return code;
+    return TSDB_CODE_TSC_INVALID_TABLE_ID_LENGTH;
   }
 
   SName name = {0};
@@ -4541,14 +4545,18 @@ int tscTransferTableNameList(SSqlObj *pSql, const char *pNameList, int32_t lengt
     }
   }
 
-  if (taosArrayGetSize(pNameArray) > TSDB_MULTI_TABLEMETA_MAX_NUM) {
+  size_t len = taosArrayGetSize(pNameArray);
+  if (len == 1) {
+    return TSDB_CODE_SUCCESS;
+  }
+
+  if (len > TSDB_MULTI_TABLEMETA_MAX_NUM) {
     code = TSDB_CODE_TSC_INVALID_TABLE_ID_LENGTH;
     sprintf(pCmd->payload, "tables over the max number");
     return code;
   }
 
   taosArraySort(pNameArray, nameComparFn);
-  size_t len = taosArrayGetSize(pNameArray);
 
   int32_t pos = 0;
   for(int32_t i = 1; i < len; ++i) {