添加了求与请求距离的函数

添加了表示整个轨道长度的全局变量

src/bus.c

@@ -82,4 +82,30 @@ int JudgeOnStation()
     {
         return BUS_FAlSE;
     }
+}
+
+int GetQueryDistance(bus_query_t *query, int orientation)
+{
+    rail_node_t *target_node = query->node;
+    rail_node_t *now_node = the_bus->rail_node_pos;
+    int distance = 0;
+
+    if(orientation == BUS_CLOCK_WISE)
+    {
+        while (now_node != target_node)
+        {
+            distance += now_node->next_node_distance;
+            now_node = now_node->next_node;
+        }
+    }
+    else if(orientation == BUS_COUNTER_CLOCK_WISE)
+    {
+        while (now_node != target_node)
+        {
+            distance += now_node->last_node_distance;
+            now_node = now_node->last_node;
+        }
+    }
+
+    return distance;
 }

src/bus_io.c

@@ -151,6 +151,7 @@ rail_node_t *ReadConfigFile()
         chosen_strategy = BUS_FCFS;
     }
 
+    all_distance = distance * total_station;
     rail_node_t *head = CreateRails(distance, total_station);
     return head;
 }

src/rail.c

@@ -2,6 +2,7 @@
 
 rail_node_t *rails = NULL;
 int bus_time = 0;
+int all_distance = 0;
 
 rail_node_t *CreateRails(int length, int node_num)
 {