fix newline error

BWLserver/guilog.cc

@@ -21,7 +21,7 @@ namespace bwl
     uint32_t bgcolor;          //背景颜色
     std::thread *cursor_flash; //光标刷新线程
 
-#define buffer_at(buffer, x, y) ((uint32_t *)buffer)[x + y * size[0]]
+#define buffer_at(buffer, x, y) ((uint32_t *)buffer)[(x) + (y)*size[0]]
 
     void initGUILog(uint32_t *buffer, uint64_t width, uint64_t height, uint32_t __bgcolor)
     {
@@ -36,7 +36,7 @@ namespace bwl
         cursor_move = true;
         cursor_flash = new std::thread(cursorFlasher); //开启光标刷新线程
         bwl::log("init succeeded");
-        putString("!#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~");
+        putString("!#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~\nHello,World!");
     }
 
     void clear()