working network server

cxx/comm_server_endpoint.h

@@ -4,6 +4,7 @@
 #include <array>
 #include <charconv>
 #include <cstdint>
+#include <filesystem>
 #include <ranges>
 #include <string_view>
 
@@ -286,6 +287,48 @@ public:
         return portView<std::string_view>();
     }
 
+    template <traits::mcc_output_char_range R, traits::mcc_input_char_range RR = std::string_view>
+    R path(RR&& root_path) const
+    {
+        if (_path.empty()) {
+            if constexpr (traits::mcc_output_char_range<R>) {
+                R res;
+                std::ranges::copy(std::forward<RR>(root_path), std::back_inserter(res));
+
+                return res;
+            } else {  // can't add root path!!!
+                return part<R>(PATH_PART);
+            }
+        }
+
+        auto N = std::ranges::distance(root_path.begin(), root_path.end());
+
+        if (N) {
+            R res;
+            std::filesystem::path pt(root_path.begin(), root_path.end());
+
+            if (isLocal() && _path[0] == '\0') {
+                std::ranges::copy(std::string_view(" "), std::back_inserter(res));
+                pt /= _path.substr(1);
+                std::ranges::copy(pt.string(), std::back_inserter(res));
+                *res.begin() = '\0';
+            } else {
+                pt /= _path;
+                std::ranges::copy(pt.string(), std::back_inserter(res));
+            }
+
+            return res;
+        } else {
+            return part<R>(PATH_PART);
+        }
+    }
+
+    template <traits::mcc_input_char_range RR = std::string_view>
+    std::string path(RR&& root_path) const
+    {
+        return path<std::string, RR>(std::forward<RR>(root_path));
+    }
+
     template <traits::mcc_view_or_output_char_range R>
     R path() const
     {