Update Nemirtingas overlay to latest.

overlay_experimental/System/System_internals.cpp

@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) Nemirtingas
+ * This file is part of System.
+ *
+ * System is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * System is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with System; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#include "System_internals.h"
+
+#if defined(SYSTEM_OS_WINDOWS)
+#define WIN32_LEAN_AND_MEAN
+#define VC_EXTRALEAN
+#define NOMINMAX
+#include <Windows.h>
+
+namespace System {
+
+}
+
+#elif defined(SYSTEM_OS_LINUX)
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+namespace System {
+SYSTEM_HIDE_API(std::string, SYSTEM_CALL_DEFAULT) ExpandSymlink(std::string file_path)
+{
+    struct stat file_stat;
+    std::string link_target;
+    ssize_t name_len = 128;
+    while(lstat(file_path.c_str(), &file_stat) >= 0 && S_ISLNK(file_stat.st_mode) == 1)
+    {
+        do
+        {
+            name_len *= 2;
+            link_target.resize(name_len);
+            name_len = readlink(file_path.c_str(), &link_target[0], link_target.length());
+        } while (name_len == link_target.length());
+        link_target.resize(name_len);
+        file_path = std::move(link_target);
+    }
+
+    return file_path;
+}
+
+}
+
+#endif