git subrepo clone https://github.com/Atmosphere-NX/Atmosphere-libs libraries

subrepo:
  subdir:   "libraries"
  merged:   "07af583b"
upstream:
  origin:   "https://github.com/Atmosphere-NX/Atmosphere-libs"
  branch:   "master"
  commit:   "07af583b"
git-subrepo:
  version:  "0.4.0"
  origin:   "https://github.com/ingydotnet/git-subrepo"
  commit:   "5d6aba9"

libraries/libstratosphere/include/stratosphere/fs/fs_path_tool.hpp

@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2018-2019 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+#include "fs_common.hpp"
+#include "../fssrv/fssrv_sf_path.hpp"
+
+namespace ams::fs {
+
+    namespace StringTraits {
+
+        constexpr inline char DirectorySeparator = '/';
+        constexpr inline char DriveSeparator     = ':';
+        constexpr inline char Dot                = '.';
+        constexpr inline char NullTerminator     = '\x00';
+
+    }
+
+    class PathTool {
+        public:
+            static constexpr const char RootPath[] = "/";
+        public:
+            static constexpr inline bool IsSeparator(char c) {
+                return c == StringTraits::DirectorySeparator;
+            }
+
+            static constexpr inline bool IsNullTerminator(char c) {
+                return c == StringTraits::NullTerminator;
+            }
+
+            static constexpr inline bool IsDot(char c) {
+                return c == StringTraits::Dot;
+            }
+
+            static constexpr inline bool IsWindowsDriveCharacter(char c) {
+                return ('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z');
+            }
+
+            static constexpr inline bool IsDriveSeparator(char c) {
+                return c == StringTraits::DriveSeparator;
+            }
+
+            static constexpr inline bool IsWindowsAbsolutePath(const char *p) {
+                return IsWindowsDriveCharacter(p[0]) && IsDriveSeparator(p[1]);
+            }
+
+            static constexpr inline bool IsCurrentDirectory(const char *p) {
+                return IsDot(p[0]) && (IsSeparator(p[1]) || IsNullTerminator(p[1]));
+            }
+
+            static constexpr inline bool IsParentDirectory(const char *p) {
+                return IsDot(p[0]) && IsDot(p[1]) && (IsSeparator(p[2]) || IsNullTerminator(p[2]));
+            }
+
+            static Result Normalize(char *out, size_t *out_len, const char *src, size_t max_out_size, bool unc_preserved = false);
+            static Result IsNormalized(bool *out, const char *path);
+
+            static bool IsSubPath(const char *lhs, const char *rhs);
+    };
+
+}