1 files changed, 42 insertions, 0 deletions
diff --git a/gcc/rust/util/rust-dir-owner.cc b/gcc/rust/util/rust-dir-owner.cc
new file mode 100644
index 0000000..24bbe7b
--- /dev/null
+++ b/gcc/rust/util/rust-dir-owner.cc
@@ -0,0 +1,42 @@
+// Copyright (C) 2023 Free Software Foundation, Inc.
+
+// This file is part of GCC.
+
+// GCC is free software; you can redistribute it and/or modify it under
+// the terms of the GNU General Public License as published by the Free
+// Software Foundation; either version 3, or (at your option) any later
+// version.
+
+// GCC 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 General Public License
+// for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with GCC; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// Handles non-mod-rs and mod-rs file differentiation
+
+#include "rust-system.h"
+#include "rust-dir-owner.h"
+
+namespace Rust {
+
+// extracts the owned subdirectory name from a file name
+bool
+get_file_subdir (const std::string &filename, std::string &subdir)
+{
+  // directory owning filenames
+  if (filename == "mod.rs" || filename == "lib.rs" || filename == "main.rs")
+    return false;
+
+  // files not ending in ".rs" are directory owners
+  if (filename.size () < 3 || filename.compare (filename.size () - 3, 3, ".rs"))
+    return false;
+
+  subdir = filename.substr (0, filename.size () - 3);
+  return true;
+}
+
+} // namespace Rust