[loader] Preserve nxlink argv markers

src/core/loader/homebrew_nxlink.h

@@ -0,0 +1,23 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <cstddef>
+#include <optional>
+#include <string>
+#include <string_view>
+
+namespace Loader::HomebrewNxlink {
+
+constexpr size_t ArgvMarkerSize = 16;
+constexpr std::string_view ArgvMarkerSuffix = "_NXLINK_";
+
+// This module handles only the libnx argv marker. Client stream handling should be an
+// explicit byte-sink API; the marker alone must not imply logging.
+bool IsArgvMarker(std::string_view token);
+std::optional<std::string> GetArgvMarker(std::string_view argv_string);
+std::optional<std::string> PrepareArgv(std::string& argv_string,
+                                       std::string_view inherited_marker);
+
+} // namespace Loader::HomebrewNxlink