fix(libkernel): fail unlink, remove, rename and open of a file named with a trailing slash with ENOTDIR on Windows

core/libs/prx/libc/include/FilesystemError.hpp

@@ -33,6 +33,15 @@ inline bool HasNonDirectoryPrefix_nid_no_patch(const std::filesystem::path& nati
     return false;
 }
 
+inline bool NamesNonDirectoryWithSlash_nid_no_patch(const std::filesystem::path& native) {
+    if (native.has_filename()) return false;
+    auto named = native;
+    while (!named.has_filename() && named.has_relative_path()) named = named.parent_path();
+    std::error_code error;
+    const auto status = std::filesystem::status(named, error);
+    return std::filesystem::exists(status) && !std::filesystem::is_directory(status);
+}
+
 inline int NotFoundError_nid_no_patch(const std::filesystem::path& native) {
     return HasNonDirectoryPrefix_nid_no_patch(native) ? 20 : 2;
 }

core/libs/prx/libc/src/Filesystem.cpp

@@ -85,6 +85,7 @@ extern "C" int APS5_VABI remove_nid_postfix(const char* path) {
             errno = 22;
             return -1;
         }
+        if (NamesNonDirectoryWithSlash_nid_no_patch(resolved)) { errno = 20; return -1; }
         std::error_code error;
 #ifdef _WIN32
         const DWORD attributes = GetFileAttributesW(resolved.c_str());

core/libs/prx/libc/src/General.cpp

@@ -178,13 +178,11 @@ std::optional<std::filesystem::path> ResolveAlias(const std::string& guestPath,
             const auto result = std::filesystem::path(host).make_preferred();
             return module ? PathOrRelinkedModule(result) : result;
         }
-#ifndef _WIN32
         if (guestPath.back() == '/') {
             auto result = ResolveHostPath(host, SplitNames(std::string_view(relative).substr(prefix.size() + 1)));
             result /= "";
             return module ? PathOrRelinkedModule(result) : result;
         }
-#endif
         return ResolveHostPath(host, SplitNames(std::string_view(relative).substr(prefix.size() + 1)), module).make_preferred();
     }
     return std::nullopt;

core/libs/prx/libc/src/Rename.cpp

@@ -115,6 +115,7 @@ extern "C" int RenameGuestPath_nid_no_patch(const char* from, const char* to) {
             return -1;
         }
         const auto destination = ResolvePath_nid_no_patch(to);
+        if (NamesNonDirectoryWithSlash_nid_no_patch(source) || (std::filesystem::exists(source) && NamesNonDirectoryWithSlash_nid_no_patch(destination))) { errno = 20; return -1; }
         int error = RenamePath_nid_no_patch(source, destination);
         if (error == 2) {
             std::error_code status;

core/libs/prx/libkernel/File/src/Open.cpp

@@ -270,6 +270,7 @@ int APS5_VABI sceKernelOpen(const char* path, int flags, std::uint16_t mode) {
         APS5_LOG_ERR("open failed path=%s resolveError=%d result=0x%08X", path != nullptr ? path : "<null>", error, static_cast<unsigned>(result));
         return result;
     }
+    if (NamesNonDirectoryWithSlash_nid_no_patch(native)) return SceErrorFromErrno(ENOTDIR);
     const int result = OpenNative(native, flags, mode);
     if (result < 0) {
         const auto resolved = native.u8string();
@@ -416,6 +417,7 @@ int APS5_VABI sceKernelUnlink(const char* path) {
     std::filesystem::path native;
     if (const int error = ResolvePathError_nid_no_patch(path, native)) return SceKernelError(error);
     constexpr int GuestEperm = 1;
+    if (NamesNonDirectoryWithSlash_nid_no_patch(native)) return SceErrorFromErrno(20);
     std::error_code error;
     if (std::filesystem::is_directory(std::filesystem::symlink_status(native, error))) return SceErrorFromErrno(GuestEperm);
     if (NativeUnlink(native) != 0) {

core/libs/tests/GuestFilesystem.cpp

@@ -238,7 +238,6 @@ static void TestParentTraversal() {
     checkInvalid("/parent-test-mount/present.txt/..", 20);
     FileStat status{};
     Require(sceKernelStat("/parent-test-mount/existing/../present.txt", &status) == 0 && status.st_size == 9);
-#ifndef _WIN32
     for (const char* name : {"slash-unlink", "slash-remove", "slash-rename", "slash-open", "slash-kernel"}) std::ofstream(root / name) << "kept";
     Require(unlink_nid_postfix("/parent-test-mount/slash-unlink/") == -1 && *__error_nid_postfix() == 20);
     Require(remove_nid_postfix("/parent-test-mount/slash-remove/") == -1 && *__error_nid_postfix() == 20);
@@ -250,7 +249,6 @@ static void TestParentTraversal() {
     Require(sceKernelStat("/parent-test-mount/Existing/", &status) == 0 && (status.st_mode & 0170000) == 0040000);
     Require(mkdir_nid_postfix("/parent-test-mount/slash-directory/", 0755) == 0 && std::filesystem::is_directory(root / "slash-directory"));
     Require(rmdir_nid_postfix("/parent-test-mount/slash-directory/") == 0 && !std::filesystem::exists(root / "slash-directory"));
-#endif
     RemovePathAlias_nid_no_patch("parent-test-mount");
     std::error_code linkError;
     std::filesystem::create_directory_symlink("Existing", root / "directory-link", linkError);