[libcxx] Fix the preexisting directory_iterator code for windows
The directory_iterator.cpp file did contain an incomplete,
non-working implementation for windows.
Change it to use the wchar version of the APIs.
Don't set the windows specific errors from GetLastError() as code
in the generic category; remap the errors to the std::errc values.
Error out cleanly on empty paths.
Invoke FindFirstFile on <directoryname>/* to actually list the
entries of the directory.
If the first entry retured by FindFirstFile is to be skipped (e.g.
being "." or ".."), call advance() (which calls FindNextFile and loops)
which doesn't return until a valid entry is found (or the end is
reached).
Differential Revision: https://reviews.llvm.org/D91140
GitOrigin-RevId: 156180727d6c347eda3ba749730707acb8a48093
diff --git a/src/filesystem/operations.cpp b/src/filesystem/operations.cpp
index 70b531e..4d585af 100644
--- a/src/filesystem/operations.cpp
+++ b/src/filesystem/operations.cpp
@@ -309,6 +309,73 @@
// POSIX HELPERS
+#if defined(_LIBCPP_WIN32API)
+namespace detail {
+
+errc __win_err_to_errc(int err) {
+ constexpr struct {
+ DWORD win;
+ errc errc;
+ } win_error_mapping[] = {
+ {ERROR_ACCESS_DENIED, errc::permission_denied},
+ {ERROR_ALREADY_EXISTS, errc::file_exists},
+ {ERROR_BAD_NETPATH, errc::no_such_file_or_directory},
+ {ERROR_BAD_UNIT, errc::no_such_device},
+ {ERROR_BROKEN_PIPE, errc::broken_pipe},
+ {ERROR_BUFFER_OVERFLOW, errc::filename_too_long},
+ {ERROR_BUSY, errc::device_or_resource_busy},
+ {ERROR_BUSY_DRIVE, errc::device_or_resource_busy},
+ {ERROR_CANNOT_MAKE, errc::permission_denied},
+ {ERROR_CANTOPEN, errc::io_error},
+ {ERROR_CANTREAD, errc::io_error},
+ {ERROR_CANTWRITE, errc::io_error},
+ {ERROR_CURRENT_DIRECTORY, errc::permission_denied},
+ {ERROR_DEV_NOT_EXIST, errc::no_such_device},
+ {ERROR_DEVICE_IN_USE, errc::device_or_resource_busy},
+ {ERROR_DIR_NOT_EMPTY, errc::directory_not_empty},
+ {ERROR_DIRECTORY, errc::invalid_argument},
+ {ERROR_DISK_FULL, errc::no_space_on_device},
+ {ERROR_FILE_EXISTS, errc::file_exists},
+ {ERROR_FILE_NOT_FOUND, errc::no_such_file_or_directory},
+ {ERROR_HANDLE_DISK_FULL, errc::no_space_on_device},
+ {ERROR_INVALID_ACCESS, errc::permission_denied},
+ {ERROR_INVALID_DRIVE, errc::no_such_device},
+ {ERROR_INVALID_FUNCTION, errc::function_not_supported},
+ {ERROR_INVALID_HANDLE, errc::invalid_argument},
+ {ERROR_INVALID_NAME, errc::no_such_file_or_directory},
+ {ERROR_INVALID_PARAMETER, errc::invalid_argument},
+ {ERROR_LOCK_VIOLATION, errc::no_lock_available},
+ {ERROR_LOCKED, errc::no_lock_available},
+ {ERROR_NEGATIVE_SEEK, errc::invalid_argument},
+ {ERROR_NOACCESS, errc::permission_denied},
+ {ERROR_NOT_ENOUGH_MEMORY, errc::not_enough_memory},
+ {ERROR_NOT_READY, errc::resource_unavailable_try_again},
+ {ERROR_NOT_SAME_DEVICE, errc::cross_device_link},
+ {ERROR_NOT_SUPPORTED, errc::not_supported},
+ {ERROR_OPEN_FAILED, errc::io_error},
+ {ERROR_OPEN_FILES, errc::device_or_resource_busy},
+ {ERROR_OPERATION_ABORTED, errc::operation_canceled},
+ {ERROR_OUTOFMEMORY, errc::not_enough_memory},
+ {ERROR_PATH_NOT_FOUND, errc::no_such_file_or_directory},
+ {ERROR_READ_FAULT, errc::io_error},
+ {ERROR_REPARSE_TAG_INVALID, errc::invalid_argument},
+ {ERROR_RETRY, errc::resource_unavailable_try_again},
+ {ERROR_SEEK, errc::io_error},
+ {ERROR_SHARING_VIOLATION, errc::permission_denied},
+ {ERROR_TOO_MANY_OPEN_FILES, errc::too_many_files_open},
+ {ERROR_WRITE_FAULT, errc::io_error},
+ {ERROR_WRITE_PROTECT, errc::permission_denied},
+ };
+
+ for (const auto &pair : win_error_mapping)
+ if (pair.win == static_cast<DWORD>(err))
+ return pair.errc;
+ return errc::invalid_argument;
+}
+
+} // namespace detail
+#endif
+
namespace detail {
namespace {