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Move Windows rename implementation from std.posix to windows.RenameFile

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This also unifies the rename implementations, since previously `posix.renameW` used `MoveFileEx` while `posix.renameatW` used `NtOpenFile`/`NtSetInformationFile`. This, in turn, allows the `MoveFileEx` bindings to be deleted as `posix.renameW` was the only usage.
This commit is contained in:
Ryan Liptak 2025-11-23 20:02:16 -08:00
parent 17ecc77fc4
commit bf25816067
3 changed files with 129 additions and 124 deletions
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136
lib/std/os/windows.zig
View File

@ -1084,21 +1084,135 @@ pub fn DeleteFile(sub_path_w: []const u16, options: DeleteFileOptions) DeleteFil
}
}
pub const MoveFileError = error{ FileNotFound, AccessDenied, Unexpected };
pub const RenameError = error{
IsDir,
NotDir,
FileNotFound,
NoDevice,
AccessDenied,
PipeBusy,
PathAlreadyExists,
Unexpected,
NameTooLong,
NetworkNotFound,
AntivirusInterference,
BadPathName,
RenameAcrossMountPoints,
} || UnexpectedError;
pub fn MoveFileEx(old_path: []const u8, new_path: []const u8, flags: DWORD) (MoveFileError || Wtf8ToPrefixedFileWError)!void {
const old_path_w = try sliceToPrefixedFileW(null, old_path);
const new_path_w = try sliceToPrefixedFileW(null, new_path);
return MoveFileExW(old_path_w.span().ptr, new_path_w.span().ptr, flags);
pub fn RenameFile(
/// May only be `null` if `old_path_w` is a fully-qualified absolute path.
old_dir_fd: ?HANDLE,
old_path_w: []const u16,
/// May only be `null` if `new_path_w` is a fully-qualified absolute path,
/// or if the file is not being moved to a different directory.
new_dir_fd: ?HANDLE,
new_path_w: []const u16,
replace_if_exists: bool,
) RenameError!void {
const src_fd = OpenFile(old_path_w, .{
.dir = old_dir_fd,
.access_mask = SYNCHRONIZE | GENERIC_WRITE | DELETE,
.creation = FILE_OPEN,
.filter = .any, // This function is supposed to rename both files and directories.
.follow_symlinks = false,
}) catch |err| switch (err) {
error.WouldBlock => unreachable, // Not possible without `.share_access_nonblocking = true`.
else => |e| return e,
};
defer CloseHandle(src_fd);
var rc: NTSTATUS = undefined;
// FileRenameInformationEx has varying levels of support:
// - FILE_RENAME_INFORMATION_EX requires >= win10_rs1
// (INVALID_INFO_CLASS is returned if not supported)
// - Requires the NTFS filesystem
// (on filesystems like FAT32, INVALID_PARAMETER is returned)
// - FILE_RENAME_POSIX_SEMANTICS requires >= win10_rs1
// - FILE_RENAME_IGNORE_READONLY_ATTRIBUTE requires >= win10_rs5
// (NOT_SUPPORTED is returned if a flag is unsupported)
//
// The strategy here is just to try using FileRenameInformationEx and fall back to
// FileRenameInformation if the return value lets us know that some aspect of it is not supported.
const need_fallback = need_fallback: {
const struct_buf_len = @sizeOf(FILE_RENAME_INFORMATION_EX) + (PATH_MAX_WIDE * 2);
var rename_info_buf: [struct_buf_len]u8 align(@alignOf(FILE_RENAME_INFORMATION_EX)) = undefined;
const struct_len = @sizeOf(FILE_RENAME_INFORMATION_EX) + new_path_w.len * 2;
if (struct_len > struct_buf_len) return error.NameTooLong;
const rename_info: *FILE_RENAME_INFORMATION_EX = @ptrCast(&rename_info_buf);
var io_status_block: IO_STATUS_BLOCK = undefined;
var flags: ULONG = FILE_RENAME_POSIX_SEMANTICS | FILE_RENAME_IGNORE_READONLY_ATTRIBUTE;
if (replace_if_exists) flags |= FILE_RENAME_REPLACE_IF_EXISTS;
rename_info.* = .{
.Flags = flags,
.RootDirectory = if (std.fs.path.isAbsoluteWindowsWtf16(new_path_w)) null else new_dir_fd,
.FileNameLength = @intCast(new_path_w.len * 2), // already checked error.NameTooLong
.FileName = undefined,
};
@memcpy((&rename_info.FileName).ptr, new_path_w);
rc = ntdll.NtSetInformationFile(
src_fd,
&io_status_block,
rename_info,
@intCast(struct_len), // already checked for error.NameTooLong
.FileRenameInformationEx,
);
switch (rc) {
.SUCCESS => return,
// The filesystem does not support FileDispositionInformationEx
.INVALID_PARAMETER,
// The operating system does not support FileDispositionInformationEx
.INVALID_INFO_CLASS,
// The operating system does not support one of the flags
.NOT_SUPPORTED,
=> break :need_fallback true,
// For all other statuses, fall down to the switch below to handle them.
else => break :need_fallback false,
}
};
if (need_fallback) {
const struct_buf_len = @sizeOf(FILE_RENAME_INFORMATION) + (PATH_MAX_WIDE * 2);
var rename_info_buf: [struct_buf_len]u8 align(@alignOf(FILE_RENAME_INFORMATION)) = undefined;
const struct_len = @sizeOf(FILE_RENAME_INFORMATION) + new_path_w.len * 2;
if (struct_len > struct_buf_len) return error.NameTooLong;
const rename_info: *FILE_RENAME_INFORMATION = @ptrCast(&rename_info_buf);
var io_status_block: IO_STATUS_BLOCK = undefined;
rename_info.* = .{
.Flags = @intFromBool(replace_if_exists),
.RootDirectory = if (std.fs.path.isAbsoluteWindowsWtf16(new_path_w)) null else new_dir_fd,
.FileNameLength = @intCast(new_path_w.len * 2), // already checked error.NameTooLong
.FileName = undefined,
};
@memcpy((&rename_info.FileName).ptr, new_path_w);
rc = ntdll.NtSetInformationFile(
src_fd,
&io_status_block,
rename_info,
@intCast(struct_len), // already checked for error.NameTooLong
.FileRenameInformation,
);
}
pub fn MoveFileExW(old_path: [*:0]const u16, new_path: [*:0]const u16, flags: DWORD) MoveFileError!void {
if (kernel32.MoveFileExW(old_path, new_path, flags) == 0) {
switch (GetLastError()) {
.FILE_NOT_FOUND => return error.FileNotFound,
switch (rc) {
.SUCCESS => {},
.INVALID_HANDLE => unreachable,
.INVALID_PARAMETER => unreachable,
.OBJECT_PATH_SYNTAX_BAD => unreachable,
.ACCESS_DENIED => return error.AccessDenied,
else => |err| return unexpectedError(err),
}
.OBJECT_NAME_NOT_FOUND => return error.FileNotFound,
.OBJECT_PATH_NOT_FOUND => return error.FileNotFound,
.NOT_SAME_DEVICE => return error.RenameAcrossMountPoints,
.OBJECT_NAME_COLLISION => return error.PathAlreadyExists,
.DIRECTORY_NOT_EMPTY => return error.PathAlreadyExists,
.FILE_IS_A_DIRECTORY => return error.IsDir,
.NOT_A_DIRECTORY => return error.NotDir,
else => return unexpectedStatus(rc),
}
}

6
lib/std/os/windows/kernel32.zig
View File

@ -91,12 +91,6 @@ pub extern "kernel32" fn GetStdHandle(
nStdHandle: DWORD,
) callconv(.winapi) ?HANDLE;
pub extern "kernel32" fn MoveFileExW(
lpExistingFileName: LPCWSTR,
lpNewFileName: LPCWSTR,
dwFlags: DWORD,
) callconv(.winapi) BOOL;
// TODO: Wrapper around NtSetInformationFile + `FILE_POSITION_INFORMATION`.
// `FILE_STANDARD_INFORMATION` is also used if dwMoveMethod is `FILE_END`
pub extern "kernel32" fn SetFilePointerEx(

109
lib/std/posix.zig
View File

@ -2470,8 +2470,8 @@ pub fn renameZ(old_path: [*:0]const u8, new_path: [*:0]const u8) RenameError!voi
/// Same as `rename` except the parameters are null-terminated and WTF16LE encoded.
/// Assumes target is Windows.
pub fn renameW(old_path: [*:0]const u16, new_path: [*:0]const u16) RenameError!void {
const flags = windows.MOVEFILE_REPLACE_EXISTING | windows.MOVEFILE_WRITE_THROUGH;
return windows.MoveFileExW(old_path, new_path, flags);
const cwd_handle = std.fs.cwd().fd;
return windows.RenameFile(cwd_handle, mem.span(old_path), cwd_handle, mem.span(new_path), true);
}
/// Change the name or location of a file based on an open directory handle.
@ -2588,110 +2588,7 @@ pub fn renameatW(
new_path_w: []const u16,
ReplaceIfExists: windows.BOOLEAN,
) RenameError!void {
const src_fd = windows.OpenFile(old_path_w, .{
.dir = old_dir_fd,
.access_mask = windows.SYNCHRONIZE | windows.GENERIC_WRITE | windows.DELETE,
.creation = windows.FILE_OPEN,
.filter = .any, // This function is supposed to rename both files and directories.
.follow_symlinks = false,
}) catch |err| switch (err) {
error.WouldBlock => unreachable, // Not possible without `.share_access_nonblocking = true`.
else => |e| return e,
};
defer windows.CloseHandle(src_fd);
var rc: windows.NTSTATUS = undefined;
// FileRenameInformationEx has varying levels of support:
// - FILE_RENAME_INFORMATION_EX requires >= win10_rs1
// (INVALID_INFO_CLASS is returned if not supported)
// - Requires the NTFS filesystem
// (on filesystems like FAT32, INVALID_PARAMETER is returned)
// - FILE_RENAME_POSIX_SEMANTICS requires >= win10_rs1
// - FILE_RENAME_IGNORE_READONLY_ATTRIBUTE requires >= win10_rs5
// (NOT_SUPPORTED is returned if a flag is unsupported)
//
// The strategy here is just to try using FileRenameInformationEx and fall back to
// FileRenameInformation if the return value lets us know that some aspect of it is not supported.
const need_fallback = need_fallback: {
const struct_buf_len = @sizeOf(windows.FILE_RENAME_INFORMATION_EX) + (max_path_bytes - 1);
var rename_info_buf: [struct_buf_len]u8 align(@alignOf(windows.FILE_RENAME_INFORMATION_EX)) = undefined;
const struct_len = @sizeOf(windows.FILE_RENAME_INFORMATION_EX) - 1 + new_path_w.len * 2;
if (struct_len > struct_buf_len) return error.NameTooLong;
const rename_info: *windows.FILE_RENAME_INFORMATION_EX = @ptrCast(&rename_info_buf);
var io_status_block: windows.IO_STATUS_BLOCK = undefined;
var flags: windows.ULONG = windows.FILE_RENAME_POSIX_SEMANTICS | windows.FILE_RENAME_IGNORE_READONLY_ATTRIBUTE;
if (ReplaceIfExists == windows.TRUE) flags |= windows.FILE_RENAME_REPLACE_IF_EXISTS;
rename_info.* = .{
.Flags = flags,
.RootDirectory = if (fs.path.isAbsoluteWindowsWtf16(new_path_w)) null else new_dir_fd,
.FileNameLength = @intCast(new_path_w.len * 2), // already checked error.NameTooLong
.FileName = undefined,
};
@memcpy((&rename_info.FileName).ptr, new_path_w);
rc = windows.ntdll.NtSetInformationFile(
src_fd,
&io_status_block,
rename_info,
@intCast(struct_len), // already checked for error.NameTooLong
.FileRenameInformationEx,
);
switch (rc) {
.SUCCESS => return,
// The filesystem does not support FileDispositionInformationEx
.INVALID_PARAMETER,
// The operating system does not support FileDispositionInformationEx
.INVALID_INFO_CLASS,
// The operating system does not support one of the flags
.NOT_SUPPORTED,
=> break :need_fallback true,
// For all other statuses, fall down to the switch below to handle them.
else => break :need_fallback false,
}
};
if (need_fallback) {
const struct_buf_len = @sizeOf(windows.FILE_RENAME_INFORMATION) + (max_path_bytes - 1);
var rename_info_buf: [struct_buf_len]u8 align(@alignOf(windows.FILE_RENAME_INFORMATION)) = undefined;
const struct_len = @sizeOf(windows.FILE_RENAME_INFORMATION) - 1 + new_path_w.len * 2;
if (struct_len > struct_buf_len) return error.NameTooLong;
const rename_info: *windows.FILE_RENAME_INFORMATION = @ptrCast(&rename_info_buf);
var io_status_block: windows.IO_STATUS_BLOCK = undefined;
rename_info.* = .{
.Flags = ReplaceIfExists,
.RootDirectory = if (fs.path.isAbsoluteWindowsWtf16(new_path_w)) null else new_dir_fd,
.FileNameLength = @intCast(new_path_w.len * 2), // already checked error.NameTooLong
.FileName = undefined,
};
@memcpy((&rename_info.FileName).ptr, new_path_w);
rc = windows.ntdll.NtSetInformationFile(
src_fd,
&io_status_block,
rename_info,
@intCast(struct_len), // already checked for error.NameTooLong
.FileRenameInformation,
);
}
switch (rc) {
.SUCCESS => {},
.INVALID_HANDLE => unreachable,
.INVALID_PARAMETER => unreachable,
.OBJECT_PATH_SYNTAX_BAD => unreachable,
.ACCESS_DENIED => return error.AccessDenied,
.OBJECT_NAME_NOT_FOUND => return error.FileNotFound,
.OBJECT_PATH_NOT_FOUND => return error.FileNotFound,
.NOT_SAME_DEVICE => return error.RenameAcrossMountPoints,
.OBJECT_NAME_COLLISION => return error.PathAlreadyExists,
.DIRECTORY_NOT_EMPTY => return error.PathAlreadyExists,
.FILE_IS_A_DIRECTORY => return error.IsDir,
.NOT_A_DIRECTORY => return error.NotDir,
else => return windows.unexpectedStatus(rc),
}
return windows.RenameFile(old_dir_fd, old_path_w, new_dir_fd, new_path_w, ReplaceIfExists != 0);
}
/// On Windows, `sub_dir_path` should be encoded as [WTF-8](https://wtf-8.codeberg.page/).