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Return WTF16LE encoded path from realpathW

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Michael Pfaff 2025-04-26 09:05:26 -04:00 • committed by Ryan Liptak
parent 328ae41468
commit f2227ae677
3 changed files with 48 additions and 38 deletions
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11
lib/std/fs.zig
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@ -643,10 +643,19 @@ pub fn selfExePath(out_buffer: []u8) SelfExePathError![]u8 {
// symlink, not the path that the symlink points to. We want the path
// that the symlink points to, though, so we need to get the realpath.
const pathname_w = try windows.wToPrefixedFileW(null, image_path_name);
return std.fs.cwd().realpathW(pathname_w.span(), out_buffer) catch |err| switch (err) {
var wide_buf: [windows.PATH_MAX_WIDE]u16 = undefined;
const wide_slice = std.fs.cwd().realpathW(pathname_w.span(), &wide_buf) catch |err| switch (err) {
error.InvalidWtf8 => unreachable,
else => |e| return e,
};
const len = std.unicode.calcWtf8Len(wide_slice);
if (len > out_buffer.len)
return error.NameTooLong;
const end_index = std.unicode.wtf16LeToWtf8(out_buffer, wide_slice);
return out_buffer[0..end_index];
},
else => @compileError("std.fs.selfExePath not supported for this target"),
}

34
lib/std/fs/Dir.zig
View file

@ -1370,7 +1370,16 @@ pub fn realpath(self: Dir, pathname: []const u8, out_buffer: []u8) RealPathError
}
if (native_os == .windows) {
const pathname_w = try windows.sliceToPrefixedFileW(self.fd, pathname);
return self.realpathW(pathname_w.span(), out_buffer);
var wide_buf: [windows.PATH_MAX_WIDE]u16 = undefined;
const wide_slice = try self.realpathW(pathname_w.span(), &wide_buf);
const len = std.unicode.calcWtf8Len(wide_slice);
if (len > out_buffer.len)
return error.NameTooLong;
const end_index = std.unicode.wtf16LeToWtf8(out_buffer, wide_slice);
return out_buffer[0..end_index];
}
const pathname_c = try posix.toPosixPath(pathname);
return self.realpathZ(&pathname_c, out_buffer);
@ -1381,7 +1390,16 @@ pub fn realpath(self: Dir, pathname: []const u8, out_buffer: []u8) RealPathError
pub fn realpathZ(self: Dir, pathname: [*:0]const u8, out_buffer: []u8) RealPathError![]u8 {
if (native_os == .windows) {
const pathname_w = try windows.cStrToPrefixedFileW(self.fd, pathname);
return self.realpathW(pathname_w.span(), out_buffer);
var wide_buf: [windows.PATH_MAX_WIDE]u16 = undefined;
const wide_slice = try self.realpathW(pathname_w.span(), &wide_buf);
const len = std.unicode.calcWtf8Len(wide_slice);
if (len > out_buffer.len)
return error.NameTooLong;
const end_index = std.unicode.wtf16LeToWtf8(out_buffer, wide_slice);
return out_buffer[0..end_index];
}
var flags: posix.O = .{};
@ -1411,9 +1429,9 @@ pub fn realpathZ(self: Dir, pathname: [*:0]const u8, out_buffer: []u8) RealPathE
}
/// Windows-only. Same as `Dir.realpath` except `pathname` is WTF16 LE encoded.
/// The result is encoded as [WTF-8](https://simonsapin.github.io/wtf-8/).
/// The result is encoded as WTF16 LE.
/// See also `Dir.realpath`, `realpathW`.
pub fn realpathW(self: Dir, pathname: []const u16, out_buffer: []u8) RealPathError![]u8 {
pub fn realpathW(self: Dir, pathname: []const u16, out_buffer: []u16) RealPathError![]u16 {
const w = windows;
const access_mask = w.GENERIC_READ | w.SYNCHRONIZE;
@ -1434,13 +1452,7 @@ pub fn realpathW(self: Dir, pathname: []const u16, out_buffer: []u8) RealPathErr
};
defer w.CloseHandle(h_file);
var wide_buf: [w.PATH_MAX_WIDE]u16 = undefined;
const wide_slice = try w.GetFinalPathNameByHandle(h_file, .{}, &wide_buf);
const len = std.unicode.calcWtf8Len(wide_slice);
if (len > out_buffer.len)
return error.NameTooLong;
const end_index = std.unicode.wtf16LeToWtf8(out_buffer, wide_slice);
return out_buffer[0..end_index];
return w.GetFinalPathNameByHandle(h_file, .{}, out_buffer);
}
pub const RealPathAllocError = RealPathError || Allocator.Error;

41
lib/std/posix.zig
View file

@ -5676,7 +5676,12 @@ pub const RealPathError = error{
pub fn realpath(pathname: []const u8, out_buffer: *[max_path_bytes]u8) RealPathError![]u8 {
if (native_os == .windows) {
const pathname_w = try windows.sliceToPrefixedFileW(null, pathname);
return realpathW(pathname_w.span(), out_buffer);
var wide_buf: [windows.PATH_MAX_WIDE]u16 = undefined;
const wide_slice = try realpathW(pathname_w.span(), &wide_buf);
const end_index = std.unicode.wtf16LeToWtf8(out_buffer, wide_slice);
return out_buffer[0..end_index];
} else if (native_os == .wasi and !builtin.link_libc) {
@compileError("WASI does not support os.realpath");
}
@ -5690,7 +5695,12 @@ pub fn realpath(pathname: []const u8, out_buffer: *[max_path_bytes]u8) RealPathE
pub fn realpathZ(pathname: [*:0]const u8, out_buffer: *[max_path_bytes]u8) RealPathError![]u8 {
if (native_os == .windows) {
const pathname_w = try windows.cStrToPrefixedFileW(null, pathname);
return realpathW(pathname_w.span(), out_buffer);
var wide_buf: [windows.PATH_MAX_WIDE]u16 = undefined;
const wide_slice = try realpathW(pathname_w.span(), &wide_buf);
const end_index = std.unicode.wtf16LeToWtf8(out_buffer, wide_slice);
return out_buffer[0..end_index];
} else if (native_os == .wasi and !builtin.link_libc) {
return realpath(mem.sliceTo(pathname, 0), out_buffer);
}
@ -5736,32 +5746,11 @@ pub fn realpathZ(pathname: [*:0]const u8, out_buffer: *[max_path_bytes]u8) RealP
/// Same as `realpath` except `pathname` is WTF16LE-encoded.
///
/// The result is encoded as [WTF-8](https://simonsapin.github.io/wtf-8/).
/// The result is encoded as WTF16LE.
///
/// Calling this function is usually a bug.
pub fn realpathW(pathname: []const u16, out_buffer: *[max_path_bytes]u8) RealPathError![]u8 {
const w = windows;
const dir = fs.cwd().fd;
const access_mask = w.GENERIC_READ | w.SYNCHRONIZE;
const share_access = w.FILE_SHARE_READ | w.FILE_SHARE_WRITE | w.FILE_SHARE_DELETE;
const creation = w.FILE_OPEN;
const h_file = blk: {
const res = w.OpenFile(pathname, .{
.dir = dir,
.access_mask = access_mask,
.share_access = share_access,
.creation = creation,
.filter = .any,
}) catch |err| switch (err) {
error.WouldBlock => unreachable,
else => |e| return e,
};
break :blk res;
};
defer w.CloseHandle(h_file);
return std.os.getFdPath(h_file, out_buffer);
pub fn realpathW(pathname: []const u16, out_buffer: *[max_path_bytes]u16) RealPathError![]u16 {
return fs.cwd().realpathW(pathname, out_buffer);
}
/// Spurious wakeups are possible and no precision of timing is guaranteed.