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Start drafting out os.readlink on Windows

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This commit is contained in:
Jakub Konka 2020-07-12 23:03:09 +02:00
parent 9225763f8b
commit cc83d92b0b
2 changed files with 57 additions and 2 deletions
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32
lib/std/os.zig
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@ -2355,6 +2355,8 @@ pub const ReadLinkError = error{
FileNotFound,
SystemResources,
NotDir,
/// Windows-only.
UnsupportedSymlinkType,
} || UnexpectedError;
/// Read value of a symbolic link.
@ -2373,9 +2375,35 @@ pub fn readlink(file_path: []const u8, out_buffer: []u8) ReadLinkError![]u8 {
pub const readlinkC = @compileError("deprecated: renamed to readlinkZ");
/// Windows-only. Same as `readlink` expecte `file_path` is null-terminated, WTF16 encoded.
/// Seel also `readlinkZ`.
/// Windows-only. Same as `readlink` except `file_path` is null-terminated, WTF16 encoded.
/// See also `readlinkZ`.
pub fn readlinkW(file_path: [*:0]const u16, out_buffer: []u8) ReadLinkError![]u8 {
const handle = windows.OpenFile(file_path, .{
.access_mask = 0,
.creation = c.FILE_OPEN_REPARSE_POINT | c.FILE_LIST_DIRECTORY,
.io_mode = 0,
}) catch |err| {
switch (err) {
error.IsDir => unreachable,
error.NoDevice => return error.FileNotFound,
error.SharingViolation => return error.AccessDenied,
error.PipeBusy => unreachable,
error.PathAlreadyExists => unreachable,
error.WouldBlock => unreachable,
else => return err,
}
};
var reparse_buf: [windows.MAXIMUM_REPARSE_DATA_BUFFER_SIZE]u8 = undefined;
_ = try windows.DeviceIoControl(handle, windows.FSCTL_GET_REPARSE_POINT, null, reparse_buf[0..], null);
const reparse_struct = @bitCast(windows._REPARSE_DATA_BUFFER, reparse_buf[0..@sizeOf(windows._REPARSE_DATA_BUFFER)]);
switch (reparse_struct.ReparseTag) {
windows.IO_REPARSE_TAG_SYMLINK => {},
windows.IO_REPARSE_TAG_MOUNT_POINT => {},
else => |value| {
std.debug.print("unsupported symlink type: {}", value);
return error.UnsupportedSymlinkType;
},
}
@compileError("TODO implement readlink for Windows");
}

27
lib/std/os/windows/bits.zig
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@ -1542,3 +1542,30 @@ pub const POSVERSIONINFOW = *OSVERSIONINFOW;
pub const LPOSVERSIONINFOW = *OSVERSIONINFOW;
pub const RTL_OSVERSIONINFOW = OSVERSIONINFOW;
pub const PRTL_OSVERSIONINFOW = *RTL_OSVERSIONINFOW;
pub const _REPARSE_DATA_BUFFER = extern struct {
ReparseTag: ULONG, ReparseDataLength: USHORT, Reserved: USHORT, u: extern union {
SymbolicLinkReparseBuffer: extern struct {
SubstituteNameOffset: USHORT,
SubstituteNameLength: USHORT,
PrintNameOffset: USHORT,
PrintNameLength: USHORT,
Flags: ULONG,
PathBuffer: [1]WCHAR,
},
MountPointReparseBuffer: extern struct {
SubstituteNameOffset: USHORT,
SubstituteNameLength: USHORT,
PrintNameOffset: USHORT,
PrintNameLength: USHORT,
PathBuffer: [1]WCHAR,
},
GenericReparseBuffer: extern struct {
DataBuffer: [1]UCHAR,
},
}
};
pub const MAXIMUM_REPARSE_DATA_BUFFER_SIZE: usize = 16 * 1024;
pub const FSCTL_GET_REPARSE_POINT: DWORD = 0x900a8;
pub const IO_REPARSE_TAG_SYMLINK: ULONG = 0xa000000c;
pub const IO_REPARSE_TAG_MOUNT_POINT: ULONG = 0xa0000003;