Truncate is missing from std.stdio.File, will this do the trick?

[spikespaz via Digitalmars-d]

I needed a truncate function on the `std.stdio.File` object, so I 
made this function. Does it look okay? Are there any 
cross-platform improvements you can think of that should be added?

import std.stdio: File;

void truncate(File file, long offset) {
    version (Windows) {
        import core.sys.windows.windows: SetEndOfFile;

        file.seek(offset);
        SetEndOfFile(file.windowsHandle());
    }

    version (Posix) {
        import core.sys.posix.unistd: ftruncate;

        ftruncate(file.fileno(), offset);
    }
}