static unsafe void Main(string[] args)
{
Console.WriteLine("Emulate opendir()");
//var buf = new byte[65536];
//var fd = LibC.open(toNullTerm(Encoding.UTF8.GetBytes("/tmp")), LibC.O_DIRECTORY|LibC.O_RDONLY);
//Console.WriteLine($"Open fd={fd} errno={LibC.errno}");
//LibC.fcntl(fd, LibC.F_SETFD, LibC.FD_CLOEXEC);
//Console.WriteLine($"Fcntl fd={fd} errno={LibC.errno}");
//var dh = Mono.Unix.Native.Syscall.opendir("/tmp");
//while (true)
//{
// var rd = Mono.Unix.Native.Syscall.readdir(dh);
// if (rd == null) break;
// Console.WriteLine($"{rd.d_name}");
//}
//fixed (byte* p = buf)
//{
// var count = LibC.read(fd, p, 65536);
// Console.WriteLine($"Read {(int) count}");
// dumpBytes(buf, (int) count);
//}
//var dh = RawDirs.opendir(toNullTerm(Encoding.UTF8.GetBytes("/tmp")));
//while (true)
//{
// var dir = RawDirs.readdir_wrap(dh);
// if (dir == null) break;
// var d = dir.Value;
// var name = Encoding.UTF8.GetString(d.d_name);
// Console.WriteLine($"{name}");
//}
//RawDirs.closedir(dh);
var mt = new StringTrie <string>();
mt.Add("/a/b/", "ab#");
mt.Add("/a/c/", "ac#");
mt.Add("/b/b/", "bb#");
var a = mt.FindPredecessor("/a/b/c");
Console.WriteLine($"/a/b/c {a.Value}");
//a = mt.FindPredecessor("/a/b");
//Console.WriteLine($"/a/b {a.Value}");
}