Get list of MS-DOS devices and their mappings using QueryDosDevice function

QueryDosDevice.cs

namespace Vurdalakov
{
    using System;
    using System.Collections.Generic;
    using System.Runtime.InteropServices;
    using System.Text;

    class Program
    {
        [DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
        private static extern Int32 QueryDosDeviceW(String lpDeviceName, Char[] lpTargetPath, Int32 ucchMax);

        static void Main(string[] args)
        {
            var buffer = new Char[65536];

            // get list of all device names

            var size = QueryDosDeviceW(null, buffer, buffer.Length - 1);
            if (0 == size)
            {
                Console.WriteLine($"QueryDosDeviceW failed with error {Marshal.GetLastWin32Error()}");
                return;
            }

            var deviceNames = ParseNullTerminatedString(buffer, 0, size);

            Console.WriteLine($"--- {deviceNames.Count} devices:");

            // get device mappings

            foreach (var deviceName in deviceNames)
            {
                Console.Write(deviceName);

                size = QueryDosDeviceW(deviceName, buffer, buffer.Length - 1);
                if (0 == size)
                {
                    Console.WriteLine($"QueryDosDeviceW failed with error {Marshal.GetLastWin32Error()}");
                }
                else
                {
                    var deviceMapings = ParseNullTerminatedString(buffer, 0, size);

                    if (deviceMapings.Count > 0)
                    {
                        Console.Write($"\t{deviceMapings[0]}");
                    }

                    Console.WriteLine();
                }
            }
        }

        private static List<String> ParseNullTerminatedString(Char[] buffer, Int32 startIndex, Int32 length)
        {
            var strings = new List<String>();

            var stringBuilder = new StringBuilder();

            for (var i = startIndex; i < startIndex + length; i++)
            {
                if ('\0' == buffer[i])
                {
                    if (0 == stringBuilder.Length)
                    {
                        break;
                    }

                    strings.Add(stringBuilder.ToString());
                    stringBuilder.Clear();
                }
                else
                {
                    stringBuilder.Append(buffer[i]);
                }
            }

            return strings;
        }
    }
}