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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Buffers;
namespace System
{
internal static partial class Environment
{
internal static int CurrentNativeThreadId => unchecked((int)Interop.mincore.GetCurrentThreadId());
internal static long TickCount64 => (long)Interop.mincore.GetTickCount64();
public static string ExpandEnvironmentVariables(string name)
{
if (name == null)
throw new ArgumentNullException(nameof(name));
int currentSize = 128;
for (;;)
{
char[] buffer = ArrayPool<char>.Shared.Rent(currentSize);
int actualSize = Interop.Kernel32.ExpandEnvironmentStrings(name, buffer, buffer.Length);
if (actualSize <= buffer.Length)
{
string result = (actualSize != 0) ? new string(buffer, 0, actualSize) : null;
ArrayPool<char>.Shared.Return(buffer);
return result;
}
ArrayPool<char>.Shared.Return(buffer);
currentSize = actualSize;
}
}
}
}
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