static int CountValues(ReadOnlySpan <char> span)
{
int count = 0;
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
count += 2;
}
var e = new PathVariableFragmentEnumerator(span);
while (e.MoveNext())
{
count++;
}
return(count);
}
/// <summary>
/// <para>Split the value of the PATH environment variable to an array of strings.</para>
/// <para>(Windows-specific) The 32-bit Windows system directory (system32) and the Windows directory are prepended.</para>
/// </summary>
/// <param name="envStr">The value of the PATH environment variable.</param>
/// <returns>Array of directories in the search path.</returns>
public static string[] ResolveSearchPath(string?envStr)
{
var fragments = new string[CountValues(envStr)];
int index = 0;
if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
fragments[0] = Environment.GetFolderPath(Environment.SpecialFolder.System, Environment.SpecialFolderOption.DoNotVerify);
fragments[1] = Environment.GetFolderPath(Environment.SpecialFolder.Windows, Environment.SpecialFolderOption.DoNotVerify);
index = 2;
}
var e = new PathVariableFragmentEnumerator(envStr);
while (e.MoveNext())
{
fragments[index++] = new string(e.Current);
}
Debug.Assert(index == fragments.Length);
return(fragments);