public static string GetDirectoryName(string path)
{
if (Common.IsRunningOnMono())
{
return(System.IO.Path.GetDirectoryName(path));
}
if (path == null)
{
throw new ArgumentNullException("path");
}
Path.CheckInvalidPathChars(path);
string basePath = null;
if (!IsPathRooted(path))
{
basePath = System.IO.Directory.GetCurrentDirectory();
}
path = Path.RemoveLongPathPrefix(Path.NormalizeLongPath(path));
int rootLength = GetRootLength(path);
if (path.Length <= rootLength)
{
return(null);
}
int length = path.Length;
do
{
} while (length > rootLength && path[--length] != System.IO.Path.DirectorySeparatorChar &&
path[length] != System.IO.Path.AltDirectorySeparatorChar);
if (basePath != null)
{
path = path.Substring(basePath.Length + 1);
length = length - basePath.Length - 1;
if (length < 0)
{
length = 0;
}
}
return(path.Substring(0, length));
}
// $$modif pb
public static int GetRootLength(string path)
{
if (Common.IsPathUnc(path))
{
return(GetUncRootLength(path));
}
// $$modif pb
//path = Path.GetFullPath(path);
Path.CheckInvalidPathChars(path);
int rootLength = 0;
int length = path.Length;
if (length >= 1 && IsDirectorySeparator(path[0]))
{
rootLength = 1;
if (length >= 2 && IsDirectorySeparator(path[1]))
{
rootLength = 2;
int num = 2;
while (rootLength >= length ||
((path[rootLength] == System.IO.Path.DirectorySeparatorChar ||
path[rootLength] == System.IO.Path.AltDirectorySeparatorChar) && --num <= 0))
{
++rootLength;
}
}
}
else if (length >= 2 && path[1] == System.IO.Path.VolumeSeparatorChar)
{
rootLength = 2;
if (length >= 3 && IsDirectorySeparator(path[2]))
{
++rootLength;
}
}
return(rootLength);
}
