internal static string WindowsDriveAdjustment(string path)
{
// three special cases to consider when a drive is specified
if (path.Length < 2)
{
if (path.Length == 1 && (path[0] == '\\' || path[0] == '/'))
{
return(Path.GetPathRoot(Directory.GetCurrentDirectory()));
}
return(path);
}
if ((path [1] != ':') || !Char.IsLetter(path [0]))
{
return(path);
}
string current = Directory.InsecureGetCurrentDirectory();
// first, only the drive is specified
if (path.Length == 2)
{
// then if the current directory is on the same drive
if (current [0] == path [0])
{
path = current; // we return it
}
else
{
path = GetFullPathName(path); // we have to use the GetFullPathName Windows API
}
}
else if ((path [2] != Path.DirectorySeparatorChar) && (path [2] != Path.AltDirectorySeparatorChar))
{
// second, the drive + a directory is specified *without* a separator between them (e.g. C:dir).
// If the current directory is on the specified drive...
if (current [0] == path [0])
{
// then specified directory is appended to the current drive directory
path = Path.Combine(current, path.Substring(2, path.Length - 2));
}
else
{
// we have to use the GetFullPathName Windows API
path = GetFullPathName(path);
}
}
return(path);
}
internal static string WindowsDriveAdjustment(string path)
{
// two special cases to consider when a drive is specified
if (path.Length < 2)
{
return(path);
}
if ((path [1] != ':') || !Char.IsLetter(path [0]))
{
return(path);
}
string current = Directory.InsecureGetCurrentDirectory();
// first, only the drive is specified
if (path.Length == 2)
{
// then if the current directory is on the same drive
if (current [0] == path [0])
{
path = current; // we return it
}
else
{
path += '\\';
}
}
else if ((path [2] != Path.DirectorySeparatorChar) && (path [2] != Path.AltDirectorySeparatorChar))
{
// second, the drive + a directory is specified *without* a separator between them (e.g. C:dir).
// If the current directory is on the specified drive...
if (current [0] == path [0])
{
// then specified directory is appended to the current drive directory
path = Path.Combine(current, path.Substring(2, path.Length - 2));
}
else
{
// if not, then just pretend there was a separator (Path.Combine won't work in this case)
path = String.Concat(path.Substring(0, 2), DirectorySeparatorStr, path.Substring(2, path.Length - 2));
}
}
return(path);
}
// insecure - do not call directly
internal static string InsecureGetFullPath(string path)
{
if (path == null)
{
throw new ArgumentNullException("path");
}
if (path.Trim().Length == 0)
{
string msg = Locale.GetText("The specified path is not of a legal form (empty).");
throw new ArgumentException(msg);
}
#if !MOBILE
// adjust for drives, i.e. a special case for windows
if (Environment.IsRunningOnWindows)
{
path = WindowsDriveAdjustment(path);
}
#endif
// if the supplied path ends with a separator...
char end = path [path.Length - 1];
var canonicalize = true;
if (path.Length >= 2 &&
IsDirectorySeparator(path [0]) &&
IsDirectorySeparator(path [1]))
{
if (path.Length == 2 || path.IndexOf(path [0], 2) < 0)
{
throw new ArgumentException("UNC paths should be of the form \\\\server\\share.");
}
if (path [0] != DirectorySeparatorChar)
{
path = path.Replace(AltDirectorySeparatorChar, DirectorySeparatorChar);
}
}
else
{
if (!IsPathRooted(path))
{
// avoid calling expensive CanonicalizePath when possible
if (!Environment.IsRunningOnWindows)
{
var start = 0;
while ((start = path.IndexOf('.', start)) != -1)
{
if (++start == path.Length || path [start] == DirectorySeparatorChar || path [start] == AltDirectorySeparatorChar)
{
break;
}
}
canonicalize = start > 0;
}
var cwd = Directory.InsecureGetCurrentDirectory();
if (cwd [cwd.Length - 1] == DirectorySeparatorChar)
{
path = cwd + path;
}
else
{
path = cwd + DirectorySeparatorChar + path;
}
}
else if (DirectorySeparatorChar == '\\' &&
path.Length >= 2 &&
IsDirectorySeparator(path [0]) &&
!IsDirectorySeparator(path [1])) // like `\abc\def'
{
string current = Directory.InsecureGetCurrentDirectory();
if (current [1] == VolumeSeparatorChar)
{
path = current.Substring(0, 2) + path;
}
else
{
path = current.Substring(0, current.IndexOf('\\', current.IndexOfUnchecked("\\\\", 0, current.Length) + 1));
}
}
}
if (canonicalize)
{
path = CanonicalizePath(path);
}
// if the original ended with a [Alt]DirectorySeparatorChar then ensure the full path also ends with one
if (IsDirectorySeparator(end) && (path [path.Length - 1] != DirectorySeparatorChar))
{
path += DirectorySeparatorChar;
}
return(path);
}