Function ShortToLongPathName

src/common/isc_file.cpp:628–831

// http://www.geocities.com/SiliconValley/2060/articles/longpaths.html

static bool ShortToLongPathName(tstring& Path)
{
	// Special characters.
	const char sep = '\\';
	const char colon = ':';

	// Copy the short path into the work buffer and convert forward
	// slashes to backslashes.
	translate_slashes(Path);

	// We need a couple of markers for stepping through the path.
	size left = 0;
	size right = 0;
	bool found_root = false;

	// Parse the first bit of the path.
	// Probably has to change to use GetDriveType.
	if (Path.length() >= 2 && isDriveLetter(Path[0]) && colon == Path[1]) // Drive letter?
	{
		if (Path.length() == 2) // 'bare' drive letter
		{
			right = npos; // skip main block
		}
		else if (sep == Path[2]) // drive letter + backslash
		{
			// FindFirstFile doesn't like "X:\"
			if (Path.length() == 3)
			{
				right = npos; // skip main block
			}
			else
			{
				left = right = 3;
				found_root = true;
			}
		}
		else
		{
			return false; // parsing failure
		}
	}
	else if (Path.length() >= 1 && sep == Path[0])
	{
		if (Path.length() == 1) // 'bare' backslash
		{
			right = npos;  // skip main block
		}
		else
		{
			if (sep == Path[1]) // is it UNC?
			{
				// Find end of machine name
				right = Path.find_first_of(sep, 2);
				if (npos == right)
				{
					return false;
				}