Method concatPath

src/common/os/win32/path_utils.cpp:131–194

}

void PathUtils::concatPath(PathName& result,
		const PathName& first,
		const PathName& second)
{
	if (first.length() == 0)
	{
		result = second;
		return;
	}

	result = first;

	// First path used to be from trusted sources like getRootDirectory, etc.
	// Second path is mostly user-entered and must be carefully parsed to avoid hacking
	if (second.length() == 0)
	{
		return;
	}

	ensureSeparator(result);

	PathName::size_type cur_pos = 0;

	for (PathName::size_type pos = 0; cur_pos < second.length(); cur_pos = pos + 1)
	{
		static const char separators[] = "/\\";
		static const PathName::size_type separatorsLen =
			static_cast<PathName::size_type>(strlen(separators));

		pos = second.find_first_of(separators, cur_pos, separatorsLen);
		if (pos == PathName::npos) // simple name, simple handling
			pos = second.length();

		if (pos == cur_pos) // Empty piece, ignore
			continue;

		if (pos == cur_pos + curr_dir_link_len &&
			memcmp(second.c_str() + cur_pos, curr_dir_link, curr_dir_link_len) == 0) // Current dir, ignore
		{
			continue;
		}

		if (pos == cur_pos + up_dir_link_len &&
			memcmp(second.c_str() + cur_pos, up_dir_link, up_dir_link_len) == 0) // One dir up
		{
			if (result.length() < 2)
			{
				// We have nothing to cut off, ignore this piece (may be throw an error?..)
				continue;
			}

			const PathName::size_type up_dir = result.find_last_of(
				separators, result.length() - 2, separatorsLen);

			if (up_dir == PathName::npos)
				continue;

			result.erase(up_dir + 1);