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Попробуйте следующее:

func asciiCStringToSwiftString(cString:UnsafePointer<UInt8>, maxLength:Int) -> String
{
    var swiftString = String()  // The Swift String to be Returned is Intialized to an Empty String
    var workingCharacter:UnicodeScalar = UnicodeScalar(cString[0])
    var count:Int = 0           // An Index Into the C String Array Starting With the First Character

    while cString[count] != 0             // While We Haven't reached the End of the String
    {
        workingCharacter = UnicodeScalar(cString[count]) // Convert the ASCII Character to a Unicode Scalar
        swiftString.append(workingCharacter)             // Append the Unicode Scalar Version of the ASCII Character
        count++                                          // Increment the Index to Look at the Next ASCII Character

        if count > maxLength                            // Set a Limit In Case the C string was Not NULL Terminated
        {
            if printDebugLogs == true
            {
                swiftString="Reached String Length Limit in Converting ASCII C String To Swift String"
            }
            return swiftString
        }
    }

    return swiftString                     // Return the Swift String
}