Here is my C code in an Objective-C method
var addressBuffer : CChar(100)
that is the way to get a nice unicode character array in Swfit:
var charArray: Array<Character> = Array(count: 100, repeatedValue: "?")
if fills your array with 100 question marks, initially.
CChar, for instance:
var charArray: Array<CChar> = Array(count: 100, repeatedValue: 32) // 32 is the ascii space