Swift glGetProgramInfoLog - ios

Question

Does anyone know how to implement this in swift? The entire function call is
glGetProgramInfoLog(
<#program: GLuint#>,
<#bufsize: GLsizei#>,
<#length: UnsafeMutablePointer<GLsizei>#>,
<#infolog: UnsafeMutablePointer<GLchar>#>)
I understand passing the pointers but not the buffer sizes. Android doesn't even have these parameters at all.

Answer 1

For anyone looking for an answer you can use following code :
Where program is let program = glCreateProgram()
Swift 2
var message = [CChar](count: 256, repeatedValue: CChar(0))
var length = GLsizei(0)
glGetProgramInfoLog(program, 256, &length, &message)
print(String(UTF8String: message))
Swift 3
var message = [CChar](repeating: CChar(0), count: 256)
var length = GLsizei(0)
glGetProgramInfoLog(program, 256, &length, &message)
var s = String.init(utf8String: message)!
if(s.characters.count > 0){print("Shader compile log: \(s)")} //only prints if log isnt empty

Answer 2

Try this:
var message = [CChar](count: 256, repeatedValue: CChar(0))
var length = GLsizei(0)
var log = Array<GLchar>(count: Int(length ), repeatedValue: 0)
log.withUnsafeBufferPointer { logPointer -> Void in
glGetShaderInfoLog(yourProgram, length, &length, UnsafeMutablePointer(logPointer.baseAddress))
NSLog("Shader compile log: \n%#", String(UTF8String: log)!)
}