Compute phi in base x

Hi from /sci/...  There was just a short thread about the digits of pi.  I personally think that phi (golden ratio) is far more interesting and was hoping one of you gentlemen might have some code to compute arbitrary digits of phi in any base chosen by the user.  Hopefully it isn't offensive to ask that it be in C.

Since it's purely random, there's going to be some sort of image in there, eventually.  Just curious to see what the first "significant" finding is.

>>12
It's 44x100 = 4400 characters.  It uses the following characters:
!"#$%()*+,-./12348:;<=>?@ABCDEGHIQSUVWXYZ^_`acdeghiklmnopqsuvwz{|}~
That's 68 characters.  So, you'd need to look at something on the order of 68⁴⁴⁰⁰ digits of phi to find your image.