zero padding numbers

[tgate]

I notice that in Cocoa the NSNumberFormatter class has a method for  
setting a "pad" so that numbers like "12" can look like "0012" after  
formating.  This seems to be missing from the GNUstep version and I'm  
wondering if there is another way people tend to do this.   If I want  
to read a series of images uploaded form a camera the zero-pad is  
very helpful.

-todd