Now I come to think of it, if you look here:

http://www.programmersheaven.com/zone5/cat.../32144.htm

radix_conversion() can be used without modification by casting the value parameter to a long int. radix_conversion() will still run reasonably quickly because it terminates when all the digits have been generated.

radix_conversion() could be fairly easily modified to call fast_int_divide() instead of fast_long_divide(). The most significant difference is that the divisor is passed in R2 rather than R3. If you change value to a int, that will change location of all the parameters which could be tricky, but can be done.

Enjoy.