riemann.fmi.uni-sofia.bg/programs/nlogin-0.3-pre/fmt_ulong.c


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unsigned int fmt_ulong(register char *s,register unsigned long u) /*EXTRACT_INCL*/ {
  register unsigned int len; register unsigned long q;
  len = 1; q = u;                        /* DJB */
  while (q > 9) { ++len; q /= 10; }
  if (s) {
    s += len;
    do { *--s = '0' + (u % 10); u /= 10; } while(u); /* handles u == 0 */
  }
  return len;
}