#include "scan.h"unsigned int scan_ulong(s,u) register char *s; register unsigned long *u;{  register unsigned int pos; register unsigned long result;  register unsigned long c;  pos = 0; result = 0;  while ((c = (unsigned long) (unsigned char) (s[pos] - '0')) < 10)    { result = result * 10 + c; ++pos; }  *u = result; return pos;}