Use %ju and an (uintmax_t) cast to print size_t values. Use %jd and an (intmax_t) cast to print off_t values. Use off_t variables to hold the difference between two off_t values. Don't bother with unsigned char where char will do nicely.
Use %ju and an (uintmax_t) cast to print size_t values. Use %jd and an (intmax_t) cast to print off_t values. Use off_t variables to hold the difference between two off_t values. Don't bother with unsigned char where char will do nicely.