- sprintf() can return negative value on error, so p += sprintf(p, blah)
is unsafe
- signed/unsigned mixup
- wrong assumption: sizeof(time_t) <= sizeof(int)
- need to init errno to 0 before strtoul()
then checking that against ULONG_MAX. Instead use a "unsigned long"
as the temporary variable. Then check against UINT32_MAX before
assigning back to the original variable.
