increment_overflow32
static int increment_overflow32(int_fast32_t * number, int delta);
return increment_overflow32(tensptr, tensdelta);
if (increment_overflow32(&y, TM_YEAR_BASE))
if (increment_overflow32(&y, -1))
if (increment_overflow32(&y, 1))
if (increment_overflow32(&y, 1))
if (increment_overflow32(&y, -TM_YEAR_BASE))