Function pad_at

src/od.c:518–525

If there are FIELDS fields, return the total padding up to the start of field I, where I < FIELDS. PAD is the total padding for all fields. The result equals (PAD * I) / FIELDS, except it does not suffer from internal overflow. */

   all fields.  The result equals (PAD * I) / FIELDS, except it does
   not suffer from internal overflow.  */
static idx_t
pad_at (idx_t fields, idx_t i, idx_t pad)
{
  /* This implementation assumes that (FIELDS - 1)^2 does not overflow
     intmax_t, an assumption checked by pad_at_overflow.  */
  intmax_t m = pad % fields;
  return pad / fields * i + m * i / fields;
}
static bool
pad_at_overflow (idx_t fields)
{