PTRDIFF
(void) fwrite(start, 1, PTRDIFF(fmt, start),
(void) fwrite(start, 1, PTRDIFF(fmt, start), stdout);
*len = PTRDIFF(store, save);
*len = PTRDIFF(store, save);
*len = PTRDIFF(store, save);
TEST_SMAX(PTRDIFF, __PTRDIFF_TYPE__);