MAXCHK
for (; n < MAXCHK; n++)
char a[MAXCHK], b[MAXCHK], r[MAXCHK];
for (i = 0; i < MAXCHK; i++) {
(void)memset(r, ~0, MAXCHK);
if (memcmp(b, r, MAXCHK) != 0) {
dump("expect:", b, MAXCHK);
dump("result:", r, MAXCHK);