major_to_index
for (dp = major_names[major_to_index(offset)]; dp; dp = dp->next)
index = major_to_index(major);
int index = major_to_index(major);
for (n = &major_names[major_to_index(major)]; *n; n = &(*n)->next) {
i = major_to_index(major);
int i = major_to_index(major);
for (cd = chrdevs[major_to_index(offset)]; cd; cd = cd->next) {
for (cd = chrdevs[major_to_index(i)]; cd; cd = cd->next)