STRTBLINCR
#define allocsize(size) roundup2((size) + 1, STRTBLINCR)
static struct strhdr strtblhdr[allocsize(NAME_MAX) / STRTBLINCR];
np = strtblhdr[len / STRTBLINCR].next;
strtblhdr[len / STRTBLINCR].next = np->next;
tp = &strtblhdr[strlen(name) / STRTBLINCR];