STRTBLINCR
#define allocsize(size) (((size) + 1 + STRTBLINCR - 1) & ~(STRTBLINCR - 1))
static struct strhdr strtblhdr[allocsize(NAME_MAX) / STRTBLINCR];
tp = &strtblhdr[len / STRTBLINCR];
tp = &strtblhdr[strlen(name) / STRTBLINCR];