numarg
static long numarg(const char *, long, long);
blocksperfile = numarg("number of blocks per file",
ntrec = numarg("number of blocks per write",
cachesize = numarg("cachesize", 0, 0) * 1024 * 1024;
density = numarg("density", 10L, 327670L) / 10;
honorlevel = numarg("honor level", 0L, 10L);
tsize = numarg("tape size", 1L, 0L) * 12 * 10;