pnstr
static void pnstr( char* s, int c );
pnstr( mpfps->signature, 4 );
pnstr( cth->signature, 4 );
pnstr( cth->oem_id, 8 );
pnstr( cth->product_id, 12 );
printf( "\t " ); pnstr( entry->bus_type, 6 ); printf( "\n" );