51    if (isOpen) { // file is already open  in OpenForRead()
69          isOpen = 0;  in OpenForRead()
72          isOpen = 0;  in OpenForRead()
86                isOpen = 1;  in OpenForRead()
91    return isOpen;  in OpenForRead()
97    if ((isOpen) && (openForWrite))  in OpenForWrite()
113       isOpen = 1;  in OpenForWrite()
116       isOpen = 0;  in OpenForWrite()
119    return isOpen;  in OpenForWrite()
125    if (isOpen)  in Close()
128    isOpen = 0;  in Close()
142    if (!isOpen) {  in GetBlockSize()
146    if (isOpen) {  in GetBlockSize()
188    if (!isOpen)  in GetNumHeads()
206    if (!isOpen)  in GetNumSecsPerTrack()
224    if (!isOpen) {  in DiskSync()
228    if (isOpen) {  in DiskSync()
277    if (!isOpen) {  in Seek()
281    if (isOpen) {  in Seek()
300    if (!isOpen) {  in Read()
304    if (isOpen) {  in Read()
343    if ((!isOpen) || (!openForWrite)) {  in Write()
347    if (isOpen) {  in Write()
399    if (!isOpen) {  in DiskSize()
403    if (isOpen) {  in DiskSize()