/* $Id: hmnul.cpp,v 1.3 2001年12月05日 18:06:01 sandervl Exp $ */
/*
 * Project Odin Software License can be found in LICENSE.TXT
 *
 * Win32 NUL device access class
 *
 * 2001 Patrick Haller <patrick.haller@innotek.de>
 *
 */
#include <os2win.h>
#include <string.h>
#include <handlemanager.h>
#include "handlenames.h"
#include <heapstring.h>
#include <winioctl.h>
#include "hmdevice.h"
#include "hmnul.h"
#include "oslibdos.h"
#define DBG_LOCALLOG DBG_hmnul
#include "dbglocal.h"
HMDeviceNulClass::HMDeviceNulClass(LPCSTR lpDeviceName) : HMDeviceHandler(lpDeviceName)
{
 dprintf(("HMDeviceNulClass::HMDevParPortClass(%s)\n",
 lpDeviceName));
 
 HMDeviceRegister("NUL", this);
 
 // add symbolic links to the "real name" of the device
 HandleNamesAddSymbolicLink("NUL:", "NUL");
 HandleNamesAddSymbolicLink("\\\\.\\NUL", "NUL");
}
/*****************************************************************************
 * Name : HMDeviceNulClass::FindDevice
 * Purpose : Checks if lpDeviceName belongs to this device class
 * Parameters: LPCSTR lpClassDevName
 * LPCSTR lpDeviceName
 * int namelength
 * Variables :
 * Result : checks if name is COMx or COMx: (x=1..8)
 * Remark :
 * Status :
 *
 * Author : SvL
 *****************************************************************************/
BOOL HMDeviceNulClass::FindDevice(LPCSTR lpClassDevName, LPCSTR lpDeviceName, int namelength)
{
 // == "NUL"
 if(lstrcmpiA(lpDeviceName, lpClassDevName) != 0) 
 return FALSE;
 return TRUE;
}
DWORD HMDeviceNulClass::CreateFile(LPCSTR lpFileName,
 PHMHANDLEDATA pHMHandleData,
 PVOID lpSecurityAttributes,
 PHMHANDLEDATA pHMHandleDataTemplate)
{
 dprintf(("HMDeviceNulClass::CreateFile(%s,%08xh,%08xh,%08xh)\n",
 lpFileName,
 pHMHandleData,
 lpSecurityAttributes,
 pHMHandleDataTemplate));
 
 // we don't actually open a handle to OS/2's NUL device,
 // we just swallow any I/O
 pHMHandleData->hHMHandle = 0xdeadface;
 SetLastError(ERROR_SUCCESS);
 return NO_ERROR;
}
 /* this is a handler method for calls to CloseHandle() */
BOOL HMDeviceNulClass::CloseHandle(PHMHANDLEDATA pHMHandleData)
{
 dprintf(("HMDeviceNulClass: close request(%08xh)\n",
 pHMHandleData));
 
 return TRUE;
}
/*****************************************************************************
 * Name : BOOL HMDeviceNulClass::WriteFile
 * Purpose : write data to handle / device
 * Parameters: PHMHANDLEDATA pHMHandleData,
 * LPCVOID lpBuffer,
 * DWORD nNumberOfBytesToWrite,
 * LPDWORD lpNumberOfBytesWritten,
 * LPOVERLAPPED lpOverlapped
 * Variables :
 * Result : Boolean
 * Remark :
 * Status :
 *
 * Author : Patrick Haller [2001年11月29日]
 *****************************************************************************/
BOOL HMDeviceNulClass::WriteFile(PHMHANDLEDATA pHMHandleData,
 LPCVOID lpBuffer,
 DWORD nNumberOfBytesToWrite,
 LPDWORD lpNumberOfBytesWritten,
 LPOVERLAPPED lpOverlapped,
 LPOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine)
{
 dprintf(("KERNEL32:HMDeviceNulClass::WriteFile %s(%08x,%08x,%08x,%08x,%08x)",
 lpHMDeviceName,
 pHMHandleData->hHMHandle,
 lpBuffer,
 nNumberOfBytesToWrite,
 lpNumberOfBytesWritten,
 lpOverlapped));
 BOOL ret;
 ULONG ulBytesWritten;
 if((pHMHandleData->dwFlags & FILE_FLAG_OVERLAPPED) && !lpOverlapped) {
 dprintf(("FILE_FLAG_OVERLAPPED flag set, but lpOverlapped NULL!!"));
 SetLastError(ERROR_INVALID_PARAMETER);
 return FALSE;
 }
 if(!(pHMHandleData->dwFlags & FILE_FLAG_OVERLAPPED) && lpOverlapped) {
 dprintf(("Warning: lpOverlapped != NULL & !FILE_FLAG_OVERLAPPED; sync operation"));
 }
 if(lpCompletionRoutine) {
 dprintf(("!WARNING!: lpCompletionRoutine not supported -> fall back to sync IO"));
 }
 
 // this is real NUL I/O
 ret = NO_ERROR;
 ulBytesWritten = nNumberOfBytesToWrite;
 if(lpNumberOfBytesWritten) {
 *lpNumberOfBytesWritten = (ret) ? ulBytesWritten : 0;
 }
 if(ret == FALSE) {
 dprintf(("ERROR: WriteFile failed with rc %d", GetLastError()));
 }
 return ret;
}
/*****************************************************************************
 * Name : BOOL HMDeviceNulClass::ReadFile
 * Purpose : read data from handle / device
 * Parameters: PHMHANDLEDATA pHMHandleData,
 * LPCVOID lpBuffer,
 * DWORD nNumberOfBytesToRead,
 * LPDWORD lpNumberOfBytesRead,
 * LPOVERLAPPED lpOverlapped
 * Variables :
 * Result : Boolean
 * Remark :
 * Status :
 *
 * Author : SvL
 *****************************************************************************/
BOOL HMDeviceNulClass::ReadFile(PHMHANDLEDATA pHMHandleData,
 LPCVOID lpBuffer,
 DWORD nNumberOfBytesToRead,
 LPDWORD lpNumberOfBytesRead,
 LPOVERLAPPED lpOverlapped,
 LPOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine)
{
 dprintf(("KERNEL32:HMDeviceNulClass::ReadFile %s(%08x,%08x,%08x,%08x,%08x)",
 lpHMDeviceName,
 pHMHandleData->hHMHandle,
 lpBuffer,
 nNumberOfBytesToRead,
 lpNumberOfBytesRead,
 lpOverlapped));
 BOOL ret;
 ULONG ulBytesRead;
 if((pHMHandleData->dwFlags & FILE_FLAG_OVERLAPPED) && !lpOverlapped) {
 dprintf(("FILE_FLAG_OVERLAPPED flag set, but lpOverlapped NULL!!"));
 SetLastError(ERROR_INVALID_PARAMETER);
 return FALSE;
 }
 if(!(pHMHandleData->dwFlags & FILE_FLAG_OVERLAPPED) && lpOverlapped) {
 dprintf(("Warning: lpOverlapped != NULL & !FILE_FLAG_OVERLAPPED; sync operation"));
 }
 if(lpCompletionRoutine) {
 dprintf(("!WARNING!: lpCompletionRoutine not supported -> fall back to sync IO"));
 }
 
 // this is real NUL I/O
 ret = NO_ERROR;
 ulBytesRead = nNumberOfBytesToRead;
 if(lpNumberOfBytesRead) {
 *lpNumberOfBytesRead = (ret) ? ulBytesRead : 0;
 }
 if(ret == FALSE) {
 dprintf(("ERROR: ReadFile failed with rc %d", GetLastError()));
 }
 return ret;
}
BOOL HMDeviceNulClass::DeviceIoControl(PHMHANDLEDATA pHMHandleData, 
 DWORD dwIoControlCode,
 LPVOID lpInBuffer, 
 DWORD nInBufferSize,
 LPVOID lpOutBuffer, 
 DWORD nOutBufferSize,
 LPDWORD lpBytesReturned, 
 LPOVERLAPPED lpOverlapped)
{
 dprintf(("HMDeviceNulClass::DeviceIoControl: unimplemented dwIoControlCode=%08lx\n", dwIoControlCode));
 SetLastError(ERROR_CALL_NOT_IMPLEMENTED);
 return FALSE;
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