reactos/modules/rosapps/drivers/green/green.c

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/*
* PROJECT: ReactOS VT100 emulator
* LICENSE: GPL - See COPYING in the top level directory
* FILE: drivers/base/green/green.c
* PURPOSE: Driver entry point
* PROGRAMMERS: Copyright 2005-2006 Herv<EFBFBD> Poussineau (hpoussin@reactos.org)
*/
#include "green.h"
#define NDEBUG
#include <debug.h>
VOID NTAPI
DriverUnload(IN PDRIVER_OBJECT DriverObject)
{
// nothing to do here yet
}
/*
* Standard DriverEntry method.
*/
NTSTATUS NTAPI
DriverEntry(
IN PDRIVER_OBJECT DriverObject,
IN PUNICODE_STRING RegistryPath)
{
PGREEN_DRIVER_EXTENSION DriverExtension;
ULONG i;
NTSTATUS Status;
Status = IoAllocateDriverObjectExtension(
DriverObject,
DriverObject,
sizeof(GREEN_DRIVER_EXTENSION),
(PVOID*)&DriverExtension);
if (!NT_SUCCESS(Status))
{
DPRINT("IoAllocateDriverObjectExtension() failed with status 0x%08lx\n", Status);
return Status;
}
RtlZeroMemory(DriverExtension, sizeof(GREEN_DRIVER_EXTENSION));
Status = GreenDuplicateUnicodeString(
0,
RegistryPath,
&DriverExtension->RegistryPath);
if (!NT_SUCCESS(Status))
{
DPRINT("GreenDuplicateUnicodeString() failed with status 0x%08lx\n", Status);
return Status;
}
Status = ReadRegistryEntries(RegistryPath, DriverExtension);
if (!NT_SUCCESS(Status))
{
DPRINT("ReadRegistryEntries() failed with status 0x%08lx\n", Status);
return Status;
}
DriverObject->DriverUnload = DriverUnload;
DriverObject->DriverExtension->AddDevice = GreenAddDevice;
for (i = 0; i <= IRP_MJ_MAXIMUM_FUNCTION; i++)
DriverObject->MajorFunction[i] = GreenDispatch;
return STATUS_SUCCESS;
}
NTSTATUS
GreenDuplicateUnicodeString(
IN ULONG Flags,
IN PCUNICODE_STRING SourceString,
OUT PUNICODE_STRING DestinationString)
{
if (SourceString == NULL || DestinationString == NULL
|| SourceString->Length > SourceString->MaximumLength
|| (SourceString->Length == 0 && SourceString->MaximumLength > 0 && SourceString->Buffer == NULL)
|| Flags == RTL_DUPLICATE_UNICODE_STRING_ALLOCATE_NULL_STRING || Flags >= 4)
{
return STATUS_INVALID_PARAMETER;
}
if ((SourceString->Length == 0)
&& (Flags != (RTL_DUPLICATE_UNICODE_STRING_NULL_TERMINATE |
RTL_DUPLICATE_UNICODE_STRING_ALLOCATE_NULL_STRING)))
{
DestinationString->Length = 0;
DestinationString->MaximumLength = 0;
DestinationString->Buffer = NULL;
}
else
{
USHORT DestMaxLength = SourceString->Length;
if (Flags & RTL_DUPLICATE_UNICODE_STRING_NULL_TERMINATE)
DestMaxLength += sizeof(UNICODE_NULL);
DestinationString->Buffer = ExAllocatePool(PagedPool, DestMaxLength);
if (DestinationString->Buffer == NULL)
return STATUS_NO_MEMORY;
RtlCopyMemory(DestinationString->Buffer, SourceString->Buffer, SourceString->Length);
DestinationString->Length = SourceString->Length;
DestinationString->MaximumLength = DestMaxLength;
if (Flags & RTL_DUPLICATE_UNICODE_STRING_NULL_TERMINATE)
DestinationString->Buffer[DestinationString->Length / sizeof(WCHAR)] = 0;
}
return STATUS_SUCCESS;
}