misc.c

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/*
 * PROJECT:     ReactOS i8042 (ps/2 keyboard-mouse controller) driver
 * LICENSE:     GPL - See COPYING in the top level directory
 * FILE:        drivers/input/i8042prt/misc.c
 * PURPOSE:     Miscellaneous operations
 * PROGRAMMERS: Copyright 2006-2007 Herv� Poussineau (hpoussin@reactos.org)
 */
 
/* INCLUDES ******************************************************************/
 
#include "i8042prt.h"
 
#include <debug.h>
 
/* FUNCTIONS *****************************************************************/
 
NTSTATUS NTAPI
ForwardIrpAndForget(
    IN PDEVICE_OBJECT DeviceObject,
    IN PIRP Irp)
{
    PDEVICE_OBJECT LowerDevice = ((PFDO_DEVICE_EXTENSION)DeviceObject->DeviceExtension)->LowerDevice;
 
    ASSERT(LowerDevice);
 
    IoSkipCurrentIrpStackLocation(Irp);
    return IoCallDriver(LowerDevice, Irp);
}
 
NTSTATUS
DuplicateUnicodeString(
    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 = ExAllocatePoolWithTag(PagedPool, DestMaxLength, I8042PRT_TAG);
        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;
}