huwcampbell.com
Reactos
1/*
2 * COPYRIGHT: See COPYING in the top level directory
3 * PROJECT: ReactOS Keyboard class driver
4 * FILE: drivers/input/kbdclass/misc.c
5 * PURPOSE: Miscellaneous operations
6 *
7 * PROGRAMMERS: Herv� Poussineau (hpoussin@reactos.org)
8 */
9
10#include "kbdclass.h"
11
12#include <debug.h>
13
14
15NTSTATUS NTAPI
16ForwardIrpAndForget(
17 IN PDEVICE_OBJECT DeviceObject,
18 IN PIRP Irp)
19{
20 PDEVICE_OBJECT LowerDevice;
21
22 ASSERT(!((PCOMMON_DEVICE_EXTENSION)DeviceObject->DeviceExtension)->IsClassDO);
23 LowerDevice = ((PPORT_DEVICE_EXTENSION)DeviceObject->DeviceExtension)->LowerDevice;
24
25 IoSkipCurrentIrpStackLocation(Irp);
26 return IoCallDriver(LowerDevice, Irp);
27}
28
29NTSTATUS
30DuplicateUnicodeString(
31 IN ULONG Flags,
32 IN PCUNICODE_STRING SourceString,
33 OUT PUNICODE_STRING DestinationString)
34{
35 if (SourceString == NULL || DestinationString == NULL
36 || SourceString->Length > SourceString->MaximumLength
37 || (SourceString->Length == 0 && SourceString->MaximumLength > 0 && SourceString->Buffer == NULL)
38 || Flags == RTL_DUPLICATE_UNICODE_STRING_ALLOCATE_NULL_STRING || Flags >= 4)
39 {
40 return STATUS_INVALID_PARAMETER;
41 }
42
43
44 if ((SourceString->Length == 0)
45 && (Flags != (RTL_DUPLICATE_UNICODE_STRING_NULL_TERMINATE |
46 RTL_DUPLICATE_UNICODE_STRING_ALLOCATE_NULL_STRING)))
47 {
48 DestinationString->Length = 0;
49 DestinationString->MaximumLength = 0;
50 DestinationString->Buffer = NULL;
51 }
52 else
53 {
54 USHORT DestMaxLength = SourceString->Length;
55
56 if (Flags & RTL_DUPLICATE_UNICODE_STRING_NULL_TERMINATE)
57 DestMaxLength += sizeof(UNICODE_NULL);
58
59 DestinationString->Buffer = ExAllocatePoolWithTag(PagedPool, DestMaxLength, CLASS_TAG);
60 if (DestinationString->Buffer == NULL)
61 return STATUS_NO_MEMORY;
62
63 RtlCopyMemory(DestinationString->Buffer, SourceString->Buffer, SourceString->Length);
64 DestinationString->Length = SourceString->Length;
65 DestinationString->MaximumLength = DestMaxLength;
66
67 if (Flags & RTL_DUPLICATE_UNICODE_STRING_NULL_TERMINATE)
68 DestinationString->Buffer[DestinationString->Length / sizeof(WCHAR)] = 0;
69 }
70
71 return STATUS_SUCCESS;
72}