drivers/storage/fdc/fdc/misc.c

   1 /*
   2  * PROJECT:        ReactOS Floppy Disk Controller Driver
   3  * LICENSE:        GNU GPLv2 only as published by the Free Software Foundation
   4  * FILE:           drivers/storage/fdc/fdc/misc.c
   5  * PURPOSE:        Misc Routines
   6  * PROGRAMMERS:    Eric Kohl
   7  */
   8
   9 /* INCLUDES *******************************************************************/
  10
  11 #include "fdc.h"
  12
  13 #define NDEBUG
  14 #include <debug.h>
  15
  16 /* FUNCTIONS ******************************************************************/
  17
  18 NTSTATUS
  19 DuplicateUnicodeString(
  20     IN ULONG Flags,
  21     IN PCUNICODE_STRING SourceString,
  22     OUT PUNICODE_STRING DestinationString)
  23 {
  24     USHORT DestMaxLength;
  25
  26     if (SourceString == NULL ||
  27         DestinationString == NULL ||
  28         SourceString->Length > SourceString->MaximumLength ||
  29         (SourceString->Length == 0 && SourceString->MaximumLength > 0 && SourceString->Buffer == NULL) ||
  30         Flags == RTL_DUPLICATE_UNICODE_STRING_ALLOCATE_NULL_STRING ||
  31         Flags >= 4)
  32     {
  33         return STATUS_INVALID_PARAMETER;
  34     }
  35
  36     if ((SourceString->Length == 0) &&
  37         (Flags != (RTL_DUPLICATE_UNICODE_STRING_NULL_TERMINATE |
  38                    RTL_DUPLICATE_UNICODE_STRING_ALLOCATE_NULL_STRING)))
  39     {
  40         DestinationString->Length = 0;
  41         DestinationString->MaximumLength = 0;
  42         DestinationString->Buffer = NULL;
  43     }
  44     else
  45     {
  46         DestMaxLength = SourceString->Length;
  47
  48         if (Flags & RTL_DUPLICATE_UNICODE_STRING_NULL_TERMINATE)
  49             DestMaxLength += sizeof(UNICODE_NULL);
  50
  51         DestinationString->Buffer = ExAllocatePoolWithTag(PagedPool, DestMaxLength, FDC_TAG);
  52         if (DestinationString->Buffer == NULL)
  53             return STATUS_NO_MEMORY;
  54
  55         RtlCopyMemory(DestinationString->Buffer, SourceString->Buffer, SourceString->Length);
  56         DestinationString->Length = SourceString->Length;
  57         DestinationString->MaximumLength = DestMaxLength;
  58
  59         if (Flags & RTL_DUPLICATE_UNICODE_STRING_NULL_TERMINATE)
  60             DestinationString->Buffer[DestinationString->Length / sizeof(WCHAR)] = 0;
  61     }
  62
  63     return STATUS_SUCCESS;
  64 }
  65
  66 /* EOF */