reactos/lib/ntdll/stdlib/mbstowcs.c

   1 /* $Id$
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS kernel
   5  * FILE:            lib/ntdll/stdlib/mbstowcs.c
   6  * PURPOSE:         converts a multi byte string to a unicode string
   7  */
   8
   9 #include <ddk/ntddk.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12
  13 /*
  14  * @implemented
  15  */
  16 size_t mbstowcs (wchar_t *wcstr, const char *mbstr, size_t count)
  17 {
  18         NTSTATUS Status;
  19         ULONG Size;
  20         ULONG Length;
  21
  22         Length = strlen (mbstr);
  23
  24         if (wcstr == NULL)
  25         {
  26                 RtlMultiByteToUnicodeSize (&Size,
  27                                            (char *)mbstr,
  28                                            Length);
  29
  30                 return (size_t)Size;
  31         }
  32
  33         Status = RtlMultiByteToUnicodeN (wcstr,
  34                                          count,
  35                                          &Size,
  36                                          (char *)mbstr,
  37                                          Length);
  38         if (!NT_SUCCESS(Status))
  39                 return -1;
  40
  41         return (size_t)Size;
  42 }
  43
  44 /* EOF */