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 size_t mbstowcs (wchar_t *wcstr, const char *mbstr, size_t count)
  14 {
  15         NTSTATUS Status;
  16         ULONG Size;
  17         ULONG Length;
  18
  19         Length = strlen (mbstr);
  20
  21         if (wcstr == NULL)
  22         {
  23                 RtlMultiByteToUnicodeSize (&Size,
  24                                            (char *)mbstr,
  25                                            Length);
  26
  27                 return (size_t)Size;
  28         }
  29
  30         Status = RtlMultiByteToUnicodeN (wcstr,
  31                                          count,
  32                                          &Size,
  33                                          (char *)mbstr,
  34                                          Length);
  35         if (!NT_SUCCESS(Status))
  36                 return -1;
  37
  38         return (size_t)Size;
  39 }
  40
  41 /* EOF */