reactos/sdk/lib/crt/string/mbstowcs_nt.c

   1 #include <ndk/umtypes.h>
   2 #include <ndk/rtlfuncs.h>
   3 #include <string.h>
   4
   5 #undef MB_CUR_MAX
   6 #define MB_CUR_MAX 2
   7
   8 /*
   9  * @implemented
  10  */
  11 int mbtowc (wchar_t *wchar, const char *mbchar, size_t count)
  12 {
  13         UCHAR mbarr[MB_CUR_MAX] = { 0 };
  14         PUCHAR mbs = mbarr;
  15         WCHAR wc;
  16
  17         if (mbchar == NULL)
  18                 return 0;
  19
  20         if (wchar == NULL)
  21                 return 0;
  22
  23         memcpy(mbarr, mbchar, min(count, sizeof mbarr));
  24
  25         wc = RtlAnsiCharToUnicodeChar(&mbs);
  26
  27         if (wc == L' ' && mbarr[0] != ' ')
  28                 return -1;
  29
  30         *wchar = wc;
  31
  32         return (int)(mbs - mbarr);
  33 }
  34
  35 /*
  36  * @implemented
  37  */
  38 size_t mbstowcs (wchar_t *wcstr, const char *mbstr, size_t count)
  39 {
  40         NTSTATUS Status;
  41         ULONG Size;
  42         ULONG Length;
  43
  44         Length = (ULONG)strlen (mbstr);
  45
  46         if (wcstr == NULL)
  47         {
  48                 RtlMultiByteToUnicodeSize (&Size,
  49                                            mbstr,
  50                                            Length);
  51
  52                 return (size_t)(Size / sizeof(wchar_t));
  53         }
  54
  55         Status = RtlMultiByteToUnicodeN (wcstr,
  56                                          (ULONG)count * sizeof(WCHAR),
  57                                          &Size,
  58                                          mbstr,
  59                                          Length);
  60         if (!NT_SUCCESS(Status))
  61                 return -1;
  62
  63         return (size_t)(Size / sizeof(wchar_t));
  64 }
  65
  66 /* EOF */