This really needs to go in a branch. It needs heavy testing and can't coincide with the current shell32 due to PSDK interface changes

svn path=/branches/shell32_new-bringup/; revision=51893

lib/sdk/crt/string/mbstowcs_nt.c

@@ -0,0 +1,69 @@
+#define WIN32_NO_STATUS
+#include <windows.h>
+#include <ndk/umtypes.h>
+#include <ndk/rtlfuncs.h>
+#include <string.h>
+
+WCHAR NTAPI RtlAnsiCharToUnicodeChar(IN OUT PUCHAR *AnsiChar);
+#undef MB_CUR_MAX
+#define MB_CUR_MAX 2
+
+/*
+ * @implemented
+ */
+int mbtowc (wchar_t *wchar, const char *mbchar, size_t count)
+{
+	UCHAR mbarr[MB_CUR_MAX] = { 0 };
+	PUCHAR mbs = mbarr;
+	WCHAR wc;
+
+	if (mbchar == NULL)
+		return 0;
+
+	if (wchar == NULL)
+		return 0;
+
+	memcpy(mbarr, mbchar, min(count, sizeof mbarr));
+
+	wc = RtlAnsiCharToUnicodeChar(&mbs);
+
+	if (wc == L' ' && mbarr[0] != ' ')
+		return -1;
+
+	*wchar = wc;
+
+	return mbs - mbarr;
+}
+
+/*
+ * @implemented
+ */
+size_t mbstowcs (wchar_t *wcstr, const char *mbstr, size_t count)
+{
+	NTSTATUS Status;
+	ULONG Size;
+	ULONG Length;
+
+	Length = strlen (mbstr);
+
+	if (wcstr == NULL)
+	{
+		RtlMultiByteToUnicodeSize (&Size,
+		                           mbstr,
+		                           Length);
+
+		return (size_t)Size;
+	}
+
+	Status = RtlMultiByteToUnicodeN (wcstr,
+	                                 count * sizeof(WCHAR),
+	                                 &Size,
+	                                 mbstr,
+	                                 Length);
+	if (!NT_SUCCESS(Status))
+		return -1;
+
+	return (size_t)Size;
+}
+
+/* EOF */