RtlUnicodeStringExHandleFill - NtDoc

#ifndef _NTSTRSAFE_H_INCLUDED_
#ifndef NTSTRSAFE_NO_UNICODE_STRING_FUNCTIONS

NTSTRSAFEWORKERDDI
RtlUnicodeStringExHandleFill(
        _Out_writes_(cchRemaining) wchar_t* pszDestEnd,
        _In_ size_t cchRemaining,
        _In_ DWORD dwFlags);

#endif
#endif
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#ifndef _NTSTRSAFE_H_INCLUDED_
// Below here are the worker functions that actually do the work
#if defined(NTSTRSAFE_LIB_IMPL) || !defined(NTSTRSAFE_LIB)
#ifndef NTSTRSAFE_NO_UNICODE_STRING_FUNCTIONS

NTSTRSAFEWORKERDDI
    RtlUnicodeStringExHandleFill(
            _Out_writes_(cchRemaining) wchar_t* pszDestEnd,
            _In_ size_t cchRemaining,
            _In_ DWORD dwFlags)
{
    size_t cbRemaining;

    // safe to multiply cchRemaining * sizeof(wchar_t) since cchRemaining < NTSTRSAFE_UNICODE_STRING_MAX_CCH and sizeof(wchar_t) is 2
    cbRemaining = cchRemaining * sizeof(wchar_t);

    memset(pszDestEnd, STRSAFE_GET_FILL_PATTERN(dwFlags), cbRemaining);

    return STATUS_SUCCESS;
}

#endif
#endif
#endif
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#ifndef _NTSTRSAFE_H_INCLUDED_
// Do not call these functions, they are worker functions for internal use within this file
#ifdef DEPRECATE_SUPPORTED
// ...
#else

#define RtlUnicodeStringExHandleFill        RtlUnicodeStringExHandleFill_do_not_call_this_function

#endif
#endif
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