msvc/Windows Kits/10/Source/10.0.26100.0/ucrt/filesystem/access.cpp

//
// access.cpp
//
//      Copyright (c) Microsoft Corporation. All rights reserved.
//
// The _access() and _access_s() functions, which test file accessibility.
//
#include <corecrt_internal.h>
#include <io.h>
#include <corecrt_internal_win32_buffer.h>

// See _waccess_s for information about this function's behavior.
extern "C" errno_t __cdecl _access_s(char const* const path, int const access_mode)
{
    if (path == nullptr) {
        return _waccess_s(nullptr, access_mode);
    }

    __crt_internal_win32_buffer<wchar_t> wide_path;

    errno_t const cvt = __acrt_mbs_to_wcs_cp(path, wide_path, __acrt_get_utf8_acp_compatibility_codepage());

    if (cvt != 0) {
        return -1;
    }

    return _waccess_s(wide_path.data(), access_mode);
}

// The same as _access_s, but transforms all errors into a -1 return value.
extern "C" int __cdecl _access(char const* const path, int const access_mode)
{
    return _access_s(path, access_mode) == 0 ? 0 : -1;
}