access.cpp

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//
// 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;
}