[UCRT] Import Microsoft.Windows.SDK.CRTSource version 10.0.22621.3

Imported from https://www.nuget.org/packages/Microsoft.Windows.SDK.CRTSource/10.0.22621.3
License: MIT

sdk/lib/ucrt/filesystem/waccess.cpp

@@ -0,0 +1,55 @@
+//
+// waccess.cpp
+//
+//      Copyright (c) Microsoft Corporation. All rights reserved.
+//
+// The _waccess() and _waccess_s() functions, which test file accessibility.
+//
+#include <corecrt_internal.h>
+#include <io.h>
+
+
+
+// Tests whether the specified file can be accessed with the specified mode.  The
+// access_mode must be one of:  0 (exist only), 2 (write), 4 (read), 6 (read and
+// write).  Returns zero if the file can be accessed with the given mode; returns
+// an error code otherwise or if an error occurs.
+extern "C" errno_t __cdecl _waccess_s(wchar_t const* const path, int const access_mode)
+{
+    _VALIDATE_CLEAR_OSSERR_RETURN_ERRCODE(path != nullptr,           EINVAL);
+    _VALIDATE_CLEAR_OSSERR_RETURN_ERRCODE((access_mode & (~6)) == 0, EINVAL);
+
+    WIN32_FILE_ATTRIBUTE_DATA attributes;
+    if (!GetFileAttributesExW(path, GetFileExInfoStandard, &attributes))
+    {
+        __acrt_errno_map_os_error(GetLastError());
+        return errno;
+    }
+
+    // All directories have both read and write access:
+    if (attributes.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
+        return 0;
+
+    // If we require write access, make sure the read only flag is not set:
+    bool const file_is_read_only = (attributes.dwFileAttributes & FILE_ATTRIBUTE_READONLY) != 0;
+    bool const mode_requires_write = (access_mode & 2) != 0;
+    
+    if (file_is_read_only && mode_requires_write)
+    {
+        _doserrno = ERROR_ACCESS_DENIED;
+        errno = EACCES;
+        return errno;
+    }
+
+    // Otherwise, the file is accessible:
+    return 0;
+
+}
+
+
+
+// The same as _waccess_s, but transforms all errors into a -1 return value.
+extern "C" int __cdecl _waccess(wchar_t const* const path, int const access_mode)
+{
+    return _waccess_s(path, access_mode) == 0 ? 0 : -1;
+}