+/*
+ * Either/both S_ISxxx and/or S_IFxxx are defined in sys/types.h; some systems
+ * lack one or the other.
+ */
+#ifndef S_ISDIR
+#define S_ISDIR(mode) ((mode & S_IFMT) == S_IFDIR)
+#endif
+
+#ifndef S_ISREG
+#define S_ISREG(mode) ((mode & S_IFMT) == S_IFREG)
+#endif
+