- in a system-independent manner. Note that USG (at least) define
- _POSIX_VDISABLE as 0! */
-
-#ifdef _POSIX_VDISABLE
-#define CDISABLE _POSIX_VDISABLE
-#else /* not _POSIX_VDISABLE */
-#ifdef CDEL
-#undef CDISABLE
-#define CDISABLE CDEL
-#else /* not CDEL */
-#define CDISABLE 255
-#endif /* not CDEL */
-#endif /* not _POSIX_VDISABLE */
+ in a system-independent manner.
+ We use the POSIX standard way to do this, and emulate on other systems. */
+
+#ifndef _POSIX_VDISABLE
+# if defined CDEL
+# define _POSIX_VDISABLE CDEL
+# else
+# define _POSIX_VDISABLE 255
+# endif
+#endif /* ! _POSIX_VDISABLE */