+/* Catch erroneous use of ctype macros. Files that really know what
+ they're doing can disable this check by defining the
+ I_REALLY_WANT_CTYPE_MACROS preprocessor constant. */
+
+#ifndef I_REALLY_WANT_CTYPE_MACROS
+
+#undef isalpha
+#define isalpha *** Please use ISALPHA ***
+#undef isalnum
+#define isalnum *** Please use ISALNUM ***
+#undef isblank
+#define isblank *** Please use ISBLANK ***
+#undef iscntrl
+#define iscntrl *** Please use ISCNTRL ***
+#undef isdigit
+#define isdigit *** Please use ISDIGIT ***
+#undef isgraph
+#define isgraph *** Please use ISGRAPH ***
+#undef islower
+#define islower *** Please use ISLOWER ***
+#undef isprint
+#define isprint *** Please use ISPRINT ***
+#undef ispunct
+#define ispunct *** Please use ISPUNCT ***
+#undef isspace
+#define isspace *** Please use ISSPACE ***
+#undef isupper
+#define isupper *** Please use ISUPPER ***
+#undef isxdigit
+#define isxdigit *** Please use ISXDIGIT ***
+
+#endif /* I_REALLY_WANT_CTYPE_MACROS */