-# undef ISSPACE
-# undef ISDIGIT
-# undef ISXDIGIT
-# undef ISALPHA
-# undef ISALNUM
-# undef TOLOWER
-# undef TOUPPER
-
-# define ISSPACE(x) isspace (x)
-# define ISDIGIT(x) isdigit (x)
-# define ISXDIGIT(x) isxdigit (x)
-# define ISALPHA(x) isalpha (x)
-# define ISALNUM(x) isalnum (x)
-# define TOLOWER(x) tolower (x)
-# define TOUPPER(x) toupper (x)
+# undef c_isspace
+# undef c_isdigit
+# undef c_isxdigit
+# undef c_isalpha
+# undef c_isalnum
+# undef c_tolower
+# undef c_toupper
+
+# define c_isspace(x) isspace (x)
+# define c_isdigit(x) isdigit (x)
+# define c_isxdigit(x) isxdigit (x)
+# define c_isalpha(x) isalpha (x)
+# define c_isalnum(x) isalnum (x)
+# define c_tolower(x) tolower (x)
+# define c_toupper(x) toupper (x)