+#if STDC_HEADERS || (! defined isascii && ! HAVE_ISASCII)
+# define IN_CTYPE_DOMAIN(c) true
+#else
+# define IN_CTYPE_DOMAIN(c) isascii (c)
+#endif
+
+static inline bool
+is_space (unsigned char c)
+{
+ return IN_CTYPE_DOMAIN (c) && isspace (c);
+}
+