extern jmp_buf errbuf; /* target of longjmp() on a fatal error */
+#define sc_isspace(x) isspace ((int)((unsigned char)x))
+#define sc_isalpha(x) isalpha ((int)((unsigned char)x))
+#define sc_isdigit(x) isdigit ((int)((unsigned char)x))
+#define sc_isupper(x) isupper ((int)((unsigned char)x))
+#define sc_isxdigit(x) isxdigit((int)((unsigned char)x))
+
#endif