eliminate the && through constant folding." */
#if defined (STDC_HEADERS) || (!defined (isascii) && !defined (HAVE_ISASCII))
-#define ISASCII(c) 1
+#define IN_CTYPE_DOMAIN(c) 1
#else
-#define ISASCII(c) isascii(c)
+#define IN_CTYPE_DOMAIN(c) isascii(c)
#endif
#ifdef isblank
-#define ISBLANK(c) (ISASCII (c) && isblank (c))
+#define ISBLANK(c) (IN_CTYPE_DOMAIN (c) && isblank (c))
#else
#define ISBLANK(c) ((c) == ' ' || (c) == '\t')
#endif
#ifdef isgraph
-#define ISGRAPH(c) (ISASCII (c) && isgraph (c))
+#define ISGRAPH(c) (IN_CTYPE_DOMAIN (c) && isgraph (c))
#else
-#define ISGRAPH(c) (ISASCII (c) && isprint (c) && !isspace (c))
+#define ISGRAPH(c) (IN_CTYPE_DOMAIN (c) && isprint (c) && !isspace (c))
#endif
-#define ISPRINT(c) (ISASCII (c) && isprint (c))
-#define ISDIGIT(c) (ISASCII (c) && isdigit (c))
-#define ISALNUM(c) (ISASCII (c) && isalnum (c))
-#define ISALPHA(c) (ISASCII (c) && isalpha (c))
-#define ISCNTRL(c) (ISASCII (c) && iscntrl (c))
-#define ISLOWER(c) (ISASCII (c) && islower (c))
-#define ISPUNCT(c) (ISASCII (c) && ispunct (c))
-#define ISSPACE(c) (ISASCII (c) && isspace (c))
-#define ISUPPER(c) (ISASCII (c) && isupper (c))
-#define ISXDIGIT(c) (ISASCII (c) && isxdigit (c))
+#define ISPRINT(c) (IN_CTYPE_DOMAIN (c) && isprint (c))
+#define ISDIGIT(c) (IN_CTYPE_DOMAIN (c) && isdigit (c))
+#define ISALNUM(c) (IN_CTYPE_DOMAIN (c) && isalnum (c))
+#define ISALPHA(c) (IN_CTYPE_DOMAIN (c) && isalpha (c))
+#define ISCNTRL(c) (IN_CTYPE_DOMAIN (c) && iscntrl (c))
+#define ISLOWER(c) (IN_CTYPE_DOMAIN (c) && islower (c))
+#define ISPUNCT(c) (IN_CTYPE_DOMAIN (c) && ispunct (c))
+#define ISSPACE(c) (IN_CTYPE_DOMAIN (c) && isspace (c))
+#define ISUPPER(c) (IN_CTYPE_DOMAIN (c) && isupper (c))
+#define ISXDIGIT(c) (IN_CTYPE_DOMAIN (c) && isxdigit (c))
#ifndef NULL
#define NULL (void *)0