ISDIGIT
#define ISDIGIT(c) (isascii (c) && isdigit (c))
# define ISDIGIT(Ch) isdigit (Ch)
# define ISDIGIT(Ch) iswdigit (Ch)
# define ISDIGIT(Ch) isdigit (Ch)
# define ISDIGIT(Ch) iswdigit (Ch)
# define ISDIGIT(Ch) ((unsigned int) ((Ch) - L'0') < 10)
# define ISDIGIT(Ch) ((unsigned int) ((Ch) - '0') < 10)
# define ISDIGIT(Ch) iswdigit (Ch)
# define ISDIGIT(Ch) isdigit_l (Ch, loc)
# define ISDIGIT(Ch) __iswdigit_l ((Ch), loc)
# define ISDIGIT(Ch) iswdigit (Ch)
# define ISDIGIT(Ch) __isdigit_l ((Ch), loc)
# define ISDIGIT(Ch) isdigit (Ch)