C_DIGIT
} while (ctype(c, C_ALPHA|C_DIGIT));
} else if (ctype(c, C_DIGIT|C_VAR1)) {
setctypes("0123456789", C_DIGIT);
#define digit(c) ctype(c, C_DIGIT)
#define letnum(c) ctype(c, C_ALPHA|C_DIGIT)