157 #define	hyphenchar(c) ((c) == 0x2d)  argument
158 #define bslashchar(c) ((c) == 0x5c)  argument
159 #define periodchar(c) ((c) == PERIOD)  argument
160 #define asterchar(c) ((c) == 0x2a)  argument
161 #define alphachar(c) (((c) >= 0x41 && (c) <= 0x5a) \  argument
162 		   || ((c) >= 0x61 && (c) <= 0x7a))
163 #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)  argument
164 #define underscorechar(c)  ((c) == 0x5f)  argument
166 #define borderchar(c) (alphachar(c) || digitchar(c))  argument
167 #define middlechar(c) (borderchar(c) || hyphenchar(c) || underscorechar(c))  argument
168 #define	domainchar(c) ((c) > 0x20 && (c) < 0x7f)  argument