FILE
	/usr/common/sys/stringd.c

NAME
	is_alphanum - return whether a string is entirely alphanumeric

PROTOTYPE
	int is_alphanum(string str)

CALLED BY
	Anybody

DESCRIPTION
	Returns true if the string consists only of uppercase or
	lowercase alphabetic characters and digits.  That means no
	whitespace, no punctuation, no newlines and so on.

RETURN VALUE
	1 for true, 0 for false.

ERRORS
	Normally none.

SEE ALSO
	is_whitespace, is_alpha, is_ident