FILE
	/usr/common/sys/stringd.c

NAME
	is_alpha - return whether a string is entirely alphabetical

PROTOTYPE
	int is_alpha(string str)

CALLED BY
	Anybody

DESCRIPTION
	Returns true if the string consists only of uppercase or
	lowercase alphabetic characters.  That means no numbers, 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_alphanum, is_ident