These functions operate on the netgroup database file
which is described
The database defines a set of netgroups, each made up of one or more triples:
(host, user, domain)
that defines a combination of host, user and domain.
Any of the three fields may be specified as wildcards that match any
sets the three pointer arguments to the strings of the next member of the
If any of the string pointers are
that field is considered a wildcard.
set the current netgroup and terminate the current netgroup respectively.
is called with a different netgroup than the previous call, an implicit
also sets the offset to the first member of the netgroup.
searches for a match of all fields within the specified group.
If any of the
those fields will match any string value in the netgroup member.