in_lookup1
if ((line = in_lookup1(ypdom, key, domain, map)) == NULL)
line = in_lookup1(ypdom, NULL, domain, map);
if (((line = in_lookup1(ypdom, key, NULL, map)) == NULL) &&
((line = in_lookup1(ypdom, NULL, NULL, map)) == NULL))
static char *in_lookup1(const char *, const char *,