crda: annotate intersection worst case scenerio

In the worst case scenerio of regulatory domain intersections
between a different set of regulatory rules you will end up
without being able to initiate radiation on any frequency
range. Provide a hint as to what needs to be done next in
order to actually build a useful regulatory domain. Currently
we do this manually but building the mathematics would be
even more useful as we grow usage of the spectrum.

Signed-off-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/intersect.c b/intersect.c
index dea9145..169fe1a 100644
--- a/intersect.c
+++ b/intersect.c
@@ -83,7 +83,14 @@ int main(int argc, char **argv)
 		printf("%d regulatory domains intersected\n", intersected);
 	else {
 		world = prev_world;
-		printf("Only one intersection completed\n");
+		printf("No intersections completed\n");
+		if (idx > 1) {
+			printf("Since more than one regulatory domain is "
+			       "present and no intersections were possible "
+			       "no globally allowed spectrum is possible so "
+			       "consider enabling passive scan flags\n");
+			return r;
+		}
 	}
 
 	/* Tada! */