Start cleaning up dive accessors

I'm going to add a menu to import (and eventually export) dives, and so
we'd like to be able to start out with no dives at all.  Right now we
croak if that happens - it's not like the code has been written with
actual end users in mind.

So start cleaning things up.  First make the 'current_dive' macro work
right even for invalid dives.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/dive.h b/dive.h
index a8e3c319a..23e2f544c 100644
--- a/dive.h
+++ b/dive.h
@@ -121,6 +121,13 @@ struct dive_table {
 
 extern struct dive_table dive_table;
 
+static inline struct dive *get_dive(unsigned int nr)
+{
+	if (nr >= dive_table.nr)
+		return NULL;
+	return dive_table.dives[nr];
+}
+
 extern void parse_xml_init(void);
 extern void parse_xml_file(const char *filename);