From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Wed, 9 Nov 2011 15:51:00 +0000 (-0800)
Subject: Fix up air use calculations for new pressure handling
X-Git-Url: http://git.tdb.fi/?a=commitdiff_plain;h=c32cff2c6be74a6284f940328622740953008020;p=ext%2Fsubsurface.git

Fix up air use calculations for new pressure handling

Make sure that we calculate air use by using the proper start/end
pressures, with the manually set ones being used preferentially over any
possible sample data.

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

diff --git a/divelist.c b/divelist.c
index 2d04eb5..eb8f231 100644
--- a/divelist.c
+++ b/divelist.c
@@ -299,6 +299,7 @@ static double calculate_airuse(struct dive *dive)
 	int i;
 
 	for (i = 0; i < MAX_CYLINDERS; i++) {
+		pressure_t start, end;
 		cylinder_t *cyl = dive->cylinder + i;
 		int size = cyl->type.size.mliter;
 		double kilo_atm;
@@ -306,7 +307,9 @@ static double calculate_airuse(struct dive *dive)
 		if (!size)
 			continue;
 
-		kilo_atm = (to_ATM(cyl->start) - to_ATM(cyl->end)) / 1000.0;
+		start = cyl->start.mbar ? cyl->start : cyl->sample_start;
+		end = cyl->end.mbar ? cyl->end : cyl->sample_end;
+		kilo_atm = (to_ATM(start) - to_ATM(end)) / 1000.0;
 
 		/* Liters of air at 1 atm == milliliters at 1k atm*/
 		airuse += kilo_atm * size;