Used gas in dive planner points: Support for multiple cyl with same gas

In the planner if one adds two or more cylinders with the same gasmix
(e.g. back gas and bottom stage 18/45) the drop down and data in the
used gas column of the planner points table will be filled with a more
verbose string mentioning also the cyl number and the cyl type
description.
Makes it easier in such a case to select the right cylinder.

Introduces also a helper function which tells you if there is another
cylinder with the same gasmix as the provided cylinder.
This also has an option if it should consider unused cylinders or not.

Signed-off-by: Stefan Fuchs <sfuchs@gmx.de>

1 files changed, 14 insertions, 1 deletions

diff --git a/core/dive.c b/core/dive.c
index 84d476958..59bbef9c8 100644
--- a/core/dive.c
+++ b/core/dive.c
@@ -1858,7 +1858,7 @@ static int sort_event(struct event *a, struct event *b)
 static int same_gas(struct event *a, struct event *b)
 {
 	if (a->type == b->type && a->flags == b->flags && a->value == b->value && !strcmp(a->name, b->name) &&
-			a->gas.mix.o2.permille == b->gas.mix.o2.permille && a->gas.mix.he.permille == b->gas.mix.he.permille) {
+			same_gasmix(&a->gas.mix, &b->gas.mix)) {
 		return true;
 	}
 	return false;
@@ -2078,6 +2078,19 @@ int same_gasmix(struct gasmix *a, struct gasmix *b)
 	return a->o2.permille == b->o2.permille && a->he.permille == b->he.permille;
 }
 
+int same_gasmix_cylinder(cylinder_t *cyl, int cylid, struct dive *dive, bool check_unused)
+{
+	struct gasmix *mygas = &cyl->gasmix;
+	for (int i = 0; i < MAX_CYLINDERS; i++) {
+		if (i == cylid || cylinder_none(&dive->cylinder[i]))
+			continue;
+		struct gasmix *gas2 = &dive->cylinder[i].gasmix;
+		if (gasmix_distance(mygas, gas2) == 0 && (is_cylinder_used(dive, i) || check_unused))
+			return i;
+	}
+	return -1;
+}
+
 static int pdiff(pressure_t a, pressure_t b)
 {
 	return a.mbar && b.mbar && a.mbar != b.mbar;