Rename variable to better reflect what it does

The pressure for the Boyle compensation is of the first ceiling,
i.e. the ceiling seen from the bottom rather than the first
stop.

Signed-off-by: Robert C. Helling <helling@atdotde.de>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/deco.c b/deco.c
index 20d8b0479..7a9f33e5a 100644
--- a/deco.c
+++ b/deco.c
@@ -23,7 +23,7 @@
 
 extern bool in_planner();
 
-extern pressure_t first_stop_pressure;
+extern pressure_t first_ceiling_pressure;
 
 //! Option structure for Buehlmann decompression.
 struct buehlmann_config {
@@ -367,7 +367,7 @@ double solve_cubic2(double B, double C)
 
 double update_gradient(double next_stop_pressure, double first_gradient)
 {
-	double B = cube(first_gradient) / (first_stop_pressure.mbar / 1000.0 + first_gradient);
+	double B = cube(first_gradient) / (first_ceiling_pressure.mbar / 1000.0 + first_gradient);
 	double C = next_stop_pressure * B;
 
 	double new_gradient = solve_cubic2(B, C);
@@ -385,10 +385,10 @@ void boyles_law(double next_stop_pressure)
 		return;
 
 	// This should be a tautology but prevents a numerical instability.
-	if (IS_FP_SAME(next_stop_pressure, first_stop_pressure.mbar / 1000.0))
+	if (IS_FP_SAME(next_stop_pressure, first_ceiling_pressure.mbar / 1000.0))
 		return;
 
-	if (!first_stop_pressure.mbar)
+	if (!first_ceiling_pressure.mbar)
 		return;
 	for (ci = 0; ci < 16; ++ci) {
 		allowable_n2_gradient[ci] = update_gradient(next_stop_pressure, bottom_n2_gradient[ci]);