Add a few more conversion helper functions to dive.h

Convert feet to mm, psi to mbar, and F to mkelvin.  We do this elsewhere
too, but I'm going to need it for the Cochran CSV files, so let's do the
helpers now.

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

1 files changed, 18 insertions, 2 deletions

diff --git a/dive.h b/dive.h
index 4d60a77a2..6b5c77816 100644
--- a/dive.h
+++ b/dive.h
@@ -125,21 +125,31 @@ static inline double mm_to_feet(int mm)
 	return mm * 0.00328084;
 }
 
+static inline unsigned long feet_to_mm(double feet)
+{
+	return feet * 304.8 + 0.5;
+}
+
 static inline int to_feet(depth_t depth)
 {
 	return mm_to_feet(depth.mm) + 0.5;
 }
 
-static double mkelvin_to_C(int mkelvin)
+static inline double mkelvin_to_C(int mkelvin)
 {
 	return (mkelvin - 273150) / 1000.0;
 }
 
-static double mkelvin_to_F(int mkelvin)
+static inline double mkelvin_to_F(int mkelvin)
 {
 	return mkelvin * 9 / 5000.0 - 459.670;
 }
 
+static inline unsigned long F_to_mkelvin(double f)
+{
+	return (f-32) * 1000 / 1.8 + 273150.5;
+}
+
 static inline int to_C(temperature_t temp)
 {
 	if (!temp.mkelvin)
@@ -165,6 +175,12 @@ static inline double psi_to_bar(double psi)
 {
 	return psi / 14.5037738;
 }
+
+static inline unsigned long psi_to_mbar(double psi)
+{
+	return psi_to_bar(psi)*1000 + 0.5;
+}
+
 static inline int to_PSI(pressure_t pressure)
 {
 	return pressure.mbar * 0.0145037738 + 0.5;