1 files changed, 32 insertions, 0 deletions
diff --git a/src/deco.c b/src/deco.c
index e1ea401..349c8e5 100644
--- a/src/deco.c
+++ b/src/deco.c
@@ -9,6 +9,7 @@
 #define RND(x) (round((x) *10000) / 10000)
 
 enum ALGO ALGO_VER = ALGO_VER_DEFAULT;
+enum UNITS UNITS = UNITS_DEFAULT;
 double SURFACE_PRESSURE = SURFACE_PRESSURE_DEFAULT;
 double P_WV = P_WV_DEFAULT;
 
@@ -77,6 +78,37 @@ double msw_to_bar(double msw)
     return msw / 10;
 }
 
+double bar_to_fsw(double bar)
+{
+    return (bar / 1.01325) * 33.0;
+}
+
+double fsw_to_bar(double fsw)
+{
+    return (fsw * 1.01325) / 33.0;
+}
+
+double msw_or_fsw(double msw, double fsw)
+{
+    assert(UNITS == METRIC || UNITS == IMPERIAL);
+
+    return (UNITS == METRIC) ? msw : fsw;
+}
+
+double xsw_to_bar(double xsw)
+{
+    assert(UNITS == METRIC || UNITS == IMPERIAL);
+
+    return (UNITS == METRIC) ? msw_to_bar(xsw) : fsw_to_bar(xsw);
+}
+
+double bar_to_xsw(double bar)
+{
+    assert(UNITS == METRIC || UNITS == IMPERIAL);
+
+    return (UNITS == METRIC) ? bar_to_msw(bar) : bar_to_fsw(bar);
+}
+
 double abs_depth(double gd)
 {
     return gd + SURFACE_PRESSURE;