Split gas functions out from deco.c

4 files changed, 74 insertions, 55 deletions

diff --git a/src/deco.c b/src/deco.c
index 7a7b736..08a3957 100644
--- a/src/deco.c
+++ b/src/deco.c
@@ -13,7 +13,6 @@ enum UNITS UNITS = UNITS_DEFAULT;
 double SURFACE_PRESSURE = SURFACE_PRESSURE_DEFAULT;
 double P_WV = P_WV_DEFAULT;
 
-double PO2_MAX = PO2_MAX_DEFAULT;
 double END_MAX = END_MAX_DEFAULT;
 
 typedef struct zhl_n2_t {
@@ -117,41 +116,6 @@ double gauge_depth(double ad)
     return ad - SURFACE_PRESSURE;
 }
 
-gas_t gas_new(unsigned char o2, unsigned char he, double mod)
-{
-    assert(o2 + he <= 100);
-
-    if (mod == MOD_AUTO)
-        mod = PO2_MAX / (o2 / 100.0);
-
-    return (gas_t){.o2 = o2, .he = he, .n2 = 100 - o2 - he, .mod = mod};
-}
-
-int gas_equal(const gas_t *g1, const gas_t *g2)
-{
-    return g1->o2 == g2->o2 && g1->he == g2->he && g1->mod == g2->mod;
-}
-
-unsigned char gas_o2(const gas_t *gas)
-{
-    return gas->o2;
-}
-
-unsigned char gas_he(const gas_t *gas)
-{
-    return gas->he;
-}
-
-unsigned char gas_n2(const gas_t *gas)
-{
-    return gas->n2;
-}
-
-double gas_mod(const gas_t *gas)
-{
-    return gas->mod;
-}
-
 void add_segment_ascdec(decostate_t *ds, double dstart, double dend, double time, const gas_t *gas)
 {
     assert(time > 0);
diff --git a/src/deco.h b/src/deco.h
index 074316e..1ec5645 100644
--- a/src/deco.h
+++ b/src/deco.h
@@ -5,6 +5,8 @@
 
 #include <stddef.h>
 
+#include "gas.h"
+
 #define max(X, Y) (((X) > (Y)) ? (X) : (Y))
 #define min(X, Y) (((X) < (Y)) ? (X) : (Y))
 #define len(X) (sizeof(X) / sizeof((X)[0]))
@@ -18,11 +20,6 @@
 #define SURFACE_PRESSURE_DEFAULT 1.01325
 #define P_WV_DEFAULT P_WV_BUHL
 
-#define PO2_MAX_DEFAULT 1.6
-#define END_MAX_DEFAULT 4.01325
-
-#define MOD_AUTO 0
-
 /* types */
 enum UNITS {
     METRIC,
@@ -35,13 +32,6 @@ enum ALGO {
     ZHL_16C = 2,
 };
 
-typedef struct gas_t {
-    unsigned char o2;
-    unsigned char he;
-    unsigned char n2;
-    double mod;
-} gas_t;
-
 typedef struct decostate_t {
     double pn2[16];
     double phe[16];
@@ -75,13 +65,6 @@ double bar_to_xsw(double bar);
 double abs_depth(double gd);
 double gauge_depth(double ad);
 
-gas_t gas_new(unsigned char o2, unsigned char he, double mod);
-int gas_equal(const gas_t *g1, const gas_t *g2);
-unsigned char gas_o2(const gas_t *gas);
-unsigned char gas_he(const gas_t *gas);
-unsigned char gas_n2(const gas_t *gas);
-double gas_mod(const gas_t *gas);
-
 void add_segment_ascdec(decostate_t *ds, double dstart, double dend, double time, const gas_t *gas);
 void add_segment_const(decostate_t *ds, double depth, double time, const gas_t *gas);
 double get_gf(const decostate_t *ds, double depth);
diff --git a/src/gas.c b/src/gas.c
new file mode 100644
index 0000000..c59db2c
--- /dev/null
+++ b/src/gas.c
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: MIT-0 */
+
+#include <assert.h>
+
+#include "gas.h"
+
+double PO2_MAX = PO2_MAX_DEFAULT;
+
+gas_t gas_new(unsigned char o2, unsigned char he, double mod)
+{
+    assert(o2 + he <= 100);
+
+    if (mod == MOD_AUTO)
+        mod = PO2_MAX / (o2 / 100.0);
+
+    return (gas_t){.o2 = o2, .he = he, .n2 = 100 - o2 - he, .mod = mod};
+}
+
+int gas_equal(const gas_t *g1, const gas_t *g2)
+{
+    return g1->o2 == g2->o2 && g1->he == g2->he && g1->mod == g2->mod;
+}
+
+unsigned char gas_o2(const gas_t *gas)
+{
+    return gas->o2;
+}
+
+unsigned char gas_he(const gas_t *gas)
+{
+    return gas->he;
+}
+
+unsigned char gas_n2(const gas_t *gas)
+{
+    return gas->n2;
+}
+
+double gas_mod(const gas_t *gas)
+{
+    return gas->mod;
+}
diff --git a/src/gas.h b/src/gas.h
new file mode 100644
index 0000000..ca38a8d
--- /dev/null
+++ b/src/gas.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: MIT-0 */
+
+#ifndef GAS_H
+#define GAS_H
+
+#define PO2_MAX_DEFAULT 1.6
+#define END_MAX_DEFAULT 4.01325
+
+extern double PO2_MAX;
+extern double END_MAX;
+
+#define MOD_AUTO 0
+
+/* types */
+typedef struct gas_t {
+    unsigned char o2;
+    unsigned char he;
+    unsigned char n2;
+    double mod;
+} gas_t;
+
+/* functions */
+gas_t gas_new(unsigned char o2, unsigned char he, double mod);
+int gas_equal(const gas_t *g1, const gas_t *g2);
+unsigned char gas_o2(const gas_t *gas);
+unsigned char gas_he(const gas_t *gas);
+unsigned char gas_n2(const gas_t *gas);
+double gas_mod(const gas_t *gas);
+
+#endif /* end of include guard: GAS_H */