Create a constructor with default parameters for some structs

Structs and classes in C++ are basically the same thing and we want to
create a few zero-initialized values for some of them; Sadly, C++ doesn't
have the nice static struct initialization that C has.

One way to deal with that is to create a constructor and pass default
values to it, another is lambda-initialization, but we don't use C++11,
yet.

Since we initializate stuff on the constructor, we don't need to
re-initializate things again on the initialization list (which is also why
I removed the QStrings from the initialization lists, they are
automatically initialized to empty)

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

subsurface-core/configuredivecomputerthreads.cpp

@@ -1131,37 +1131,27 @@ static dc_status_t read_ostc_settings(dc_device_t *device, DeviceDetails *m_devi
 	// Diluent 1 Default (%O2,%He)
 	// Byte98-99:
 	// Diluent 1 Current (%O2,%He)
-	gas dil1 = {};
-	dil1.oxygen = data[97];
-	dil1.helium = data[98];
+	gas dil1(data[97], data[98]);
 	// Byte100-101:
 	// Gasuent 2 Default (%O2,%He)
 	// Byte102-103:
 	// Gasuent 2 Current (%O2,%He)
-	gas dil2 = {};
-	dil2.oxygen = data[101];
-	dil2.helium = data[102];
+	gas dil2(data[101], data[102]);
 	// Byte104-105:
 	// Gasuent 3 Default (%O2,%He)
 	// Byte106-107:
 	// Gasuent 3 Current (%O2,%He)
-	gas dil3 = {};
-	dil3.oxygen = data[105];
-	dil3.helium = data[106];
+	gas dil3(data[105], data[106]);
 	// Byte108-109:
 	// Gasuent 4 Default (%O2,%He)
 	// Byte110-111:
 	// Gasuent 4 Current (%O2,%He)
-	gas dil4 = {};
-	dil4.oxygen = data[109];
-	dil4.helium = data[110];
+	gas dil4(data[109], data[110]);
 	// Byte112-113:
 	// Gasuent 5 Default (%O2,%He)
 	// Byte114-115:
 	// Gasuent 5 Current (%O2,%He)
-	gas dil5 = {};
-	dil5.oxygen = data[113];
-	dil5.helium = data[114];
+	gas dil5(data[113], data[114]);
 	// Byte116:
 	// First Diluent (1-5)
 	switch (data[115]) {

subsurface-core/devicedetails.cpp

@@ -1,32 +1,19 @@
 #include "devicedetails.h"
 
-// This can probably be done better by someone with better c++-FU
-const struct gas zero_gas = {0};
-const struct setpoint zero_setpoint = {0};
+gas::gas(unsigned char oxygen, unsigned char helium, unsigned char type, unsigned char depth) :
+	oxygen(oxygen), helium(helium), type(type), depth(depth)
+{
+}
+
+setpoint::setpoint(unsigned char sp, unsigned char depth) :
+	sp(sp), depth(depth)
+{
+}
 
 DeviceDetails::DeviceDetails(QObject *parent) :
 	QObject(parent),
 	data(0),
-	serialNo(""),
-	firmwareVersion(""),
-	customText(""),
-	model(""),
 	syncTime(false),
-	gas1(zero_gas),
-	gas2(zero_gas),
-	gas3(zero_gas),
-	gas4(zero_gas),
-	gas5(zero_gas),
-	dil1(zero_gas),
-	dil2(zero_gas),
-	dil3(zero_gas),
-	dil4(zero_gas),
-	dil5(zero_gas),
-	sp1(zero_setpoint),
-	sp2(zero_setpoint),
-	sp3(zero_setpoint),
-	sp4(zero_setpoint),
-	sp5(zero_setpoint),
 	setPointFallback(0),
 	ccrMode(0),
 	calibrationGas(0),

subsurface-core/devicedetails.h

@@ -10,11 +10,13 @@ struct gas {
 	unsigned char helium;
 	unsigned char type;
 	unsigned char depth;
+	gas(unsigned char oxygen = 0, unsigned char helium = 0, unsigned char type = 0, unsigned char depth = 0);
 };
 
 struct setpoint {
 	unsigned char sp;
 	unsigned char depth;
+	setpoint(unsigned char sp = 0, unsigned char depth = 0);
 };
 
 class DeviceDetails : public QObject