fix: Preventing division through 0 errors

Dockerfile

@@ -2,4 +2,7 @@ FROM archlinux:latest
 RUN pacman --noconfirm -Sy gcc make
 COPY . .
 RUN make
+RUN pacman --noconfirm -Rnsu gcc make
+RUN useradd batstat
+USER batstat
 CMD [ "build/batstat" ]

include/batteryinfo.h

@@ -12,10 +12,12 @@ namespace dlore
 		std::string Technology;
 		unsigned int CellSeriesCount;
 		unsigned int Capacity;
+		unsigned int CapacityDesign;
 		float Vnow;
 		float Vmin;
 		unsigned int ChargeNow;
 		unsigned int ChargeFull;
+		unsigned int ChargeFullPercentageDesign;
 		unsigned int ChargeFullDesign;
 	} typedef BatteryInfo;
 

src/batteryinfo.cc

@@ -7,7 +7,7 @@ namespace dlore
 	std::string readData(std::filesystem::path path)
 	{
 		std::ifstream file(path, std::ios::in);
-		if(!file) return "";
+		if(!file) return "0";
 		std::string ret;
 		std::getline(file, ret);
 		file.close();
@@ -26,6 +26,11 @@ namespace dlore
 		info.ChargeFull = std::stoi(readData(classPath / "charge_full")) / 1000;
 		info.ChargeFullDesign = std::stoi(readData(classPath / "charge_full_design")) / 1000;
 
+		if(info.ChargeFullDesign != 0) {
+			info.ChargeFullPercentageDesign = 100 * info.ChargeFull / info.ChargeFullDesign;
+			info.CapacityDesign = 100 * info.ChargeNow / info.ChargeFullDesign;
+		}
+
 		int Vnow = std::stoi(readData(classPath / "voltage_now")) / 1000;
 		int Vmin = std::stoi(readData(classPath / "voltage_min_design")) / 1000;
 

src/main.cc

@@ -16,12 +16,13 @@ void printBattery(std::filesystem::path classPath)
 	std::cout << std::endl << "\tTechnology:           " << bat.Technology;
 	std::cout << std::endl << "\tCell series count:    " << bat.CellSeriesCount << 's' << std::endl;
 	std::cout << std::endl << "\tCapacity:             " << bat.Capacity << '%';
+	std::cout << std::endl << "\tCapacity (design):    " << bat.CapacityDesign << '%';
 	std::cout << std::endl << "\tVmin:                 " << bat.Vmin << 'V';
 	std::cout << "  Per cell: " << bat.Vmin / bat.CellSeriesCount << 'V';
 	std::cout << std::endl << "\tVnow:                 " << bat.Vnow << 'V';
 	std::cout << "  Per cell: " << bat.Vnow / bat.CellSeriesCount << 'V';
 	std::cout << std::endl << "\tCharge now:           " << bat.ChargeNow << "mAh";
-	std::cout << std::endl << "\tCharge full:          " << bat.ChargeFull << "mAh";
+	std::cout << std::endl << "\tCharge full:          " << bat.ChargeFull << "mAh (" << bat.ChargeFullPercentageDesign << "% of design)";
 	std::cout << std::endl << "\tCharge full (design): " << bat.ChargeFullDesign << "mAh" << std::endl;
 }