Version 2 of WinFetch

There was a version 1 (it was never on GitHub).
There is a v2.0.0 binary here.

Here is the code v1.0.0:

// winfetch.cpp : This file contains the 'main' function. Program execution begins and ends there.s  

#include <cassert>
#include <iomanip>
#include <iostream>
#include <vector>
#include <string>
#include <Windows.h>
#include <stdlib.h>
#pragma comment(lib, "version.lib")

using namespace std;

// Required for RtlGetVersion()
#pragma comment(lib, "ntdll.lib")

string getEnvVar(const char* name) {
	char* pValue;
	size_t len;
	errno_t err = _dupenv_s(&pValue, &len, name);
	if (err) return "Error Getting variable - " + string(name);
	return string(pValue);
}

extern "C" {
	typedef LONG NTSTATUS, * PNTSTATUS;
#define STATUS_SUCCESS (0x00000000)

	// Windows 2000 and newer
	NTSYSAPI NTSTATUS NTAPI RtlGetVersion(PRTL_OSVERSIONINFOEXW lpVersionInformation);
}

RTL_OSVERSIONINFOEXW getWindowsOSinformation() {
	RTL_OSVERSIONINFOEXW osVers;
	osVers.dwOSVersionInfoSize = sizeof(osVers);

	// fill the structure with version details
	NTSTATUS status = RtlGetVersion(&osVers);

	// this should always succeed
	assert(status == STATUS_SUCCESS);

	return osVers;
}

string getWindowsVersionString() {
	RTL_OSVERSIONINFOEXW osVers = getWindowsOSinformation();

	if (osVers.dwMajorVersion == 6) {
		if (osVers.dwMinorVersion == 0) {
			return "Windows Vista";
		} else if (osVers.dwMinorVersion == 1) {
			return "Windows 7";
		} else if (osVers.dwMinorVersion == 2) {
			return "Windows 8";
		} else if (osVers.dwMinorVersion == 3) {
			return "Windows 8.1";
		} else {
			return "There was a problem evaluating the Windows version";
		}
	} if (osVers.dwMajorVersion == 10) {
		if (osVers.dwBuildNumber >= 22000) {
			return "Windows 11";
		} else if (osVers.dwBuildNumber >= 21327) { // Earliest known Win11 Build
			return "Pre Dev-Channel Windows 11";
		} else {
			return "Windows 10";
		}
	}
	else {
		return "Windows XP or earlier";
	}
}

namespace SystemInformation {
	void windowsVersion() {
		string windowsVersionString = getWindowsVersionString();
		RTL_OSVERSIONINFOEXW osVers = getWindowsOSinformation();
		if (windowsVersionString == "Windows XP or earlier") {
			cout << "Windows Version: " << 
				getWindowsVersionString() << 
				". Build is " <<
				osVers.dwMajorVersion << "." <<
				osVers.dwMinorVersion << "." <<
				osVers.dwBuildNumber <<
				endl;
		}
		else {
			cout << "Windows Version: " << 
				getWindowsVersionString() << 
				endl;
		}
	}
	void hardwareInformation() {
		SYSTEM_INFO siSysInfo;

		// Copy the hardware information to the SYSTEM_INFO structure. 

		GetSystemInfo(&siSysInfo);

		// Display the contents of the SYSTEM_INFO structure. 

		cout << "Hardware information:" << endl;
		cout << "  OEM ID: "  << siSysInfo.dwOemId << endl;
		cout << "  Number of processors: " << siSysInfo.dwNumberOfProcessors << endl;
		cout << "  Page size: " << siSysInfo.dwPageSize << endl;
		cout << "  Processor type: " << siSysInfo.dwProcessorType << endl;
		cout << "  Minimum application address: " << siSysInfo.lpMinimumApplicationAddress << endl;
		cout << "  Maximum application address: " << siSysInfo.lpMaximumApplicationAddress << endl;
		cout << "  Active processor mask: " << siSysInfo.dwActiveProcessorMask << endl;
	}
	void systemInformation() {
		string data;
		cout << "System information:" << endl;

		data = getEnvVar("username");
		cout << "  Username: " << data << endl;

		data = getEnvVar("windir");
		cout << "  Windows Directory: " << data << endl;

		data = getEnvVar("path");
		cout << "  Path: " << data << endl;

		data = getEnvVar("computername");
		cout << "  Computer Name: " << data << endl;
	}
}

int main() {
	SystemInformation::windowsVersion();
	SystemInformation::hardwareInformation();
	SystemInformation::systemInformation();
	return 0;
}