linux ini c++

[section1]
key1=value1
key2=value2

[section2]
keyA=valueA
keyB=valueB

#include <iostream>
#include <fstream>
#include <sstream>
#include <map>
#include <string>

std::map<std::string, std::map<std::string, std::string>> readIniFile(const std::string& filename) {
    std::map<std::string, std::map<std::string, std::string>> iniData;
    std::ifstream file(filename);
    std::string line;
    std::string currentSection;

    while (std::getline(file, line)) {
        // Trim leading and trailing whitespace
        line.erase(0, line.find_first_not_of(" \t\r\n"));
        line.erase(line.find_last_not_of(" \t\r\n") + 1);

        if (line.empty() || line[0] == ';') continue; // Skip empty lines and comments

        if (line[0] == '[' && line.back() == ']') {
            currentSection = line.substr(1, line.size() - 2);
        } else {
            size_t equalsPos = line.find('=');
            if (equalsPos != std::string::npos) {
                std::string key = line.substr(0, equalsPos);
                std::string value = line.substr(equalsPos + 1);
                iniData[currentSection][key] = value;
            }
        }
    }

    return iniData;
}

int main() {
    auto config = readIniFile("example.ini");

    for (const auto& section : config) {
        std::cout << "[" << section.first << "]" << std::endl;
        for (const auto& keyValue : section.second) {
            std::cout << keyValue.first << " = " << keyValue.second << std::endl;
        }
    }

    return 0;
}