C++系统相关操作2 - 获取系统环境变量

#pragma once

#include <cstdint>
#include <string>

namespace cutl
{
    /**
     * @brief Get an environment variable.
     *
     * @param name the name of the environment variable.
     * @param default_value the default value if the variable is not found.
     * @return std::string the value of the environment variable.
     */
    std::string getenv(const std::string &name, const std::string &default_value);
} // namespace cutl

#include <map>
#include <iostream>
#include <strutil.h>
#include <cstdlib>
#include "sysutil.h"
#include "inner/logger.h"
#include "inner/system_util.h"
#include "inner/filesystem.h"

namespace cutl
{
    std::string getenv(const std::string &name, const std::string &default_value)
    {
        const char *text = std::getenv(name.c_str());
        if (text == nullptr)
        {
            CUTL_ERROR("variable [" + name + "] not set, fallback to " + default_value);
            return default_value;
        }

        return std::string(text);
    }
} // namespace cutl

#include "common.hpp"
#include "sysutil.h"

void TestGetEnv()
{
    PrintSubTitle("TestGetEnv");

    auto result = cutl::getenv("PATH", "not found");
    std::cout << "getenv for PATH, result:" << std::endl
              << result << std::endl;

    // for Windows testing
    std::cout << "USERPROFILE: " << cutl::getenv("USERPROFILE", "not found") << std::endl;
    std::cout << "PROCESSOR_ARCHITECTURE: " << cutl::getenv("PROCESSOR_ARCHITECTURE", "not found") << std::endl;
    // FOR UNIX/LINUX/MAC testing
    std::cout << "HOME: " << cutl::getenv("HOME", "not found") << std::endl;
}