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103 lines (85 loc) · 2.02 KB
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/**
*
* @file Get.cpp
* @author Gaspard Kirira
*
* Copyright 2025, Gaspard Kirira.
* All rights reserved.
* https://github.com/vixcpp/vix
*
* Use of this source code is governed by a MIT license
* that can be found in the License file.
*
* Vix.cpp
*/
#include <cctype>
#include <cstdlib>
#include <string>
#include <string_view>
#include <vix/env/EnvError.hpp>
#include <vix/env/Get.hpp>
namespace vix::env
{
namespace
{
[[nodiscard]] const char *get_env_raw(const char *key) noexcept
{
#if defined(_WIN32)
static thread_local std::string value;
value.clear();
char *buffer = nullptr;
std::size_t length = 0;
if (_dupenv_s(&buffer, &length, key) != 0 || buffer == nullptr)
{
return nullptr;
}
value.assign(buffer);
free(buffer);
return value.c_str();
#else
return std::getenv(key);
#endif
}
[[nodiscard]] bool is_valid_env_key(std::string_view key) noexcept
{
if (key.empty())
{
return false;
}
const unsigned char first = static_cast<unsigned char>(key.front());
if (!(std::isalpha(first) || key.front() == '_'))
{
return false;
}
for (const char c : key)
{
const unsigned char uc = static_cast<unsigned char>(c);
if (!(std::isalnum(uc) || c == '_'))
{
return false;
}
}
return true;
}
} // namespace
EnvStringResult get(std::string_view key)
{
if (key.empty())
{
return make_env_error(EnvErrorCode::EmptyKey, "environment key cannot be empty");
}
if (!is_valid_env_key(key))
{
return make_env_error(EnvErrorCode::InvalidKey, "environment key is invalid");
}
const std::string stable_key(key);
const char *value = get_env_raw(stable_key.c_str());
if (value == nullptr)
{
return make_env_error(
EnvErrorCode::NotFound,
"environment variable was not found");
}
return std::string(value);
}
} // namespace vix::env