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Copy pathUnset.cpp
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88 lines (75 loc) · 1.76 KB
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/**
*
* @file Unset.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/Unset.hpp>
namespace vix::env
{
namespace
{
[[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
vix::error::Error unset(std::string_view key) noexcept
{
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);
#if defined(_WIN32)
if (_putenv_s(stable_key.c_str(), "") != 0)
{
return make_env_error(
EnvErrorCode::UnsupportedOperation,
"failed to unset environment variable");
}
#else
if (::unsetenv(stable_key.c_str()) != 0)
{
return make_env_error(
EnvErrorCode::UnsupportedOperation,
"failed to unset environment variable");
}
#endif
return {};
}
} // namespace vix::env