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// Copyright (c) 2016 Klemens D. Morgenstern
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_PROCESS_DETAIL_POSIX_ENVIRONMENT_HPP_
#define BOOST_PROCESS_DETAIL_POSIX_ENVIRONMENT_HPP_
#include <string>
#include <vector>
#include <unordered_map>
#include <boost/process/detail/config.hpp>
#include <algorithm>
#include <cstdlib>
#include <boost/process/locale.hpp>
namespace boost { namespace process { namespace detail { namespace posix {
template<typename Char>
class native_environment_impl
{
static std::vector<std::basic_string<Char>> _load()
{
std::vector<std::basic_string<Char>> val;
auto p = environ;
while (*p != nullptr)
{
std::string str = *p;
val.push_back(::boost::process::detail::convert(str));
p++;
}
return val;
}
static std::vector<Char*> _load_var(std::vector<std::basic_string<Char>> & vec)
{
std::vector<Char*> val;
val.resize(vec.size() + 1);
std::transform(vec.begin(), vec.end(), val.begin(),
[](std::basic_string<Char> & str)
{
return &str.front();
});
val.back() = nullptr;
return val;
}
std::vector<std::basic_string<Char>> _buffer = _load();
std::vector<Char*> _impl = _load_var(_buffer);
public:
using char_type = Char;
using pointer_type = const char_type*;
using string_type = std::basic_string<char_type>;
using native_handle_type = char_type **;
void reload()
{
_buffer = _load();
_impl = _load_var(_buffer);
}
string_type get(const pointer_type id) { return get(string_type(id)); }
void set(const pointer_type id, const pointer_type value)
{
set(string_type(id), string_type(value));
}
void reset(const pointer_type id) { reset(string_type(id)); }
string_type get(const string_type & id)
{
std::string id_c = ::boost::process::detail::convert(id);
std::string g = ::getenv(id_c.c_str());
return ::boost::process::detail::convert(g.c_str());
}
void set(const string_type & id, const string_type & value)
{
std::string id_c = ::boost::process::detail::convert(id.c_str());
std::string value_c = ::boost::process::detail::convert(value.c_str());
auto res = ::setenv(id_c.c_str(), value_c.c_str(), true);
if (res != 0)
boost::process::detail::throw_last_error();
}
void reset(const string_type & id)
{
std::string id_c = ::boost::process::detail::convert(id.c_str());
auto res = ::unsetenv(id_c.c_str());
if (res != 0)
::boost::process::detail::throw_last_error();
}
native_environment_impl() = default;
native_environment_impl(const native_environment_impl& ) = delete;
native_environment_impl(native_environment_impl && ) = default;
native_environment_impl & operator=(const native_environment_impl& ) = delete;
native_environment_impl & operator=(native_environment_impl && ) = default;
native_handle_type _env_impl = _impl.data();
native_handle_type native_handle() const {return environ;}
};
template<>
class native_environment_impl<char>
{
public:
using char_type = char;
using pointer_type = const char_type*;
using string_type = std::basic_string<char_type>;
using native_handle_type = char_type **;
void reload() {this->_env_impl = ::environ;}
string_type get(const pointer_type id) { return getenv(id); }
void set(const pointer_type id, const pointer_type value)
{
auto res = ::setenv(id, value, 1);
if (res != 0)
boost::process::detail::throw_last_error();
reload();
}
void reset(const pointer_type id)
{
auto res = ::unsetenv(id);
if (res != 0)
boost::process::detail::throw_last_error();
reload();
}
string_type get(const string_type & id) {return get(id.c_str());}
void set(const string_type & id, const string_type & value) {set(id.c_str(), value.c_str()); }
void reset(const string_type & id) {reset(id.c_str());}
native_environment_impl() = default;
native_environment_impl(const native_environment_impl& ) = delete;
native_environment_impl(native_environment_impl && ) = default;
native_environment_impl & operator=(const native_environment_impl& ) = delete;
native_environment_impl & operator=(native_environment_impl && ) = default;
native_handle_type _env_impl = environ;
native_handle_type native_handle() const {return ::environ;}
};
template<typename Char>
struct basic_environment_impl
{
std::vector<std::basic_string<Char>> _data {};
static std::vector<Char*> _load_var(std::vector<std::basic_string<Char>> & data);
std::vector<Char*> _env_arr{_load_var(_data)};
public:
using char_type = Char;
using pointer_type = const char_type*;
using string_type = std::basic_string<char_type>;
using native_handle_type = Char**;
void reload()
{
_env_arr = _load_var(_data);
_env_impl = _env_arr.data();
}
string_type get(const pointer_type id) {return get(string_type(id));}
void set(const pointer_type id, const pointer_type value) {set(string_type(id), value);}
void reset(const pointer_type id) {reset(string_type(id));}
string_type get(const string_type & id);
void set(const string_type & id, const string_type & value);
void reset(const string_type & id);
basic_environment_impl(const native_environment_impl<Char> & nei);
basic_environment_impl() = default;
basic_environment_impl(const basic_environment_impl& rhs)
: _data(rhs._data)
{
}
basic_environment_impl(basic_environment_impl && ) = default;
basic_environment_impl & operator=(const basic_environment_impl& rhs)
{
_data = rhs._data;
_env_arr = _load_var(_data);
_env_impl = &*_env_arr.begin();
return *this;
}
basic_environment_impl & operator=(basic_environment_impl && ) = default;
template<typename CharR>
explicit inline basic_environment_impl(
const basic_environment_impl<CharR>& rhs,
const ::boost::process::codecvt_type & cv = ::boost::process::codecvt())
: _data(rhs._data.size())
{
std::transform(rhs._data.begin(), rhs._data.end(), _data.begin(),
[&](const std::basic_string<CharR> & st)
{
return ::boost::process::detail::convert(st, cv);
}
);
reload();
}
template<typename CharR>
basic_environment_impl & operator=(const basic_environment_impl<CharR>& rhs)
{
_data = ::boost::process::detail::convert(rhs._data);
_env_arr = _load_var(&*_data.begin());
_env_impl = &*_env_arr.begin();
return *this;
}
Char ** _env_impl = &*_env_arr.data();
native_handle_type native_handle() const {return &_data.front();}
};
template<typename Char>
basic_environment_impl<Char>::basic_environment_impl(const native_environment_impl<Char> & nei)
{
auto beg = nei.native_handle();
auto end = beg;
while (*end != nullptr)
end++;
this->_data.assign(beg, end);
reload();
}
template<typename Char>
inline auto basic_environment_impl<Char>::get(const string_type &id) -> string_type
{
auto itr = std::find_if(_data.begin(), _data.end(),
[&](const string_type & st)
{
if (st.size() <= id.size())
return false;
return std::equal(id.begin(), id.end(), st.begin()) && (st[id.size()] == equal_sign<Char>());
}
);
if (itr == _data.end())
{
return "";
}
else return
itr->data() + id.size(); //id=Thingy -> +2 points to T
}
template<typename Char>
inline void basic_environment_impl<Char>::set(const string_type &id, const string_type &value)
{
auto itr = std::find_if(_data.begin(), _data.end(),
[&](const string_type & st)
{
if (st.size() <= id.size())
return false;
return std::equal(id.begin(), id.end(), st.begin()) && (st[id.size()] == equal_sign<Char>());
}
);
if (itr != _data.end())
*itr = id + equal_sign<Char>() + value;
else
_data.push_back(id + equal_sign<Char>() + value);
reload();
}
template<typename Char>
inline void basic_environment_impl<Char>::reset(const string_type &id)
{
auto itr = std::find_if(_data.begin(), _data.end(),
[&](const string_type & st)
{
if (st.size() <= id.size())
return false;
return std::equal(id.begin(), id.end(), st.begin()) && (st[id.size()] == equal_sign<Char>());
}
);
if (itr != _data.end())
{
_data.erase(itr);//and remove it
}
reload();
}
template<typename Char>
std::vector<Char*> basic_environment_impl<Char>::_load_var(std::vector<std::basic_string<Char>> & data)
{
std::vector<Char*> ret;
ret.reserve(data.size() +1);
for (auto & val : data)
ret.push_back(&val.front());
ret.push_back(nullptr);
return ret;
}
template<typename T> constexpr T env_seperator();
template<> constexpr char env_seperator() {return ':'; }
template<> constexpr wchar_t env_seperator() {return L':'; }
typedef int native_handle_t;
inline int get_id() {return getpid(); }
inline int native_handle() {return getpid(); }
}
}
}
}
#endif /* BOOST_PROCESS_DETAIL_WINDOWS_ENV_STORAGE_HPP_ */
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