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/*
* Copyright (C) 2018 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
/**
* \file platform\win32\Environment.cpp
* \brief Implements CEnvironment win32 specified class functions.
*/
#include "platform/Environment.h"
#include "platform/win32/CharsetConverter.h"
#include <stdlib.h>
#include <Windows.h>
// --------------------- Internal Function ---------------------
/**
* \fn int CEnvironment::win32_setenv(const std::wstring &name, const std::wstring &value = L"",
* updateAction action = autoDetect)
* \brief Internal function used to manipulate environment variables on win32.
*
* This function make all dirty work with setting, deleting and modifying environment variables.
*
* \param name The environment variable name.
* \param value (optional) the new value of environment variable.
* \param action (optional) the action.
* \return Zero on success, 2 if at least one external runtime update failed, 4 if process
* environment update failed, 8 if our runtime environment update failed or, in case of
* several errors, sum of all errors values; non-zero in case of other errors.
*/
int CEnvironment::win_setenv(const std::string &name, const std::string &value /* = "" */, enum updateAction action /* = autoDetect */)
{
std::wstring Wname = KODI::PLATFORM::WINDOWS::ToW(name);
if (Wname.empty() || name.find('=') != std::wstring::npos)
return -1;
if ( (action == addOnly || action == addOrUpdateOnly) && value.empty() )
return -1;
if (action == addOnly && !getenv(name).empty() )
return 0;
std::wstring Wvalue = KODI::PLATFORM::WINDOWS::ToW(value);
int retValue = 0;
std::wstring EnvString;
if (action == deleteVariable)
EnvString = Wname + L"=";
else
EnvString = Wname + L"=" + Wvalue;
#ifdef _DEBUG
// Most dependencies are built in release and use non-debug runtime libs,
// and so we have to sync environment vars for these during debug because
// they don't share environments between themselves
typedef int(_cdecl * wputenvPtr) (const wchar_t *envstring);
static const wchar_t *modulesList[] =
{
{ L"vcruntime140.dll" },
{ L"ucrtbase.dll" },
{ nullptr } // Terminating NULL for list
};
// Check all modules each function run, because modules can be loaded/unloaded at runtime
for (int i = 0; modulesList[i]; i++)
{
HMODULE hModule;
if (!GetModuleHandleExW(0, modulesList[i], &hModule) || hModule == nullptr) // Flag 0 ensures that module will be kept loaded until it'll be freed
continue; // Module not loaded
wputenvPtr wputenvFunc = (wputenvPtr)GetProcAddress(hModule, "_wputenv");
if (wputenvFunc != nullptr && wputenvFunc(EnvString.c_str()) != 0)
retValue |= 2; // At lest one external runtime library Environment update failed
FreeLibrary(hModule);
}
#endif
// Update process Environment used for current process and for future new child processes
if (action == deleteVariable || value.empty())
retValue += SetEnvironmentVariableW(Wname.c_str(), nullptr) ? 0 : 4; // 4 if failed
else
retValue += SetEnvironmentVariableW(Wname.c_str(), Wvalue.c_str()) ? 0 : 4; // 4 if failed
// Finally update our runtime Environment
retValue += (::_wputenv(EnvString.c_str()) == 0) ? 0 : 8; // 8 if failed
return retValue;
}
std::string CEnvironment::win_getenv(const std::string &name)
{
std::wstring Wname = KODI::PLATFORM::WINDOWS::ToW(name);
if (Wname.empty())
return "";
wchar_t * wStr = ::_wgetenv(Wname.c_str());
if (wStr != nullptr)
return KODI::PLATFORM::WINDOWS::FromW(wStr);
// Not found in Environment of runtime library
// Try Environment of process as fallback
unsigned int varSize = GetEnvironmentVariableW(Wname.c_str(), nullptr, 0);
if (varSize == 0)
return ""; // Not found
wchar_t * valBuf = new wchar_t[varSize];
if (GetEnvironmentVariableW(Wname.c_str(), valBuf, varSize) != varSize-1)
{
delete[] valBuf;
return "";
}
std::wstring Wvalue (valBuf);
delete[] valBuf;
return KODI::PLATFORM::WINDOWS::FromW(Wvalue);
}
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