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#include "env.h"
#include <util/generic/maybe.h>
#include <util/generic/string.h>
#include <util/generic/yexception.h>
#ifdef _win_
#include <util/generic/vector.h>
#include "winint.h"
#else
#include <cerrno>
#include <cstdlib>
#endif
/**
* On Windows there may be many copies of enviroment variables, there at least two known, one is
* manipulated by Win32 API, another by C runtime, so we must be consistent in the choice of
* functions used to manipulate them.
*
* Relevant links:
* - http://bugs.python.org/issue16633
* - https://a.yandex-team.ru/review/108892/details
*/
TMaybe<TString> TryGetEnv(const TString& key) {
#ifdef _win_
size_t len = GetEnvironmentVariableA(key.data(), nullptr, 0);
if (len == 0) {
if (GetLastError() == ERROR_ENVVAR_NOT_FOUND) {
return Nothing();
}
return TString{};
}
TVector<char> buffer(len);
size_t bufferSize;
do {
bufferSize = buffer.size();
len = GetEnvironmentVariableA(key.data(), buffer.data(), static_cast<DWORD>(bufferSize));
if (len > bufferSize) {
buffer.resize(len);
}
} while (len > bufferSize);
return TString(buffer.data(), len);
#else
const char* env = getenv(key.data());
if (!env) {
return Nothing();
}
return TString(env);
#endif
}
TString GetEnv(const TString& key, const TString& def) {
TMaybe<TString> value = TryGetEnv(key);
if (value.Defined()) {
return *std::move(value);
}
return def;
}
void SetEnv(const TString& key, const TString& value) {
bool isOk = false;
int errorCode = 0;
#ifdef _win_
isOk = SetEnvironmentVariable(key.data(), value.data());
if (!isOk) {
errorCode = GetLastError();
}
#else
isOk = (0 == setenv(key.data(), value.data(), true /*replace*/));
if (!isOk) {
errorCode = errno;
}
#endif
Y_ENSURE_EX(isOk, TSystemError() << "failed to SetEnv with error-code " << errorCode);
}
void UnsetEnv(const TString& key) {
bool notFound = false;
#ifdef _win_
bool ok = SetEnvironmentVariable(key.c_str(), NULL);
notFound = !ok && (GetLastError() == ERROR_ENVVAR_NOT_FOUND);
#else
bool ok = (0 == unsetenv(key.c_str()));
#if defined(_darwin_)
notFound = !ok && (errno == EINVAL);
#endif
#endif
Y_ENSURE_EX(ok || notFound, TSystemError() << "failed to unset environment variable " << key.Quote());
}
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