blob: 37b98fae47f634a6c1382d85b3cf6daf6873ceb4 [file] [log] [blame]
// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "flutter/shell/platform/common/engine_switches.h"
#include <algorithm>
#include <cstdlib>
#include <iostream>
#include <sstream>
namespace flutter {
std::vector<std::string> GetSwitchesFromEnvironment() {
std::vector<std::string> switches;
// Read engine switches from the environment in debug/profile. If release mode
// support is needed in the future, it should likely use a whitelist.
#ifndef FLUTTER_RELEASE
const char* switch_count_key = "FLUTTER_ENGINE_SWITCHES";
const int kMaxSwitchCount = 50;
const char* switch_count_string = std::getenv(switch_count_key);
if (!switch_count_string) {
return switches;
}
int switch_count = std::min(kMaxSwitchCount, atoi(switch_count_string));
for (int i = 1; i <= switch_count; ++i) {
std::ostringstream switch_key;
switch_key << "FLUTTER_ENGINE_SWITCH_" << i;
const char* switch_value = std::getenv(switch_key.str().c_str());
if (switch_value) {
std::ostringstream switch_value_as_flag;
switch_value_as_flag << "--" << switch_value;
switches.push_back(switch_value_as_flag.str());
} else {
std::cerr << switch_count << " keys expected from " << switch_count_key
<< ", but " << switch_key.str() << " is missing." << std::endl;
}
}
#endif // !FLUTTER_RELEASE
return switches;
}
} // namespace flutter