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// Copyright 2019 The Chromium 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 <stdlib.h>
#include <iostream>
#include <string>
namespace {
// Returns the current user username.
std::string Username() {
const char* username = getenv("USER");
return username ? std::string(username) : std::string();
}
// Writes |string| to |stream| while escaping all C escape sequences.
void EscapeString(std::ostream* stream, const std::string& string) {
for (char c : string) {
switch (c) {
case 0:
*stream << "\\0";
break;
case '\a':
*stream << "\\a";
break;
case '\b':
*stream << "\\b";
break;
case '\e':
*stream << "\\e";
break;
case '\f':
*stream << "\\f";
break;
case '\n':
*stream << "\\n";
break;
case '\r':
*stream << "\\r";
break;
case '\t':
*stream << "\\t";
break;
case '\v':
*stream << "\\v";
break;
case '\\':
*stream << "\\\\";
break;
case '\"':
*stream << "\\\"";
break;
default:
*stream << c;
break;
}
}
}
} // namespace
int main(int argc, char** argv) {
std::string username = Username();
std::cout << "{\"username\": \"";
EscapeString(&std::cout, username);
std::cout << "\"}" << std::endl;
return 0;
}
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