xref: /third_party/gn/examples/ios/host/main.cc (revision 6d528ed9) 
1// Copyright 2019 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include <stdlib.h>
6#include <iostream>
7#include <string>
8
9namespace {
10
11// Returns the current user username.
12std::string Username() {
13  const char* username = getenv("USER");
14  return username ? std::string(username) : std::string();
15}
16
17// Writes |string| to |stream| while escaping all C escape sequences.
18void EscapeString(std::ostream* stream, const std::string& string) {
19  for (char c : string) {
20    switch (c) {
21      case 0:
22        *stream << "\\0";
23        break;
24      case '\a':
25        *stream << "\\a";
26        break;
27      case '\b':
28        *stream << "\\b";
29        break;
30      case '\e':
31        *stream << "\\e";
32        break;
33      case '\f':
34        *stream << "\\f";
35        break;
36      case '\n':
37        *stream << "\\n";
38        break;
39      case '\r':
40        *stream << "\\r";
41        break;
42      case '\t':
43        *stream << "\\t";
44        break;
45      case '\v':
46        *stream << "\\v";
47        break;
48      case '\\':
49        *stream << "\\\\";
50        break;
51      case '\"':
52        *stream << "\\\"";
53        break;
54      default:
55        *stream << c;
56        break;
57    }
58  }
59}
60
61}  // namespace
62
63int main(int argc, char** argv) {
64  std::string username = Username();
65
66  std::cout << "{\"username\": \"";
67  EscapeString(&std::cout, username);
68  std::cout << "\"}" << std::endl;
69
70  return 0;
71}
72