1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_ENVIRONMENT_H_
#define BASE_ENVIRONMENT_H_
#include <map>
#include <memory>
#include <optional>
#include <string>
#include "base/base_export.h"
#include "base/strings/cstring_view.h"
#include "build/build_config.h"
namespace base {
namespace env_vars {
#if BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
// On Posix systems, this variable contains the location of the user's home
// directory. (e.g, /home/username/).
inline constexpr char kHome[] = "HOME";
#endif
} // namespace env_vars
class BASE_EXPORT Environment {
public:
virtual ~Environment();
// Returns the appropriate platform-specific instance.
static std::unique_ptr<Environment> Create();
// Returns an environment variable's value.
// Returns std::nullopt if the key is unset.
// Note that the variable may be set to an empty string.
virtual std::optional<std::string> GetVar(cstring_view variable_name) = 0;
// Syntactic sugar for GetVar(variable_name).has_value();
bool HasVar(cstring_view variable_name);
// Returns true on success, otherwise returns false. This method should not
// be called in a multi-threaded process.
virtual bool SetVar(cstring_view variable_name,
const std::string& new_value) = 0;
// Returns true on success, otherwise returns false. This method should not
// be called in a multi-threaded process.
virtual bool UnSetVar(cstring_view variable_name) = 0;
};
#if BUILDFLAG(IS_WIN)
using NativeEnvironmentString = std::wstring;
#elif BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA)
using NativeEnvironmentString = std::string;
#endif
using EnvironmentMap =
std::map<NativeEnvironmentString, NativeEnvironmentString>;
} // namespace base
#endif // BASE_ENVIRONMENT_H_
|
