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91 lines
2.9 KiB
C++
91 lines
2.9 KiB
C++
// Copyright (c) 2011 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef BASE_ENVIRONMENT_H_
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#define BASE_ENVIRONMENT_H_
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#include <map>
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#include <memory>
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#include <string>
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#include "base/base_export.h"
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#include "base/strings/string16.h"
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#include "base/strings/string_piece.h"
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#include "build/build_config.h"
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namespace base {
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namespace env_vars {
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#if defined(OS_POSIX) || defined(OS_FUCHSIA)
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BASE_EXPORT extern const char kHome[];
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#endif
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} // namespace env_vars
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class BASE_EXPORT Environment {
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public:
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virtual ~Environment();
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// Returns the appropriate platform-specific instance.
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static std::unique_ptr<Environment> Create();
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// Gets an environment variable's value and stores it in |result|.
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// Returns false if the key is unset.
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virtual bool GetVar(StringPiece variable_name, std::string* result) = 0;
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// Syntactic sugar for GetVar(variable_name, nullptr);
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virtual bool HasVar(StringPiece variable_name);
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// Returns true on success, otherwise returns false.
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virtual bool SetVar(StringPiece variable_name,
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const std::string& new_value) = 0;
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// Returns true on success, otherwise returns false.
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virtual bool UnSetVar(StringPiece variable_name) = 0;
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};
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#if defined(OS_WIN)
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typedef string16 NativeEnvironmentString;
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typedef std::map<NativeEnvironmentString, NativeEnvironmentString>
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EnvironmentMap;
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// Returns a modified environment vector constructed from the given environment
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// and the list of changes given in |changes|. Each key in the environment is
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// matched against the first element of the pairs. In the event of a match, the
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// value is replaced by the second of the pair, unless the second is empty, in
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// which case the key-value is removed.
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//
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// This Windows version takes and returns a Windows-style environment block
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// which is a concatenated list of null-terminated 16-bit strings. The end is
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// marked by a double-null terminator. The size of the returned string will
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// include the terminators.
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BASE_EXPORT string16 AlterEnvironment(const wchar_t* env,
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const EnvironmentMap& changes);
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#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
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typedef std::string NativeEnvironmentString;
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typedef std::map<NativeEnvironmentString, NativeEnvironmentString>
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EnvironmentMap;
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// See general comments for the Windows version above.
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//
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// This Posix version takes and returns a Posix-style environment block, which
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// is a null-terminated list of pointers to null-terminated strings. The
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// returned array will have appended to it the storage for the array itself so
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// there is only one pointer to manage, but this means that you can't copy the
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// array without keeping the original around.
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BASE_EXPORT std::unique_ptr<char* []> AlterEnvironment(
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const char* const* env,
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const EnvironmentMap& changes);
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#endif
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} // namespace base
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#endif // BASE_ENVIRONMENT_H_
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