environment_internal.h

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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.

// This file contains internal routines that are called by other files in

// base/process/.

#ifndef BASE_PROCESS_ENVIRONMENT_INTERNAL_H_

#define BASE_PROCESS_ENVIRONMENT_INTERNAL_H_

#include <memory>

#include "base/environment.h"

#include "build/build_config.h"

namespace base {

namespace internal {

#if defined(OS_POSIX) || defined(OS_FUCHSIA)

// Returns a modified environment vector constructed from the given environment

// and the list of changes given in |changes|. Each key in the environment is

// matched against the first element of the pairs. In the event of a match, the

// value is replaced by the second of the pair, unless the second is empty, in

// which case the key-value is removed.

//

// This POSIX version takes and returns a POSIX-style environment block, which

// is a null-terminated list of pointers to null-terminated strings. The

// returned array will have appended to it the storage for the array itself so

// there is only one pointer to manage, but this means that you can't copy the

// array without keeping the original around.

BASE_EXPORT std::unique_ptr<char*[]> AlterEnvironment(

    const char* const* env,

    const EnvironmentMap& changes);

#elif defined(OS_WIN)

// Returns a modified environment vector constructed from the given environment

// and the list of changes given in |changes|. Each key in the environment is

// matched against the first element of the pairs. In the event of a match, the

// value is replaced by the second of the pair, unless the second is empty, in

// which case the key-value is removed.

//

// This Windows version takes and returns a Windows-style environment block,

// which is a string containing several null-terminated strings followed by an

// extra terminating null character. So, e.g., the environment A=1 B=2 is

// represented as L"A=1\0B=2\0\0".

BASE_EXPORT NativeEnvironmentString

AlterEnvironment(const wchar_t* env, const EnvironmentMap& changes);

#endif  // OS_*

}  // namespace internal

}  // namespace base

#endif  // BASE_PROCESS_ENVIRONMENT_INTERNAL_H_