123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990 |
- // Copyright (c) 2011 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.
- #ifndef BUTIL_ENVIRONMENT_H_
- #define BUTIL_ENVIRONMENT_H_
- #include <map>
- #include <string>
- #include "butil/base_export.h"
- #include "butil/memory/scoped_ptr.h"
- #include "butil/strings/string16.h"
- #include "butil/build_config.h"
- namespace butil {
- namespace env_vars {
- #if defined(OS_POSIX)
- BUTIL_EXPORT extern const char kHome[];
- #endif
- } // namespace env_vars
- class BUTIL_EXPORT Environment {
- public:
- virtual ~Environment();
- // Static factory method that returns the implementation that provide the
- // appropriate platform-specific instance.
- static Environment* Create();
- // Gets an environment variable's value and stores it in |result|.
- // Returns false if the key is unset.
- virtual bool GetVar(const char* variable_name, std::string* result) = 0;
- // Syntactic sugar for GetVar(variable_name, NULL);
- virtual bool HasVar(const char* variable_name);
- // Returns true on success, otherwise returns false.
- virtual bool SetVar(const char* variable_name,
- const std::string& new_value) = 0;
- // Returns true on success, otherwise returns false.
- virtual bool UnSetVar(const char* variable_name) = 0;
- };
- #if defined(OS_WIN)
- typedef string16 NativeEnvironmentString;
- typedef std::map<NativeEnvironmentString, NativeEnvironmentString>
- EnvironmentMap;
- // 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 concatenated list of null-terminated 16-bit strings. The end is
- // marked by a double-null terminator. The size of the returned string will
- // include the terminators.
- BUTIL_EXPORT string16 AlterEnvironment(const wchar_t* env,
- const EnvironmentMap& changes);
- #elif defined(OS_POSIX)
- typedef std::string NativeEnvironmentString;
- typedef std::map<NativeEnvironmentString, NativeEnvironmentString>
- EnvironmentMap;
- // See general comments for the Windows version above.
- //
- // 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.
- BUTIL_EXPORT scoped_ptr<char*[]> AlterEnvironment(
- const char* const* env,
- const EnvironmentMap& changes);
- #endif
- } // namespace butil
- #endif // BUTIL_ENVIRONMENT_H_
|