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| 1 // Copyright (c) 2011 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 #ifndef BASE_ENVIRONMENT_H_ | |
| 6 #define BASE_ENVIRONMENT_H_ | |
| 7 | |
| 8 #include <map> | |
| 9 #include <string> | |
| 10 | |
| 11 #include "base/base_export.h" | |
| 12 #include "base/memory/scoped_ptr.h" | |
| 13 #include "base/strings/string16.h" | |
| 14 #include "build/build_config.h" | |
| 15 | |
| 16 namespace base { | |
| 17 | |
| 18 namespace env_vars { | |
| 19 | |
| 20 #if defined(OS_POSIX) | |
| 21 BASE_EXPORT extern const char kHome[]; | |
| 22 #endif | |
| 23 | |
| 24 } // namespace env_vars | |
| 25 | |
| 26 class BASE_EXPORT Environment { | |
| 27 public: | |
| 28 virtual ~Environment(); | |
| 29 | |
| 30 // Static factory method that returns the implementation that provide the | |
| 31 // appropriate platform-specific instance. | |
| 32 static Environment* Create(); | |
| 33 | |
| 34 // Gets an environment variable's value and stores it in |result|. | |
| 35 // Returns false if the key is unset. | |
| 36 virtual bool GetVar(const char* variable_name, std::string* result) = 0; | |
| 37 | |
| 38 // Syntactic sugar for GetVar(variable_name, NULL); | |
| 39 virtual bool HasVar(const char* variable_name); | |
| 40 | |
| 41 // Returns true on success, otherwise returns false. | |
| 42 virtual bool SetVar(const char* variable_name, | |
| 43 const std::string& new_value) = 0; | |
| 44 | |
| 45 // Returns true on success, otherwise returns false. | |
| 46 virtual bool UnSetVar(const char* variable_name) = 0; | |
| 47 }; | |
| 48 | |
| 49 | |
| 50 #if defined(OS_WIN) | |
| 51 | |
| 52 typedef string16 NativeEnvironmentString; | |
| 53 typedef std::map<NativeEnvironmentString, NativeEnvironmentString> | |
| 54 EnvironmentMap; | |
| 55 | |
| 56 // Returns a modified environment vector constructed from the given environment | |
| 57 // and the list of changes given in |changes|. Each key in the environment is | |
| 58 // matched against the first element of the pairs. In the event of a match, the | |
| 59 // value is replaced by the second of the pair, unless the second is empty, in | |
| 60 // which case the key-value is removed. | |
| 61 // | |
| 62 // This Windows version takes and returns a Windows-style environment block | |
| 63 // which is a concatenated list of null-terminated 16-bit strings. The end is | |
| 64 // marked by a double-null terminator. The size of the returned string will | |
| 65 // include the terminators. | |
| 66 BASE_EXPORT string16 AlterEnvironment(const wchar_t* env, | |
| 67 const EnvironmentMap& changes); | |
| 68 | |
| 69 #elif defined(OS_POSIX) | |
| 70 | |
| 71 typedef std::string NativeEnvironmentString; | |
| 72 typedef std::map<NativeEnvironmentString, NativeEnvironmentString> | |
| 73 EnvironmentMap; | |
| 74 | |
| 75 // See general comments for the Windows version above. | |
| 76 // | |
| 77 // This Posix version takes and returns a Posix-style environment block, which | |
| 78 // is a null-terminated list of pointers to null-terminated strings. The | |
| 79 // returned array will have appended to it the storage for the array itself so | |
| 80 // there is only one pointer to manage, but this means that you can't copy the | |
| 81 // array without keeping the original around. | |
| 82 BASE_EXPORT scoped_ptr<char*[]> AlterEnvironment( | |
| 83 const char* const* env, | |
| 84 const EnvironmentMap& changes); | |
| 85 | |
| 86 #endif | |
| 87 | |
| 88 } // namespace base | |
| 89 | |
| 90 #endif // BASE_ENVIRONMENT_H_ | |
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