EnvironmentMap.h (2328B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ 2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */ 3 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 4 // Use of this source code is governed by a BSD-style license that can be 5 // found in the LICENSE file. 6 7 #ifndef SANDBOXING_COMMON_ENVIRONMENTMAP_H_ 8 #define SANDBOXING_COMMON_ENVIRONMENTMAP_H_ 9 10 #include <map> 11 #include <memory> 12 #include <string> 13 14 namespace base { 15 16 #if defined(XP_WIN) 17 18 typedef std::wstring NativeEnvironmentString; 19 typedef std::map<NativeEnvironmentString, NativeEnvironmentString> 20 EnvironmentMap; 21 22 # define ENVIRONMENT_LITERAL(x) L##x 23 # define ENVIRONMENT_STRING(x) \ 24 ((std::wstring)(NS_ConvertUTF8toUTF16((x)).get())) 25 26 // Returns a modified environment vector constructed from the given environment 27 // and the list of changes given in |changes|. Each key in the environment is 28 // matched against the first element of the pairs. In the event of a match, the 29 // value is replaced by the second of the pair, unless the second is empty, in 30 // which case the key-value is removed. 31 // 32 // This Windows version takes and returns a Windows-style environment block 33 // which is a concatenated list of null-terminated 16-bit strings. The end is 34 // marked by a double-null terminator. The size of the returned string will 35 // include the terminators. 36 NativeEnvironmentString AlterEnvironment(const wchar_t* env, 37 const EnvironmentMap& changes); 38 39 #else 40 41 typedef std::string NativeEnvironmentString; 42 typedef std::map<NativeEnvironmentString, NativeEnvironmentString> 43 EnvironmentMap; 44 45 # define ENVIRONMENT_LITERAL(x) x 46 # define ENVIRONMENT_STRING(x) x 47 48 // See general comments for the Windows version above. 49 // 50 // This Posix version takes and returns a Posix-style environment block, which 51 // is a null-terminated list of pointers to null-terminated strings. The 52 // returned array will have appended to it the storage for the array itself so 53 // there is only one pointer to manage, but this means that you can't copy the 54 // array without keeping the original around. 55 std::unique_ptr<char*[]> AlterEnvironment(const char* const* env, 56 const EnvironmentMap& changes); 57 58 #endif 59 60 } // namespace base 61 62 #endif // SANDBOXING_COMMON_ENVIRONMENTMAP_H_