environment_internal.h (2229B)
1 // Copyright 2019 The Chromium Authors 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // This file contains internal routines that are called by other files in 6 // base/process/. 7 8 #ifndef BASE_PROCESS_ENVIRONMENT_INTERNAL_H_ 9 #define BASE_PROCESS_ENVIRONMENT_INTERNAL_H_ 10 11 #include <memory> 12 13 #include "base/base_export.h" 14 #include "base/environment.h" 15 #include "build/build_config.h" 16 17 namespace base { 18 namespace internal { 19 20 #if BUILDFLAG(IS_POSIX) || BUILDFLAG(IS_FUCHSIA) 21 // Returns a modified environment vector constructed from the given environment 22 // and the list of changes given in |changes|. Each key in the environment is 23 // matched against the first element of the pairs. In the event of a match, the 24 // value is replaced by the second of the pair, unless the second is empty, in 25 // which case the key-value is removed. 26 // 27 // This POSIX version takes and returns a POSIX-style environment block, which 28 // is a null-terminated list of pointers to null-terminated strings. The 29 // returned array will have appended to it the storage for the array itself so 30 // there is only one pointer to manage, but this means that you can't copy the 31 // array without keeping the original around. 32 BASE_EXPORT std::unique_ptr<char*[]> AlterEnvironment( 33 const char* const* env, 34 const EnvironmentMap& changes); 35 #elif BUILDFLAG(IS_WIN) 36 // Returns a modified environment vector constructed from the given environment 37 // and the list of changes given in |changes|. Each key in the environment is 38 // matched against the first element of the pairs. In the event of a match, the 39 // value is replaced by the second of the pair, unless the second is empty, in 40 // which case the key-value is removed. 41 // 42 // This Windows version takes and returns a Windows-style environment block, 43 // which is a string containing several null-terminated strings followed by an 44 // extra terminating null character. So, e.g., the environment A=1 B=2 is 45 // represented as L"A=1\0B=2\0\0". 46 BASE_EXPORT NativeEnvironmentString 47 AlterEnvironment(const wchar_t* env, const EnvironmentMap& changes); 48 #endif // OS_* 49 50 } // namespace internal 51 } // namespace base 52 53 #endif // BASE_PROCESS_ENVIRONMENT_INTERNAL_H_