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