1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include <__availability> 10 #include <__config> 11 #ifndef _LIBCPP_HAS_NO_FILESYSTEM 12 # include <fstream> 13 #endif 14 #include <ostream> 15 16 #include "std_stream.h" 17 18 _LIBCPP_BEGIN_NAMESPACE_STD 19 20 _LIBCPP_EXPORTED_FROM_ABI FILE* __get_ostream_file(ostream& __os) { 21 // dynamic_cast requires RTTI, this only affects users whose vendor builds 22 // the dylib with RTTI disabled. It does not affect users who build with RTTI 23 // disabled but use a dylib where the RTTI is enabled. 24 // 25 // Returning a nullptr means the stream is not considered a terminal and the 26 // special terminal handling is not done. The terminal handling is mainly of 27 // importance on Windows. 28 #ifndef _LIBCPP_HAS_NO_RTTI 29 auto* __rdbuf = __os.rdbuf(); 30 # ifndef _LIBCPP_HAS_NO_FILESYSTEM 31 if (auto* __buffer = dynamic_cast<filebuf*>(__rdbuf)) 32 return __buffer->__file_; 33 # endif 34 35 if (auto* __buffer = dynamic_cast<__stdoutbuf<char>*>(__rdbuf)) 36 return __buffer->__file_; 37 #endif // _LIBCPP_HAS_NO_RTTI 38 39 return nullptr; 40 } 41 42 _LIBCPP_END_NAMESPACE_STD 43