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 <__config> 10 #ifndef _LIBCPP_HAS_NO_FILESYSTEM 11 # include <fstream> 12 #endif 13 #include <ostream> 14 15 #include "std_stream.h" 16 17 _LIBCPP_BEGIN_NAMESPACE_STD 18 19 _LIBCPP_EXPORTED_FROM_ABI FILE* __get_ostream_file(ostream& __os) { 20 // dynamic_cast requires RTTI, this only affects users whose vendor builds 21 // the dylib with RTTI disabled. It does not affect users who build with RTTI 22 // disabled but use a dylib where the RTTI is enabled. 23 // 24 // Returning a nullptr means the stream is not considered a terminal and the 25 // special terminal handling is not done. The terminal handling is mainly of 26 // importance on Windows. 27 #ifndef _LIBCPP_HAS_NO_RTTI 28 auto* __rdbuf = __os.rdbuf(); 29 # ifndef _LIBCPP_HAS_NO_FILESYSTEM 30 if (auto* __buffer = dynamic_cast<filebuf*>(__rdbuf)) 31 return __buffer->__file_; 32 # endif 33 34 if (auto* __buffer = dynamic_cast<__stdoutbuf<char>*>(__rdbuf)) 35 return __buffer->__file_; 36 #endif // _LIBCPP_HAS_NO_RTTI 37 38 return nullptr; 39 } 40 41 _LIBCPP_END_NAMESPACE_STD 42