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