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67 lines
2.1 KiB
67 lines
2.1 KiB
2017-07-18 Jonathan Wakely <jwakely@redhat.com> |
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PR libstdc++/81395 |
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* include/bits/fstream.tcc (basic_filebuf::xsgetn): Don't set buffer |
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pointers for write mode after reading. |
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* testsuite/27_io/basic_filebuf/sgetn/char/81395.cc: New. |
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--- libstdc++-v3/include/bits/fstream.tcc (revision 254017) |
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+++ libstdc++-v3/include/bits/fstream.tcc (revision 254018) |
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@@ -699,7 +699,7 @@ |
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if (__n == 0) |
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{ |
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- _M_set_buffer(0); |
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+ // Set _M_reading. Buffer is already in initial 'read' mode. |
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_M_reading = true; |
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} |
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else if (__len == 0) |
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--- libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/81395.cc (nonexistent) |
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+++ libstdc++-v3/testsuite/27_io/basic_filebuf/sgetn/char/81395.cc (revision 254018) |
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@@ -0,0 +1,46 @@ |
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+// Copyright (C) 2017 Free Software Foundation, Inc. |
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+// |
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+// This file is part of the GNU ISO C++ Library. This library is free |
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+// software; you can redistribute it and/or modify it under the |
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+// terms of the GNU General Public License as published by the |
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+// Free Software Foundation; either version 3, or (at your option) |
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+// any later version. |
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+ |
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+// This library is distributed in the hope that it will be useful, |
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+// but WITHOUT ANY WARRANTY; without even the implied warranty of |
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+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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+// GNU General Public License for more details. |
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+ |
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+// You should have received a copy of the GNU General Public License along |
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+// with this library; see the file COPYING3. If not see |
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+// <http://www.gnu.org/licenses/>. |
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+ |
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+// { dg-require-fileio "" } |
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+ |
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+// PR libstdc++/81395 |
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+ |
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+#include <fstream> |
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+#include <cstring> // for std::memset |
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+#include <cstdio> // For BUFSIZ |
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+ |
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+using std::memset; |
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+ |
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+int main() |
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+{ |
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+ { |
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+ std::filebuf fb; |
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+ fb.open("test.txt", std::ios::out); |
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+ char data[BUFSIZ]; |
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+ memset(data, 'A', sizeof(data)); |
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+ fb.sputn(data, sizeof(data)); |
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+ } |
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+ |
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+ std::filebuf fb; |
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+ fb.open("test.txt", std::ios::in|std::ios::out); |
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+ char buf[BUFSIZ]; |
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+ memset(buf, 0, sizeof(buf)); |
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+ fb.sgetn(buf, sizeof(buf)); |
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+ // Switch from reading to writing without seeking first: |
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+ fb.sputn("B", 1); |
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+ fb.pubsync(); |
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+}
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