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2017-07-25 Jonathan Wakely <jwakely@redhat.com>
PR libstdc++/53984
* include/bits/basic_ios.h (basic_ios::_M_setstate): Adjust comment.
* include/bits/istream.tcc (basic_istream::sentry): Handle exceptions
during construction.
* include/std/istream: Adjust comments for formatted input functions
and unformatted input functions.
* testsuite/27_io/basic_fstream/53984.cc: New.
* testsuite/27_io/basic_istream/sentry/char/53984.cc: New.
--- libstdc++-v3/include/bits/basic_ios.h
+++ libstdc++-v3/include/bits/basic_ios.h
@@ -157,8 +157,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
setstate(iostate __state)
{ this->clear(this->rdstate() | __state); }
- // Flip the internal state on for the proper state bits, then re
- // throws the propagated exception if bit also set in
+ // Flip the internal state on for the proper state bits, then
+ // rethrows the propagated exception if bit also set in
// exceptions().
void
_M_setstate(iostate __state)
--- libstdc++-v3/include/bits/istream.tcc
+++ libstdc++-v3/include/bits/istream.tcc
@@ -48,28 +48,36 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{
ios_base::iostate __err = ios_base::goodbit;
if (__in.good())
- {
- if (__in.tie())
- __in.tie()->flush();
- if (!__noskip && bool(__in.flags() & ios_base::skipws))
- {
- const __int_type __eof = traits_type::eof();
- __streambuf_type* __sb = __in.rdbuf();
- __int_type __c = __sb->sgetc();
-
- const __ctype_type& __ct = __check_facet(__in._M_ctype);
- while (!traits_type::eq_int_type(__c, __eof)
- && __ct.is(ctype_base::space,
- traits_type::to_char_type(__c)))
- __c = __sb->snextc();
+ __try
+ {
+ if (__in.tie())
+ __in.tie()->flush();
+ if (!__noskip && bool(__in.flags() & ios_base::skipws))
+ {
+ const __int_type __eof = traits_type::eof();
+ __streambuf_type* __sb = __in.rdbuf();
+ __int_type __c = __sb->sgetc();
+
+ const __ctype_type& __ct = __check_facet(__in._M_ctype);
+ while (!traits_type::eq_int_type(__c, __eof)
+ && __ct.is(ctype_base::space,
+ traits_type::to_char_type(__c)))
+ __c = __sb->snextc();
- // _GLIBCXX_RESOLVE_LIB_DEFECTS
- // 195. Should basic_istream::sentry's constructor ever
- // set eofbit?
- if (traits_type::eq_int_type(__c, __eof))
- __err |= ios_base::eofbit;
- }
- }
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 195. Should basic_istream::sentry's constructor ever
+ // set eofbit?
+ if (traits_type::eq_int_type(__c, __eof))
+ __err |= ios_base::eofbit;
+ }
+ }
+ __catch(__cxxabiv1::__forced_unwind&)
+ {
+ __in._M_setstate(ios_base::badbit);
+ __throw_exception_again;
+ }
+ __catch(...)
+ { __in._M_setstate(ios_base::badbit); }
if (__in.good() && __err == ios_base::goodbit)
_M_ok = true;
--- libstdc++-v3/include/std/istream
+++ libstdc++-v3/include/std/istream
@@ -150,9 +150,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* whatever data is appropriate for the type of the argument.
*
* If an exception is thrown during extraction, ios_base::badbit
- * will be turned on in the stream's error state without causing an
- * ios_base::failure to be thrown. The original exception will then
- * be rethrown.
+ * will be turned on in the stream's error state (without causing an
+ * ios_base::failure to be thrown) and the original exception will
+ * be rethrown if badbit is set in the exceptions mask.
*/
//@{
@@ -286,9 +286,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
* by gcount().
*
* If an exception is thrown during extraction, ios_base::badbit
- * will be turned on in the stream's error state without causing an
- * ios_base::failure to be thrown. The original exception will then
- * be rethrown.
+ * will be turned on in the stream's error state (without causing an
+ * ios_base::failure to be thrown) and the original exception will
+ * be rethrown if badbit is set in the exceptions mask.
*/
/**
--- /dev/null
+++ libstdc++-v3/testsuite/27_io/basic_fstream/53984.cc
@@ -0,0 +1,64 @@
+// Copyright (C) 2017 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-require-fileio "" }
+
+// PR libstdc++/53984
+
+#include <fstream>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+ std::ifstream in(".");
+ if (in)
+ {
+ char c;
+ if (in.get(c))
+ {
+ // Reading a directory doesn't produce an error on this target
+ // so the formatted input functions below wouldn't fail anyway
+ // (see PR libstdc++/81808).
+ return;
+ }
+ int x;
+ in.clear();
+ // Formatted input function should set badbit, but not throw:
+ in >> x;
+ VERIFY( in.bad() );
+
+ in.clear();
+ in.exceptions(std::ios::badbit);
+ try
+ {
+ // Formatted input function should set badbit, and throw:
+ in >> x;
+ VERIFY( false );
+ }
+ catch (const std::exception&)
+ {
+ VERIFY( in.bad() );
+ }
+ }
+}
+
+int
+main()
+{
+ test01();
+}
--- /dev/null
+++ libstdc++-v3/testsuite/27_io/basic_istream/sentry/char/53984.cc
@@ -0,0 +1,41 @@
+// Copyright (C) 2017 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <streambuf>
+#include <istream>
+#include <testsuite_hooks.h>
+
+struct SB : std::streambuf
+{
+ virtual int_type underflow() { throw 1; }
+};
+
+void
+test01()
+{
+ SB sb;
+ std::istream is(&sb);
+ int i;
+ is >> i;
+ VERIFY( is.bad() );
+}
+
+int
+main()
+{
+ test01();
+}
|
