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re PR libstdc++/12868 (basic_filebuf::imbue fails too easily)

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2003-11-18  Paolo Carlini  <pcarlini@suse.de>

	PR libstdc++/12868
	* include/bits/fstream.tcc (imbue): For encodings != -1 it's
	always ok to imbue a new locale, provided seekoff(0, cur, ...)
	doesn't fail, of course.
	(underflow): In order for the above to work, deal gracefully
	with _M_codecvt->in returning codecvt_base::error while
	(__ilen = __iend - this->eback()) > 0: it just means __ilen
	correctly converted internal characters before an error.
	* testsuite/27_io/basic_filebuf/imbue/wchar_t/12868.cc: New.

From-SVN: r73697
This commit is contained in:
Paolo Carlini 2003-11-18 08:21:38 +00:00 committed by Paolo Carlini
parent 0ec5fef218
commit 2934246345
3 changed files with 85 additions and 18 deletions
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12
libstdc++-v3/ChangeLog
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@ -1,3 +1,15 @@
2003-11-18 Paolo Carlini <pcarlini@suse.de>
PR libstdc++/12868
* include/bits/fstream.tcc (imbue): For encodings != -1 it's
always ok to imbue a new locale, provided seekoff(0, cur, ...)
doesn't fail, of course.
(underflow): In order for the above to work, deal gracefully
with _M_codecvt->in returning codecvt_base::error while
(__ilen = __iend - this->eback()) > 0: it just means __ilen
correctly converted internal characters before an error.
* testsuite/27_io/basic_filebuf/imbue/wchar_t/12868.cc: New.
2003-11-17 Paolo Carlini <pcarlini@suse.de>
* include/bits/locale_facets.tcc: Fix typo in comment.

31
libstdc++-v3/include/bits/fstream.tcc
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@ -269,9 +269,7 @@ namespace std
__r = _M_codecvt->in(_M_state_cur, _M_ext_next,
_M_ext_end, _M_ext_next, this->eback(),
this->eback() + __buflen, __iend);
if (__r == codecvt_base::ok || __r == codecvt_base::partial)
__ilen = __iend - this->eback();
else if (__r == codecvt_base::noconv)
if (__r == codecvt_base::noconv)
{
size_t __avail = _M_ext_end - _M_ext_buf;
__ilen = std::min(__avail, __buflen);
@ -279,11 +277,15 @@ namespace std
reinterpret_cast<char_type*>(_M_ext_buf), __ilen);
_M_ext_next = _M_ext_buf + __ilen;
}
else
{
__ilen = 0;
break;
}
else
__ilen = __iend - this->eback();
// _M_codecvt->in may return error while __ilen > 0: this is
// ok, and actually occurs in case of mixed encodings (e.g.,
// XML files).
if (__r == codecvt_base::error)
break;
__rlen = 1;
}
while (!__got_eof && __ilen == 0);
@ -747,13 +749,13 @@ namespace std
bool __testfail = false;
if (this->is_open())
{
const bool __testbeg =
const bool __testseek =
this->seekoff(0, ios_base::cur, this->_M_mode) ==
pos_type(off_type(0));
pos_type(off_type(-1));
const bool __teststate =
__check_facet(_M_codecvt).encoding() == -1;
__testfail = !__testbeg || __teststate;
__testfail = __testseek || __teststate;
}
if (!__testfail)
@ -762,13 +764,6 @@ namespace std
_M_codecvt = &use_facet<__codecvt_type>(__loc);
else
_M_codecvt = 0;
// NB This may require the reconversion of previously
// converted chars. This in turn may cause the
// reconstruction of the original file. YIKES!! This
// implementation interprets this requirement as requiring
// the file position be at the beginning, and a stateless
// encoding, or that the filebuf be closed. Opinions may differ.
}
}
}

60
libstdc++-v3/testsuite/27_io/basic_filebuf/imbue/wchar_t/12868.cc Normal file
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@ -0,0 +1,60 @@
// Copyright (C) 2003 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 2, 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 COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// 27.8.1.4 Overridden virtual functions
#include <ostream>
#include <fstream>
#include <locale>
#include <string>
#include <testsuite_hooks.h>
// libstdc++/12868
void test01()
{
using namespace std;
bool test __attribute__((unused)) = true;
locale loc_is(__gnu_test::try_named_locale("is_IS"));
{
wofstream out("tmp_12868");
out << L"<? xml version=\"1.0\" encoding=\"UTF-8\" ?>\n";
out.imbue(loc_is);
VERIFY( out.rdbuf()->getloc() == loc_is );
out << L"<greeting>Hall\u00f3 heimur</greeting>\n";
}
{
wifstream in("tmp_12868");
wstring str;
getline(in, str);
if (str.find(L"encoding=\"UTF-8\"") != wstring::npos)
{
in.imbue(loc_is);
VERIFY( in.rdbuf()->getloc() == loc_is );
}
getline(in, str);
VERIFY( str == L"<greeting>Hall\u00f3 heimur</greeting>" );
}
}
int main()
{
test01();
}