--- /dev/null
+// Copyright (C) 2004, 2009 Free Software Foundation
+//
+// 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/>.
+
+// 27.6.1.3 unformatted input functions
+// NB: ostream has a particular "seeks" category. Adopt this for istreams too.
+// @require@ %-*.tst %-*.txt
+// @diff@ %-*.tst %-*.txt
+
+#include <istream>
+#include <sstream>
+#include <fstream>
+#include <testsuite_hooks.h>
+
+// fstreams
+void test04(void)
+{
+ typedef std::wistream::off_type off_type;
+
+ bool test __attribute__((unused)) = true;
+ std::wistream::pos_type pos01, pos02, pos03, pos04, pos05, pos06;
+ std::ios_base::iostate state01, state02;
+ const char str_lit01[] = "wistream_seeks-1.txt";
+ const char str_lit02[] = "wistream_seeks-2.txt";
+ std::wifstream if01(str_lit01, std::ios_base::in | std::ios_base::out);
+ std::wifstream if02(str_lit01, std::ios_base::in);
+ std::wifstream if03(str_lit02, std::ios_base::out | std::ios_base::trunc);
+ VERIFY( if01.good() );
+ VERIFY( if02.good() );
+ VERIFY( if03.good() );
+
+ std::wistream is01(if01.rdbuf());
+ std::wistream is02(if02.rdbuf());
+ std::wistream is03(if03.rdbuf());
+
+ // pos_type tellg()
+ // in | out
+ pos01 = is01.tellg();
+ pos02 = is01.tellg();
+ VERIFY( pos01 == pos02 );
+
+ // in
+ pos03 = is02.tellg();
+ pos04 = is02.tellg();
+ VERIFY( pos03 == pos04 );
+
+ // out
+ pos05 = is03.tellg();
+ pos06 = is03.tellg();
+ VERIFY( pos05 == pos06 );
+
+ // cur
+ // NB: see library issues list 136. It's the v-3 interp that seekg
+ // only sets the input buffer, or else istreams with buffers that
+ // have _M_mode == ios_base::out will fail to have consistency
+ // between seekg and tellg.
+ state01 = is01.rdstate();
+ is01.seekg(10, std::ios_base::cur);
+ state02 = is01.rdstate();
+ pos01 = is01.tellg();
+ VERIFY( pos01 == pos02 + off_type(10) );
+ VERIFY( state01 == state02 );
+ pos02 = is01.tellg();
+ VERIFY( pos02 == pos01 );
+}
+
+int main()
+{
+ test04();
+ return 0;
+}