1 files changed, 82 insertions, 0 deletions
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/12790-1.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/12790-1.cc
new file mode 100644
index 00000000000..79a625169eb
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/12790-1.cc
@@ -0,0 +1,82 @@
+// 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 <locale>
+#include <fstream>
+#include <testsuite_hooks.h>
+#include <testsuite_character.h>
+
+// libstdc++/12790
+void test01()
+{
+  using namespace std;
+  using __gnu_test::character;
+  typedef basic_filebuf<character>::traits_type traits_type;
+
+  bool test __attribute__((unused)) = true;
+  const char* name = "tmp_seekoff_12790";
+
+  locale loc(locale::classic(),
+	     new codecvt<traits_type::char_type, char,
+	     traits_type::state_type>);
+
+  basic_filebuf<character> fb;
+  fb.pubimbue(loc);
+
+  fb.open(name, ios_base::out);
+  fb.sputc(character::from_char(0xff));
+  fb.sputc(character::from_char(0));
+  fb.sputc(character::from_char(0));
+  fb.sputc(character::from_char('a'));
+  fb.sputc(character::from_char('a'));
+  fb.sputc(character::from_char('a'));
+  fb.sputc(character::from_char('a'));
+  fb.close();
+
+  fb.open(name, ios_base::in);
+  fb.sbumpc();
+  fb.sbumpc();
+  fb.sbumpc();
+
+  // Check that seekoff calls codecvt::length with the correct state.
+  traits_type::pos_type pos = fb.pubseekoff(0, ios_base::cur);
+  VERIFY( pos != traits_type::pos_type(traits_type::off_type(-1)) );
+
+  traits_type::int_type c = fb.sbumpc();
+  VERIFY( c != traits_type::eof() );
+  VERIFY( traits_type::eq(traits_type::to_char_type(c),
+			  character::from_char('a')) );
+  fb.sbumpc();
+  fb.sbumpc();
+  c = fb.sbumpc();
+  VERIFY( c != traits_type::eof() );
+  VERIFY( traits_type::eq(traits_type::to_char_type(c),
+			  character::from_char('a')) );
+  c = fb.sbumpc();
+  VERIFY( c == traits_type::eof() );
+
+  fb.close();
+}
+
+int main()
+{
+  test01();
+  return 0;
+}