--- /dev/null
+// 2003-05-01 Petur Runolfsson <peturr02@ru.is>
+
+// Copyright (C) 2003, 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/>.
+
+// { dg-require-fileio "" }
+
+#include <ext/stdio_sync_filebuf.h>
+#include <testsuite_hooks.h>
+
+// libstdc++/12048
+void test03()
+{
+ bool test __attribute__((unused)) = true;
+ const char* name = "cin_unget-1.txt";
+
+ std::FILE* file = std::fopen(name, "r");
+ __gnu_cxx::stdio_sync_filebuf<char> sbuf(file);
+ int c1 = sbuf.sbumpc();
+ VERIFY( c1 != EOF );
+ int c2 = sbuf.sungetc();
+ VERIFY( c2 != EOF );
+ int c3 = std::fgetc(file);
+ VERIFY( c3 == c1 );
+
+ std::fclose(file);
+}
+
+int main ()
+{
+ test03();
+ return 0;
+}