--- /dev/null
+// 2001-05-21 Benjamin Kosnik <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003, 2009 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/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+// { dg-require-fileio "" }
+
+#include <fstream>
+#include <testsuite_hooks.h>
+#include <testsuite_io.h>
+
+// @require@ %-*.tst %-*.txt
+// @diff@ %-*.tst %*.txt
+
+const char name_01[] = "seekoff.txt";
+
+void test05()
+{
+ using namespace std;
+ using namespace __gnu_test;
+
+ typedef filebuf::int_type int_type;
+ typedef filebuf::pos_type pos_type;
+ typedef filebuf::off_type off_type;
+ typedef filebuf::traits_type traits_type;
+
+ bool test __attribute__((unused)) = true;
+ streamsize strmsz_1, strmsz_2;
+
+ int_type c1;
+ int_type c2;
+ int_type c3;
+
+ pos_type pt_1(off_type(-1));
+ pos_type pt_2(off_type(0));
+ off_type off_1 = 0;
+ off_type off_2 = 0;
+
+ // seekoff
+ // pubseekoff(off_type off, ios_base::seekdir way, ios_base::openmode which)
+ // alters the stream position to off
+
+ // in
+ {
+ constraint_filebuf fb;
+ fb.open(name_01, ios_base::in);
+ VERIFY( !fb.write_position() );
+
+ //beg
+ strmsz_1 = fb.in_avail();
+ pt_1 = fb.pubseekoff(2, ios_base::beg);
+ strmsz_2 = fb.in_avail();
+ off_1 = off_type(pt_1);
+ VERIFY( off_1 > 0 );
+ c1 = fb.snextc(); //current in pointer +1
+ VERIFY( c1 == '9' );
+ fb.pubseekoff(3, ios_base::beg);
+ c2 = fb.sputc('\n'); //current in pointer +1
+ fb.pubseekoff(4, ios_base::beg);
+ c3 = fb.sgetc();
+ VERIFY( c2 == traits_type::eof() );
+ VERIFY( c3 == '9' );
+ fb.pubsync();
+ c1 = fb.sgetc();
+ VERIFY( c1 == c3 );
+
+ //cur
+ pt_2 = fb.pubseekoff(2, ios_base::cur);
+ off_2 = off_type(pt_2);
+ VERIFY( (off_2 == (off_1 + 2 + 1 + 1)) );
+ c1 = fb.snextc(); //current in pointer +1
+ VERIFY( c1 == '1' );
+ fb.pubseekoff(0, ios_base::cur);
+ c2 = fb.sputc('x'); //test current out pointer
+ c3 = fb.sputc('\n');
+ VERIFY( c2 == traits_type::eof() );
+ VERIFY( c3 == traits_type::eof() );
+ fb.pubseekoff(0, ios_base::cur);
+ c1 = fb.sgetc();
+ fb.pubsync();
+ c3 = fb.sgetc();
+ VERIFY( c1 == c3 );
+
+ //end
+ pt_2 = fb.pubseekoff(0, ios_base::end);
+ off_1 = off_type(pt_2);
+ VERIFY( off_1 > off_2 ); //weak, but don't know exactly where it ends
+ c3 = fb.sputc('\n');
+ strmsz_1 = fb.sputn("because because because. . .", 28);
+ VERIFY( strmsz_1 == 0 );
+ fb.pubseekoff(-1, ios_base::end);
+ fb.sgetc();
+ c1 = fb.sungetc();
+ // Defect? retval of sungetc is not necessarily the character ungotten.
+ // So re-get it.
+ c1 = fb.sgetc();
+ fb.pubsync();
+ c3 = fb.sgetc();
+ VERIFY( c1 == c3 );
+ VERIFY( !fb.write_position() );
+ }
+}
+
+int main()
+{
+ test05();
+ return 0;
+}