libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/12790-2.cc

   1 // Copyright (C) 2003-2024 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // 27.8.1.4 Overridden virtual functions
  19
  20 // { dg-require-fileio "" }
  21
  22 #include <locale>
  23 #include <fstream>
  24 #include <testsuite_hooks.h>
  25 #include <testsuite_character.h>
  26
  27 // libstdc++/12790
  28 void test01()
  29 {
  30   using namespace std;
  31   using __gnu_test::pod_uchar;
  32   typedef basic_filebuf<pod_uchar>::traits_type traits_type;
  33
  34   const char* name = "tmp_seekoff_12790";
  35
  36   locale loc(locale::classic(),
  37              new codecvt<traits_type::char_type, char,
  38              traits_type::state_type>);
  39
  40   basic_filebuf<pod_uchar> fb;
  41   fb.pubimbue(loc);
  42
  43   fb.open(name, ios_base::out);
  44   fb.sputc(pod_uchar::from<char>(0xff));
  45   fb.sputc(pod_uchar::from<char>(0));
  46   fb.sputc(pod_uchar::from<char>(0));
  47   fb.sputc(pod_uchar::from<char>('a'));
  48   fb.sputc(pod_uchar::from<char>('a'));
  49   fb.sputc(pod_uchar::from<char>('a'));
  50   fb.sputc(pod_uchar::from<char>('a'));
  51   fb.close();
  52
  53   fb.open(name, ios_base::in);
  54   fb.sbumpc();
  55   fb.sbumpc();
  56   fb.sbumpc();
  57
  58   // Check that seekoff resets the state when seeking to beginning.
  59   traits_type::pos_type pos = fb.pubseekoff(0, ios_base::beg);
  60   VERIFY( pos != traits_type::pos_type(traits_type::off_type(-1)) );
  61
  62   traits_type::int_type c = fb.sbumpc();
  63   VERIFY( c != traits_type::eof() );
  64   VERIFY( traits_type::eq(traits_type::to_char_type(c),
  65                           pod_uchar::from<char>(0xff)) );
  66   fb.sbumpc();
  67   fb.sbumpc();
  68   fb.sbumpc();
  69   fb.sbumpc();
  70   fb.sbumpc();
  71   c = fb.sbumpc();
  72   VERIFY( c != traits_type::eof() );
  73   VERIFY( traits_type::eq(traits_type::to_char_type(c),
  74                           pod_uchar::from<char>('a')) );
  75   c = fb.sbumpc();
  76   VERIFY( c == traits_type::eof() );
  77
  78   fb.close();
  79 }
  80
  81 int main()
  82 {
  83   test01();
  84   return 0;
  85 }