libstdc++-v3/testsuite/27_io/objects/char/10.cc

   1 // 2003-05-01  Petur Runolfsson  <peturr02@ru.is>
   2
   3 // Copyright (C) 2003 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 2, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 #include <iostream>
  22 #include <cstdio>
  23 #include <testsuite_hooks.h>
  24
  25 void test10()
  26 {
  27   using namespace std;
  28
  29   bool test __attribute__((unused)) = true;
  30   const char* name = "filebuf_virtuals-1.txt";
  31
  32   FILE* ret = freopen(name, "r", stdin);
  33   VERIFY( ret != NULL );
  34
  35   streampos p1 = cin.tellg();
  36   VERIFY( p1 != streampos(-1) );
  37   VERIFY( streamoff(p1) == 0 );
  38
  39   cin.seekg(0, ios::end);
  40   VERIFY( cin.good() );
  41
  42   streampos p2 = cin.tellg();
  43   VERIFY( p2 != streampos(-1) );
  44   VERIFY( p2 != p1 );
  45   VERIFY( streamoff(p2) == ftell(stdin) );
  46
  47   cin.seekg(p1);
  48   VERIFY( cin.good() );
  49
  50   streamoff n = p2 - p1;
  51   VERIFY( n > 0 );
  52
  53   for (int i = 0; i < n; ++i)
  54     {
  55       streampos p3 = cin.tellg();
  56       VERIFY( streamoff(p3) == i );
  57       VERIFY( ftell(stdin) == i );
  58       cin.get();
  59       VERIFY( cin.good() );
  60     }
  61
  62   streampos p4 = cin.tellg();
  63   VERIFY( streamoff(p4) == n );
  64   VERIFY( ftell(stdin) == n );
  65   cin.get();
  66   VERIFY( cin.eof() );
  67 }
  68
  69 int main()
  70 {
  71   test10();
  72   return 0;
  73 }