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

   1 // 2003-05-01  Petur Runolfsson  <peturr02@ru.is>
   2
   3 // Copyright (C) 2003, 2009 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 3, 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 COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 // { dg-require-fileio "" }
  21
  22 #include <iostream>
  23 #include <cstdio>
  24 #include <testsuite_hooks.h>
  25
  26 void test10()
  27 {
  28   using namespace std;
  29
  30   bool test __attribute__((unused)) = true;
  31   const char* name = "filebuf_virtuals-1.txt";
  32
  33   FILE* ret = freopen(name, "r", stdin);
  34   VERIFY( ret != NULL );
  35
  36   streampos p1 = cin.tellg();
  37   VERIFY( p1 != streampos(-1) );
  38   VERIFY( streamoff(p1) == 0 );
  39
  40   cin.seekg(0, ios::end);
  41   VERIFY( cin.good() );
  42
  43   streampos p2 = cin.tellg();
  44   VERIFY( p2 != streampos(-1) );
  45   VERIFY( p2 != p1 );
  46   VERIFY( streamoff(p2) == ftell(stdin) );
  47
  48   cin.seekg(p1);
  49   VERIFY( cin.good() );
  50
  51   streamoff n = p2 - p1;
  52   VERIFY( n > 0 );
  53
  54   for (int i = 0; i < n; ++i)
  55     {
  56       streampos p3 = cin.tellg();
  57       VERIFY( streamoff(p3) == i );
  58       VERIFY( ftell(stdin) == i );
  59       cin.get();
  60       VERIFY( cin.good() );
  61     }
  62
  63   streampos p4 = cin.tellg();
  64   VERIFY( streamoff(p4) == n );
  65   VERIFY( ftell(stdin) == n );
  66   cin.get();
  67   VERIFY( cin.eof() );
  68 }
  69
  70 int main()
  71 {
  72   test10();
  73   return 0;
  74 }