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

   1 // 2003-05-01  Petur Runolfsson  <peturr02@ru.is>
   2
   3 // Copyright (C) 2003-2014 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 // { dg-require-binary-io "" }
  22
  23 #include <iostream>
  24 #include <cstdio>
  25 #include <testsuite_hooks.h>
  26
  27 void test10()
  28 {
  29   using namespace std;
  30
  31   bool test __attribute__((unused)) = true;
  32   const char* name = "filebuf_virtuals-1.txt";
  33
  34   FILE* ret = freopen(name, "r", stdin);
  35   VERIFY( ret );
  36
  37   streampos p1 = cin.tellg();
  38   VERIFY( p1 != streampos(-1) );
  39   VERIFY( streamoff(p1) == 0 );
  40
  41   cin.seekg(0, ios::end);
  42   VERIFY( cin.good() );
  43
  44   streampos p2 = cin.tellg();
  45   VERIFY( p2 != streampos(-1) );
  46   VERIFY( p2 != p1 );
  47   VERIFY( streamoff(p2) == ftell(stdin) );
  48
  49   cin.seekg(p1);
  50   VERIFY( cin.good() );
  51
  52   streamoff n = p2 - p1;
  53   VERIFY( n > 0 );
  54
  55   for (int i = 0; i < n; ++i)
  56     {
  57       streampos p3 = cin.tellg();
  58       VERIFY( streamoff(p3) == i );
  59       VERIFY( ftell(stdin) == i );
  60       cin.get();
  61       VERIFY( cin.good() );
  62     }
  63
  64   streampos p4 = cin.tellg();
  65   VERIFY( streamoff(p4) == n );
  66   VERIFY( ftell(stdin) == n );
  67   cin.get();
  68   VERIFY( cin.eof() );
  69 }
  70
  71 int main()
  72 {
  73   test10();
  74   return 0;
  75 }