libstdc++-v3/testsuite/27_io/basic_istream/seekg/wchar_t/fstream.cc

   1 // Copyright (C) 2004-2014 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 // { dg-require-fileio "" }
  19
  20 // 27.6.1.3 unformatted input functions
  21 // NB: ostream has a particular "seeks" category. Adopt this for istreams too.
  22 // @require@ %-*.tst %-*.txt
  23 // @diff@ %-*.tst %-*.txt
  24
  25 #include <istream>
  26 #include <sstream>
  27 #include <fstream>
  28 #include <testsuite_hooks.h>
  29
  30 // fstreams
  31 void test04(void)
  32 {
  33   typedef std::wistream::off_type off_type;
  34
  35   bool test __attribute__((unused)) = true;
  36   std::wistream::pos_type pos01, pos02, pos03, pos04, pos05, pos06;
  37   std::ios_base::iostate state01, state02;
  38   const char str_lit01[] = "wistream_seeks-1.txt";
  39   const char str_lit02[] = "wistream_seeks-2.txt";
  40   std::wifstream if01(str_lit01, std::ios_base::in | std::ios_base::out);
  41   std::wifstream if02(str_lit01, std::ios_base::in);
  42   std::wifstream if03(str_lit02, std::ios_base::out | std::ios_base::trunc);
  43   VERIFY( if01.good() );
  44   VERIFY( if02.good() );
  45   VERIFY( if03.good() );
  46
  47   std::wistream is01(if01.rdbuf());
  48   std::wistream is02(if02.rdbuf());
  49   std::wistream is03(if03.rdbuf());
  50
  51   pos01 = is01.tellg();
  52   pos02 = is01.tellg();
  53   pos03 = is02.tellg();
  54   pos04 = is02.tellg();
  55   pos05 = is03.tellg();
  56   pos06 = is03.tellg();
  57
  58   // istream& seekg(pos_type)
  59   // istream& seekg(off_type, ios_base::seekdir)
  60
  61   // cur
  62   // NB: see library issues list 136. It's the v3 interp that seekg
  63   // only sets the input buffer, or else istreams with buffers that
  64   // have _M_mode == ios_base::out will fail to have consistency
  65   // between seekg and tellg.
  66   state01 = is01.rdstate();
  67   is01.seekg(10, std::ios_base::cur);
  68   state02 = is01.rdstate();
  69   pos01 = is01.tellg();
  70   VERIFY( pos01 == pos02 + off_type(10) );
  71   VERIFY( state01 == state02 );
  72   pos02 = is01.tellg();
  73   VERIFY( pos02 == pos01 );
  74
  75   state01 = is02.rdstate();
  76   is02.seekg(10, std::ios_base::cur);
  77   state02 = is02.rdstate();
  78   pos03 = is02.tellg();
  79   VERIFY( pos03 == pos04 + off_type(10) );
  80   VERIFY( state01 == state02 );
  81   pos04 = is02.tellg();
  82   VERIFY( pos03 == pos04 );
  83
  84   state01 = is03.rdstate();
  85   is03.seekg(10, std::ios_base::cur);
  86   state02 = is03.rdstate();
  87   pos05 = is03.tellg();
  88   VERIFY( pos05 == pos06 + off_type(10) );
  89   VERIFY( state01 == state02 );
  90   pos06 = is03.tellg();
  91   VERIFY( pos05 == pos06 );
  92
  93   // beg
  94   state01 = is01.rdstate();
  95   is01.seekg(20, std::ios_base::beg);
  96   state02 = is01.rdstate();
  97   pos01 = is01.tellg();
  98   VERIFY( pos01 == pos02 + off_type(10) );
  99   VERIFY( state01 == state02 );
 100   pos02 = is01.tellg();
 101   VERIFY( pos02 == pos01 );
 102
 103   state01 = is02.rdstate();
 104   is02.seekg(20, std::ios_base::beg);
 105   state02 = is02.rdstate();
 106   pos03 = is02.tellg();
 107   VERIFY( pos03 == pos04 + off_type(10) );
 108   VERIFY( state01 == state02 );
 109   pos04 = is02.tellg();
 110   VERIFY( pos03 == pos04 );
 111
 112   state01 = is03.rdstate();
 113   is03.seekg(20, std::ios_base::beg);
 114   state02 = is03.rdstate();
 115   pos05 = is03.tellg();
 116   VERIFY( pos05 == pos06 + off_type(10) );
 117   VERIFY( state01 == state02 );
 118   pos06 = is03.tellg();
 119   VERIFY( pos05 == pos06 );
 120 }
 121
 122 int main()
 123 {
 124   test04();
 125   return 0;
 126 }