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

   1 // 2000-06-29 bkoz
   2
   3 // Copyright (C) 2000-2016 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 // 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 // stringstreams
  31 void test05(void)
  32 {
  33   typedef std::istream::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.tst";
  39   std::wifstream if01(str_lit01);
  40   std::wifstream if02(str_lit01);
  41   std::wifstream if03(str_lit01);
  42   VERIFY( if01.good() );
  43   VERIFY( if02.good() );
  44   VERIFY( if03.good() );
  45
  46   std::wstringbuf strbuf01(std::ios_base::in | std::ios_base::out);
  47   if01 >> &strbuf01;
  48   // initialize stringbufs that are ios_base::out
  49   std::wstringbuf strbuf03(strbuf01.str(), std::ios_base::out);
  50   // initialize stringbufs that are ios_base::in
  51   std::wstringbuf strbuf02(strbuf01.str(), std::ios_base::in);
  52
  53   std::wistream is01(&strbuf01);
  54   std::wistream is02(&strbuf02);
  55   std::wistream is03(&strbuf03);
  56
  57   // pos_type tellg()
  58   // in | out
  59   pos01 = is01.tellg();
  60   pos02 = is01.tellg();
  61   pos03 = is02.tellg();
  62   pos04 = is02.tellg();
  63   pos05 = is03.tellg();
  64   pos06 = is03.tellg();
  65
  66   // istream& seekg(pos_type)
  67   // istream& seekg(off_type, ios_base::seekdir)
  68
  69   // cur
  70   // NB: see library issues list 136. It's the v-3 interp that seekg
  71   // only sets the input buffer, or else istreams with buffers that
  72   // have _M_mode == ios_base::out will fail to have consistency
  73   // between seekg and tellg.
  74   state01 = is01.rdstate();
  75   is01.seekg(10, std::ios_base::cur);
  76   state02 = is01.rdstate();
  77   pos01 = is01.tellg();
  78   VERIFY( pos01 == pos02 + off_type(10) );
  79   VERIFY( state01 == state02 );
  80   pos02 = is01.tellg();
  81   VERIFY( pos02 == pos01 );
  82
  83   state01 = is02.rdstate();
  84   is02.seekg(10, std::ios_base::cur);
  85   state02 = is02.rdstate();
  86   pos03 = is02.tellg();
  87   VERIFY( pos03 == pos04 + off_type(10) );
  88   VERIFY( state01 == state02 );
  89   pos04 = is02.tellg();
  90   VERIFY( pos03 == pos04 );
  91
  92   state01 = is03.rdstate();
  93   is03.seekg(10, std::ios_base::cur);
  94   state02 = is03.rdstate();
  95   pos05 = is03.tellg();
  96   VERIFY( pos05 == pos06 ); // as only out buffer
  97   VERIFY( state01 != state02 );
  98   pos06 = is03.tellg();
  99   VERIFY( pos05 == pos06 );
 100
 101   // beg
 102   state01 = is01.rdstate();
 103   is01.seekg(20, std::ios_base::beg);
 104   state02 = is01.rdstate();
 105   pos01 = is01.tellg();
 106   VERIFY( pos01 == pos02 + off_type(10) );
 107   VERIFY( state01 == state02 );
 108   pos02 = is01.tellg();
 109   VERIFY( pos02 == pos01 );
 110
 111   state01 = is02.rdstate();
 112   is02.seekg(20, std::ios_base::beg);
 113   state02 = is02.rdstate();
 114   pos03 = is02.tellg();
 115   VERIFY( pos03 == pos04 + off_type(10) );
 116   VERIFY( state01 == state02 );
 117   pos04 = is02.tellg();
 118   VERIFY( pos03 == pos04 );
 119
 120   state01 = is03.rdstate();
 121   is03.seekg(20, std::ios_base::beg);
 122   state02 = is03.rdstate();
 123   pos05 = is03.tellg();
 124   VERIFY( pos05 == pos06 ); // as only out buffer
 125   VERIFY( state01 == state02 );
 126   pos06 = is03.tellg();
 127   VERIFY( pos05 == pos06 );
 128 }
 129
 130 int main()
 131 {
 132   test05();
 133   return 0;
 134 }