libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/wchar_t/4.cc

   1 // { dg-require-fileio "" }
   2
   3 // Copyright (C) 2010-2014 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 // 27.8.1.4 Overridden virtual functions
  21
  22 #include <fstream>
  23 #include <cwchar>
  24 #include <cstring>
  25 #include <testsuite_hooks.h>
  26
  27 void test01()
  28 {
  29   using namespace std;
  30   bool test __attribute__((unused)) = true;
  31
  32   typedef wfilebuf::pos_type pos_type;
  33   const char name[] = "tmp_seekoff-4.tst";
  34
  35   const size_t size = 12;
  36   wchar_t buf[size];
  37   streamsize n;
  38
  39   wfilebuf fb;
  40   fb.open(name, ios_base::in | ios_base::out | ios_base::trunc);
  41
  42   n = fb.sputn(L"abcd", 4);
  43   VERIFY( n == 4 );
  44
  45   fb.pubseekoff(0, ios_base::beg);
  46   n = fb.sgetn(buf, 3);
  47   VERIFY( n == 3 );
  48   VERIFY( !wmemcmp(buf, L"abc", 3) );
  49
  50   // Check read => write without pubseekoff(0, ios_base::cur)
  51
  52   n = fb.sputn(L"ef", 2);
  53   VERIFY( n == 2 );
  54
  55   fb.pubseekoff(0, ios_base::beg);
  56
  57   n = fb.sgetn(buf, size);
  58   VERIFY( n == 5 );
  59   VERIFY( !wmemcmp(buf, L"abcef", 5) );
  60
  61   fb.pubseekoff(0, ios_base::beg);
  62   n = fb.sputn(L"gh", 2);
  63   VERIFY( n == 2 );
  64
  65   // Check write => read without pubseekoff(0, ios_base::cur)
  66
  67   n = fb.sgetn( buf, 3 );
  68   VERIFY( !memcmp(buf, L"cef", 3) );
  69
  70   n = fb.sputn(L"ijkl", 4);
  71   VERIFY( n == 4 );
  72
  73   fb.pubseekoff(0, ios_base::beg);
  74   n = fb.sgetn(buf, 2);
  75   VERIFY( n == 2 );
  76   VERIFY( !wmemcmp(buf, L"gh", 2) );
  77
  78   fb.pubseekoff(0, ios_base::end);
  79   n = fb.sputn(L"mno", 3);
  80   VERIFY( n == 3 );
  81
  82   fb.pubseekoff(0, ios_base::beg);
  83   n = fb.sgetn(buf, size);
  84   VERIFY( n == 12 );
  85   VERIFY( !wmemcmp(buf, L"ghcefijklmno", 12) );
  86
  87   fb.close();
  88 }
  89
  90 int main()
  91 {
  92   test01();
  93   return 0;
  94 }