libstdc++-v3/testsuite/27_io/basic_istream/ignore/wchar_t/2.cc

   1 // Copyright (C) 2004-2020 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 // 27.6.1.3 unformatted input functions
  19
  20 // { dg-options "-DMAX_SIZE=355" { target simulator } }
  21 // { dg-require-fileio "" }
  22
  23 #ifndef MAX_SIZE
  24 #define MAX_SIZE 555
  25 #endif
  26
  27 #include <istream>
  28 #include <string>
  29 #include <fstream>
  30 #include <limits>
  31 #include <cstdlib>
  32 #include <testsuite_hooks.h>
  33
  34 using namespace std;
  35
  36 wstring
  37 prepare(wstring::size_type len, unsigned nchunks, wchar_t delim)
  38 {
  39   wstring ret;
  40   for (unsigned i = 0; i < nchunks; ++i)
  41     {
  42       for (wstring::size_type j = 0; j < len; ++j)
  43         ret.push_back(L'a' + rand() % 26);
  44       len *= 2;
  45       ret.push_back(delim);
  46     }
  47   return ret;
  48 }
  49
  50 void
  51 check(wistream& stream, const wstring& str, unsigned nchunks, wchar_t delim)
  52 {
  53   wstring::size_type index = 0, index_new = 0;
  54   unsigned n = 0;
  55
  56   while (stream.ignore(numeric_limits<streamsize>::max(), delim).good())
  57     {
  58       index_new = str.find(delim, index);
  59       VERIFY( static_cast<string::size_type>(stream.gcount()) ==
  60               index_new - index + 1 );
  61       index = index_new + 1;
  62       ++n;
  63     }
  64   VERIFY( stream.gcount() == 0 );
  65   VERIFY( !stream.fail() );
  66   VERIFY( n == nchunks );
  67 }
  68
  69 void test01()
  70 {
  71   const char filename[] = "wistream_ignore.txt";
  72
  73   const wchar_t delim = L'|';
  74   const unsigned nchunks = 10;
  75   const wstring data = prepare(MAX_SIZE, nchunks, delim);
  76
  77   wofstream ofstrm;
  78   ofstrm.open(filename);
  79   ofstrm.write(data.data(), data.size());
  80   ofstrm.close();
  81
  82   wifstream ifstrm;
  83   ifstrm.open(filename);
  84   check(ifstrm, data, nchunks, delim);
  85   ifstrm.close();
  86 }
  87
  88 int main()
  89 {
  90   test01();
  91   return 0;
  92 }