libstdc++-v3/testsuite/27_io/basic_istream/extractors_character/char/4.cc

   1 // 2005-07-22  Paolo Carlini  <pcarlini@suse.de>
   2
   3 // Copyright (C) 2005-2022 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 // 27.6.1.2.3 basic_istream::operator>>
  21
  22 // { dg-do run { target { ! c++20 } } }
  23 // { dg-require-fileio "" }
  24
  25 #include <istream>
  26 #include <string>
  27 #include <fstream>
  28 #include <cstdlib>
  29 #include <cstring>
  30 #include <testsuite_hooks.h>
  31
  32 using namespace std;
  33
  34 string prepare(string::size_type len, unsigned nchunks)
  35 {
  36   string ret;
  37   for (unsigned i = 0; i < nchunks; ++i)
  38     {
  39       for (string::size_type j = 0; j < len; ++j)
  40         ret.push_back('a' + rand() % 26);
  41       len *= 2;
  42       ret.push_back(' ');
  43     }
  44   return ret;
  45 }
  46
  47 void check(istream& stream, const string& str, unsigned nchunks)
  48 {
  49   char* chunk = new char[str.size()];
  50   memset(chunk, 'X', str.size());
  51
  52   string::size_type index = 0, index_new = 0;
  53   unsigned n = 0;
  54
  55   while (stream >> chunk)
  56     {
  57       index_new = str.find(' ', index);
  58       VERIFY( !str.compare(index, index_new - index, chunk) );
  59       index = index_new + 1;
  60       ++n;
  61       memset(chunk, 'X', str.size());
  62     }
  63   VERIFY( stream.eof() );
  64   VERIFY( n == nchunks );
  65
  66   delete[] chunk;
  67 }
  68
  69 // istream& operator>>(istream&, charT*)
  70 void test01()
  71 {
  72   const char filename[] = "inserters_extractors-4.txt";
  73
  74   const unsigned nchunks = 10;
  75   const string data = prepare(666, nchunks);
  76
  77   ofstream ofstrm;
  78   ofstrm.open(filename);
  79   ofstrm.write(data.data(), data.size());
  80   ofstrm.close();
  81
  82   ifstream ifstrm;
  83   ifstrm.open(filename);
  84   check(ifstrm, data, nchunks);
  85   ifstrm.close();
  86 }
  87
  88 int main()
  89 {
  90   test01();
  91   return 0;
  92 }