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

   1 // 2005-07-22  Paolo Carlini  <pcarlini@suse.de>
   2
   3 // Copyright (C) 2005-2024 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-options "-DMAX_SIZE=466" { target simulator } }
  23 // { dg-do run { target { ! c++20 } } }
  24 // { dg-require-fileio "" }
  25
  26 #ifndef MAX_SIZE
  27 #define MAX_SIZE 666
  28 #endif
  29
  30 #include <istream>
  31 #include <string>
  32 #include <fstream>
  33 #include <cstdlib>
  34 #include <testsuite_hooks.h>
  35
  36 using namespace std;
  37
  38 wstring prepare(wstring::size_type len, unsigned nchunks)
  39 {
  40   wstring ret;
  41   for (unsigned i = 0; i < nchunks; ++i)
  42     {
  43       for (wstring::size_type j = 0; j < len; ++j)
  44         ret.push_back(L'a' + rand() % 26);
  45       len *= 2;
  46       ret.push_back(L' ');
  47     }
  48   return ret;
  49 }
  50
  51 void check(wistream& stream, const wstring& str, unsigned nchunks)
  52 {
  53   wchar_t* chunk = new wchar_t[str.size()];
  54   wmemset(chunk, L'X', str.size());
  55
  56   wstring::size_type index = 0, index_new = 0;
  57   unsigned n = 0;
  58
  59   while (stream >> chunk)
  60     {
  61       index_new = str.find(' ', index);
  62       VERIFY( !str.compare(index, index_new - index, chunk) );
  63       index = index_new + 1;
  64       ++n;
  65       wmemset(chunk, L'X', str.size());
  66     }
  67   VERIFY( stream.eof() );
  68   VERIFY( n == nchunks );
  69
  70   delete[] chunk;
  71 }
  72
  73 // istream& operator>>(istream&, charT*)
  74 void test01()
  75 {
  76   const char filename[] = "inserters_extractors-4.txt";
  77
  78   const unsigned nchunks = 10;
  79   const wstring data = prepare(MAX_SIZE, nchunks);
  80
  81   wofstream ofstrm;
  82   ofstrm.open(filename);
  83   ofstrm.write(data.data(), data.size());
  84   ofstrm.close();
  85
  86   wifstream ifstrm;
  87   ifstrm.open(filename);
  88   check(ifstrm, data, nchunks);
  89   ifstrm.close();
  90 }
  91
  92 int main()
  93 {
  94   test01();
  95   return 0;
  96 }