libstdc++-v3/testsuite/27_io/basic_istream/getline/wchar_t/5.cc

   1 // Copyright (C) 2004-2021 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_LENGTH=7" { target simulator } }
  21 // { dg-require-fileio "" }
  22
  23 #ifndef MAX_LENGTH
  24 #define MAX_LENGTH 777
  25 #endif
  26
  27 #include <istream>
  28 #include <string>
  29 #include <fstream>
  30 #include <cstdlib>
  31 #include <testsuite_hooks.h>
  32
  33 using namespace std;
  34
  35 wstring
  36 prepare(wstring::size_type len, unsigned nchunks, wchar_t delim)
  37 {
  38   wstring ret;
  39   for (unsigned i = 0; i < nchunks; ++i)
  40     {
  41       for (wstring::size_type j = 0; j < len; ++j)
  42         ret.push_back(L'a' + rand() % 26);
  43       len *= 2;
  44       ret.push_back(delim);
  45     }
  46   return ret;
  47 }
  48
  49 void
  50 check(wistream& stream, const wstring& str, unsigned nchunks, wchar_t delim)
  51 {
  52   static wchar_t buf[1000000];
  53   wstring::size_type index = 0, index_new = 0;
  54   unsigned n = 0;
  55
  56   while (stream.getline(buf, sizeof(buf) / sizeof(wchar_t), delim))
  57     {
  58       index_new = str.find(delim, index);
  59       VERIFY( static_cast<string::size_type>(stream.gcount()) ==
  60                index_new - index + 1 );
  61       VERIFY( !str.compare(index, index_new - index, buf) );
  62       index = index_new + 1;
  63       ++n;
  64     }
  65   VERIFY( stream.gcount() == 0 );
  66   VERIFY( stream.eof() );
  67   VERIFY( n == nchunks );
  68 }
  69
  70 void test01()
  71 {
  72   const char filename[] = "wistream_getline.txt";
  73
  74   const wchar_t delim = L'|';
  75   const unsigned nchunks = 10;
  76   const wstring data = prepare(MAX_LENGTH, nchunks, delim);
  77
  78   wofstream ofstrm;
  79   ofstrm.open(filename);
  80   ofstrm.write(data.data(), data.size());
  81   ofstrm.close();
  82
  83   wifstream ifstrm;
  84   ifstrm.open(filename);
  85   check(ifstrm, data, nchunks, delim);
  86   ifstrm.close();
  87 }
  88
  89 int main()
  90 {
  91   test01();
  92   return 0;
  93 }