libstdc++-v3/testsuite/27_io/basic_istream/getline/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 #include <cwchar> // for wcslen
  21 #include <istream>
  22 #include <sstream>
  23 #include <testsuite_hooks.h>
  24
  25 // [patch] bits/istream.tcc - getline(char_type*,streamsize,char_type)
  26 // http://gcc.gnu.org/ml/libstdc++/2000-07/msg00003.html
  27 void
  28 test05()
  29 {
  30   const wchar_t* charray = L"\n"
  31 L"a\n"
  32 L"aa\n"
  33 L"aaa\n"
  34 L"aaaa\n"
  35 L"aaaaa\n"
  36 L"aaaaaa\n"
  37 L"aaaaaaa\n"
  38 L"aaaaaaaa\n"
  39 L"aaaaaaaaa\n"
  40 L"aaaaaaaaaa\n"
  41 L"aaaaaaaaaaa\n"
  42 L"aaaaaaaaaaaa\n"
  43 L"aaaaaaaaaaaaa\n"
  44 L"aaaaaaaaaaaaaa\n";
  45
  46   const std::streamsize it = 5;
  47   std::streamsize br = 0;
  48   wchar_t tmp[it];
  49   std::wstringbuf sb(charray, std::ios_base::in);
  50   std::wistream ifs(&sb);
  51   std::streamsize blen = std::wcslen(charray);
  52   VERIFY(!(!ifs));
  53   while(ifs.getline(tmp, it) || ifs.gcount())
  54     {
  55       br += ifs.gcount();
  56       if(ifs.eof())
  57         {
  58           // Just sanity checks to make sure we've extracted the same
  59           // number of chars that were in the streambuf
  60           VERIFY( br == blen );
  61           // Also, we should only set the failbit if we could
  62           // _extract_ no chars from the stream, i.e. the first read
  63           // returned EOF.
  64           VERIFY( ifs.fail() && ifs.gcount() == 0 );
  65         }
  66       else if(ifs.fail())
  67         {
  68           // delimiter not read
  69           //
  70           // either
  71           // -> extracted no characters
  72           // or
  73           // -> n - 1 characters are stored
  74           ifs.clear(ifs.rdstate() & ~std::ios::failbit);
  75           VERIFY( (ifs.gcount() == 0) || (std::wcslen(tmp) == it - 1) );
  76           VERIFY( !(!ifs) );
  77           continue;
  78         }
  79       else
  80         {
  81           // delimiter was read.
  82           //
  83           // -> wcslen(__s) < n - 1
  84           // -> delimiter was seen -> gcount() > wcslen(__s)
  85           VERIFY( ifs.gcount() == static_cast<std::streamsize>(std::wcslen(tmp)
  86                                                                + 1) );
  87           continue;
  88         }
  89     }
  90 }
  91
  92 int
  93 main()
  94 {
  95   test05();
  96   return 0;
  97 }