libstdc++-v3/testsuite/27_io/basic_istream/getline/char/2.cc

   1 // 1999-08-11 bkoz
   2
   3 // Copyright (C) 1999-2018 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 // 27.6.1.3 unformatted input functions
  21
  22 #include <cstring> // for strlen
  23 #include <istream>
  24 #include <sstream>
  25 #include <testsuite_hooks.h>
  26
  27 // [patch] bits/istream.tcc - getline(char_type*,streamsize,char_type)
  28 // http://gcc.gnu.org/ml/libstdc++/2000-07/msg00003.html
  29 void
  30 test05()
  31 {
  32   const char* charray = "\n"
  33 "a\n"
  34 "aa\n"
  35 "aaa\n"
  36 "aaaa\n"
  37 "aaaaa\n"
  38 "aaaaaa\n"
  39 "aaaaaaa\n"
  40 "aaaaaaaa\n"
  41 "aaaaaaaaa\n"
  42 "aaaaaaaaaa\n"
  43 "aaaaaaaaaaa\n"
  44 "aaaaaaaaaaaa\n"
  45 "aaaaaaaaaaaaa\n"
  46 "aaaaaaaaaaaaaa\n";
  47
  48   const std::streamsize it = 5;
  49   std::streamsize br = 0;
  50   char tmp[it];
  51   std::stringbuf sb(charray, std::ios_base::in);
  52   std::istream ifs(&sb);
  53   std::streamsize blen = std::strlen(charray);
  54   VERIFY(!(!ifs));
  55   while(ifs.getline(tmp, it) || ifs.gcount())
  56     {
  57       br += ifs.gcount();
  58       if(ifs.eof())
  59         {
  60           // Just sanity checks to make sure we've extracted the same
  61           // number of chars that were in the streambuf
  62           VERIFY(br == blen);
  63           // Also, we should only set the failbit if we could
  64           // _extract_ no chars from the stream, i.e. the first read
  65           // returned EOF.
  66           VERIFY(ifs.fail() && ifs.gcount() == 0);
  67         }
  68       else if(ifs.fail())
  69         {
  70           // delimiter not read
  71           //
  72           // either
  73           // -> extracted no characters
  74           // or
  75           // -> n - 1 characters are stored
  76           ifs.clear(ifs.rdstate() & ~std::ios::failbit);
  77           VERIFY((ifs.gcount() == 0) || (std::strlen(tmp) == it - 1));
  78           VERIFY(!(!ifs));
  79           continue;
  80         }
  81       else
  82         {
  83           // delimiter was read.
  84           //
  85           // -> strlen(__s) < n - 1
  86           // -> delimiter was seen -> gcount() > strlen(__s)
  87           VERIFY(ifs.gcount() == static_cast<std::streamsize>(std::strlen(tmp) + 1) );
  88           continue;
  89         }
  90     }
  91 }
  92
  93 int
  94 main()
  95 {
  96   test05();
  97   return 0;
  98 }