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

   1 // 1999-08-11 bkoz
   2
   3 // Copyright (C) 1999, 2000, 2001, 2002, 2003 Free Software Foundation
   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 2, 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 COPYING.  If not, write to the Free
  18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 // 27.6.1.3 unformatted input functions
  22
  23 #include <cstring> // for strlen
  24 #include <istream>
  25 #include <sstream>
  26 #include <testsuite_hooks.h>
  27
  28 // [patch] bits/istream.tcc - getline(char_type*,streamsize,char_type)
  29 // http://gcc.gnu.org/ml/libstdc++/2000-07/msg00003.html
  30 void
  31 test05()
  32 {
  33   const char* charray = "\n"
  34 "a\n"
  35 "aa\n"
  36 "aaa\n"
  37 "aaaa\n"
  38 "aaaaa\n"
  39 "aaaaaa\n"
  40 "aaaaaaa\n"
  41 "aaaaaaaa\n"
  42 "aaaaaaaaa\n"
  43 "aaaaaaaaaa\n"
  44 "aaaaaaaaaaa\n"
  45 "aaaaaaaaaaaa\n"
  46 "aaaaaaaaaaaaa\n"
  47 "aaaaaaaaaaaaaa\n";
  48
  49   bool test __attribute__((unused)) = true;
  50   const std::streamsize it = 5;
  51   std::streamsize br = 0;
  52   char tmp[it];
  53   std::stringbuf sb(charray, std::ios_base::in);
  54   std::istream ifs(&sb);
  55   std::streamsize blen = std::strlen(charray);
  56   VERIFY(!(!ifs));
  57   while(ifs.getline(tmp, it) || ifs.gcount())
  58     {
  59       br += ifs.gcount();
  60       if(ifs.eof())
  61         {
  62           // Just sanity checks to make sure we've extracted the same
  63           // number of chars that were in the streambuf
  64           VERIFY(br == blen);
  65           // Also, we should only set the failbit if we could
  66           // _extract_ no chars from the stream, i.e. the first read
  67           // returned EOF.
  68           VERIFY(ifs.fail() && ifs.gcount() == 0);
  69         }
  70       else if(ifs.fail())
  71         {
  72           // delimiter not read
  73           //
  74           // either
  75           // -> extracted no characters
  76           // or
  77           // -> n - 1 characters are stored
  78           ifs.clear(ifs.rdstate() & ~std::ios::failbit);
  79           VERIFY((ifs.gcount() == 0) || (std::strlen(tmp) == it - 1));
  80           VERIFY(!(!ifs));
  81           continue;
  82         }
  83       else
  84         {
  85           // delimiter was read.
  86           //
  87           // -> strlen(__s) < n - 1
  88           // -> delimiter was seen -> gcount() > strlen(__s)
  89           VERIFY(ifs.gcount() == static_cast<std::streamsize>(std::strlen(tmp) + 1) );
  90           continue;
  91         }
  92     }
  93 }
  94
  95 int
  96 main()
  97 {
  98   test05();
  99   return 0;
 100 }