libstdc++-v3/testsuite/27_io/basic_filebuf/sync/char/1057.cc

   1 // 1999-10-11 bkoz
   2
   3 // Copyright (C) 1999-2013 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
  21 // 27.5.2 template class basic_streambuf
  22
  23 #include <fstream>
  24 #include <testsuite_hooks.h>
  25
  26 class setpbuf : public std::filebuf
  27 {
  28   char          buffer[4];
  29   std::string   result;
  30
  31 public:
  32
  33   std::string&
  34   get_result()
  35   { return result; }
  36
  37   setpbuf()
  38   {
  39     this->open("tmp_1057", std::ios_base::out | std::ios_base::trunc);
  40     char foo [32];
  41     setp(foo, foo + 32);
  42     setp(buffer, buffer + 4);
  43   }
  44
  45   ~setpbuf()
  46   {
  47     sync();
  48     close();
  49   }
  50
  51   virtual int_type
  52   overflow(int_type n)
  53   {
  54     if (sync() != 0)
  55       return traits_type::eof();
  56
  57     result += traits_type::to_char_type(n);
  58
  59     return n;
  60   }
  61
  62   virtual int
  63   sync()
  64   {
  65     result.append(pbase(), pptr());
  66     setp(buffer, buffer + 4);
  67     return 0;
  68   }
  69 };
  70
  71 // libstdc++/1057
  72 void test04()
  73 {
  74   bool test __attribute__((unused)) = true;
  75   std::string text = "abcdefghijklmn";
  76
  77   // 01
  78   setpbuf sp1;
  79   // Here xsputn writes over sp1.result
  80   sp1.sputn(text.c_str(), text.length());
  81
  82   // This crashes when result is accessed
  83   sp1.pubsync();
  84   VERIFY( sp1.get_result() == text );
  85
  86   // 02
  87   setpbuf sp2;
  88   for (std::string::size_type i = 0; i < text.length(); ++i)
  89     {
  90       // sputc also writes over result
  91       sp2.sputc(text[i]);
  92     }
  93
  94   // Crash here
  95   sp2.pubsync();
  96   VERIFY( sp2.get_result() == text );
  97 }
  98
  99 int main()
 100 {
 101   test04();
 102   return 0;
 103 }