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

   1 // 1999-10-11 bkoz
   2
   3 // Copyright (C) 1999, 2000, 2001, 2002, 2003 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 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 // 27.5.2 template class basic_streambuf
  31
  32 #include <fstream>
  33 #include <testsuite_hooks.h>
  34
  35 class setpbuf : public std::filebuf
  36 {
  37   char          buffer[4];
  38   std::string   result;
  39
  40 public:
  41
  42   std::string&
  43   get_result()
  44   { return result; }
  45
  46   setpbuf()
  47   {
  48     this->open("tmp_1057", std::ios_base::out | std::ios_base::trunc);
  49     char foo [32];
  50     setp(foo, foo + 32);
  51     setp(buffer, buffer + 4);
  52   }
  53
  54   ~setpbuf()
  55   {
  56     sync();
  57     close();
  58   }
  59
  60   virtual int_type
  61   overflow(int_type n)
  62   {
  63     if (sync() != 0)
  64       return traits_type::eof();
  65
  66     result += traits_type::to_char_type(n);
  67
  68     return n;
  69   }
  70
  71   virtual int
  72   sync()
  73   {
  74     result.append(pbase(), pptr());
  75     setp(buffer, buffer + 4);
  76     return 0;
  77   }
  78 };
  79
  80 // libstdc++/1057
  81 void test04()
  82 {
  83   bool test __attribute__((unused)) = true;
  84   std::string text = "abcdefghijklmn";
  85
  86   // 01
  87   setpbuf sp1;
  88   // Here xsputn writes over sp1.result
  89   sp1.sputn(text.c_str(), text.length());
  90
  91   // This crashes when result is accessed
  92   sp1.pubsync();
  93   VERIFY( sp1.get_result() == text );
  94
  95   // 02
  96   setpbuf sp2;
  97   for (std::string::size_type i = 0; i < text.length(); ++i)
  98     {
  99       // sputc also writes over result
 100       sp2.sputc(text[i]);
 101     }
 102
 103   // Crash here
 104   sp2.pubsync();
 105   VERIFY( sp2.get_result() == text );
 106 }
 107
 108 int main()
 109 {
 110   test04();
 111   return 0;
 112 }