libstdc++-v3/testsuite/27_io/basic_stringbuf/sync/wchar_t/1057.cc

   1 // 1999-10-11 bkoz
   2
   3 // Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004
   4 // Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 2, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING.  If not, write to the Free
  19 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  20 // USA.
  21
  22 // As a special exception, you may use this file as part of a free software
  23 // library without restriction.  Specifically, if other files instantiate
  24 // templates or use macros or inline functions from this file, or you compile
  25 // this file and link it with other files to produce an executable, this
  26 // file does not by itself cause the resulting executable to be covered by
  27 // the GNU General Public License.  This exception does not however
  28 // invalidate any other reasons why the executable file might be covered by
  29 // the GNU General Public License.
  30
  31 // 27.5.2 template class basic_streambuf
  32
  33 #include <sstream>
  34 #include <testsuite_hooks.h>
  35
  36 class setpbuf : public std::wstringbuf
  37 {
  38   wchar_t       buffer[4];
  39   std::wstring  result;
  40
  41 public:
  42
  43   std::wstring&
  44   get_result()
  45   { return result; }
  46
  47   setpbuf()
  48   {
  49     wchar_t foo [32];
  50     setp(foo, foo + 32);
  51     setp(buffer, buffer + 4);
  52   }
  53
  54   ~setpbuf()
  55   { sync(); }
  56
  57   virtual int_type
  58   overflow(int_type n)
  59   {
  60     if (sync() != 0)
  61       return traits_type::eof();
  62
  63     result += traits_type::to_char_type(n);
  64
  65     return n;
  66   }
  67
  68   virtual int
  69   sync()
  70   {
  71     result.append(pbase(), pptr());
  72     setp(buffer, buffer + 4);
  73     return 0;
  74   }
  75 };
  76
  77 // libstdc++/1057
  78 void test04()
  79 {
  80   bool test __attribute__((unused)) = true;
  81   std::wstring text = L"abcdefghijklmn";
  82
  83   // 01
  84   setpbuf sp1;
  85   // Here xsputn writes over sp1.result
  86   sp1.sputn(text.c_str(), text.length());
  87
  88   // This crashes when result is accessed
  89   sp1.pubsync();
  90   VERIFY( sp1.get_result() == text );
  91
  92   // 02
  93   setpbuf sp2;
  94   for (std::wstring::size_type i = 0; i < text.length(); ++i)
  95     {
  96       // sputc also writes over result
  97       sp2.sputc(text[i]);
  98     }
  99
 100   // Crash here
 101   sp2.pubsync();
 102   VERIFY( sp2.get_result() == text );
 103 }
 104
 105 int main()
 106 {
 107   test04();
 108   return 0;
 109 }