libstdc++-v3/testsuite/27_io/basic_streambuf/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 <streambuf>
  33 #include <testsuite_hooks.h>
  34
  35 class setpbuf : public std::streambuf
  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     char foo [32];
  49     setp(foo, foo + 32);
  50     setp(buffer, buffer + 4);
  51   }
  52
  53   ~setpbuf()
  54   { sync(); }
  55
  56   virtual int_type
  57   overflow(int_type n)
  58   {
  59     if (sync() != 0)
  60       return traits_type::eof();
  61
  62     result += traits_type::to_char_type(n);
  63
  64     return n;
  65   }
  66
  67   virtual int
  68   sync()
  69   {
  70     result.append(pbase(), pptr());
  71     setp(buffer, buffer + 4);
  72     return 0;
  73   }
  74 };
  75
  76 // libstdc++/1057
  77 void test04()
  78 {
  79   bool test __attribute__((unused)) = true;
  80   std::string text = "abcdefghijklmn";
  81
  82   // 01
  83   setpbuf sp1;
  84   // Here xsputn writes over sp1.result
  85   sp1.sputn(text.c_str(), text.length());
  86
  87   // This crashes when result is accessed
  88   sp1.pubsync();
  89   VERIFY( sp1.get_result() == text );
  90
  91   // 02
  92   setpbuf sp2;
  93   for (std::string::size_type i = 0; i < text.length(); ++i)
  94     {
  95       // sputc also writes over result
  96       sp2.sputc(text[i]);
  97     }
  98
  99   // Crash here
 100   sp2.pubsync();
 101   VERIFY( sp2.get_result() == text );
 102 }
 103
 104 int main()
 105 {
 106   test04();
 107   return 0;
 108 }