libstdc++-v3/testsuite/27_io/basic_ostream/inserters_arithmetic/char/4402.cc

   1 // 1999-11-15 Kevin Ediger  <kediger@licor.com>
   2 // test the floating point inserters (facet num_put)
   3
   4 // Copyright (C) 1999, 2002, 2003, 2005 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 #include <cstdio> // for sprintf
  23 #include <iostream>
  24 #include <iomanip>
  25 #include <sstream>
  26 #include <limits>
  27 #include <testsuite_hooks.h>
  28
  29 void
  30 test02()
  31 {
  32   using namespace std;
  33   bool test __attribute__((unused)) = true;
  34
  35   // make sure we can output a very long float
  36   long double val = 1.2345678901234567890123456789e+1000L;
  37   int prec = numeric_limits<long double>::digits10;
  38
  39   ostringstream os;
  40   os.precision(prec);
  41   os.setf(ios::scientific);
  42   os << val;
  43
  44   char largebuf[512];
  45   sprintf(largebuf, "%.*Le", prec, val);
  46 #ifdef TEST_NUMPUT_VERBOSE
  47   cout << "expect: " << largebuf << endl;
  48   cout << "result: " << os.str() << endl;
  49 #endif
  50   VERIFY( os && os.str() == largebuf );
  51
  52   // Make sure we can output a long float in fixed format
  53   // without seg-faulting (libstdc++/4402)
  54   double val2 = 3.5e230;
  55
  56   ostringstream os2;
  57   os2.precision(3);
  58   os2.setf(ios::fixed);
  59   os2 << val2;
  60
  61   sprintf(largebuf, "%.*f", 3, val2);
  62 #ifdef TEST_NUMPUT_VERBOSE
  63   cout << "expect: " << largebuf << endl;
  64   cout << "result: " << os2.str() << endl;
  65 #endif
  66   VERIFY( os2 && os2.str() == largebuf );
  67 }
  68
  69 int
  70 main()
  71 {
  72   test02();
  73   return 0;
  74 }