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) 1999-2016 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 3, 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 COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <cstdio> // for sprintf
  22 #include <iostream>
  23 #include <iomanip>
  24 #include <sstream>
  25 #include <limits>
  26 #include <testsuite_hooks.h>
  27
  28 void
  29 test02()
  30 {
  31   using namespace std;
  32   bool test __attribute__((unused)) = true;
  33
  34   // make sure we can output a very long float
  35   long double val = numeric_limits<long double>::max();
  36   int prec = numeric_limits<long double>::digits10;
  37
  38   ostringstream os;
  39   os.precision(prec);
  40   os.setf(ios::scientific);
  41   os << val;
  42
  43   char largebuf[512];
  44   sprintf(largebuf, "%.*Le", prec, val);
  45 #ifdef TEST_NUMPUT_VERBOSE
  46   cout << "expect: " << largebuf << endl;
  47   cout << "result: " << os.str() << endl;
  48 #endif
  49   VERIFY( os && os.str() == largebuf );
  50
  51   // Make sure we can output a long float in fixed format
  52   // without seg-faulting (libstdc++/4402)
  53   double val2 = numeric_limits<double>::max();
  54
  55   ostringstream os2;
  56   os2.precision(3);
  57   os2.setf(ios::fixed);
  58   os2 << val2;
  59
  60   sprintf(largebuf, "%.*f", 3, val2);
  61 #ifdef TEST_NUMPUT_VERBOSE
  62   cout << "expect: " << largebuf << endl;
  63   cout << "result: " << os2.str() << endl;
  64 #endif
  65   VERIFY( os2 && os2.str() == largebuf );
  66 }
  67
  68 int
  69 main()
  70 {
  71   test02();
  72   return 0;
  73 }