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

   1 // { dg-require-swprintf "" }
   2
   3 // Copyright (C) 2005-2020 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 3, 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 COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <cstdio> // for swprintf
  21 #include <iostream>
  22 #include <iomanip>
  23 #include <sstream>
  24 #include <limits>
  25 #include <testsuite_hooks.h>
  26
  27 void
  28 test02()
  29 {
  30   using namespace std;
  31
  32   // make sure we can output a very long float
  33   long double val = numeric_limits<long double>::max();
  34   int prec = numeric_limits<long double>::digits10;
  35
  36   wostringstream os;
  37   os.precision(prec);
  38   os.setf(wios::scientific);
  39   os << val;
  40
  41   wchar_t largebuf[512];
  42   swprintf(largebuf, 512, L"%.*Le", prec, val);
  43 #ifdef TEST_NUMPUT_VERBOSE
  44   wcout << "expect: " << largebuf << endl;
  45   wcout << "result: " << os.str() << endl;
  46 #endif
  47   VERIFY( os && os.str() == largebuf );
  48
  49   // Make sure we can output a long float in fixed format
  50   // without seg-faulting (libstdc++/4402)
  51   double val2 = numeric_limits<double>::max();
  52
  53   wostringstream os2;
  54   os2.precision(3);
  55   os2.setf(wios::fixed);
  56   os2 << val2;
  57
  58   swprintf(largebuf, 512, L"%.*f", 3, val2);
  59 #ifdef TEST_NUMPUT_VERBOSE
  60   wcout << "expect: " << largebuf << endl;
  61   wcout << "result: " << os2.str() << endl;
  62 #endif
  63   VERIFY( os2 && os2.str() == largebuf );
  64 }
  65
  66 int
  67 main()
  68 {
  69   test02();
  70   return 0;
  71 }