libstdc++-v3/testsuite/27_io/basic_istream/extractors_arithmetic/wchar_t/12.cc

   1 // Copyright (C) 2004-2021 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // 27.6.1.2.2 arithmetic extractors
  19
  20 // { dg-do run { xfail { lax_strtofp } } }
  21
  22 #include <istream>
  23 #include <sstream>
  24 #include <limits>
  25 #include <testsuite_hooks.h>
  26
  27 // libstdc++/3720
  28 // excess input should not cause a core dump
  29 template<typename T>
  30 void test12_aux(bool integer_type)
  31 {
  32   int digits_overflow;
  33   if (integer_type)
  34     // This many digits will overflow integer types in base 10.
  35     digits_overflow = std::numeric_limits<T>::digits10 + 2;
  36   else
  37     // This might do it, unsure.
  38     digits_overflow = std::numeric_limits<T>::max_exponent10 + 1;
  39
  40   std::wstring st;
  41   std::wstring part = L"1234567890123456789012345678901234567890";
  42   for (std::size_t i = 0; i < digits_overflow / part.size() + 1; ++i)
  43     st += part;
  44   std::wstringbuf sb(st);
  45   std::wistream is(&sb);
  46   T t;
  47   is >> t;
  48   VERIFY( is.fail() );
  49 }
  50
  51 void test12()
  52 {
  53   test12_aux<short>(true);
  54   test12_aux<int>(true);
  55   test12_aux<long>(true);
  56   test12_aux<float>(false);
  57   test12_aux<double>(false);
  58   test12_aux<long double>(false);
  59 }
  60
  61 int main()
  62 {
  63   test12();
  64   return 0;
  65 }