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

   1 // 1999-04-12 bkoz
   2
   3 // Copyright (C) 1999-2016 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 // 27.6.1.2.2 arithmetic extractors
  21
  22 // { dg-do run { xfail { lax_strtofp } } }
  23
  24 #include <istream>
  25 #include <sstream>
  26 #include <limits>
  27 #include <testsuite_hooks.h>
  28
  29 // libstdc++/3720
  30 // excess input should not cause a core dump
  31 template<typename T>
  32 bool test12_aux(bool integer_type)
  33 {
  34   bool test __attribute__((unused)) = true;
  35
  36   int digits_overflow;
  37   if (integer_type)
  38     // This many digits will overflow integer types in base 10.
  39     digits_overflow = std::numeric_limits<T>::digits10 + 2;
  40   else
  41     // This might do it, unsure.
  42     digits_overflow = std::numeric_limits<T>::max_exponent10 + 1;
  43
  44   std::string st;
  45   std::string part = "1234567890123456789012345678901234567890";
  46   for (std::size_t i = 0; i < digits_overflow / part.size() + 1; ++i)
  47     st += part;
  48   std::stringbuf sb(st);
  49   std::istream is(&sb);
  50   T t;
  51   is >> t;
  52   VERIFY(is.fail());
  53   return test;
  54 }
  55
  56 bool test12()
  57 {
  58   bool test __attribute__((unused)) = true;
  59   VERIFY(test12_aux<short>(true));
  60   VERIFY(test12_aux<int>(true));
  61   VERIFY(test12_aux<long>(true));
  62   VERIFY(test12_aux<float>(false));
  63   VERIFY(test12_aux<double>(false));
  64   VERIFY(test12_aux<long double>(false));
  65   return test;
  66 }
  67
  68 int main()
  69 {
  70   test12();
  71   return 0;
  72 }