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

   1 // 1999-04-12 bkoz
   2
   3 // Copyright (C) 1999-2020 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 // 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 void test12_aux(bool integer_type)
  33 {
  34   int digits_overflow;
  35   if (integer_type)
  36     // This many digits will overflow integer types in base 10.
  37     digits_overflow = std::numeric_limits<T>::digits10 + 2;
  38   else
  39     // This might do it, unsure.
  40     digits_overflow = std::numeric_limits<T>::max_exponent10 + 1;
  41
  42   std::string st;
  43   std::string part = "1234567890123456789012345678901234567890";
  44   for (std::size_t i = 0; i < digits_overflow / part.size() + 1; ++i)
  45     st += part;
  46   std::stringbuf sb(st);
  47   std::istream is(&sb);
  48   T t;
  49   is >> t;
  50   VERIFY(is.fail());
  51 }
  52
  53 void test12()
  54 {
  55   test12_aux<short>(true);
  56   test12_aux<int>(true);
  57   test12_aux<long>(true);
  58   test12_aux<float>(false);
  59   test12_aux<double>(false);
  60   test12_aux<long double>(false);
  61 }
  62
  63 int main()
  64 {
  65   test12();
  66   return 0;
  67 }