libstdc++-v3/testsuite/22_locale/codecvt/length/wchar_t/6.cc

   1 // 2003-02-06  Petur Runolfsson  <peturr02@ru.is>
   2
   3 // Copyright (C) 2003-2014 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 // 22.2.1.5 - Template class codecvt [lib.locale.codecvt]
  21
  22 #include <locale>
  23 #include <cstring>
  24 #include <testsuite_hooks.h>
  25
  26 // Need to explicitly set the state(mbstate_t) to zero.
  27 // How to do this is not specified by the ISO C99 standard, so we
  28 // might need to add some operators to make the intuiative case
  29 // work:
  30 //   w_codecvt::state_type state00;
  31 //   state00 = 0;
  32 // or, can use this explicit "C" initialization:
  33 //   w_codecvt::state_type state01 = {0, 0};
  34 // .. except Ulrich says: Use memset. Always use memset. Feel the force...
  35 void
  36 zero_state(std::mbstate_t& state)
  37 { std::memset(&state, 0, sizeof(std::mbstate_t)); }
  38
  39 bool length_called = false;
  40
  41 class length_codecvt : public std::codecvt<wchar_t, char, std::mbstate_t>
  42 {
  43   typedef std::codecvt<wchar_t, char, std::mbstate_t> w_codecvt;
  44
  45 public:
  46   // DR75: type of first argument of do_length is state_type&
  47   virtual int do_length(state_type& state, const extern_type* from,
  48                         const extern_type* end, std::size_t max) const
  49   {
  50     length_called = true;
  51     return w_codecvt::do_length(state, from, end, max);
  52   }
  53 };
  54
  55 // Required instantiation
  56 // codecvt<wchar_t, char, mbstate_t>
  57 //
  58 // libstdc++/9224
  59 void test06()
  60 {
  61   using namespace std;
  62   typedef codecvt<wchar_t, char, mbstate_t>     w_codecvt;
  63   typedef char                                  ext_type;
  64
  65   bool test __attribute__((unused)) = true;
  66   const ext_type*       e_lit = "black pearl jasmine tea";
  67   int                   size = strlen(e_lit);
  68
  69   locale                loc;
  70   loc = locale(loc, new length_codecvt);
  71   const w_codecvt*      cvt = &use_facet<w_codecvt>(loc);
  72
  73   w_codecvt::state_type state04;
  74   zero_state(state04);
  75   length_called = false;
  76   cvt->length(state04, e_lit, e_lit + size, 5);
  77   VERIFY( length_called );
  78 }
  79
  80 int main ()
  81 {
  82   test06();
  83   return 0;
  84 }