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, 2004, 2005, 2006, 2007 Free Software Foundation
   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 2, 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 COPYING.  If not, write to the Free
  18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  19 // USA.
  20
  21 // 22.2.1.5 - Template class codecvt [lib.locale.codecvt]
  22
  23 #include <locale>
  24 #include <cstring>
  25 #include <testsuite_hooks.h>
  26
  27 // Need to explicitly set the state(mbstate_t) to zero.
  28 // How to do this is not specified by the ISO C99 standard, so we
  29 // might need to add some operators to make the intuiative case
  30 // work:
  31 //   w_codecvt::state_type state00;
  32 //   state00 = 0;
  33 // or, can use this explicit "C" initialization:
  34 //   w_codecvt::state_type state01 = {0, 0};
  35 // .. except Ulrich says: Use memset. Always use memset. Feel the force...
  36 void
  37 zero_state(std::mbstate_t& state)
  38 { std::memset(&state, 0, sizeof(std::mbstate_t)); }
  39
  40 bool length_called = false;
  41
  42 class length_codecvt : public std::codecvt<wchar_t, char, std::mbstate_t>
  43 {
  44   typedef std::codecvt<wchar_t, char, std::mbstate_t> w_codecvt;
  45
  46 public:
  47   // DR75: type of first argument of do_length is state_type&
  48   virtual int do_length(state_type& state, const extern_type* from,
  49                         const extern_type* end, std::size_t max) const
  50   {
  51     length_called = true;
  52     return w_codecvt::do_length(state, from, end, max);
  53   }
  54 };
  55
  56 // Required instantiation
  57 // codecvt<wchar_t, char, mbstate_t>
  58 //
  59 // libstdc++/9224
  60 void test06()
  61 {
  62   using namespace std;
  63   typedef codecvt<wchar_t, char, mbstate_t>     w_codecvt;
  64   typedef char                                  ext_type;
  65
  66   bool test __attribute__((unused)) = true;
  67   const ext_type*       e_lit = "black pearl jasmine tea";
  68   int                   size = strlen(e_lit);
  69
  70   locale                loc;
  71   loc = locale(loc, new length_codecvt);
  72   const w_codecvt*      cvt = &use_facet<w_codecvt>(loc);
  73
  74   w_codecvt::state_type state04;
  75   zero_state(state04);
  76   length_called = false;
  77   cvt->length(state04, e_lit, e_lit + size, 5);
  78   VERIFY( length_called );
  79 }
  80
  81 int main ()
  82 {
  83   test06();
  84   return 0;
  85 }