libstdc++-v3/testsuite/22_locale/codecvt/unshift/wchar_t/1.cc

   1 // 2000-08-17 Benjamin Kosnik <bkoz@cygnus.com>
   2
   3 // Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
   4 // Free Software Foundation
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 2, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING.  If not, write to the Free
  19 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  20 // USA.
  21
  22 // 22.2.1.5 - Template class codecvt [lib.locale.codecvt]
  23
  24 #include <locale>
  25 #include <cstring>
  26 #include <testsuite_hooks.h>
  27
  28 // Need to explicitly set the state(mbstate_t) to zero.
  29 // How to do this is not specified by the ISO C99 standard, so we
  30 // might need to add some operators to make the intuiative case
  31 // work:
  32 //   w_codecvt::state_type state00;
  33 //   state00 = 0;
  34 // or, can use this explicit "C" initialization:
  35 //   w_codecvt::state_type state01 = {0, 0};
  36 // .. except Ulrich says: Use memset. Always use memset. Feel the force...
  37 void
  38 zero_state(std::mbstate_t& state)
  39 { std::memset(&state, 0, sizeof(std::mbstate_t)); }
  40
  41 // Required instantiation
  42 // codecvt<wchar_t, char, mbstate_t>
  43 void test01()
  44 {
  45   using namespace std;
  46   typedef codecvt<wchar_t, char, mbstate_t>     w_codecvt;
  47   typedef codecvt_base::result                  result;
  48   typedef wchar_t                               int_type;
  49   typedef char                                  ext_type;
  50
  51   bool test __attribute__((unused)) = true;
  52   const ext_type*       e_lit = "black pearl jasmine tea";
  53   int                   size = strlen(e_lit);
  54   ext_type*             e_arr = new ext_type[size + 1];
  55   ext_type*             eto_next;
  56
  57   locale                loc;
  58   const w_codecvt*      cvt = &use_facet<w_codecvt>(loc);
  59
  60   // unshift
  61   strcpy(e_arr, e_lit);
  62   w_codecvt::state_type state03;
  63   zero_state(state03);
  64   result r3 = cvt->unshift(state03, e_arr, e_arr + size, eto_next);
  65   VERIFY( r3 == codecvt_base::noconv );
  66   VERIFY( !strcmp(e_arr, e_lit) );
  67   VERIFY( eto_next == e_arr );
  68
  69   delete [] e_arr;
  70 }
  71
  72 int main ()
  73 {
  74   test01();
  75   return 0;
  76 }