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, 2009
   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 3, 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 COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  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 // Required instantiation
  41 // codecvt<wchar_t, char, mbstate_t>
  42 void test01()
  43 {
  44   using namespace std;
  45   typedef codecvt<wchar_t, char, mbstate_t>     w_codecvt;
  46   typedef codecvt_base::result                  result;
  47   typedef wchar_t                               int_type;
  48   typedef char                                  ext_type;
  49
  50   bool test __attribute__((unused)) = true;
  51   const ext_type*       e_lit = "black pearl jasmine tea";
  52   int                   size = strlen(e_lit);
  53   ext_type*             e_arr = new ext_type[size + 1];
  54   ext_type*             eto_next;
  55
  56   locale                loc;
  57   const w_codecvt*      cvt = &use_facet<w_codecvt>(loc);
  58
  59   // unshift
  60   strcpy(e_arr, e_lit);
  61   w_codecvt::state_type state03;
  62   zero_state(state03);
  63   result r3 = cvt->unshift(state03, e_arr, e_arr + size, eto_next);
  64   VERIFY( r3 == codecvt_base::noconv );
  65   VERIFY( !strcmp(e_arr, e_lit) );
  66   VERIFY( eto_next == e_arr );
  67
  68   delete [] e_arr;
  69 }
  70
  71 int main ()
  72 {
  73   test01();
  74   return 0;
  75 }