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[thirdparty/gcc.git] / libstdc++-v3 / testsuite / 22_locale / codecvt / unshift / wchar_t / 1.cc

// 2000-08-17 Benjamin Kosnik <bkoz@cygnus.com>

// Copyright (C) 2000-2022 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.

// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3.  If not see
// <http://www.gnu.org/licenses/>.

// 22.2.1.5 - Template class codecvt [lib.locale.codecvt]

#include <locale>
#include <cstring>
#include <testsuite_hooks.h>

// Need to explicitly set the state(mbstate_t) to zero.
// How to do this is not specified by the ISO C99 standard, so we
// might need to add some operators to make the intuiative case
// work:
//   w_codecvt::state_type state00;
//   state00 = 0;  
// or, can use this explicit "C" initialization:
//   w_codecvt::state_type state01 = {0, 0};
// .. except Ulrich says: Use memset. Always use memset. Feel the force...
void
zero_state(std::mbstate_t& state)
{ std::memset(&state, 0, sizeof(std::mbstate_t)); }

// Required instantiation
// codecvt<wchar_t, char, mbstate_t>
void test01()
{
  using namespace std;
  typedef codecvt<wchar_t, char, mbstate_t> 	w_codecvt;
  typedef codecvt_base::result			result;
  typedef wchar_t				int_type;
  typedef char					ext_type;

  const ext_type* 	e_lit = "black pearl jasmine tea";
  int 			size = strlen(e_lit);
  ext_type* 		e_arr = new ext_type[size + 1];
  ext_type*		eto_next;

  locale 		loc;
  const w_codecvt* 	cvt = &use_facet<w_codecvt>(loc); 

  // unshift
  strcpy(e_arr, e_lit);
  w_codecvt::state_type state03;
  zero_state(state03);
  result r3 = cvt->unshift(state03, e_arr, e_arr + size, eto_next);
  VERIFY( r3 == codecvt_base::noconv );
  VERIFY( !strcmp(e_arr, e_lit) ); 
  VERIFY( eto_next == e_arr );

  delete [] e_arr;
}

int main ()
{
  test01();
  return 0;
}