libstdc++-v3/testsuite/22_locale/codecvt/length/wchar_t/7.cc

   1 // { dg-require-namedlocale "en_US.UTF-8" }
   2
   3 // 2003-02-06  Petur Runolfsson  <peturr02@ru.is>
   4
   5 // Copyright (C) 2003-2019 Free Software Foundation, Inc.
   6 //
   7 // This file is part of the GNU ISO C++ Library.  This library is free
   8 // software; you can redistribute it and/or modify it under the
   9 // terms of the GNU General Public License as published by the
  10 // Free Software Foundation; either version 3, or (at your option)
  11 // any later version.
  12
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17
  18 // You should have received a copy of the GNU General Public License along
  19 // with this library; see the file COPYING3.  If not see
  20 // <http://www.gnu.org/licenses/>.
  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 //
  44 // Test handling of illegal input sequence in UTF-8.
  45 void test07()
  46 {
  47   using namespace std;
  48   typedef codecvt<wchar_t, char, mbstate_t>     w_codecvt;
  49   typedef wchar_t                               int_type;
  50   typedef char                                  ext_type;
  51
  52   const ext_type*       e_lit = "a\xc0\xff";
  53   int                   size = strlen(e_lit);
  54
  55   locale loc = locale("en_US.UTF-8");
  56   locale::global(loc);
  57   const w_codecvt*      cvt = &use_facet<w_codecvt>(loc);
  58
  59   w_codecvt::state_type state01;
  60   zero_state(state01);
  61   int i = cvt->length(state01, e_lit, e_lit + size, 1);
  62   VERIFY( i == 1 );
  63
  64   w_codecvt::state_type state02;
  65   zero_state(state02);
  66   int j = cvt->length(state02, e_lit, e_lit + size, size);
  67   VERIFY( j == 1 );
  68
  69   w_codecvt::state_type state03;
  70   zero_state(state03);
  71   int k = cvt->length(state03, e_lit, e_lit + size, size * 2);
  72   VERIFY( k == 1 );
  73 }
  74
  75 int main ()
  76 {
  77   test07();
  78   return 0;
  79 }