libstdc++-v3/testsuite/27_io/basic_istream/read/char/1.cc

   1 // 1999-08-11 bkoz
   2
   3 // Copyright (C) 1999-2022 Free Software Foundation, Inc.
   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 3, 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 COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 // 27.6.1.3 unformatted input functions
  21
  22 #include <cstring> // for strncmp,...
  23 #include <istream>
  24 #include <sstream>
  25 #include <testsuite_hooks.h>
  26
  27 void
  28 test01()
  29 {
  30   const std::string str_02("soul eyes: john coltrane quartet");
  31
  32   std::stringbuf isbuf_03(str_02, std::ios_base::in);
  33   std::stringbuf isbuf_04(str_02, std::ios_base::in);
  34
  35   std::istream is_00(0);
  36   std::istream is_03(&isbuf_03);
  37   std::istream is_04(&isbuf_04);
  38   std::ios_base::iostate state1, state2, statefail, stateeof;
  39   statefail = std::ios_base::failbit;
  40   stateeof = std::ios_base::eofbit;
  41
  42   // istream& read(char_type* s, streamsize n)
  43   char carray[60] = "";
  44   state1 = is_04.rdstate();
  45   is_04.read(carray, 0);
  46   state2 = is_04.rdstate();
  47   VERIFY( state1 == state2 );
  48
  49   state1 = is_04.rdstate();
  50   is_04.read(carray, 9);
  51   state2 = is_04.rdstate();
  52   VERIFY( state1 == state2 );
  53   VERIFY( !std::strncmp(carray, "soul eyes", 9) );
  54   VERIFY( is_04.peek() == ':' );
  55
  56   state1 = is_03.rdstate();
  57   is_03.read(carray, 60);
  58   state2 = is_03.rdstate();
  59   VERIFY( state1 != state2 );
  60   VERIFY( static_cast<bool>(state2 & stateeof) );
  61   VERIFY( static_cast<bool>(state2 & statefail) );
  62   VERIFY( !std::strncmp(carray, "soul eyes: john coltrane quartet", 35) );
  63 }
  64
  65 int
  66 main()
  67 {
  68   test01();
  69   return 0;
  70 }