libstdc++-v3/testsuite/27_io/basic_istream/extractors_other/char/9424-in.cc

   1 // 1999-10-11 bkoz
   2
   3 // Copyright (C) 1999-2018 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
  21 // 27.5.2 template class basic_streambuf
  22
  23 #include <cstring> // for memset, memcmp
  24 #include <streambuf>
  25 #include <sstream>
  26 #include <ostream>
  27 #include <testsuite_hooks.h>
  28
  29 // libstdc++/9424
  30 class Outbuf_2 : public std::streambuf
  31 {
  32   char buf[1];
  33
  34 public:
  35   Outbuf_2()
  36   {
  37     setp(buf, buf + 1);
  38   }
  39
  40   int_type overflow(int_type c)
  41   {
  42     int_type eof = traits_type::eof();
  43
  44     if (pptr() < epptr())
  45       {
  46         if (traits_type::eq_int_type(c, eof))
  47           return traits_type::not_eof(c);
  48
  49         *pptr() = traits_type::to_char_type(c);
  50         pbump(1);
  51         return c;
  52       }
  53
  54     return eof;
  55   }
  56 };
  57
  58 class Inbuf_2 : public std::streambuf
  59 {
  60   static const char buf[];
  61   const char* current;
  62   int size;
  63
  64 public:
  65   Inbuf_2()
  66   {
  67     current = buf;
  68     size = std::strlen(buf);
  69   }
  70
  71   int_type underflow()
  72   {
  73     if (current < buf + size)
  74       return traits_type::to_int_type(*current);
  75     return traits_type::eof();
  76   }
  77
  78   int_type uflow()
  79   {
  80     if (current < buf + size)
  81       return traits_type::to_int_type(*current++);
  82     return traits_type::eof();
  83   }
  84 };
  85
  86 const char Inbuf_2::buf[] = "Atteivlis";
  87
  88 void test11()
  89 {
  90   Inbuf_2 inbuf1;
  91   std::istream is(&inbuf1);
  92   Outbuf_2 outbuf1;
  93   is >> &outbuf1;
  94   VERIFY( inbuf1.sgetc() == 't' );
  95   VERIFY( is.good() );
  96 }
  97
  98 int main()
  99 {
 100   test11();
 101   return 0;
 102 }