libstdc++-v3/testsuite/27_io/basic_streambuf/overflow/char/1.cc

   1 // 1999-10-11 bkoz
   2
   3 // Copyright (C) 1999-2024 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 <streambuf>
  24 #include <cstring>
  25 #include <testsuite_hooks.h>
  26
  27 class testbuf : public std::streambuf
  28 {
  29 public:
  30
  31   // Typedefs:
  32   typedef std::streambuf::traits_type traits_type;
  33   typedef std::streambuf::char_type char_type;
  34
  35   testbuf(): std::streambuf()
  36   { }
  37
  38   void
  39   check_pointers()
  40   {
  41     VERIFY( !this->eback() );
  42     VERIFY( !this->gptr() );
  43     VERIFY( !this->egptr() );
  44     VERIFY( !this->pbase() );
  45     VERIFY( !this->pptr() );
  46     VERIFY( !this->epptr() );
  47   }
  48
  49   int_type
  50   pub_uflow()
  51   { return (this->uflow()); }
  52
  53   int_type
  54   pub_overflow(int_type __c = traits_type::eof())
  55   { return (this->overflow(__c)); }
  56
  57   int_type
  58   pub_pbackfail(int_type __c)
  59   { return (this->pbackfail(__c)); }
  60
  61   void
  62   pub_setg(char* beg, char* cur, char *end)
  63   { this->setg(beg, cur, end); }
  64
  65   void
  66   pub_setp(char* beg, char* end)
  67   { this->setp(beg, end); }
  68
  69 protected:
  70   int_type
  71   underflow()
  72   {
  73     int_type __retval = traits_type::eof();
  74     if (this->gptr() < this->egptr())
  75       __retval = traits_type::not_eof(0);
  76     return __retval;
  77   }
  78 };
  79
  80 void test01()
  81 {
  82   typedef testbuf::traits_type traits_type;
  83   typedef testbuf::int_type int_type;
  84
  85   char lit01[52];
  86   std::strcpy(lit01, "chicago underground trio/possible cube on delmark");
  87   testbuf buf01;
  88
  89   // pbackfail
  90   int i01 = 3;
  91   buf01.pub_setg(lit01, lit01, (lit01 + i01));
  92   VERIFY( i01 == buf01.in_avail() );
  93   int_type intt01 = traits_type::to_int_type('b');
  94   VERIFY( traits_type::eof() == buf01.pub_pbackfail(intt01) );
  95
  96   // overflow
  97   VERIFY( traits_type::eof() == buf01.pub_overflow(intt01) );
  98   VERIFY( traits_type::eof() == buf01.pub_overflow() );
  99   VERIFY( buf01.sgetc() == traits_type::to_int_type(lit01[0]) );
 100 }
 101
 102 int main()
 103 {
 104   test01();
 105   return 0;
 106 }