ostream_inserter_other.cc

gcc-you can use this code to learn something about gcc, and inquire further into linux,

// 1999-08-16 bkoz
// 1999-11-01 bkoz

// Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation
//
// 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 2, 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 COPYING.  If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.

// 27.6.2.5.4 basic_ostream character inserters
// @require@ %-*.tst %-*.txt
// @diff@ %-*.tst %-*.txt

#include <ostream>
#include <sstream>
#include <fstream>
#include <testsuite_hooks.h>

const int size = 1000;
const char name_01[] = "ostream_inserter_other-1.tst";
const char name_02[] = "ostream_inserter_other-1.txt";
const char name_03[] = "ostream_inserter_other-2.tst";
const char name_04[] = "ostream_inserter_other-2.txt";


// stringstream
int 
test01() 
{
  bool test = true;
#ifdef DEBUG_ASSERT
  assert(test);
#endif
  return 0;
}

// fstream
int
test02() 
{
  typedef std::ios_base::iostate iostate;
  bool test = true;

  // basic_ostream<_CharT, _Traits>::operator<<(__streambuf_type* __sb)
  // filebuf-> NULL 
  std::ifstream f_in1(name_01);
  std::ofstream f_out1(name_02);
  std::stringbuf* strbuf01 = NULL;
  iostate state01 = f_in1.rdstate();
  f_in1 >> strbuf01;
  iostate state02 = f_in1.rdstate();
  VERIFY( state01 != state02 );
  VERIFY( (state02 & std::ios_base::failbit) != 0 );
  state01 = f_out1.rdstate();
  f_out1 << strbuf01;
  state02 = f_out1.rdstate();
  VERIFY( state01 != state02 );
  VERIFY( (state02 & std::ios_base::badbit) != 0 );

  // filebuf->filebuf
  std::ifstream f_in(name_01);
  std::ofstream f_out(name_02);
  f_out << f_in.rdbuf();
  f_in.close();
  f_out.close();

  // filebuf->stringbuf->filebuf
  std::ifstream f_in2(name_03);
  std::ofstream f_out2(name_04); // should be different name
  std::stringbuf strbuf02;
  f_in2 >> &strbuf02;
  f_out2 << &strbuf02;
  f_in2.close();
  f_out2.close();

  // no characters inserted

#ifdef DEBUG_ASSERT
  assert(test);
#endif
  
  return 0;
}

// via Brent Verner <[e-mail]>
// http://gcc.gnu.org/ml/libstdc++/2000-06/msg00005.html
int
test03(void)
{
  using namespace std;

  typedef ios::pos_type 	pos_type;

  const char* TEST_IN = "ostream_inserter_other_in";
  const char* TEST_OUT = "ostream_inserter_other_out";
  pos_type i_read, i_wrote, rs, ws;
  double tf_size = BUFSIZ * 2.5;
  ofstream testfile(TEST_IN);

  for (int i = 0; i < tf_size; ++i)
    testfile.put('.');
  testfile.close();

  ifstream in(TEST_IN);
  ofstream out(TEST_OUT);
  out << in.rdbuf();
  in.seekg(0,ios_base::beg);
  out.seekp(0,ios_base::beg);
  rs = in.tellg();
  ws = out.tellp();
  in.seekg(0,ios_base::end);
  out.seekp(0,ios_base::end);
  i_read = in.tellg() - rs;
  i_wrote = out.tellp() - ws;
  in.close();
  out.close();
  
#ifdef DEBUG_ASSERT
  assert(i_read == i_wrote);
#endif

  return 0;
}

// libstdc++/3272
void test04()
{
  using namespace std;
  bool test = true;
  istringstream istr("inside betty carter");
  ostringstream ostr;
  ostr << istr.rdbuf() << endl;

  if (ostr.rdstate() & ios_base::eofbit) 
    test = false;

  VERIFY( test );
}


class test_buffer_1 : public std::streambuf 
{
public:
  test_buffer_1(const std::string& s) : str(s), it(str.begin()) { }
  
protected:
  virtual int underflow() { return (it != str.end() ? *it : EOF); }
  virtual int uflow() { return (it != str.end() ? *it++ : EOF); }

private:
  const std::string str;
  std::string::const_iterator it;
};


class test_buffer_2 : public std::streambuf 
{
public:
  test_buffer_2(const std::string& s) : str(s), it(str.begin()) { }
  
protected:
  virtual int underflow() { return (it != str.end() ? *it : EOF); }
  virtual int uflow() { return (it != str.end() ? *it++ : EOF); }
  virtual std::streamsize showmanyc() { return std::distance(it, str.end()); }
private:
  const std::string str;
  std::string::const_iterator it;
};


class test_buffer_3 : public std::streambuf 
{
public:
  test_buffer_3(const std::string& s) : str(s), it(str.begin()) { }

protected:
  virtual int underflow() { return (it != str.end() ? *it : EOF); }
  virtual int uflow() { return (it != str.end() ? *it++ : EOF); }
  virtual std::streamsize showmanyc() 
  {
    std::streamsize ret = std::distance(it, str.end());
    return ret > 0 ? ret : -1;
  }
private:
  const std::string str;
  std::string::const_iterator it;
};

class test_buffer_4 : public std::streambuf {
public:
  test_buffer_4(const std::string& s) : str(s), it(str.begin())
  {
    if (it != str.end()) {
      buf[0] = *it++;
      setg(buf, buf, buf+1);
    }
  }

protected:
  virtual int underflow() { return (it != str.end() ? *it : EOF); }
  virtual int uflow() { return (it != str.end() ? *it++ : EOF); }
  virtual std::streamsize showmanyc() {
    std::streamsize ret = std::distance(it, str.end());
    return ret > 0 ? ret : -1;
  }
private:
  const std::string str;
  std::string::const_iterator it;
  char buf[1];
};

void test(const std::string& str, std::streambuf& buf)
{
  bool test = true;

  std::ostringstream out;
  std::istream in(&buf);

  out << in.rdbuf();

  if (out.str() != str) 
    VERIFY( false );
}

// libstdc++/6745
// libstdc++/8071
// libstdc++/8127
// Jonathan Lennox  <[e-mail]>
void test05()
{
  std::string string_a("Hello, world!");
  std::string string_b("");

  test_buffer_1 buf1a(string_a);
  test_buffer_1 buf1b(string_b);

  test_buffer_2 buf2a(string_a);
  test_buffer_2 buf2b(string_b);

  test_buffer_3 buf3a(string_a);
  test_buffer_3 buf3b(string_b);

  test_buffer_4 buf4a(string_a);
  test_buffer_4 buf4b(string_b);

  test(string_a, buf1a);
  test(string_b, buf1b);

  test(string_a, buf2a);
  test(string_b, buf2b);

  test(string_a, buf3a);
  test(string_b, buf3b);

  test(string_a, buf4a);
  test(string_b, buf4b);
}

int 
main()
{
  test01();
  test02();
  test03();
  test04();
  
  test05();
  return 0;
}