stringbuf_members.cc

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

  strb_01.str(str_01); //reset
  strmsz_1 = strb_01.in_avail();
  strb_01.sbumpc();
  strb_01.sbumpc();
  c1 = strb_01.sgetc(); //"my'k'onos. . . or what?"
  c2 = strb_01.sputbackc('y');//"mykonos. . . or what?"
  c3 = strb_01.sgetc();
  VERIFY( c1 != c2 );
  VERIFY( c3 == c2 );
  VERIFY( c1 != c3 );
  VERIFY( strb_01.str() == str_01 );
  VERIFY( str_01.size() == strb_01.str().size() );
  //test for ios_base::out
  strmsz_2 = strb_03.in_avail();
  c4 = strb_03.sputbackc('x');
  VERIFY( c4 == traits_type::eof() );

  // int_type sungetc()
  // if in_cur not avail, return pbackfail(), else decrement and
  // return to_int_type(*gptr())
  for (int i = 0; i<12; ++i)
    strb_01.sbumpc();
  strmsz_1 = strb_01.in_avail();
  str_tmp = strb_01.str();
  c1 = strb_01.sgetc(); //"mykonos. . . 'o'r what?"
  c2 = strb_01.sungetc();//"mykonos. . . or what?"
  c3 = strb_01.sgetc();
  VERIFY( c1 != c2 );
  VERIFY( c3 == c2 );
  VERIFY( c1 != c3 );
  VERIFY( c2 == ' ' );
  VERIFY( strb_01.str() == str_01 );
  VERIFY( str_01.size() == strb_01.str().size() );
  //test for _in_cur == _in_beg
  strb_01.str(str_tmp);
  strmsz_1 = strb_01.in_avail();
  c1 = strb_01.sgetc(); //"'m'ykonos. . . or what?"
  c2 = strb_01.sungetc();//"mykonos. . . or what?"
  c3 = strb_01.sgetc();
  VERIFY( c1 != c2 );
  VERIFY( c3 != c2 );
  VERIFY( c1 == c3 );
  VERIFY( c2 == traits_type::eof() );
  VERIFY( strb_01.str() == str_01 );
  VERIFY( str_01.size() == strb_01.str().size() );
  // test for replacing char with identical one
  strb_01.str(str_01); //reset
  strmsz_1 = strb_01.in_avail();
  strb_01.sbumpc();
  strb_01.sbumpc();
  c1 = strb_01.sgetc(); //"my'k'onos. . . or what?"
  c2 = strb_01.sungetc();//"mykonos. . . or what?"
  c3 = strb_01.sgetc();
  VERIFY( c1 != c2 );
  VERIFY( c3 == c2 );
  VERIFY( c1 != c3 );
  VERIFY( strb_01.str() == str_01 );
  VERIFY( str_01.size() == strb_01.str().size() );
  //test for ios_base::out
  strmsz_2 = strb_03.in_avail();
  c4 = strb_03.sungetc();
  VERIFY( c4 == traits_type::eof() );

  // BUFFER MANAGEMENT & POSITIONING
  // sync
  // pubsync
  strb_01.pubsync();
  strb_02.pubsync();
  strb_03.pubsync();

  // setbuf
  // pubsetbuf(char_type* s, streamsize n)
  str_tmp = std::string("naaaah, go to cebu");
  strb_01.pubsetbuf(const_cast<char*> (str_tmp.c_str()), str_tmp.size());
  VERIFY( strb_01.str() == str_tmp );
  strb_01.pubsetbuf(0,0);
  VERIFY( strb_01.str() == str_tmp );

  // seekoff
  // pubseekoff(off_type off, ios_base::seekdir way, ios_base::openmode which)
  // alters the stream position to off
  pos_type pt_1(off_type(-1));
  pos_type pt_2(off_type(0));
  off_type off_1 = 0;
  off_type off_2 = 0;
  strb_01.str(str_01); //in|out ("mykonos. . . or what?");
  strb_02.str(str_02); //in ("paris, or sainte-maxime?");
  strb_03.str(str_03); //out ("")
  //IN|OUT
  //beg
  pt_1 = strb_01.pubseekoff(2, std::ios_base::beg);
  off_1 = pt_1;
  VERIFY( off_1 >= 0 );
  c1 = strb_01.snextc(); //current in pointer +1
  VERIFY( c1 == 'o' );
  c2 = strb_01.sputc('x');  //test current out pointer
  str_tmp = std::string("myxonos. . . or what?");
  VERIFY( strb_01.str() == str_tmp );
  //cur
  pt_1 = strb_01.pubseekoff(2, std::ios_base::cur);
  off_1 = pt_1;
  VERIFY( off_1 == -1 ); // can't seekoff for in and out + cur in sstreams
  pt_1 = strb_01.pubseekoff(2, std::ios_base::cur, std::ios_base::in);
  off_1 = pt_1;
  pt_2 = strb_01.pubseekoff(2, std::ios_base::cur, std::ios_base::in);
  off_2 = pt_2;
  VERIFY( off_2 == off_1 + 2 );
  c1 = strb_01.snextc(); //current in pointer + 1
  VERIFY( c1 == ' ' );
  c2 = strb_01.sputc('x');  //test current out pointer
  str_tmp = std::string("myxxnos. . . or what?");
  VERIFY( strb_01.str() == str_tmp );
  //end
  pt_2 = strb_01.pubseekoff(2, std::ios_base::end);
  off_1 = pt_2;
  VERIFY( off_1 == -1 ); // not a valid position
  VERIFY( strb_01.str() == str_tmp );
  // end part two (from the filebuf tests)
  strb_01.pubseekoff(0, std::ios_base::end);
  strmsz_1 = strb_01.in_avail(); // 0 cuz at the end
  c1 = strb_01.sgetc(); 
  c2 = strb_01.sungetc();
  strmsz_2 = strb_01.in_avail(); // 1
  c3 = strb_01.sgetc();
  VERIFY( c1 != c2 );
  VERIFY( strmsz_2 != strmsz_1 );
  VERIFY( strmsz_2 == 1 );
  // end part three
  strmsz_1 = strb_01.str().size();
  strmsz_2 = strb_01.sputn(" ravi shankar meets carlos santana in LoHa", 90);
  strb_01.pubseekoff(0, std::ios_base::end);
  strb_01.sputc('<');
  str_tmp = strb_01.str();
  VERIFY( str_tmp.size() == strmsz_1 + strmsz_2 + 1 );
  // IN
  // OUT

  // seekpos
  // pubseekpos(pos_type sp, ios_base::openmode)
  // alters the stream position to sp
  strb_01.str(str_01); //in|out ("mykonos. . . or what?");
  strb_02.str(str_02); //in ("paris, or sainte-maxime?");
  strb_03.str(str_03); //out ("")
  //IN|OUT
  //beg
  pt_1 = strb_01.pubseekoff(2, std::ios_base::beg);
  off_1 = pt_1;
  VERIFY( off_1 >= 0 );
  pt_1 = strb_01.pubseekoff(0, std::ios_base::cur, std::ios_base::out);
  off_1 = pt_1;
  c1 = strb_01.snextc(); //current in pointer +1
  VERIFY( c1 == 'o' );
  c2 = strb_01.sputc('x');  //test current out pointer
  str_tmp = std::string("myxonos. . . or what?");
  VERIFY( strb_01.str() == str_tmp );
  strb_01.pubsync(); //resets pointers
  pt_2 = strb_01.pubseekpos(pt_1, std::ios_base::in|std::ios_base::out);
  off_2 = pt_2;
  VERIFY( off_1 == off_2 );
  c3 = strb_01.snextc(); //current in pointer +1
  VERIFY( c1 == c3 );
  c2 = strb_01.sputc('x');  //test current out pointer
  str_tmp = std::string("myxonos. . . or what?");
  VERIFY( strb_01.str() == str_tmp );

  // VIRTUALS (indirectly tested)
  // underflow
  // if read position avail, returns *gptr()

  // pbackfail(int_type c)
  // put c back into input sequence

  // overflow
  // appends c to output seq

#ifdef DEBUG_ASSERT
  assert(test);
#endif

  return test;
}


// libstdc++/3955 -- ios_base::app overwrites from the beginning
bool test05()
{
  bool test = true;

  std::ostringstream os ("foo");
  os << "bar";

  test = os.str() == "bar";

#ifdef DEBUG_ASSERT
  assert(test);
#endif

  return test;
}

bool test06()
{
  bool test = true;

  std::ostringstream os ("foo", std::ios_base::app);
  os << "bar";

  test = os.str() == "foobar";

#ifdef DEBUG_ASSERT
  assert(test);
#endif

  return test;
}

// http://gcc.gnu.org/ml/libstdc++/2003-02/msg00269.html
// Growing and then seeking to ios_base::beg triggered a bug in str(),
// which didn't notice the grow.
bool test07()
{
  bool test = true;

  std::stringbuf strb_01;
  strb_01.sputc('s');
  strb_01.pubseekoff(0, std::ios_base::beg);
  VERIFY( strb_01.str() == "s" );

  std::string str("strivi,");
  std::stringbuf strb_02(str);
  strb_02.pubseekoff(0, std::ios_base::end);
  strb_02.sputn(" no better!", 11);
  strb_02.pubseekoff(0, std::ios_base::beg);
  VERIFY( strb_02.str() == "strivi, no better!" );

#ifdef DEBUG_ASSERT
  assert(test);
#endif

  return test;
}

int main()
{
  test01();
  test02();
  test03();
  test04();
  test05();
  test06();
  test07();

  return 0;
}



// more candy!!!