filebuf_virtuals.cc

俄罗斯高人Mamaich的Pocket gcc编译器（运行在PocketPC上）的全部源代码。

  //beg
  strmsz_1 = fb_03.in_avail(); 
  pt_1 = fb_03.pubseekoff(2, std::ios_base::beg);
  strmsz_2 = fb_03.in_avail(); 
  off_1 = pt_1;
  VERIFY( off_1 > 0 );
  c1 = fb_03.snextc(); //current in pointer +1
  VERIFY( c1 == '3' );
  c2 = fb_03.sputc('\n');  //current in pointer +1
  c3 = fb_03.sgetc();
  VERIFY( c2 != c3 ); 
  VERIFY( c3 == '4' );
  fb_03.pubsync(); 
  c1 = fb_03.sgetc();
  VERIFY( c1 == c3 );
  //cur
  // 27filebuf-3.txt = bd2\n456789:;<=>?...
  pt_2 = fb_03.pubseekoff(2, std::ios_base::cur);
  off_2 = pt_2;
  VERIFY( (off_2 == (off_1 + 2 + 1 + 1)) );
  c1 = fb_03.snextc(); //current in pointer +1
  VERIFY( c1 == '7' );
  c2 = fb_03.sputc('x');  //test current out pointer
  c3 = fb_03.sputc('\n');
  c1 = fb_03.sgetc();
  fb_03.pubsync(); 
  c3 = fb_03.sgetc();
  VERIFY( c1 == c3 );
  //end
  // 27filebuf-3.txt = "bd2\n456x\n9" 
  pt_2 = fb_03.pubseekoff(0, std::ios_base::end, 
			  std::ios_base::in|std::ios_base::out);
  off_1 = pt_2;
  VERIFY( off_1 > off_2 ); //weak, but don't know exactly where it ends
  c3 = fb_03.sputc('\n');
  strmsz_1 = fb_03.sputn("because because because. . .", 28);  
  VERIFY( strmsz_1 == 28 );
  c1 = fb_03.sungetc();
  // Defect?  retval of sungetc is not necessarily the character ungotten.
  // So re-get it.
  c1 = fb_03.sgetc();
  fb_03.pubsync(); 
  c3 = fb_03.sgetc();
  VERIFY( c1 == c3 );
  // IN
  // OUT


  // seekpos
  // pubseekpos(pos_type sp, ios_base::openmode)
  // alters the stream position to sp
  //IN|OUT
  //beg
  pt_1 = fb_03.pubseekoff(78, std::ios_base::beg);
  off_1 = pt_1;
  VERIFY( off_1 > 0 );
  c1 = fb_03.snextc(); 		//current in pointer +1
  VERIFY( c1 == ' ' );
  c2 = fb_03.sputc('\n');  	//test current out pointer
  c3 = fb_03.sgetc();
  fb_03.pubsync(); 		//resets pointers
  pt_2 = fb_03.pubseekpos(pt_1);
  off_2 = pt_2;
  VERIFY( off_1 == off_2 );
  c3 = fb_03.snextc(); 		//current in pointer +1
  VERIFY( c2 == c3 );
  pt_1 = fb_03.pubseekoff(0, std::ios_base::end);
  off_1 = pt_1;
  VERIFY( off_1 > off_2 );
  fb_03.sputn("\nof the wonderful things he does!!\nok", 37);
  fb_03.pubsync();

  // IN
  // OUT

  // 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

  // NB Have to close these suckers. . .
  // filebuf_type* close()
  fb_01.close();
  fb_02.close();
  fb_03.close();
  VERIFY( !fb_01.is_open() );
  VERIFY( !fb_02.is_open() );
  VERIFY( !fb_03.is_open() );
}

void test06()
{
  using namespace std;
  typedef istream::int_type	int_type;

  bool test = true;
  ifstream ifs(name_02);
  char buffer[] = "xxxxxxxxxx";
  int_type len1 = ifs.rdbuf()->sgetn(buffer, sizeof(buffer));
  VERIFY( len1 == sizeof(buffer) );
  VERIFY( buffer[0] == 'a' );
}

// libstdc++/9322
void test07()
{
  using std::locale;
  bool test = true;

  locale loc;
  std::filebuf ob;
  VERIFY( ob.getloc() == loc );

  locale::global(locale("en_US"));
  VERIFY( ob.getloc() == loc );

  locale loc_de ("de_DE");
  locale ret = ob.pubimbue(loc_de);
  VERIFY( ob.getloc() == loc_de );
  VERIFY( ret == loc );

  locale::global(loc);
  VERIFY( ob.getloc() == loc_de );
}

class MyTraits : public std::char_traits<char>
{
public:
  static bool eq(char c1, char c2)
  {
    VERIFY( c1 != 'X' );
    VERIFY( c2 != 'X' );
    return std::char_traits<char>::eq(c1, c2);
  }
};

class MyBuf : public std::basic_streambuf<char, MyTraits>
{
  char buffer[8];

public:
  MyBuf()
  {
    std::memset(buffer, 'X', sizeof(buffer));
    std::memset(buffer + 2, 'f', 4);
    setg(buffer + 2, buffer + 2, buffer + 6);
  }
};

// libstdc++/9538
void test08()
{
  bool test = true;

  MyBuf mb;
  mb.sputbackc('a');  
}

// libstdc++/9439, libstdc++/9425
void test09()
{
  using namespace std;
  bool test = true;

  filebuf fbuf;
  fbuf.open(name_01, ios_base::in);
  filebuf::int_type r = fbuf.sputbackc('a');
  fbuf.close();

  VERIFY( r == filebuf::traits_type::eof() );
}

class Cvt_to_upper : public std::codecvt<char, char, mbstate_t>
{
  bool do_always_noconv() const throw()
  {
    return false;
  }
};

// libstdc++/9169
void test10()
{
  using namespace std;
  bool test = true;

  locale c_loc;
  locale loc(c_loc, new Cvt_to_upper);

  string str("abcdefghijklmnopqrstuvwxyz");
  string tmp;

  {
    ofstream out;
    out.imbue(loc);
    out.open(name_04);
    copy(str.begin(), str.end(),
	 ostreambuf_iterator<char>(out));
  }

  {
    ifstream in;
    in.open(name_04);
    copy(istreambuf_iterator<char>(in),
	 istreambuf_iterator<char>(),
	 back_inserter(tmp));
  }

  VERIFY( tmp.size() == str.size() );
  VERIFY( tmp == str );
}

// libstdc++/9825
void test11()
{
  using namespace std;
  bool test = true;

  filebuf fbuf;

  fbuf.open(name_05, ios_base::in|ios_base::out|ios_base::trunc);
  fbuf.sputn("crazy bees!", 11);
  fbuf.pubseekoff(0, ios_base::beg);
  fbuf.sbumpc();
  fbuf.sputbackc('x');
  filebuf::int_type c = fbuf.sbumpc();
  VERIFY( c == 'x' );
  c = fbuf.sbumpc();
  VERIFY( c == 'r' );
  c = fbuf.sbumpc();
  VERIFY( c == 'a' );
  fbuf.close();  
}

class errorcvt : public std::codecvt<char, char, mbstate_t>
{
protected:
  std::codecvt_base::result
  do_out(mbstate_t&, const char* from, const char*,
	 const char*& from_next, char* to, char*,
	 char*& to_next) const
  {
    from_next = from;
    to_next = to;
    return std::codecvt<char, char, mbstate_t>::error;
  }
  
  virtual bool do_always_noconv() const throw()
  {
    return false;
  }
};

// libstdc++/9182
void test12()
{
  using namespace std;
  bool test = true;

  locale loc;
  loc = locale(loc, new errorcvt);
  
  filebuf fbuf1;
  fbuf1.pubimbue(loc);
  fbuf1.open(name_06, ios_base::out | ios_base::trunc);
  fbuf1.sputn("ison", 4); 
  int r = fbuf1.pubsync();
  VERIFY( r == -1 );
  fbuf1.close();
}

void test13()
{
  using namespace std;
  bool test = true;
  
  locale loc;
  loc = locale(loc, new errorcvt);
  
  filebuf fbuf1;
  fbuf1.pubimbue(loc);
  fbuf1.pubsetbuf(0, 0);
  fbuf1.open(name_06, ios_base::out | ios_base::trunc);
  streamsize n = fbuf1.sputn("onne", 4);
  VERIFY( n == 0 );
  fbuf1.close();
}

class OverBuf : public std::filebuf
{
public:
  int_type pub_overflow(int_type c = traits_type::eof())
  { return std::filebuf::overflow(c); }
};

// libstdc++/9988
void test14()
{
  using namespace std;
  bool test = true;
  
  OverBuf fb;
  fb.open(name_07, ios_base::out | ios_base::trunc);
  
  fb.sputc('a');
  fb.pub_overflow('b');
  fb.pub_overflow();
  fb.sputc('c');
  fb.close();

  filebuf fbin;
  fbin.open(name_07, ios_base::in);
  filebuf::int_type c;
  c = fbin.sbumpc();
  VERIFY( c == 'a' );
  c = fbin.sbumpc();
  VERIFY( c == 'b' );
  c = fbin.sbumpc();
  VERIFY( c == 'c' );
  c = fbin.sbumpc();
  VERIFY( c == filebuf::traits_type::eof() );
  fbin.close();
}

class UnderBuf : public std::filebuf
{
public:
  int_type
  pub_underflow()
  { return underflow(); }

  std::streamsize
  pub_showmanyc()
  { return showmanyc(); }
};

// libstdc++/10097
void test15()
{
  using namespace std;
  bool test = true;

  const char* name = "tmp_fifo1";
  
  signal(SIGPIPE, SIG_IGN);
  unlink(name);
  
  if (0 != mkfifo(name, S_IRWXU))
    {
      VERIFY( false );
    }
  
  int fval = fork();
  if (fval == -1)
    {
      unlink(name);
      VERIFY( false );
    }
  else if (fval == 0)
    {
      filebuf fbout;
      fbout.open(name, ios_base::out);
      fbout.sputn("0123456789", 10);
      fbout.pubsync();
      sleep(2);
      fbout.close();
      exit(0);
    }

  UnderBuf fb;
  fb.open(name, ios_base::in);
  sleep(1);
  
  fb.sgetc();
  streamsize n = fb.pub_showmanyc();

  while (n > 0)
    {
      --n;
      
      UnderBuf::int_type c = fb.pub_underflow();
      VERIFY( c != UnderBuf::traits_type::eof() );
      
      fb.sbumpc();
    }

  fb.close();
}

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

  test07();
  test08();
  test09();
  test10();
  test11();
  test12();
  test13();
  test14();
  test15();
  return 0;
}