sstream_test.cpp

stl的源码

#include <string>
#include "math_aux.h"

#if !defined (STLPORT) || !defined (_STLP_USE_NO_IOSTREAMS)
#  include <sstream>
#  include <memory>

#  include "full_streambuf.h"

#  include "cppunit/cppunit_proxy.h"

#  if !defined (STLPORT) || defined(_STLP_USE_NAMESPACES)
using namespace std;
#  endif

//
// TestCase class
//
class SstreamTest : public CPPUNIT_NS::TestCase
{
  CPPUNIT_TEST_SUITE(SstreamTest);
  CPPUNIT_TEST(output);
  CPPUNIT_TEST(input);
  CPPUNIT_TEST(input_char);
  CPPUNIT_TEST(io);
  CPPUNIT_TEST(err);
  CPPUNIT_TEST(err_long);
  CPPUNIT_TEST(maxint);
  CPPUNIT_TEST(init_in);
  CPPUNIT_TEST(init_out);
  CPPUNIT_TEST(buf);
  CPPUNIT_TEST(rdbuf);
  CPPUNIT_TEST(streambuf_output);
  CPPUNIT_TEST(seek);
  CPPUNIT_TEST(seekp);
  CPPUNIT_TEST(seek_gp);
  CPPUNIT_TEST(tellp);
  CPPUNIT_TEST(negative);
  CPPUNIT_TEST_SUITE_END();

  protected:
    void output();
    void input();
    void input_char();
    void io();
    void err();
    void err_long();
    void maxint();
    void init_in();
    void init_out();
    void buf();
    void rdbuf();
    void streambuf_output();
    void seek();
    void seekp();
    void seek_gp();
    void tellp();
    void negative();
};

CPPUNIT_TEST_SUITE_REGISTRATION(SstreamTest);

//
// tests implementation
//
void SstreamTest::output()
{
  {
    ostringstream s;

    s << 1 << '\n' << 2.0 << '\n' << "abcd\n" << "ghk lm\n" << "abcd ef";
    CPPUNIT_ASSERT( s.good() );
    CPPUNIT_ASSERT( s.str() == "1\n2\nabcd\nghk lm\nabcd ef" );
  }

  //Following tests are mostly used to reveal problem with the MSVC /Wp64 option
  //used to track 64 bits portability issue:
  {
    ostringstream s;
    size_t i = 0;
    s << i;
    CPPUNIT_ASSERT( s.good() );
    CPPUNIT_ASSERT( s.str() == "0" );
  }
  {
    ostringstream s;
    ptrdiff_t i = 0;
    s << i;
    CPPUNIT_ASSERT( s.good() );
    CPPUNIT_ASSERT( s.str() == "0" );
  }
}

void SstreamTest::input()
{
  {
    istringstream s( "1\n2\nabcd\nghk lm\nabcd ef" );
    int i = 0;
    s >> i;
    CPPUNIT_ASSERT( s.good() );
    CPPUNIT_ASSERT( i == 1 );
    double d = 0.0;
    s >> d;
    CPPUNIT_ASSERT( s.good() );
    CPPUNIT_ASSERT( d == 2.0 );
    string str;
    s >> str;
    CPPUNIT_ASSERT( s.good() );
    CPPUNIT_ASSERT( str == "abcd" );
    char c;
    s.get(c); // extract newline, that not extracted by operator >>
    CPPUNIT_ASSERT( s.good() );
    CPPUNIT_ASSERT( c == '\n' );
    getline( s, str );
    CPPUNIT_ASSERT( s.good() );
    CPPUNIT_ASSERT( str == "ghk lm" );
    getline( s, str );
    CPPUNIT_ASSERT( s.eof() );
    CPPUNIT_ASSERT( str == "abcd ef" );
  }
  {
    istringstream s("0");
    size_t i = 1;
    s >> i;
    CPPUNIT_ASSERT( !s.fail() );
    CPPUNIT_ASSERT( s.eof() );
    CPPUNIT_ASSERT( i == 0 );
  }
}

void SstreamTest::input_char()
{
  char buf[16] = { 0, '1', '2', '3' };
  istringstream s( "0" );
  s >> buf;

  CPPUNIT_ASSERT( buf[0] == '0' );
  CPPUNIT_ASSERT( buf[1] == 0 );
  CPPUNIT_ASSERT( buf[2] == '2' );
}


void SstreamTest::io()
{
  stringstream s;
  s << 1 << '\n' << 2.0 << '\n' << "abcd\n" << "ghk lm\n" << "abcd ef";
  CPPUNIT_ASSERT( s.good() );

  int i = 0;
  s >> i;
  CPPUNIT_ASSERT( i == 1 );
  CPPUNIT_ASSERT( s.good() );
  double d = 0.0;
  s >> d;
  CPPUNIT_ASSERT( d == 2.0 );
  CPPUNIT_ASSERT( s.good() );
  string str;
  s >> str;
  CPPUNIT_ASSERT( str == "abcd" );
  CPPUNIT_ASSERT( s.good() );
  char c;
  s.get(c); // extract newline, that not extracted by operator >>
  CPPUNIT_ASSERT( s.good() );
  CPPUNIT_ASSERT( c == '\n' );
  getline( s, str );
  CPPUNIT_ASSERT( s.good() );
  CPPUNIT_ASSERT( str == "ghk lm" );
  getline( s, str );
  CPPUNIT_ASSERT( str == "abcd ef" );
  CPPUNIT_ASSERT( s.eof() );
}

void SstreamTest::err()
{
  stringstream s( "9" );

  int i = 0;
  s >> i;
  CPPUNIT_ASSERT( !s.fail() );
  CPPUNIT_ASSERT( i == 9 );
  s >> i;
  CPPUNIT_ASSERT( s.fail() );
  CPPUNIT_ASSERT( s.eof() );
  CPPUNIT_ASSERT( i == 9 );
}

void SstreamTest::err_long()
{
  stringstream s( "9" );

  long i = 0;
  s >> i;
  CPPUNIT_ASSERT( !s.fail() );
  CPPUNIT_ASSERT( i == 9 );
  s >> i;
  CPPUNIT_ASSERT( s.fail() );
  CPPUNIT_ASSERT( s.eof() );
  CPPUNIT_ASSERT( i == 9 );
}

void SstreamTest::maxint()
{
  stringstream s;

  s << INT_MAX << " " << UINT_MAX << " " << LONG_MAX << " " << ULONG_MAX << " "
    << INT_MIN << " " << LONG_MIN;
  CPPUNIT_ASSERT( s.good() );

  int i = 0;
  unsigned int u = 0;
  long l = 0;
  unsigned long ul = 0;

  s >> i >> u >> l >> ul;
  CPPUNIT_ASSERT( s.good() );
  CPPUNIT_ASSERT( i == INT_MAX );
  CPPUNIT_ASSERT( u == UINT_MAX );
  CPPUNIT_ASSERT( l == LONG_MAX );
  CPPUNIT_ASSERT( ul == ULONG_MAX );

  s >> i >> l;
  CPPUNIT_ASSERT( !s.fail() );
  CPPUNIT_ASSERT( i == INT_MIN );
  CPPUNIT_ASSERT( l == LONG_MIN );
}

void SstreamTest::init_in()
{
  istringstream is( "12345" );
  int n;

  is >> n;
  CPPUNIT_ASSERT( !is.fail() );
  CPPUNIT_ASSERT( n == 12345 );

  istringstream dis( "1.2345" );
  double d;

  dis >> d;
  CPPUNIT_ASSERT( !dis.fail() );
  CPPUNIT_ASSERT( are_equals(d, 1.2345) );

  istringstream fis( "1.2345" );
  float f;

  fis >> f;
  CPPUNIT_ASSERT( !fis.fail() );
  CPPUNIT_ASSERT( are_equals(f, 1.2345f) );
}

void SstreamTest::init_out()
{
  ostringstream os( "12345" );
  CPPUNIT_ASSERT( os.str() == "12345" );

  os << 67;
  CPPUNIT_ASSERT( os.good() );

  // This satisfy to the Standard:
  // CPPUNIT_ASSERT( os.str() == "67345" );
  // But we don't know the reason, why standard state that.

  /*
   * 27.7.1.1: ... then copies the content of str into the basic_sringbuf
   * underlying character sequence and initializes the input and output
   * sequences according to which. If which & ios_base::out is true, initializes
   * the output sequence with underlying sequence. ...
   *
   * I can treat this as 'like output was performed', and then I should bump
   * put pointer... Looks like more useful then my previous treatment.
   *
   *          - ptr
   */

  CPPUNIT_ASSERT( os.str() == "1234567" );
  

  os.str( "89ab" );
  CPPUNIT_ASSERT( os.str() == "89ab" );

  os << 10;
  CPPUNIT_ASSERT( os.good() );
  // CPPUNIT_ASSERT( os.str() == "10ab" );
  CPPUNIT_ASSERT( os.str() == "89ab10" );
}

void SstreamTest::buf()
{
  stringstream ss;

  ss << "1234567\n89\n";
  char buf[10];
  buf[7] = 'x';
  ss.get( buf, 10 );
  CPPUNIT_ASSERT( !ss.fail() );
  CPPUNIT_ASSERT( buf[0] == '1' );
  CPPUNIT_ASSERT( buf[1] == '2' );
  CPPUNIT_ASSERT( buf[2] == '3' );
  CPPUNIT_ASSERT( buf[3] == '4' );
  CPPUNIT_ASSERT( buf[4] == '5' );
  CPPUNIT_ASSERT( buf[5] == '6' );
  CPPUNIT_ASSERT( buf[6] == '7' ); // 27.6.1.3 paragraph 10, paragraph 7
  CPPUNIT_ASSERT( buf[7] == 0 ); // 27.6.1.3 paragraph 8
  char c;
  ss.get(c);
  CPPUNIT_ASSERT( !ss.fail() );
  CPPUNIT_ASSERT( c == '\n' ); // 27.6.1.3 paragraph 10, paragraph 7
  ss.get(c);
  CPPUNIT_ASSERT( !ss.fail() );
  CPPUNIT_ASSERT( c == '8' );
}

void SstreamTest::rdbuf()
{
  stringstream ss;

  ss << "1234567\n89\n";

  ostringstream os;
  ss.get( *os.rdbuf(), '\n' );
  CPPUNIT_ASSERT( !ss.fail() );
  char c;
  ss.get(c);
  CPPUNIT_ASSERT( !ss.fail() );
  CPPUNIT_ASSERT( c == '\n' ); // 27.6.1.3 paragraph 12
  CPPUNIT_ASSERT( os.str() == "1234567" );
}

void SstreamTest::streambuf_output()
{
  {
    istringstream in("01234567890123456789");
    CPPUNIT_ASSERT( in );

    full_streambuf full_buf(10);
    ostream out(&full_buf);
    CPPUNIT_ASSERT( out );

    out << in.rdbuf();
    CPPUNIT_ASSERT( out );
    CPPUNIT_ASSERT( in );
    //out is good we can check what has been extracted:
    CPPUNIT_ASSERT( full_buf.str() == "0123456789" );

    out << in.rdbuf();
    CPPUNIT_ASSERT( out.fail() );
    CPPUNIT_ASSERT( in );

    ostringstream ostr;
    ostr << in.rdbuf();
    CPPUNIT_ASSERT( ostr );
    CPPUNIT_ASSERT( in );
    CPPUNIT_ASSERT( ostr.str() == "0123456789" );
  }

#  if !defined (STLPORT) || defined (_STLP_USE_EXCEPTIONS)
  {
    //If the output stream buffer throws:
    istringstream in("01234567890123456789");
    CPPUNIT_ASSERT( in );

    full_streambuf full_buf(10, true);
    ostream out(&full_buf);
    CPPUNIT_ASSERT( out );

    out << in.rdbuf();
    CPPUNIT_ASSERT( out.bad() );
    CPPUNIT_ASSERT( in );
    //out is bad we have no guaranty on what has been extracted:
    //CPPUNIT_ASSERT( full_buf.str() == "0123456789" );

    out.clear();
    out << in.rdbuf();
    CPPUNIT_ASSERT( out.fail() && out.bad() );
    CPPUNIT_ASSERT( in );

    ostringstream ostr;
    ostr << in.rdbuf();
    CPPUNIT_ASSERT( ostr );
    CPPUNIT_ASSERT( in );
    CPPUNIT_ASSERT( ostr.str() == "01234567890123456789" );
  }
#  endif
}

void SstreamTest::seek()
{
  stringstream s( "0123456789" );

  CPPUNIT_ASSERT( s.tellg() == stringstream::pos_type(0) );
  s.seekg( 6, ios::beg );
  CPPUNIT_ASSERT( s.tellg() == stringstream::pos_type(6) );
  s.seekg( -3, ios::cur );
  CPPUNIT_ASSERT( s.tellg() == stringstream::pos_type(3) );

  istringstream is( "0123456789" );
  CPPUNIT_ASSERT( is.tellg() == stringstream::pos_type(0) );
  is.seekg( 6, ios::beg );
  CPPUNIT_ASSERT( is.tellg() == stringstream::pos_type(6) );
  is.seekg( -3, ios::cur );
  CPPUNIT_ASSERT( is.tellg() == stringstream::pos_type(3) );
}

void SstreamTest::seekp()
{
  ostringstream s;

  s << "1234567";
  CPPUNIT_CHECK( s.tellp() == stringstream::pos_type(7) );
  CPPUNIT_CHECK( s.str() == "1234567" );
  s.seekp( 0 );
  s << "X";
  CPPUNIT_CHECK( s.str() == "X234567" );
  s.seekp( 0, ios::beg );
  s << "Y";
  CPPUNIT_CHECK( s.str() == "Y234567" );
}

void SstreamTest::seek_gp()
{
  stringstream ss( "1" );

  /* ISO/IEC 14882 2003 (and 1998 too) assume change as get as put positions
     with seekg and seekp (27.6.1.3, par 38; 27.6.2.4 par 2),
     but this contradict to common practice and proposed draft N2588
     (27.6.1.3, par 41; 27.6.2.5, par 4)

     Now STLport implement (i.e. change behaviour ) the draft's point of view.
   */

  ss.seekg( 0, ios::beg );
  ss.seekp( 0, ios::end );
  
  ss << "2";

  string str;

  ss >> str;

  /*  CPPUNIT_CHECK( str == "2" ); --- according ISO/IEC 14882 2003 */
  CPPUNIT_CHECK( str == "12" );
}

void SstreamTest::tellp()
{
  {
    ostringstream o( "1" );

    o << "23456";

    CPPUNIT_CHECK( o.rdbuf()->pubseekoff( 0, ios_base::cur, ios_base::out ) == stringstream::pos_type(6) );
    CPPUNIT_CHECK( o.tellp() == stringstream::pos_type(6) );
  }
  {
    ostringstream o;

    o << "123456";

    CPPUNIT_CHECK( o.rdbuf()->pubseekoff( 0, ios_base::cur, ios_base::out ) == stringstream::pos_type(6) );
    CPPUNIT_CHECK( o.tellp() == stringstream::pos_type(6) );
  }
  {
    ostringstream o( "1" );

    o << "23456789";

    CPPUNIT_CHECK( o.rdbuf()->pubseekoff( 0, ios_base::cur, ios_base::out ) == stringstream::pos_type(9) );
    CPPUNIT_CHECK( o.tellp() == stringstream::pos_type(9) );
  }
}


template < class T >
string to_string( const T& v )
{
  ostringstream oss;
  oss << v;
  return oss.str();
}

void SstreamTest::negative()
{
  CPPUNIT_CHECK( to_string<int>(-1) == "-1" );
  CPPUNIT_CHECK( to_string<long>(-1) == "-1" );
}

#endif