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gcc/libstdc++-v3/testsuite/27_io/streambuf.cc

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// 1999-10-11 bkoz
// Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
//
// 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.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
// 27.5.2 template class basic_streambuf
#include <cstring> // for memset, memcmp
#include <streambuf>
#include <string>
#include <ostream>
#include <debug_assert.h>
class testbuf : public std::streambuf
{
public:
// Typedefs:
typedef std::streambuf::traits_type traits_type;
typedef std::streambuf::char_type char_type;
testbuf(): std::streambuf()
{ _M_mode = (std::ios_base::in | std::ios_base::out); }
bool
check_pointers()
{
bool test = true;
VERIFY( this->eback() == NULL );
VERIFY( this->gptr() == NULL );
VERIFY( this->egptr() == NULL );
VERIFY( this->pbase() == NULL );
VERIFY( this->pptr() == NULL );
VERIFY( this->epptr() == NULL );
return test;
}
int_type
pub_uflow()
{ return (this->uflow()); }
int_type
pub_overflow(int_type __c = traits_type::eof())
{ return (this->overflow(__c)); }
int_type
pub_pbackfail(int_type __c)
{ return (this->pbackfail(__c)); }
void
pub_setg(char* beg, char* cur, char *end)
{ this->setg(beg, cur, end); }
void
pub_setp(char* beg, char* end)
{ this->setp(beg, end); }
protected:
int_type
underflow()
{
int_type __retval = traits_type::eof();
if (this->gptr() < this->egptr())
__retval = traits_type::not_eof(0);
return __retval;
}
};
void test01()
{
typedef testbuf::traits_type traits_type;
typedef testbuf::int_type int_type;
bool test = true;
char* lit01 = "chicago underground trio/possible cube on delmark";
testbuf buf01;
// 27.5.2.1 basic_streambuf ctors
// default ctor initializes
// - all pointer members to null pointers
// - locale to current global locale
VERIFY( buf01.check_pointers() );
VERIFY( buf01.getloc() == std::locale() );
// 27.5.2.3.1 get area
// 27.5.2.2.3 get area
// 27.5.2.4.3 get area
int i01 = 3;
buf01.pub_setg(lit01, lit01, (lit01 + i01));
VERIFY( i01 == buf01.in_avail() );
VERIFY( buf01.pub_uflow() == lit01[0] );
VERIFY( buf01.sgetc() == traits_type::to_int_type(lit01[1]) );
VERIFY( buf01.pub_uflow() == lit01[1] );
VERIFY( buf01.sgetc() == traits_type::to_int_type(lit01[2]) );
VERIFY( buf01.pub_uflow() == lit01[2] );
VERIFY( buf01.sgetc() == traits_type::eof() );
// pbackfail
buf01.pub_setg(lit01, lit01, (lit01 + i01));
VERIFY( i01 == buf01.in_avail() );
int_type intt01 = traits_type::to_int_type('b');
VERIFY( traits_type::eof() == buf01.pub_pbackfail(intt01) );
// overflow
VERIFY( traits_type::eof() == buf01.pub_overflow(intt01) );
VERIFY( traits_type::eof() == buf01.pub_overflow() );
VERIFY( buf01.sgetc() == traits_type::to_int_type(lit01[0]) );
// sputn/xsputn
char* lit02 = "isotope 217: the unstable molecule on thrill jockey";
int i02 = std::strlen(lit02);
char carray[i02 + 1];
std::memset(carray, 0, i02 + 1);
buf01.pub_setp(carray, (carray + i02));
buf01.sputn(lit02, 0);
VERIFY( carray[0] == 0 );
VERIFY( lit02[0] == 'i' );
buf01.sputn(lit02, 1);
VERIFY( lit02[0] == carray[0] );
VERIFY( lit02[1] == 's' );
VERIFY( carray[1] == 0 );
buf01.sputn(lit02 + 1, 10);
VERIFY( std::memcmp(lit02, carray, 10) == 0 );
buf01.sputn(lit02 + 11, 20);
VERIFY( std::memcmp(lit02, carray, 30) == 0 );
#ifdef DEBUG_ASSERT
assert(test);
#endif
}
void test02()
{
typedef testbuf::traits_type traits_type;
typedef testbuf::int_type int_type;
bool test = true;
char* lit01 = "chicago underground trio/possible cube on delmark";
testbuf buf01;
// 27.5.2.1 basic_streambuf ctors
// default ctor initializes
// - all pointer members to null pointers
// - locale to current global locale
VERIFY( buf01.check_pointers() );
VERIFY( buf01.getloc() == std::locale() );
// 27.5.2.2.5 Put area
size_t i01 = traits_type::length(lit01);
char carray01[i01];
std::memset(carray01, 0, i01);
buf01.pub_setg(lit01, lit01, lit01 + i01);
buf01.sgetn(carray01, 0);
VERIFY( carray01[0] == 0 );
buf01.sgetn(carray01, 1);
VERIFY( carray01[0] == 'c' );
buf01.sgetn(carray01 + 1, i01 - 1);
VERIFY( carray01[0] == 'c' );
VERIFY( carray01[1] == 'h' );
VERIFY( carray01[i01 - 1] == 'k' );
#ifdef DEBUG_ASSERT
assert(test);
#endif
}
// test03
// http://gcc.gnu.org/ml/libstdc++/2000-q1/msg00151.html
template<typename charT, typename traits = std::char_traits<charT> >
class basic_nullbuf : public std::basic_streambuf<charT, traits>
{
protected:
virtual int_type
overflow(int_type c)
{ return traits::not_eof(c); }
};
typedef basic_nullbuf<char> nullbuf;
typedef basic_nullbuf<wchar_t> wnullbuf;
template<typename T>
char
print(const T& x)
{
nullbuf ob;
std::ostream out(&ob);
out << x << std::endl;
return (!out ? '0' : '1');
}
void test03()
{
bool test = true;
const std::string control01("11111");
std::string test01;
test01 += print(true);
test01 += print(3.14159);
test01 += print(10);
test01 += print('x');
test01 += print("pipo");
VERIFY( test01 == control01 );
#ifdef DEBUG_ASSERT
assert(test);
#endif
}
class setpbuf : public std::streambuf
{
char buffer[4];
std::string result;
public:
std::string&
get_result()
{ return result; }
setpbuf()
{
char foo [32];
setp(foo, foo + 32);
setp(buffer, buffer + 4);
}
~setpbuf()
{ sync(); }
virtual int_type
overflow(int_type n)
{
if (sync() != 0)
return traits_type::eof();
result += traits_type::to_char_type(n);
return n;
}
virtual int
sync()
{
result.append(pbase(), pptr());
setp(buffer, buffer + 4);
return 0;
}
};
// libstdc++/1057
void test04()
{
bool test = true;
std::string text = "abcdefghijklmn";
// 01
setpbuf sp1;
// Here xsputn writes over sp1.result
sp1.sputn(text.c_str(), text.length());
// This crashes when result is accessed
sp1.pubsync();
VERIFY( sp1.get_result() == text );
// 02
setpbuf sp2;
for (std::string::size_type i = 0; i < text.length(); ++i)
{
// sputc also writes over result
sp2.sputc(text[i]);
}
// Crash here
sp2.pubsync();
VERIFY( sp2.get_result() == text );
}
class nullsetpbuf : public std::streambuf
{
char foo[64];
public:
nullsetpbuf()
{
setp(foo, foo + 64);
setp(NULL, NULL);
}
};
// libstdc++/1057
void test05()
{
std::string text1 = "abcdefghijklmn";
nullsetpbuf nsp;
// Immediate crash as xsputn writes to null pointer
nsp.sputn(text1.c_str(), text1.length());
// ditto
nsp.sputc('a');
}
// test06
// XXX this should work, doesn't due to compiler limitations.
#if 0
namespace gnu
{
class something_derived;
}
class gnu::something_derived : std::streambuf { };
#endif
int main()
{
test01();
test02();
test03();
test04();
test05();
return 0;
}
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