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

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// 1999-10-11 bkoz
// Copyright (C) 1999, 2000 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 <streambuf>
#include <ostream>
#ifdef DEBUG_ASSERT
#include <assert.h>
#endif
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;
test &= this->eback() == NULL;
test &= this->gptr() == NULL;
test &= this->egptr() == NULL;
test &= this->pbase() == NULL;
test &= this->pptr() == NULL;
test &= 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
test &= buf01.check_pointers();
test &= 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));
test &= i01 == buf01.in_avail();
test &= buf01.pub_uflow() == lit01[0];
test &= buf01.sgetc() == traits_type::to_int_type(lit01[1]);
test &= buf01.pub_uflow() == lit01[1];
test &= buf01.sgetc() == traits_type::to_int_type(lit01[2]);
test &= buf01.pub_uflow() == lit01[2];
test &= buf01.sgetc() == traits_type::eof();
// pbackfail
buf01.pub_setg(lit01, lit01, (lit01 + i01));
test &= i01 == buf01.in_avail();
int_type intt01 = traits_type::to_int_type('b');
test &= traits_type::eof() == buf01.pub_pbackfail(intt01);
// overflow
test &= traits_type::eof() == buf01.pub_overflow(intt01);
test &= traits_type::eof() == buf01.pub_overflow();
test &= buf01.sgetc() == traits_type::to_int_type(lit01[0]);
// sputn/xsputn
char* lit02 = "isotope 217: the unstable molecule on thrill jockey";
int i02 = strlen(lit02);
char carray[i02 + 1];
memset(carray, 0, i02 + 1);
buf01.pub_setp(carray, (carray + i02));
buf01.sputn(lit02, 0);
test &= carray[0] == 0;
test &= lit02[0] == 'i';
buf01.sputn(lit02, 1);
test &= lit02[0] == carray[0];
test &= lit02[1] == 's';
test &= carray[1] == 0;
buf01.sputn(lit02 + 1, 10);
test &= memcmp(lit02, carray, 10) == 0;
buf01.sputn(lit02 + 11, 20);
test &= 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
test &= buf01.check_pointers();
test &= buf01.getloc() == std::locale();
// 27.5.2.2.5 Put area
size_t i01 = traits_type::length(lit01);
char carray01[i01];
memset(carray01, 0, i01);
buf01.pub_setg(lit01, lit01, lit01 + i01);
buf01.sgetn(carray01, 0);
test &= carray01[0] == 0;
buf01.sgetn(carray01, 1);
test &= carray01[0] == 'c';
buf01.sgetn(carray01 + 1, i01 - 1);
test &= carray01[0] == 'c';
test &= carray01[1] == 'h';
test &= carray01[i01 - 1] == 'k';
#ifdef DEBUG_ASSERT
assert(test);
#endif
}
// test03
// http://sourceware.cygnus.com/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");
test &= test01 == control01;
#ifdef DEBUG_ASSERT
assert(test);
#endif
}
int main()
{
test01();
test02();
test03();
return 0;
}