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// 2001-05-21 Benjamin Kosnik <bkoz@redhat.com>
// Copyright (C) 2001, 2002, 2003 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.
// 27.8.1.4 Overridden virtual functions
#include <fstream>
#include <testsuite_hooks.h>
#include <testsuite_io.h>
// @require@ %-*.tst %-*.txt
// @diff@ %-*.tst %*.txt
const char name_01[] = "sgetn.txt"; // file with data in it
// Test overloaded virtual functions.
void test05()
{
using namespace std;
using namespace __gnu_cxx_test;
typedef filebuf::int_type int_type;
typedef filebuf::traits_type traits_type;
bool test = true;
streamsize strmsz_1, strmsz_2, strmsz_3;
char carray1[13] = "";
char carray2[8192] = "";
char buffer[8192] = "";
int_type c1, c2, c3, c4;
// streamsize sgetn(char_type *s, streamsize n)
// streamsize xsgetn(char_type *s, streamsize n)
// assign up to n chars to s from input sequence, indexing in_cur as
// approp and returning the number of chars assigned
// in
{
constraint_filebuf fb_01;
// Need this since BUFSIZ is only guaranteed >= 255 and we want
// to trigger the same underflow situation everywhere.
fb_01.pubsetbuf(buffer, 8192);
fb_01.open(name_01, ios_base::in);
VERIFY( !fb_01.write_position() );
strmsz_1 = fb_01.in_avail(); // 8261
strmsz_2 = fb_01.sgetn(carray1, 10);
VERIFY( strmsz_2 == 10 );
strmsz_2 = fb_01.in_avail();
VERIFY( strmsz_1 > strmsz_2 );
c1 = fb_01.sgetc();
VERIFY( c1 == 'b' );
strmsz_1 = fb_01.in_avail();
strmsz_2 = fb_01.sgetn(carray2, strmsz_1 + 5);
VERIFY( strmsz_1 == strmsz_2 - 5 );
c4 = fb_01.sgetc(); // buffer should have underflowed from above.
VERIFY( c4 == 'h' );
strmsz_1 = fb_01.in_avail();
VERIFY( strmsz_1 > 0 );
strmsz_2 = fb_01.sgetn(carray2, strmsz_1 + 5);
VERIFY( strmsz_1 == strmsz_2 ); //at the end of the actual file
VERIFY( !fb_01.write_position() );
VERIFY( !fb_01.read_position() );
}
}
main()
{
test05();
return 0;
}
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