102 lines
3.1 KiB
C++
102 lines
3.1 KiB
C++
// 2001-05-21 Benjamin Kosnik <bkoz@redhat.com>
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// Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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// USA.
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// 27.8.1.4 Overridden virtual functions
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// { dg-require-fileio "" }
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#include <fstream>
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#include <testsuite_hooks.h>
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// @require@ %-*.tst %-*.txt
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// @diff@ %-*.tst %*.txt
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// NB: This test assumes that _M_buf_size == 40, and not the usual
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// buffer_size length of BUFSIZ (8192), so that overflow/underflow can be
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// simulated a bit more readily.
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// NRB (Nota Really Bene): setting it to 40 breaks the test, as intended.
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const int buffer_size = 8192;
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//const int buffer_size = 40;
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const char name_01[] = "filebuf_virtuals-1.txt"; // file with data in it
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const char name_02[] = "filebuf_virtuals-2.txt"; // empty file, need to create
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const char name_03[] = "filebuf_virtuals-3.txt"; // empty file, need to create
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class derived_filebuf: public std::filebuf
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{
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public:
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void
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set_size(int_type __size) { _M_buf_size = __size; }
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};
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derived_filebuf fb_01; // in
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derived_filebuf fb_02; // out
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derived_filebuf fb_03; // in | out
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// Initialize filebufs to be the same size regardless of platform.
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void test03()
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{
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fb_01.set_size(buffer_size);
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fb_02.set_size(buffer_size);
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fb_03.set_size(buffer_size);
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}
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// Test overloaded virtual functions.
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void test05()
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{
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typedef std::filebuf::int_type int_type;
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typedef std::filebuf::traits_type traits_type;
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typedef std::filebuf::pos_type pos_type;
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typedef std::filebuf::off_type off_type;
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typedef size_t size_type;
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bool test __attribute__((unused)) = true;
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std::filebuf f_tmp;
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std::streamoff strmof_1, strmof_2;
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// GET
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// int in_avail()
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// if a read position is available, return _M_in_end - _M_in_cur.
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// else return showmanyc.
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strmof_1 = fb_01.in_avail();
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strmof_2 = fb_02.in_avail();
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VERIFY( strmof_1 == -1 );
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VERIFY( strmof_1 == strmof_2 ); //fail because not open
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strmof_1 = fb_03.in_avail();
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VERIFY( strmof_1 == strmof_2 );
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fb_01.open(name_01, std::ios_base::in);
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fb_02.open(name_02, std::ios_base::out | std::ios_base::trunc);
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fb_03.open(name_03, std::ios_base::out | std::ios_base::in | std::ios_base::trunc);
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strmof_1 = fb_01.in_avail();
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strmof_2 = fb_02.in_avail();
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VERIFY( strmof_1 != strmof_2 );
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VERIFY( strmof_1 >= 0 );
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VERIFY( strmof_2 == -1 ); // empty file
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strmof_1 = fb_03.in_avail();
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VERIFY( strmof_1 == 0 ); // empty file
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}
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int main()
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{
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test03();
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test05();
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return 0;
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}
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