| // 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, |
| // USA. |
| |
| // 27.8.1.4 Overridden virtual functions |
| |
| #include <fstream> |
| #include <testsuite_hooks.h> |
| |
| // @require@ %-*.tst %-*.txt |
| // @diff@ %-*.tst %*.txt |
| |
| // NB: This test assumes that _M_buf_size == 40, and not the usual |
| // buffer_size length of BUFSIZ (8192), so that overflow/underflow can be |
| // simulated a bit more readily. |
| // NRB (Nota Really Bene): setting it to 40 breaks the test, as intended. |
| const int buffer_size = 8192; |
| //const int buffer_size = 40; |
| |
| const char name_01[] = "filebuf_virtuals-1.txt"; // file with data in it |
| const char name_02[] = "filebuf_virtuals-2.txt"; // empty file, need to create |
| const char name_03[] = "filebuf_virtuals-3.txt"; // empty file, need to create |
| |
| class derived_filebuf: public std::filebuf |
| { |
| public: |
| void |
| set_size(int_type __size) { _M_buf_size = __size; } |
| }; |
| |
| derived_filebuf fb_01; // in |
| derived_filebuf fb_02; // out |
| derived_filebuf fb_03; // in | out |
| |
| // Initialize filebufs to be the same size regardless of platform. |
| void test03() |
| { |
| fb_01.set_size(buffer_size); |
| fb_02.set_size(buffer_size); |
| fb_03.set_size(buffer_size); |
| } |
| |
| // Test overloaded virtual functions. |
| void test05() |
| { |
| typedef std::filebuf::int_type int_type; |
| typedef std::filebuf::traits_type traits_type; |
| typedef std::filebuf::pos_type pos_type; |
| typedef std::filebuf::off_type off_type; |
| typedef size_t size_type; |
| |
| bool test __attribute__((unused)) = true; |
| std::filebuf f_tmp; |
| std::streamoff strmof_1, strmof_2; |
| |
| // GET |
| // int in_avail() |
| // if a read position is available, return _M_in_end - _M_in_cur. |
| // else return showmanyc. |
| strmof_1 = fb_01.in_avail(); |
| strmof_2 = fb_02.in_avail(); |
| VERIFY( strmof_1 == -1 ); |
| VERIFY( strmof_1 == strmof_2 ); //fail because not open |
| strmof_1 = fb_03.in_avail(); |
| VERIFY( strmof_1 == strmof_2 ); |
| fb_01.open(name_01, std::ios_base::in); |
| fb_02.open(name_02, std::ios_base::out | std::ios_base::trunc); |
| fb_03.open(name_03, std::ios_base::out | std::ios_base::in | std::ios_base::trunc); |
| strmof_1 = fb_01.in_avail(); |
| strmof_2 = fb_02.in_avail(); |
| VERIFY( strmof_1 != strmof_2 ); |
| VERIFY( strmof_1 >= 0 ); |
| VERIFY( strmof_2 == -1 ); // empty file |
| strmof_1 = fb_03.in_avail(); |
| VERIFY( strmof_1 == 0 ); // empty file |
| } |
| |
| int main() |
| { |
| test03(); |
| test05(); |
| return 0; |
| } |