| // 2001-05-21 Benjamin Kosnik <bkoz@redhat.com> |
| |
| // Copyright (C) 2001-2013 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 3, 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 COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| // 27.8.1.4 Overridden virtual functions |
| |
| // { dg-require-fileio "" } |
| |
| #include <fstream> |
| #include <testsuite_hooks.h> |
| #include <testsuite_io.h> |
| |
| // @require@ %-*.tst %-*.txt |
| // @diff@ %-*.tst %*.txt |
| |
| const char name_01[] = "tmp_sungetc_2io.tst"; // empty file, need to create |
| |
| void test01() |
| { |
| using namespace std; |
| using namespace __gnu_test; |
| |
| typedef filebuf::int_type int_type; |
| typedef filebuf::traits_type traits_type; |
| typedef size_t size_type; |
| |
| bool test __attribute__((unused)) = true; |
| streamsize strmsz_1, strmsz_2; |
| int_type c1, c2; |
| |
| // int_type sungetc() |
| // if in_cur not avail, return pbackfail(), else decrement and |
| // return to_int_type(*gptr()) |
| |
| // in | out |
| { |
| constraint_filebuf fb_01; |
| fb_01.pubsetbuf(0, 0); |
| fb_01.open(name_01, ios_base::out | ios_base::in | ios_base::trunc); |
| VERIFY( fb_01.unbuffered() ); |
| fb_01.sputc('u'); |
| fb_01.sputc('v'); |
| fb_01.pubseekoff(-1, std::ios_base::end); |
| fb_01.sbumpc(); |
| strmsz_1 = fb_01.in_avail(); |
| c2 = fb_01.sungetc(); |
| strmsz_2 = fb_01.in_avail(); |
| VERIFY( c2 == 'v' ); // VERIFY( c2 != traits_type::eof() ); |
| VERIFY( strmsz_1 + 1 == strmsz_2 ); |
| //test for _in_cur == _in_end |
| fb_01.pubseekoff(0, std::ios_base::end); |
| strmsz_1 = fb_01.in_avail(); // -1 cuz at the end |
| c1 = fb_01.sgetc(); |
| c2 = fb_01.sungetc(); |
| strmsz_2 = fb_01.in_avail(); // 1 |
| fb_01.sgetc(); |
| VERIFY( c1 != c2 ); |
| VERIFY( strmsz_2 != strmsz_1 ); |
| VERIFY( strmsz_2 == 1 ); |
| VERIFY( fb_01.unbuffered() ); |
| } |
| } |
| |
| int main() |
| { |
| test01(); |
| return 0; |
| } |