| // Copyright (C) 2010-2014 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/>. |
| |
| // { dg-require-fileio "" } |
| |
| #include <fstream> |
| #include <testsuite_hooks.h> |
| |
| const char name_01[] = "tmp_seekoff_45628.tst"; |
| |
| unsigned underflows, overflows; |
| |
| class my_filebuf |
| : public std::filebuf |
| { |
| virtual int_type |
| underflow() |
| { |
| ++underflows; |
| return std::filebuf::underflow(); |
| } |
| virtual int_type |
| overflow(int_type c) |
| { |
| ++overflows; |
| return std::filebuf::overflow(c); |
| } |
| }; |
| |
| // libstdc++/45628 |
| void test01() |
| { |
| bool test __attribute__((unused)) = true; |
| |
| my_filebuf q; |
| q.open(name_01, std::ios_base::in | std::ios_base::out |
| | std::ios_base::trunc); |
| |
| q.sputc('a'); |
| q.pubseekoff(0, std::ios_base::cur); |
| q.sputc('b'); |
| q.pubseekoff(0, std::ios_base::cur); |
| q.sputc('c'); |
| q.pubseekoff(0, std::ios_base::cur); |
| |
| VERIFY( overflows <= 1 ); // only initial sputc allowed to overflow |
| q.pubseekoff(0, std::ios_base::beg); |
| |
| q.sbumpc(); |
| VERIFY( underflows == 1 ); |
| |
| q.pubseekoff(0, std::ios_base::cur); |
| q.sbumpc(); |
| q.pubseekoff(0, std::ios_base::cur); |
| q.sbumpc(); |
| q.pubseekoff(0, std::ios_base::cur); |
| |
| VERIFY( underflows == 1 ); |
| } |
| |
| int main() |
| { |
| test01(); |
| return 0; |
| } |