1// 2001-05-21 Benjamin Kosnik <bkoz@redhat.com> 2 3// Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc. 4// 5// This file is part of the GNU ISO C++ Library. This library is free 6// software; you can redistribute it and/or modify it under the 7// terms of the GNU General Public License as published by the 8// Free Software Foundation; either version 2, or (at your option) 9// any later version. 10 11// This library is distributed in the hope that it will be useful, 12// but WITHOUT ANY WARRANTY; without even the implied warranty of 13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14// GNU General Public License for more details. 15 16// You should have received a copy of the GNU General Public License along 17// with this library; see the file COPYING. If not, write to the Free 18// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 19// USA. 20 21// 27.8.1.4 Overridden virtual functions 22 23#include <fstream> 24#include <testsuite_hooks.h> 25#include <testsuite_io.h> 26 27// @require@ %-*.tst %-*.txt 28// @diff@ %-*.tst %*.txt 29 30const char name_01[] = "tmp_sungetc_2io.tst"; // empty file, need to create 31 32void test01() 33{ 34 using namespace std; 35 using namespace __gnu_test; 36 37 typedef filebuf::int_type int_type; 38 typedef filebuf::traits_type traits_type; 39 typedef size_t size_type; 40 41 bool test __attribute__((unused)) = true; 42 streamsize strmsz_1, strmsz_2; 43 int_type c1, c2, c3; 44 45 // int_type sungetc() 46 // if in_cur not avail, return pbackfail(), else decrement and 47 // return to_int_type(*gptr()) 48 49 // in | out 50 { 51 constraint_filebuf fb_01; 52 fb_01.pubsetbuf(0, 0); 53 fb_01.open(name_01, ios_base::out | ios_base::in | ios_base::trunc); 54 VERIFY( fb_01.unbuffered() ); 55 fb_01.sputc('u'); 56 fb_01.sputc('v'); 57 fb_01.pubseekoff(-1, std::ios_base::end); 58 c3 = fb_01.sbumpc(); 59 strmsz_1 = fb_01.in_avail(); 60 c2 = fb_01.sungetc(); 61 strmsz_2 = fb_01.in_avail(); 62 VERIFY( c2 == 'v' ); // VERIFY( c2 != traits_type::eof() ); 63 VERIFY( strmsz_1 + 1 == strmsz_2 ); 64 //test for _in_cur == _in_end 65 fb_01.pubseekoff(0, std::ios_base::end); 66 strmsz_1 = fb_01.in_avail(); // -1 cuz at the end 67 c1 = fb_01.sgetc(); 68 c2 = fb_01.sungetc(); 69 strmsz_2 = fb_01.in_avail(); // 1 70 c3 = fb_01.sgetc(); 71 VERIFY( c1 != c2 ); 72 VERIFY( strmsz_2 != strmsz_1 ); 73 VERIFY( strmsz_2 == 1 ); 74 VERIFY( fb_01.unbuffered() ); 75 } 76} 77 78int main() 79{ 80 test01(); 81 return 0; 82} 83