1// 2001-05-21 Benjamin Kosnik <bkoz@redhat.com> 2 3// Copyright (C) 2001, 2002, 2003, 2009 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 3, 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 COPYING3. If not see 18// <http://www.gnu.org/licenses/>. 19 20// 27.8.1.4 Overridden virtual functions 21 22// { dg-require-fileio "" } 23 24#include <fstream> 25#include <testsuite_hooks.h> 26#include <testsuite_io.h> 27 28// @require@ %-*.tst %-*.txt 29// @diff@ %-*.tst %*.txt 30 31const char name_01[] = "seekoff.txt"; 32 33void test05() 34{ 35 using namespace std; 36 using namespace __gnu_test; 37 38 typedef filebuf::int_type int_type; 39 typedef filebuf::pos_type pos_type; 40 typedef filebuf::off_type off_type; 41 typedef filebuf::traits_type traits_type; 42 43 bool test __attribute__((unused)) = true; 44 streamsize strmsz_1, strmsz_2; 45 46 int_type c1; 47 int_type c2; 48 int_type c3; 49 50 pos_type pt_1(off_type(-1)); 51 pos_type pt_2(off_type(0)); 52 off_type off_1 = 0; 53 off_type off_2 = 0; 54 55 // seekoff 56 // pubseekoff(off_type off, ios_base::seekdir way, ios_base::openmode which) 57 // alters the stream position to off 58 59 // in 60 { 61 constraint_filebuf fb; 62 fb.pubsetbuf(0, 0); 63 fb.open(name_01, ios_base::in); 64 VERIFY( fb.unbuffered() ); 65 66 //beg 67 strmsz_1 = fb.in_avail(); 68 pt_1 = fb.pubseekoff(2, ios_base::beg); 69 strmsz_2 = fb.in_avail(); 70 off_1 = off_type(pt_1); 71 VERIFY( off_1 > 0 ); 72 c1 = fb.snextc(); //current in pointer +1 73 VERIFY( c1 == '9' ); 74 fb.pubseekoff(3, ios_base::beg); 75 c2 = fb.sputc('\n'); //current in pointer +1 76 fb.pubseekoff(4, ios_base::beg); 77 c3 = fb.sgetc(); 78 VERIFY( c2 == traits_type::eof() ); 79 VERIFY( c3 == '9' ); 80 fb.pubsync(); 81 c1 = fb.sgetc(); 82 VERIFY( c1 == c3 ); 83 84 //cur 85 pt_2 = fb.pubseekoff(2, ios_base::cur); 86 off_2 = off_type(pt_2); 87 VERIFY( (off_2 == (off_1 + 2 + 1 + 1)) ); 88 c1 = fb.snextc(); //current in pointer +1 89 VERIFY( c1 == '1' ); 90 fb.pubseekoff(0, ios_base::cur); 91 c2 = fb.sputc('x'); //test current out pointer 92 c3 = fb.sputc('\n'); 93 VERIFY( c2 == traits_type::eof() ); 94 VERIFY( c3 == traits_type::eof() ); 95 fb.pubseekoff(0, ios_base::cur); 96 c1 = fb.sgetc(); 97 fb.pubsync(); 98 c3 = fb.sgetc(); 99 VERIFY( c1 == c3 ); 100 101 //end 102 pt_2 = fb.pubseekoff(0, ios_base::end); 103 off_1 = off_type(pt_2); 104 VERIFY( off_1 > off_2 ); //weak, but don't know exactly where it ends 105 c3 = fb.sputc('\n'); 106 strmsz_1 = fb.sputn("because because because. . .", 28); 107 VERIFY( strmsz_1 == 0 ); 108 fb.pubseekoff(-1, ios_base::end); 109 fb.sgetc(); 110 c1 = fb.sungetc(); 111 // Defect? retval of sungetc is not necessarily the character ungotten. 112 // So re-get it. 113 c1 = fb.sgetc(); 114 fb.pubsync(); 115 c3 = fb.sgetc(); 116 VERIFY( c1 == c3 ); 117 VERIFY( fb.unbuffered() ); 118 } 119} 120 121int main() 122{ 123 test05(); 124 return 0; 125} 126