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[] = "seekoff-1io.tst"; 31 32void test05() 33{ 34 using namespace std; 35 using namespace __gnu_test; 36 37 typedef filebuf::int_type int_type; 38 typedef filebuf::pos_type pos_type; 39 typedef filebuf::off_type off_type; 40 41 bool test __attribute__((unused)) = true; 42 streamsize strmsz_1, strmsz_2; 43 44 int_type c1; 45 int_type c2; 46 int_type c3; 47 48 pos_type pt_1(off_type(-1)); 49 pos_type pt_2(off_type(0)); 50 off_type off_1 = 0; 51 off_type off_2 = 0; 52 53 // seekoff 54 // pubseekoff(off_type off, ios_base::seekdir way, ios_base::openmode which) 55 // alters the stream position to off 56 57 // in | out 58 { 59 constraint_filebuf fb; 60 fb.open(name_01, ios_base::out | ios_base::in); 61 VERIFY( !fb.write_position() ); 62 VERIFY( !fb.read_position() ); 63 64 //beg 65 strmsz_1 = fb.in_avail(); 66 pt_1 = fb.pubseekoff(2, ios_base::beg); 67 strmsz_2 = fb.in_avail(); 68 off_1 = off_type(pt_1); 69 VERIFY( off_1 > 0 ); 70 c1 = fb.snextc(); //current in pointer +1 71 VERIFY( c1 == '9' ); 72 fb.pubseekoff(3, ios_base::beg); 73 c2 = fb.sputc('\n'); //current in pointer +1 74 fb.pubseekoff(4, ios_base::beg); 75 c3 = fb.sgetc(); 76 VERIFY( c2 != c3 ); 77 VERIFY( c3 == '9' ); 78 fb.pubsync(); 79 c1 = fb.sgetc(); 80 VERIFY( c1 == c3 ); 81 82 //cur 83 pt_2 = fb.pubseekoff(2, ios_base::cur); 84 off_2 = off_type(pt_2); 85 VERIFY( (off_2 == (off_1 + 2 + 1 + 1)) ); 86 c1 = fb.snextc(); //current in pointer +1 87 VERIFY( c1 == '1' ); 88 fb.pubseekoff(0, ios_base::cur); 89 c2 = fb.sputc('x'); //test current out pointer 90 c3 = fb.sputc('\n'); 91 fb.pubseekoff(0, ios_base::cur); 92 c1 = fb.sgetc(); 93 fb.pubsync(); 94 c3 = fb.sgetc(); 95 VERIFY( c1 == c3 ); 96 97 //end 98 pt_2 = fb.pubseekoff(0, ios_base::end); 99 off_1 = off_type(pt_2); 100 VERIFY( off_1 > off_2 ); //weak, but don't know exactly where it ends 101 c3 = fb.sputc('\n'); 102 strmsz_1 = fb.sputn("because because because. . .", 28); 103 VERIFY( strmsz_1 == 28 ); 104 fb.pubseekoff(-1, ios_base::end); 105 fb.sgetc(); 106 c1 = fb.sungetc(); 107 // Defect? retval of sungetc is not necessarily the character ungotten. 108 // So re-get it. 109 c1 = fb.sgetc(); 110 fb.pubsync(); 111 c3 = fb.sgetc(); 112 VERIFY( c1 == c3 ); 113 VERIFY( !fb.write_position() ); 114 VERIFY( fb.read_position() ); 115 } 116} 117 118int main() 119{ 120 test05(); 121 return 0; 122} 123