libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/char/2-out.cc

   1 // 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
   2
   3 // Copyright (C) 2001, 2002, 2003, 2009, 2010 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
  31 const char name_01[] = "seekoff-2out.tst";
  32
  33 void 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;
  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   // out
  60   {
  61     constraint_filebuf fb;
  62     fb.pubsetbuf(0, 0);
  63     fb.open(name_01, ios_base::out);
  64     VERIFY( fb.unbuffered() );
  65
  66     //beg
  67     strmsz_1 = fb.in_avail();
  68     pt_1 = fb.pubseekoff(2, ios_base::beg);
  69     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 == traits_type::eof() );
  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 != c3 );
  79     VERIFY( c3 == traits_type::eof() );
  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 == traits_type::eof() );
  90     fb.pubseekoff(0, ios_base::cur);
  91     c2 = fb.sputc('x');  //test current out pointer
  92     c3 = fb.sputc('\n');
  93     fb.pubseekoff(0, ios_base::cur);
  94     c1 = fb.sgetc();
  95     fb.pubsync();
  96     c3 = fb.sgetc();
  97     VERIFY( c1 == c3 );
  98
  99     //end
 100     pt_2 = fb.pubseekoff(0, ios_base::end);
 101     off_1 = off_type(pt_2);
 102     VERIFY( off_1 > off_2 ); //weak, but don't know exactly where it ends
 103     c3 = fb.sputc('\n');
 104     strmsz_1 = fb.sputn("because because because. . .", 28);
 105     VERIFY( strmsz_1 == 28 );
 106     fb.pubseekoff(-1, ios_base::end);
 107     fb.sgetc();
 108     c1 = fb.sungetc();
 109     // Defect?  retval of sungetc is not necessarily the character ungotten.
 110     // So re-get it.
 111     c1 = fb.sgetc();
 112     fb.pubsync();
 113     c3 = fb.sgetc();
 114     VERIFY( c1 == c3 );
 115     VERIFY( fb.unbuffered() );
 116   }
 117 }
 118
 119 int main()
 120 {
 121   test05();
 122   return 0;
 123 }