libstdc++-v3/testsuite/27_io/basic_filebuf/seekpos/char/1-out.cc

   1 // 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
   2
   3 // Copyright (C) 2001-2024 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 // C++98 27.8.1.4 Overridden virtual functions
  21
  22 // { dg-require-fileio "" }
  23 // { dg-additional-files "seekpos-1out.tst" }
  24
  25 #include <fstream>
  26 #include <testsuite_hooks.h>
  27 #include <testsuite_io.h>
  28
  29 const char name_01[] = "seekpos-1out.tst"; // file with data in it
  30
  31 void test05()
  32 {
  33   using namespace std;
  34   using namespace __gnu_test;
  35
  36   typedef filebuf::int_type     int_type;
  37   typedef filebuf::pos_type     pos_type;
  38   typedef filebuf::off_type     off_type;
  39   typedef filebuf::traits_type  traits_type;
  40
  41   int_type c1;
  42   int_type c2;
  43   int_type c3;
  44
  45   pos_type pt_1(off_type(-1));
  46   pos_type pt_2(off_type(0));
  47   pos_type pt_3;
  48   off_type off_1 = 0;
  49   off_type off_2 = 0;
  50
  51   // seekpos
  52   // pubseekpos(pos_type sp, ios_base::openmode)
  53   // alters the stream position to sp
  54
  55   // out
  56   {
  57     constraint_filebuf fb;
  58     fb.open(name_01, ios_base::out);
  59     VERIFY( !fb.write_position() );
  60     VERIFY( !fb.read_position() );
  61
  62     // beg
  63     pt_1 = fb.pubseekoff(78, ios_base::beg);
  64     off_1 = off_type(pt_1);
  65     VERIFY( off_1 > 0 );
  66     c1 = fb.snextc(); //current in pointer +1
  67     VERIFY( c1 == traits_type::eof() );
  68
  69     // cur
  70     pt_3 = fb.pubseekoff(0, ios_base::cur);
  71     fb.pubseekpos(pt_3);
  72     c2 = fb.sputc('\n'); //test current out pointer
  73     pt_3 = fb.pubseekoff(0, ios_base::cur);
  74     fb.pubseekpos(pt_3);
  75     c3 = fb.sgetc();
  76     fb.pubsync(); //resets pointers
  77     pt_2 = fb.pubseekpos(pt_1);
  78     off_2 = off_type(pt_2);
  79     VERIFY( off_1 == off_2 );
  80     c3 = fb.snextc(); //current in pointer +1
  81     VERIFY( c2 != c3 );
  82     VERIFY( c3 == traits_type::eof() );
  83
  84     // end
  85     pt_1 = fb.pubseekoff(0, ios_base::end);
  86     off_1 = off_type(pt_1);
  87     VERIFY( off_1 > off_2 );
  88     fb.sputn("\nof the wonderful things he does!!\nok", 37);
  89     fb.pubsync();
  90     VERIFY( fb.write_position() );
  91     VERIFY( !fb.read_position() );
  92     fb.close();
  93     VERIFY( !fb.is_open() );
  94   }
  95 }
  96
  97 int main()
  98 {
  99   test05();
 100   return 0;
 101 }