old-autovect-branch/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/char/2-io.cc

   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
  30 const char name_01[] = "seekoff-2io.tst";
  31
  32 void 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.pubsetbuf(0, 0);
  61     fb.open(name_01, ios_base::out | ios_base::in);
  62     VERIFY( fb.unbuffered() );
  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.unbuffered() );
 114   }
 115 }
 116
 117 int main()
 118 {
 119   test05();
 120   return 0;
 121 }