libstdc++-v3/testsuite/27_io/basic_filebuf/sgetc/char/1-io.cc

   1 // 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
   2
   3 // Copyright (C) 2001-2022 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[] = "sgetc.txt"; // file with data in it
  32 const char name_03[] = "tmp_sgetc_1io.tst"; // empty file, need to create
  33
  34 // Test overloaded virtual functions.
  35 void test05()
  36 {
  37   using namespace std;
  38   using namespace __gnu_test;
  39   typedef std::filebuf::int_type        int_type;
  40   typedef filebuf::traits_type          traits_type;
  41
  42   int_type                      c1, c2, c3;
  43
  44   // int_type sgetc()
  45   // if read_cur not avail, return uflow(), else return *read_cur
  46
  47   // in | out 1
  48   {
  49     constraint_filebuf fb_03; // in | out
  50     fb_03.open(name_03, ios::out | ios::in | ios::trunc);
  51     VERIFY( !fb_03.write_position() );
  52     VERIFY( !fb_03.read_position() );
  53     c1 = fb_03.sgetc();
  54     c2 = fb_03.sbumpc();
  55     VERIFY( c1 == traits_type::eof() );
  56     VERIFY( c1 == c2 );
  57     VERIFY( !fb_03.write_position() );
  58     VERIFY( !fb_03.read_position() );
  59   }
  60
  61   // in | out 2
  62   {
  63     constraint_filebuf fb_01; // in
  64     fb_01.open(name_01, ios::in | ios::out);
  65     VERIFY( !fb_01.write_position() );
  66     c1 = fb_01.sgetc();
  67     VERIFY( c1 == '/' );
  68     c2 = fb_01.sgetc();
  69     VERIFY( c1 == c2 );
  70     fb_01.sbumpc();
  71     c1 = fb_01.sbumpc();
  72     c2 = fb_01.sgetc();
  73     c3 = fb_01.sgetc();
  74     VERIFY( c1 == '/' );
  75     VERIFY( c2 == ' ' );
  76     VERIFY( c3 == ' ' );
  77     VERIFY( !fb_01.write_position() );
  78     VERIFY( fb_01.read_position() );
  79   }
  80 }
  81
  82 int main()
  83 {
  84   test05();
  85   return 0;
  86 }