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

   1 // 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
   2
   3 // Copyright (C) 2001-2023 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_sbumpc_1io.tst"; // empty file, need to create
  33
  34 void test05()
  35 {
  36   using namespace std;
  37   using namespace __gnu_test;
  38   typedef filebuf::int_type     int_type;
  39   typedef filebuf::traits_type  traits_type;
  40
  41   // int_type sbumpc()
  42   // if read_cur not avail returns uflow(), else return *read_cur & increment
  43
  44   // in | out 1
  45   {
  46     constraint_filebuf fb_03;
  47     fb_03.open(name_03, ios_base::out | ios_base::in | ios_base::trunc);
  48     VERIFY( !fb_03.write_position() );
  49     VERIFY( !fb_03.read_position() );
  50     int_type c5 = fb_03.sbumpc();
  51     VERIFY( c5 == traits_type::eof() );
  52     VERIFY( !fb_03.write_position() );
  53     VERIFY( !fb_03.read_position() );
  54   }
  55
  56   // in | out 2
  57   {
  58     constraint_filebuf fb_01;
  59     fb_01.open(name_01, ios_base::in | ios_base::out);
  60     VERIFY( !fb_01.write_position() );
  61
  62     int_type c1 = fb_01.sbumpc();
  63     VERIFY( c1 == '/' );
  64     int_type c3 = fb_01.sbumpc();
  65     VERIFY( c3 == '/' );
  66
  67     c1 = fb_01.sgetc();
  68     int_type c2 = fb_01.sbumpc();
  69     c3 = fb_01.sgetc();
  70     VERIFY( c1 == ' ' );
  71     VERIFY( c3 == '9' );
  72     VERIFY( c1 == c2 );
  73     VERIFY( c2 != c3 );
  74
  75     c1 = fb_01.sbumpc();
  76     c2 = fb_01.sbumpc();
  77     c3 = fb_01.sgetc();
  78     VERIFY( c1 == '9' );
  79     VERIFY( c2 == '9' );
  80     VERIFY( c3 == '0' );
  81
  82     VERIFY( !fb_01.write_position() );
  83     VERIFY( fb_01.read_position() );
  84   }
  85 }
  86
  87 int main()
  88 {
  89   test05();
  90   return 0;
  91 }