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

   1 // Copyright (C) 2001-2024 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // 27.8.1.3 filebuf member functions
  19 // @require@ %-*.tst %-*.txt
  20 // @diff@ %-*.tst %-*.txt
  21
  22 // various tests for filebuf::open() and filebuf::close() including
  23 // the non-portable functionality in the libstdc++-v3 IO library
  24
  25 // { dg-require-fileio "" }
  26
  27 #include <fstream>
  28 #include <testsuite_hooks.h>
  29
  30 const char name_01[] = "filebuf_members-1.tst";
  31 const char name_02[] = "filebuf_members-1.txt";
  32
  33 // Test member functions.
  34 void test_01()
  35 {
  36   const char* name_03 = "filebuf_members-3"; // empty file, need to create
  37
  38   std::filebuf fb_01; // in
  39   std::filebuf fb_02; // out
  40   std::filebuf fb_03; // in | out
  41
  42   // bool is_open()
  43   VERIFY( !fb_01.is_open() );
  44   VERIFY( !fb_02.is_open() );
  45   VERIFY( !fb_03.is_open() );
  46
  47   // filebuf_type* open(const char* __s, ios_base::openmode __mode)
  48   fb_01.open(name_01, std::ios_base::in | std::ios_base::ate);
  49   VERIFY( fb_01.is_open() );
  50
  51   // Try to open two different files without closing the first:
  52   // Should keep the old file attached, and disregard attempt to overthrow.
  53   std::filebuf* f = fb_02.open(name_02, std::ios_base::in | std::ios_base::out
  54                                | std::ios_base::trunc);
  55   VERIFY( f );
  56   VERIFY( fb_02.is_open() );
  57
  58   f = fb_02.open(name_03, std::ios_base::in | std::ios_base::out);
  59   VERIFY( !f );
  60   VERIFY( fb_02.is_open() );
  61
  62   fb_03.open(name_03, std::ios_base::out | std::ios_base::trunc);
  63   VERIFY( fb_03.is_open() );
  64 }
  65
  66 int
  67 main()
  68 {
  69   test_01();
  70   return 0;
  71 }
  72
  73