libstdc++-v3/testsuite/27_io/filesystem/iterators/directory_iterator.cc

   1 // Copyright (C) 2015-2023 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 // { dg-do run { target c++17 } }
  19 // { dg-require-filesystem-ts "" }
  20
  21 #include <filesystem>
  22 #include <testsuite_hooks.h>
  23 #include <testsuite_fs.h>
  24
  25 namespace fs = std::filesystem;
  26
  27 void
  28 test01()
  29 {
  30   const std::error_code bad_ec = make_error_code(std::errc::invalid_argument);
  31   std::error_code ec;
  32
  33   // Test non-existent path.
  34   const auto p = __gnu_test::nonexistent_path();
  35   fs::directory_iterator iter(p, ec);
  36   VERIFY( ec );
  37   VERIFY( iter == end(iter) );
  38
  39   // Test empty directory.
  40   create_directory(p, fs::current_path(), ec);
  41   VERIFY( !ec );
  42   ec = bad_ec;
  43   iter = fs::directory_iterator(p, ec);
  44   VERIFY( !ec );
  45   VERIFY( iter == end(iter) );
  46
  47   // Test non-empty directory.
  48   ec = bad_ec;
  49   create_directory(p / "x", ec);
  50   VERIFY( !ec );
  51   ec = bad_ec;
  52   iter = fs::directory_iterator(p, ec);
  53   VERIFY( !ec );
  54   VERIFY( iter != fs::directory_iterator() );
  55   VERIFY( iter->path() == p/"x" );
  56   ++iter;
  57   VERIFY( iter == end(iter) );
  58
  59   if (__gnu_test::permissions_are_testable())
  60   {
  61     // Test inaccessible directory.
  62     ec = bad_ec;
  63     permissions(p, fs::perms::none, ec);
  64     VERIFY( !ec );
  65     iter = fs::directory_iterator(p, ec);
  66     VERIFY( ec );
  67     VERIFY( iter == end(iter) );
  68
  69     // Test inaccessible directory, skipping permission denied.
  70     const auto opts = fs::directory_options::skip_permission_denied;
  71     ec = bad_ec;
  72     iter = fs::directory_iterator(p, opts, ec);
  73     VERIFY( !ec );
  74     VERIFY( iter == end(iter) );
  75
  76     permissions(p, fs::perms::owner_all, ec);
  77   }
  78
  79   remove_all(p, ec);
  80 }
  81
  82 void
  83 test02()
  84 {
  85   const std::error_code bad_ec = make_error_code(std::errc::invalid_argument);
  86   std::error_code ec;
  87   const auto p = __gnu_test::nonexistent_path();
  88   ec = bad_ec;
  89   create_directory(p, fs::current_path(), ec);
  90   create_directory(p / "x", ec);
  91   VERIFY( !ec );
  92
  93   // Test post-increment (libstdc++/71005)
  94   ec = bad_ec;
  95   auto iter = fs::directory_iterator(p, ec);
  96   VERIFY( !ec );
  97   VERIFY( iter != end(iter) );
  98   const auto entry1 = *iter;
  99   const auto entry2 = *iter++;
 100   VERIFY( entry1 == entry2 );
 101   VERIFY( entry1.path() == p/"x" );
 102   VERIFY( iter == end(iter) );
 103
 104   // Test post-increment (libstdc++/89986)
 105   ec = bad_ec;
 106   iter = fs::directory_iterator(p, ec);
 107   VERIFY( !ec );
 108   VERIFY( iter != end(iter) );
 109   iter.increment(ec);
 110   VERIFY( !ec );
 111   VERIFY( iter == end(iter) );
 112
 113   remove_all(p, ec);
 114 }
 115
 116 void
 117 test03()
 118 {
 119   std::error_code ec = make_error_code(std::errc::invalid_argument);
 120   const auto p = __gnu_test::nonexistent_path();
 121   create_directories(p / "longer_than_small_string_buffer", ec);
 122   VERIFY( !ec );
 123
 124   // Test for no reallocation on each dereference (this is a GNU extension)
 125   auto iter = fs::directory_iterator(p, ec);
 126   const auto* s1 = iter->path().c_str();
 127   const auto* s2 = iter->path().c_str();
 128   VERIFY( s1 == s2 );
 129
 130   remove_all(p, ec);
 131 }
 132
 133 void
 134 test04()
 135 {
 136   const fs::directory_iterator it;
 137   VERIFY( it == fs::directory_iterator() );
 138 }
 139
 140 void
 141 test05()
 142 {
 143   auto p = __gnu_test::nonexistent_path();
 144   create_directory(p);
 145   create_directory(p / "x");
 146   fs::directory_iterator it(p), endit;
 147   VERIFY( begin(it) == it );
 148   static_assert( noexcept(begin(it)), "begin is noexcept" );
 149   VERIFY( end(it) == endit );
 150   static_assert( noexcept(end(it)), "end is noexcept" );
 151
 152   std::error_code ec;
 153   remove_all(p, ec);
 154 }
 155
 156 int
 157 main()
 158 {
 159   test01();
 160   test02();
 161   test03();
 162   test04();
 163   test05();
 164 }