From dd35da2cbef6d8bf9db86d7e66faeebb5022c881 Mon Sep 17 00:00:00 2001 From: Jonathan Wakely Date: Tue, 28 Aug 2018 16:33:53 +0100 Subject: [PATCH] PR libstdc++/87116 fix path::lexically_normal() handling of dot-dot Previously the logic that turned "a/b/c/../.." into "a/" failed to preserve an empty path at the end of the iteration sequence, as required by the trailing slash. That meant the result didn't meet the class invariants, and that "a/b/c/d/../../.." would remove four components instead of the three that "../../.." should remove. PR libstdc++/87116 * src/filesystem/std-path.cc (path::lexically_normal): When handling a dot-dot filename, preserve an empty final component in the iteration sequence. [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Use preferred-separator for root-directory. * testsuite/27_io/filesystem/path/generation/normal.cc: Add new tests for more than two adjacent dot-dot filenames. [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Replace slashes with preferred-separator in expected normalized strings. From-SVN: r263922 --- libstdc++-v3/ChangeLog | 13 ++++ libstdc++-v3/src/filesystem/std-path.cc | 19 ++++-- .../filesystem/path/generation/normal.cc | 63 ++++++++++++++++++- 3 files changed, 88 insertions(+), 7 deletions(-) diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog index d752108797d..b6ae0e5ffab 100644 --- a/libstdc++-v3/ChangeLog +++ b/libstdc++-v3/ChangeLog @@ -1,3 +1,16 @@ +2018-08-28 Jonathan Wakely + + PR libstdc++/87116 + * src/filesystem/std-path.cc (path::lexically_normal): When handling + a dot-dot filename, preserve an empty final component in the iteration + sequence. + [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Use preferred-separator for + root-directory. + * testsuite/27_io/filesystem/path/generation/normal.cc: Add new tests + for more than two adjacent dot-dot filenames. + [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Replace slashes with + preferred-separator in expected normalized strings. + 2018-08-25 Iain Sandoe PR libstdc++/70694 diff --git a/libstdc++-v3/src/filesystem/std-path.cc b/libstdc++-v3/src/filesystem/std-path.cc index f6c0b8bb0f6..f382eb3759a 100644 --- a/libstdc++-v3/src/filesystem/std-path.cc +++ b/libstdc++-v3/src/filesystem/std-path.cc @@ -438,7 +438,7 @@ path::lexically_normal() const { #ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS // Replace each slash character in the root-name - if (p._M_type == _Type::_Root_name) + if (p._M_type == _Type::_Root_name || p._M_type == _Type::_Root_dir) { string_type s = p.native(); std::replace(s.begin(), s.end(), L'/', L'\\'); @@ -458,7 +458,8 @@ path::lexically_normal() const } else if (!ret.has_relative_path()) { - if (!ret.is_absolute()) + // remove a dot-dot filename immediately after root-directory + if (!ret.has_root_directory()) ret /= p; } else @@ -471,8 +472,18 @@ path::lexically_normal() const { // Remove the filename before the trailing slash // (equiv. to ret = ret.parent_path().remove_filename()) - ret._M_pathname.erase(elem._M_cur->_M_pos); - ret._M_cmpts.erase(elem._M_cur, ret._M_cmpts.end()); + + if (elem == ret.begin()) + ret.clear(); + else + { + ret._M_pathname.erase(elem._M_cur->_M_pos); + // Do we still have a trailing slash? + if (std::prev(elem)->_M_type == _Type::_Filename) + ret._M_cmpts.erase(elem._M_cur); + else + ret._M_cmpts.erase(elem._M_cur, ret._M_cmpts.end()); + } } else // ??? ret /= p; diff --git a/libstdc++-v3/testsuite/27_io/filesystem/path/generation/normal.cc b/libstdc++-v3/testsuite/27_io/filesystem/path/generation/normal.cc index 6d0e2007a75..3b8311f81ad 100644 --- a/libstdc++-v3/testsuite/27_io/filesystem/path/generation/normal.cc +++ b/libstdc++-v3/testsuite/27_io/filesystem/path/generation/normal.cc @@ -24,7 +24,17 @@ #include using std::filesystem::path; -using __gnu_test::compare_paths; + +void +compare_paths(path p, std::string expected) +{ +#if defined(_WIN32) && !defined(__CYGWIN__) + for (auto& c : expected) + if (c == '/') + c = '\\'; +#endif + __gnu_test::compare_paths(p, expected); +} void test01() @@ -69,8 +79,11 @@ test03() {"/foo" , "/foo" }, {"/foo/" , "/foo/" }, {"/foo/." , "/foo/" }, - {"/foo/bar/.." , "/foo/" }, {"/foo/.." , "/" }, + {"/foo/../.." , "/" }, + {"/foo/bar/.." , "/foo/" }, + {"/foo/bar/../.." , "/" }, + {"/foo/bar/baz/../../.." , "/" }, // PR libstdc++/87116 {"/." , "/" }, {"/./" , "/" }, @@ -88,10 +101,11 @@ test03() {"foo/.." , "." }, {"foo/../" , "." }, {"foo/../.." , ".." }, + {"foo/../../..", "../.." }, // with root name (OS-dependent): #if defined(_WIN32) && !defined(__CYGWIN__) - {"C:bar/.." , "C:." }, + {"C:bar/.." , "C:" }, #else {"C:bar/.." , "." }, #endif @@ -119,10 +133,53 @@ test03() compare_paths( path(test.input).lexically_normal(), test.normalized ); } +void +test04() +{ + // PR libstdc++/87116 + path p = "a/b/c"; + compare_paths( (p/"../..").lexically_normal(), "a/" ); + + p = "a/b/c/d/e"; + compare_paths( (p/"..").lexically_normal(), "a/b/c/d/" ); + compare_paths( (p/"../..").lexically_normal(), "a/b/c/" ); + compare_paths( (p/"../../..").lexically_normal(), "a/b/" ); + compare_paths( (p/"../../../..").lexically_normal(), "a/" ); + compare_paths( (p/"../../../../..").lexically_normal(), "." ); + compare_paths( (p/"../../../../../..").lexically_normal(), ".." ); + + p = "/a/b/c/d/e"; + compare_paths( (p/"..").lexically_normal(), "/a/b/c/d/" ); + compare_paths( (p/"../..").lexically_normal(), "/a/b/c/" ); + compare_paths( (p/"../../..").lexically_normal(), "/a/b/" ); + compare_paths( (p/"../../../..").lexically_normal(), "/a/" ); + compare_paths( (p/"../../../../..").lexically_normal(), "/" ); + compare_paths( (p/"../../../../../..").lexically_normal(), "/" ); + +#if defined(_WIN32) && !defined(__CYGWIN__) + p = "A:b/c/d/e"; + compare_paths( (p/"..").lexically_normal(), "A:b/c/d/" ); + compare_paths( (p/"../..").lexically_normal(), "A:b/c/" ); + compare_paths( (p/"../../..").lexically_normal(), "A:b/" ); + compare_paths( (p/"../../../..").lexically_normal(), "A:" ); + compare_paths( (p/"../../../../..").lexically_normal(), "A:.." ); + compare_paths( (p/"../../../../../..").lexically_normal(), "A:../.." ); + + p = "A:/b/c/d/e"; + compare_paths( (p/"..").lexically_normal(), "A:/b/c/d/" ); + compare_paths( (p/"../..").lexically_normal(), "A:/b/c/" ); + compare_paths( (p/"../../..").lexically_normal(), "A:/b/" ); + compare_paths( (p/"../../../..").lexically_normal(), "A:/" ); + compare_paths( (p/"../../../../..").lexically_normal(), "A:/" ); + compare_paths( (p/"../../../../../..").lexically_normal(), "A:/" ); +#endif +} + int main() { test01(); test02(); test03(); + test04(); } -- 2.30.2