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From: Alexandre Oliva <aoliva@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc(refs/users/aoliva/heads/testme)] libstdc++: Fix unnecessary allocations in read_symlink [PR 96484] Date: Fri, 21 Aug 2020 04:09:18 +0000 (GMT) [thread overview] Message-ID: <20200821040918.F27F4386F448@sourceware.org> (raw) https://gcc.gnu.org/g:6a13a4e3f29fc4ce5eff96d74ba965c9fdc02184 commit 6a13a4e3f29fc4ce5eff96d74ba965c9fdc02184 Author: Jonathan Wakely <jwakely@redhat.com> Date: Thu Aug 6 18:44:50 2020 +0100 libstdc++: Fix unnecessary allocations in read_symlink [PR 96484] libstdc++-v3/ChangeLog: PR libstdc++/96484 * src/c++17/fs_ops.cc (fs::read_symlink): Return an error immediately for non-symlinks. * src/filesystem/ops.cc (fs::read_symlink): Likewise. Diff: --- libstdc++-v3/src/c++17/fs_ops.cc | 6 ++++++ libstdc++-v3/src/filesystem/ops.cc | 6 ++++++ 2 files changed, 12 insertions(+) diff --git a/libstdc++-v3/src/c++17/fs_ops.cc b/libstdc++-v3/src/c++17/fs_ops.cc index 873f93aacfc..c685b1824f9 100644 --- a/libstdc++-v3/src/c++17/fs_ops.cc +++ b/libstdc++-v3/src/c++17/fs_ops.cc @@ -1180,6 +1180,12 @@ fs::path fs::read_symlink(const path& p, error_code& ec) ec.assign(errno, std::generic_category()); return result; } + else if (!fs::is_symlink(make_file_status(st))) + { + ec.assign(EINVAL, std::generic_category()); + return result; + } + std::string buf(st.st_size ? st.st_size + 1 : 128, '\0'); do { diff --git a/libstdc++-v3/src/filesystem/ops.cc b/libstdc++-v3/src/filesystem/ops.cc index 29ea9c0ce87..8c8854bf28e 100644 --- a/libstdc++-v3/src/filesystem/ops.cc +++ b/libstdc++-v3/src/filesystem/ops.cc @@ -998,6 +998,12 @@ fs::path fs::read_symlink(const path& p [[gnu::unused]], error_code& ec) ec.assign(errno, std::generic_category()); return result; } + else if (!fs::is_symlink(make_file_status(st))) + { + ec.assign(EINVAL, std::generic_category()); + return result; + } + std::string buf(st.st_size ? st.st_size + 1 : 128, '\0'); do {
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