Everywhere: Hoist the Libraries folder to the top-level

Author: https://github.com/trflynn89
Commit: 93712b24bf
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2256
Reviewed-by: https://github.com/sideshowbarker

Libraries/LibCore/DirIterator.cpp

@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.org>
+ * Copyright (c) 2023, Sam Atkins <atkinssj@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibCore/DirIterator.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+
+namespace Core {
+
+DirIterator::DirIterator(ByteString path, Flags flags)
+    : m_path(move(path))
+    , m_flags(flags)
+{
+    m_dir = opendir(m_path.characters());
+    if (!m_dir) {
+        m_error = Error::from_errno(errno);
+    }
+}
+
+DirIterator::~DirIterator()
+{
+    if (m_dir) {
+        closedir(m_dir);
+        m_dir = nullptr;
+    }
+}
+
+DirIterator::DirIterator(DirIterator&& other)
+    : m_dir(other.m_dir)
+    , m_error(move(other.m_error))
+    , m_next(move(other.m_next))
+    , m_path(move(other.m_path))
+    , m_flags(other.m_flags)
+{
+    other.m_dir = nullptr;
+}
+
+static constexpr bool dirent_has_d_type =
+#if defined(AK_OS_SOLARIS) || defined(AK_OS_HAIKU)
+    false;
+#else
+    true;
+#endif
+
+bool DirIterator::advance_next()
+{
+    if (!m_dir)
+        return false;
+
+    while (true) {
+        errno = 0;
+        auto* de = readdir(m_dir);
+        if (!de) {
+            if (errno != 0) {
+                m_error = Error::from_errno(errno);
+                dbgln("DirIteration error: {}", m_error.value());
+            }
+            m_next.clear();
+            return false;
+        }
+
+        if constexpr (dirent_has_d_type)
+            m_next = DirectoryEntry::from_dirent(*de);
+        else
+            m_next = DirectoryEntry::from_stat(m_dir, *de);
+
+        if (m_next->name.is_empty())
+            return false;
+
+        if (m_flags & Flags::SkipDots && m_next->name.starts_with('.'))
+            continue;
+
+        if (m_flags & Flags::SkipParentAndBaseDir && (m_next->name == "." || m_next->name == ".."))
+            continue;
+
+#ifndef AK_OS_WINDOWS
+        if constexpr (dirent_has_d_type) {
+            // dirent structures from readdir aren't guaranteed to contain valid file types,
+            // as it is possible that the underlying filesystem doesn't keep track of those.
+            // However, if we were requested to not do stat on the entries of this directory,
+            // the calling code will be given the raw unknown type.
+            if ((m_flags & Flags::NoStat) == 0 && m_next->type == DirectoryEntry::Type::Unknown) {
+                struct stat statbuf;
+                if (fstatat(dirfd(m_dir), de->d_name, &statbuf, AT_SYMLINK_NOFOLLOW) < 0) {
+                    m_error = Error::from_errno(errno);
+                    dbgln("DirIteration error: {}", m_error.value());
+                    return false;
+                }
+                m_next->type = DirectoryEntry::directory_entry_type_from_stat(statbuf.st_mode);
+            }
+        }
+#endif
+
+        return !m_next->name.is_empty();
+    }
+}
+
+bool DirIterator::has_next()
+{
+    if (m_next.has_value())
+        return true;
+
+    return advance_next();
+}
+
+Optional<DirectoryEntry> DirIterator::next()
+{
+    if (!m_next.has_value())
+        advance_next();
+
+    auto result = m_next;
+    m_next.clear();
+    return result;
+}
+
+ByteString DirIterator::next_path()
+{
+    auto entry = next();
+    if (entry.has_value())
+        return entry->name;
+    return "";
+}
+
+ByteString DirIterator::next_full_path()
+{
+    StringBuilder builder;
+    builder.append(m_path);
+    if (!m_path.ends_with('/'))
+        builder.append('/');
+    builder.append(next_path());
+    return builder.to_byte_string();
+}
+
+#ifndef AK_OS_WINDOWS
+int DirIterator::fd() const
+{
+    if (!m_dir)
+        return -1;
+    return dirfd(m_dir);
+}
+#endif
+
+}