LibCore+Everywhere: Return an Error from DirIterator::error()

This also removes DirIterator::error_string(), since the same strerror()
string will be included when you print the Error itself. Except in `ls`
which is still using fprintf() for now.

Meta/Lagom/Tools/CodeGenerators/LibUnicode/GeneratorUtil.h

@@ -348,12 +348,8 @@ inline ErrorOr<Core::DirIterator> path_to_dir_iterator(DeprecatedString path, St
         lexical_path = lexical_path.append(subpath);
 
     Core::DirIterator iterator(lexical_path.string(), Core::DirIterator::SkipParentAndBaseDir);
-    if (iterator.has_error()) {
-        // FIXME: Make Core::DirIterator return a StringView for its error
-        //        string.
-        auto const* error_string_ptr = iterator.error_string();
-        return Error::from_string_view({ error_string_ptr, strlen(error_string_ptr) });
-    }
+    if (iterator.has_error())
+        return iterator.error();
 
     return iterator;
 }
@@ -361,12 +357,8 @@ inline ErrorOr<Core::DirIterator> path_to_dir_iterator(DeprecatedString path, St
 inline ErrorOr<DeprecatedString> next_path_from_dir_iterator(Core::DirIterator& iterator)
 {
     auto next_path = iterator.next_full_path();
-    if (iterator.has_error()) {
-        // FIXME: Make Core::DirIterator return a StringView for its error
-        //        string.
-        auto const* error_string_ptr = iterator.error_string();
-        return Error::from_string_view({ error_string_ptr, strlen(error_string_ptr) });
-    }
+    if (iterator.has_error())
+        return iterator.error();
 
     return next_path;
 }

Userland/Applications/KeyboardSettings/KeyboardSettingsWidget.cpp

@@ -61,7 +61,7 @@ private:
 
         Core::DirIterator iterator("/res/keymaps/", Core::DirIterator::Flags::SkipDots);
         if (iterator.has_error()) {
-            GUI::MessageBox::show(nullptr, DeprecatedString::formatted("Error on reading mapping file list: {}", iterator.error_string()), "Keyboard settings"sv, GUI::MessageBox::Type::Error);
+            GUI::MessageBox::show(nullptr, DeprecatedString::formatted("Error on reading mapping file list: {}", iterator.error()), "Keyboard settings"sv, GUI::MessageBox::Type::Error);
             GUI::Application::the()->quit(-1);
         }
 

Userland/Applications/SpaceAnalyzer/Tree.cpp

@@ -13,7 +13,6 @@
 
 #include <fcntl.h>
 #include <sys/stat.h>
-#include <unistd.h>
 
 static constexpr size_t FILES_ENCOUNTERED_UPDATE_STEP_SIZE = 25;
 
@@ -93,8 +92,9 @@ HashMap<int, int> TreeNode::populate_filesize_tree(Vector<MountInfo>& mounts, Fu
 
         Core::DirIterator dir_iterator(builder.to_deprecated_string(), Core::DirIterator::SkipParentAndBaseDir);
         if (dir_iterator.has_error()) {
-            int error_sum = error_accumulator.get(dir_iterator.error()).value_or(0);
-            error_accumulator.set(dir_iterator.error(), error_sum + 1);
+            auto error_code = dir_iterator.error().code();
+            int error_sum = error_accumulator.get(error_code).value_or(0);
+            error_accumulator.set(error_code, error_sum + 1);
         } else {
             queue_entry.node->m_children = make<Vector<TreeNode>>();
             while (dir_iterator.has_next()) {

Userland/DevTools/HackStudio/Dialogs/ProjectTemplatesModel.cpp

@@ -111,7 +111,7 @@ void ProjectTemplatesModel::rescan_templates()
     // Iterate over template manifest INI files in the templates path
     Core::DirIterator di(ProjectTemplate::templates_path(), Core::DirIterator::SkipDots);
     if (di.has_error()) {
-        warnln("DirIterator: {}", di.error_string());
+        warnln("DirIterator: {}", di.error());
         return;
     }
 

Userland/Libraries/LibCore/DeprecatedFile.cpp

@@ -583,7 +583,7 @@ ErrorOr<void> DeprecatedFile::remove(StringView path, RecursionMode mode)
     if (S_ISDIR(path_stat.st_mode) && mode == RecursionMode::Allowed) {
         auto di = DirIterator(path, DirIterator::SkipParentAndBaseDir);
         if (di.has_error())
-            return Error::from_errno(di.error());
+            return di.error();
 
         while (di.has_next()) {
             TRY(remove(di.next_full_path(), RecursionMode::Allowed));

Userland/Libraries/LibCore/DirIterator.cpp

@@ -17,7 +17,7 @@ DirIterator::DirIterator(DeprecatedString path, Flags flags)
 {
     m_dir = opendir(m_path.characters());
     if (!m_dir) {
-        m_error = errno;
+        m_error = Error::from_errno(errno);
     }
 }
 
@@ -31,7 +31,7 @@ DirIterator::~DirIterator()
 
 DirIterator::DirIterator(DirIterator&& other)
     : m_dir(other.m_dir)
-    , m_error(other.m_error)
+    , m_error(move(other.m_error))
     , m_next(move(other.m_next))
     , m_path(move(other.m_path))
     , m_flags(other.m_flags)
@@ -48,7 +48,7 @@ bool DirIterator::advance_next()
         errno = 0;
         auto* de = readdir(m_dir);
         if (!de) {
-            m_error = errno;
+            m_error = Error::from_errno(errno);
             m_next.clear();
             return false;
         }

Userland/Libraries/LibCore/DirIterator.h

@@ -28,9 +28,8 @@ public:
     DirIterator(DirIterator&&);
     DirIterator(DirIterator const&) = delete;
 
-    bool has_error() const { return m_error != 0; }
-    int error() const { return m_error; }
-    char const* error_string() const { return strerror(m_error); }
+    bool has_error() const { return m_error.has_value(); }
+    Error error() const { return Error::copy(m_error.value()); }
     bool has_next();
     Optional<DirectoryEntry> next();
     DeprecatedString next_path();
@@ -39,7 +38,7 @@ public:
 
 private:
     DIR* m_dir = nullptr;
-    int m_error = 0;
+    Optional<Error> m_error;
     Optional<DirectoryEntry> m_next;
     DeprecatedString m_path;
     int m_flags;

Userland/Libraries/LibGUI/FileSystemModel.cpp

@@ -99,8 +99,9 @@ void FileSystemModel::Node::traverse_if_needed()
     auto full_path = this->full_path();
     Core::DirIterator di(full_path, m_model.should_show_dotfiles() ? Core::DirIterator::SkipParentAndBaseDir : Core::DirIterator::SkipDots);
     if (di.has_error()) {
-        m_error = di.error();
-        warnln("DirIterator: {}", di.error_string());
+        auto error = di.error();
+        m_error = error.code();
+        warnln("DirIterator: {}", error);
         return;
     }
 

Userland/Libraries/LibGfx/Font/FontDatabase.cpp

@@ -130,7 +130,7 @@ void FontDatabase::load_all_fonts_from_path(DeprecatedString const& root)
         auto current_directory = path_queue.dequeue();
         Core::DirIterator dir_iterator(current_directory, Core::DirIterator::SkipParentAndBaseDir);
         if (dir_iterator.has_error()) {
-            dbgln("FontDatabase::load_all_fonts_from_path: {}", dir_iterator.error_string());
+            dbgln("FontDatabase::load_all_fonts_from_path: {}", dir_iterator.error());
             continue;
         }
         while (dir_iterator.has_next()) {

Userland/Services/SystemServer/main.cpp

@@ -158,8 +158,9 @@ static ErrorOr<void> populate_devtmpfs_char_devices_based_on_sysfs()
 {
     Core::DirIterator di("/sys/dev/char/", Core::DirIterator::SkipParentAndBaseDir);
     if (di.has_error()) {
-        warnln("Failed to open /sys/dev/char - {}", di.error());
-        return Error::from_errno(di.error());
+        auto error = di.error();
+        warnln("Failed to open /sys/dev/char - {}", error);
+        return error;
     }
     while (di.has_next()) {
         auto entry_name = di.next_path().split(':');

Userland/Utilities/du.cpp

@@ -142,8 +142,9 @@ ErrorOr<u64> print_space_usage(DeprecatedString const& path, DuOption const& du_
     if (is_directory) {
         auto di = Core::DirIterator(path, Core::DirIterator::SkipParentAndBaseDir);
         if (di.has_error()) {
-            outln("du: cannot read directory '{}': {}", path, di.error_string());
-            return Error::from_string_literal("An error occurred. See previous error.");
+            auto error = di.error();
+            outln("du: cannot read directory '{}': {}", path, error);
+            return error;
         }
 
         while (di.has_next()) {

Userland/Utilities/ls.cpp

@@ -170,7 +170,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
             if (di.has_error()) {
                 status = 1;
-                fprintf(stderr, "%s: %s\n", path.characters(), di.error_string());
+                fprintf(stderr, "%s: %s\n", path.characters(), strerror(di.error().code()));
             }
 
             while (di.has_next()) {
@@ -396,7 +396,8 @@ static int do_file_system_object_long(char const* path)
     Core::DirIterator di(path, flags);
 
     if (di.has_error()) {
-        if (di.error() == ENOTDIR) {
+        auto error = di.error();
+        if (error.code() == ENOTDIR) {
             struct stat stat {
             };
             int rc = lstat(path, &stat);
@@ -406,7 +407,7 @@ static int do_file_system_object_long(char const* path)
                 return 0;
             return 2;
         }
-        fprintf(stderr, "%s: %s\n", path, di.error_string());
+        fprintf(stderr, "%s: %s\n", path, strerror(di.error().code()));
         return 1;
     }
 
@@ -510,7 +511,8 @@ int do_file_system_object_short(char const* path)
 
     Core::DirIterator di(path, flags);
     if (di.has_error()) {
-        if (di.error() == ENOTDIR) {
+        auto error = di.error();
+        if (error.code() == ENOTDIR) {
             size_t nprinted = 0;
             bool status = print_filesystem_object_short(path, path, &nprinted);
             printf("\n");
@@ -518,7 +520,7 @@ int do_file_system_object_short(char const* path)
                 return 0;
             return 2;
         }
-        fprintf(stderr, "%s: %s\n", path, di.error_string());
+        fprintf(stderr, "%s: %s\n", path, strerror(di.error().code()));
         return 1;
     }
 

Userland/Utilities/lsblk.cpp

@@ -27,8 +27,9 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     Core::DirIterator di("/sys/devices/storage/", Core::DirIterator::SkipParentAndBaseDir);
     if (di.has_error()) {
-        warnln("Failed to open /sys/devices/storage - {}", di.error());
-        return 1;
+        auto error = di.error();
+        warnln("Failed to open /sys/devices/storage - {}", error);
+        return error;
     }
 
     outln(format_row, "LUN"sv, "Command set"sv, "Block Size"sv, "Last LBA"sv);

Userland/Utilities/lspci.cpp

@@ -70,8 +70,9 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     Core::DirIterator di("/sys/bus/pci/", Core::DirIterator::SkipParentAndBaseDir);
     if (di.has_error()) {
-        warnln("Failed to open /sys/bus/pci - {}", di.error());
-        return 1;
+        auto error = di.error();
+        warnln("Failed to open /sys/bus/pci - {}", error);
+        return error;
     }
 
     TRY(Core::System::pledge("stdio rpath"));

Userland/Utilities/mount.cpp

@@ -129,8 +129,8 @@ static ErrorOr<void> mount_all()
 
     auto fstab_directory_iterator = Core::DirIterator("/etc/fstab.d", Core::DirIterator::SkipDots);
 
-    if (fstab_directory_iterator.has_error() && fstab_directory_iterator.error() != ENOENT) {
-        dbgln("Failed to open /etc/fstab.d: {}", fstab_directory_iterator.error_string());
+    if (fstab_directory_iterator.has_error() && fstab_directory_iterator.error().code() != ENOENT) {
+        dbgln("Failed to open /etc/fstab.d: {}", fstab_directory_iterator.error());
     } else if (!fstab_directory_iterator.has_error()) {
         while (fstab_directory_iterator.has_next()) {
             auto path = fstab_directory_iterator.next_full_path();

Userland/Utilities/sysctl.cpp

@@ -82,7 +82,7 @@ static int handle_show_all()
 {
     Core::DirIterator di("/sys/kernel/variables", Core::DirIterator::SkipDots);
     if (di.has_error()) {
-        outln("DirIterator: {}", di.error_string());
+        outln("DirIterator: {}", di.error());
         return 1;
     }
 

Userland/Utilities/tree.cpp

@@ -48,7 +48,7 @@ static void print_directory_tree(DeprecatedString const& root_path, int depth, D
 
     Core::DirIterator di(root_path, flag_show_hidden_files ? Core::DirIterator::SkipParentAndBaseDir : Core::DirIterator::SkipDots);
     if (di.has_error()) {
-        warnln("{}: {}", root_path, di.error_string());
+        warnln("{}: {}", root_path, di.error());
         return;
     }
 
@@ -56,7 +56,7 @@ static void print_directory_tree(DeprecatedString const& root_path, int depth, D
     while (di.has_next()) {
         DeprecatedString name = di.next_path();
         if (di.has_error()) {
-            warnln("{}: {}", root_path, di.error_string());
+            warnln("{}: {}", root_path, di.error());
             continue;
         }
         names.append(name);