Applications: Move to Userland/Applications/

Userland/Applications/FileManager/FileUtils.cpp

@@ -0,0 +1,280 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "FileUtils.h"
+#include <AK/LexicalPath.h>
+#include <AK/ScopeGuard.h>
+#include <AK/StringBuilder.h>
+#include <LibCore/DirIterator.h>
+#include <LibCore/File.h>
+#include <LibGUI/MessageBox.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+namespace FileUtils {
+
+void delete_path(const String& path, GUI::Window* parent_window)
+{
+    struct stat st;
+    if (lstat(path.characters(), &st)) {
+        GUI::MessageBox::show(parent_window,
+            String::formatted("lstat({}) failed: {}", path, strerror(errno)),
+            "Delete failed",
+            GUI::MessageBox::Type::Error);
+    }
+
+    if (S_ISDIR(st.st_mode)) {
+        String error_path;
+        int error = FileUtils::delete_directory(path, error_path);
+
+        if (error) {
+            GUI::MessageBox::show(parent_window,
+                String::formatted("Failed to delete directory \"{}\": {}", error_path, strerror(error)),
+                "Delete failed",
+                GUI::MessageBox::Type::Error);
+        }
+    } else if (unlink(path.characters()) < 0) {
+        int saved_errno = errno;
+        GUI::MessageBox::show(parent_window,
+            String::formatted("unlink(\"{}\") failed: {}", path, strerror(saved_errno)),
+            "Delete failed",
+            GUI::MessageBox::Type::Error);
+    }
+}
+
+void delete_paths(const Vector<String>& paths, bool should_confirm, GUI::Window* parent_window)
+{
+    String message;
+    if (paths.size() == 1) {
+        message = String::formatted("Really delete {}?", LexicalPath(paths[0]).basename());
+    } else {
+        message = String::formatted("Really delete {} files?", paths.size());
+    }
+
+    if (should_confirm) {
+        auto result = GUI::MessageBox::show(parent_window,
+            message,
+            "Confirm deletion",
+            GUI::MessageBox::Type::Warning,
+            GUI::MessageBox::InputType::OKCancel);
+        if (result == GUI::MessageBox::ExecCancel)
+            return;
+    }
+
+    for (auto& path : paths) {
+        delete_path(path, parent_window);
+    }
+}
+
+int delete_directory(String directory, String& file_that_caused_error)
+{
+    Core::DirIterator iterator(directory, Core::DirIterator::SkipDots);
+    if (iterator.has_error()) {
+        file_that_caused_error = directory;
+        return -1;
+    }
+
+    while (iterator.has_next()) {
+        auto file_to_delete = String::formatted("{}/{}", directory, iterator.next_path());
+        struct stat st;
+
+        if (lstat(file_to_delete.characters(), &st)) {
+            file_that_caused_error = file_to_delete;
+            return errno;
+        }
+
+        if (S_ISDIR(st.st_mode)) {
+            if (delete_directory(file_to_delete, file_to_delete)) {
+                file_that_caused_error = file_to_delete;
+                return errno;
+            }
+        } else if (unlink(file_to_delete.characters())) {
+            file_that_caused_error = file_to_delete;
+            return errno;
+        }
+    }
+
+    if (rmdir(directory.characters())) {
+        file_that_caused_error = directory;
+        return errno;
+    }
+
+    return 0;
+}
+
+bool copy_file_or_directory(const String& src_path, const String& dst_path)
+{
+    int duplicate_count = 0;
+    while (access(get_duplicate_name(dst_path, duplicate_count).characters(), F_OK) == 0) {
+        ++duplicate_count;
+    }
+    if (duplicate_count != 0) {
+        return copy_file_or_directory(src_path, get_duplicate_name(dst_path, duplicate_count));
+    }
+
+    auto source_or_error = Core::File::open(src_path, Core::IODevice::ReadOnly);
+    if (source_or_error.is_error())
+        return false;
+
+    auto& source = *source_or_error.value();
+
+    struct stat src_stat;
+    int rc = fstat(source.fd(), &src_stat);
+    if (rc < 0)
+        return false;
+
+    if (source.is_directory())
+        return copy_directory(src_path, dst_path, src_stat);
+
+    return copy_file(dst_path, src_stat, source);
+}
+
+bool copy_directory(const String& src_path, const String& dst_path, const struct stat& src_stat)
+{
+    int rc = mkdir(dst_path.characters(), 0755);
+    if (rc < 0) {
+        return false;
+    }
+    Core::DirIterator di(src_path, Core::DirIterator::SkipDots);
+    if (di.has_error()) {
+        return false;
+    }
+    while (di.has_next()) {
+        String filename = di.next_path();
+        bool is_copied = copy_file_or_directory(
+            String::formatted("{}/{}", src_path, filename),
+            String::formatted("{}/{}", dst_path, filename));
+        if (!is_copied) {
+            return false;
+        }
+    }
+
+    auto my_umask = umask(0);
+    umask(my_umask);
+    rc = chmod(dst_path.characters(), src_stat.st_mode & ~my_umask);
+    if (rc < 0) {
+        return false;
+    }
+    return true;
+}
+
+bool copy_file(const String& dst_path, const struct stat& src_stat, Core::File& source)
+{
+    int dst_fd = creat(dst_path.characters(), 0666);
+    if (dst_fd < 0) {
+        if (errno != EISDIR) {
+            return false;
+        }
+        auto dst_dir_path = String::formatted("{}/{}", dst_path, LexicalPath(source.filename()).basename());
+        dst_fd = creat(dst_dir_path.characters(), 0666);
+        if (dst_fd < 0) {
+            return false;
+        }
+    }
+
+    ScopeGuard close_fd_guard([dst_fd]() { close(dst_fd); });
+
+    if (src_stat.st_size > 0) {
+        if (ftruncate(dst_fd, src_stat.st_size) < 0) {
+            perror("cp: ftruncate");
+            return false;
+        }
+    }
+
+    for (;;) {
+        char buffer[32768];
+        ssize_t nread = read(source.fd(), buffer, sizeof(buffer));
+        if (nread < 0) {
+            return false;
+        }
+        if (nread == 0)
+            break;
+        ssize_t remaining_to_write = nread;
+        char* bufptr = buffer;
+        while (remaining_to_write) {
+            ssize_t nwritten = write(dst_fd, bufptr, remaining_to_write);
+            if (nwritten < 0) {
+                return false;
+            }
+            assert(nwritten > 0);
+            remaining_to_write -= nwritten;
+            bufptr += nwritten;
+        }
+    }
+
+    auto my_umask = umask(0);
+    umask(my_umask);
+    int rc = fchmod(dst_fd, src_stat.st_mode & ~my_umask);
+    if (rc < 0) {
+        return false;
+    }
+
+    return true;
+}
+
+bool link_file(const String& src_path, const String& dst_path)
+{
+    int duplicate_count = 0;
+    while (access(get_duplicate_name(dst_path, duplicate_count).characters(), F_OK) == 0) {
+        ++duplicate_count;
+    }
+    if (duplicate_count != 0) {
+        return link_file(src_path, get_duplicate_name(dst_path, duplicate_count));
+    }
+    int rc = symlink(src_path.characters(), dst_path.characters());
+    if (rc < 0) {
+        return false;
+    }
+
+    return true;
+}
+
+String get_duplicate_name(const String& path, int duplicate_count)
+{
+    if (duplicate_count == 0) {
+        return path;
+    }
+    LexicalPath lexical_path(path);
+    StringBuilder duplicated_name;
+    duplicated_name.append('/');
+    for (size_t i = 0; i < lexical_path.parts().size() - 1; ++i) {
+        duplicated_name.appendff("{}/", lexical_path.parts()[i]);
+    }
+    auto prev_duplicate_tag = String::formatted("({})", duplicate_count);
+    auto title = lexical_path.title();
+    if (title.ends_with(prev_duplicate_tag)) {
+        // remove the previous duplicate tag "(n)" so we can add a new tag.
+        title = title.substring(0, title.length() - prev_duplicate_tag.length());
+    }
+    duplicated_name.appendff("{} ({})", lexical_path.title(), duplicate_count);
+    if (!lexical_path.extension().is_empty()) {
+        duplicated_name.appendff(".{}", lexical_path.extension());
+    }
+    return duplicated_name.build();
+}
+}