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765936ebae
Problem: - `(void)` simply casts the expression to void. This is understood to indicate that it is ignored, but this is really a compiler trick to get the compiler to not generate a warning. Solution: - Use the `[[maybe_unused]]` attribute to indicate the value is unused. Note: - Functions taking a `(void)` argument list have also been changed to `()` because this is not needed and shows up in the same grep command.
104 lines
4.1 KiB
C++
104 lines
4.1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/ByteBuffer.h>
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#include <AK/JsonArray.h>
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#include <AK/JsonObject.h>
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#include <AK/NumberFormat.h>
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#include <AK/String.h>
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#include <AK/Vector.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/File.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static bool flag_human_readable = false;
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struct FileSystem {
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String fs;
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size_t total_block_count { 0 };
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size_t free_block_count { 0 };
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size_t total_inode_count { 0 };
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size_t free_inode_count { 0 };
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size_t block_size { 0 };
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String mount_point;
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};
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int main(int argc, char** argv)
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{
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Core::ArgsParser args_parser;
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args_parser.set_general_help("Display free disk space of each partition.");
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args_parser.add_option(flag_human_readable, "Print human-readable sizes", "human-readable", 'h');
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args_parser.parse(argc, argv);
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auto file = Core::File::construct("/proc/df");
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if (!file->open(Core::IODevice::ReadOnly)) {
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fprintf(stderr, "Failed to open /proc/df: %s\n", file->error_string());
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return 1;
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}
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if (flag_human_readable) {
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printf("Filesystem Size Used Available Mount point\n");
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} else {
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printf("Filesystem Blocks Used Available Mount point\n");
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}
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auto file_contents = file->read_all();
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auto json_result = JsonValue::from_string(file_contents);
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ASSERT(json_result.has_value());
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auto json = json_result.value().as_array();
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json.for_each([](auto& value) {
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auto fs_object = value.as_object();
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auto fs = fs_object.get("class_name").to_string();
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auto total_block_count = fs_object.get("total_block_count").to_u32();
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auto free_block_count = fs_object.get("free_block_count").to_u32();
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[[maybe_unused]] auto total_inode_count = fs_object.get("total_inode_count").to_u32();
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[[maybe_unused]] auto free_inode_count = fs_object.get("free_inode_count").to_u32();
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auto block_size = fs_object.get("block_size").to_u32();
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auto mount_point = fs_object.get("mount_point").to_string();
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printf("%-10s", fs.characters());
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if (flag_human_readable) {
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printf("%10s ", human_readable_size(total_block_count * block_size).characters());
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printf("%10s ", human_readable_size((total_block_count - free_block_count) * block_size).characters());
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printf("%10s ", human_readable_size(free_block_count * block_size).characters());
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} else {
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printf("%10u ", total_block_count);
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printf("%10u ", total_block_count - free_block_count);
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printf("%10u ", free_block_count);
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}
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printf("%s", mount_point.characters());
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printf("\n");
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});
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return 0;
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}
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