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Utilities/drain: Add an option to specify different block size

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This is useful for a situation when handling a small file than 512 KiB
or being under low system memory pressure.
This commit is contained in:
Liav A 2023-12-10 09:25:24 +02:00 committed by Tim Flynn
parent 5204020d42
commit f67b9cb680
Notes: sideshowbarker 2024-07-17 02:22:23 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/f67b9cb680
Pull-request: https://github.com/SerenityOS/serenity/pull/22233
Reviewed-by: https://github.com/trflynn89
1 changed files with 13 additions and 4 deletions
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17
Userland/Utilities/drain.cpp
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@ -4,14 +4,13 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Checked.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <LibCore/System.h>
#include <LibFileSystem/FileSystem.h>
#include <LibMain/Main.h>
constexpr size_t block_size = 256 * KiB;
static ErrorOr<void> seek_and_read(size_t offset, ByteBuffer& buffer, Core::File& file)
{
TRY(file.seek(offset, SeekMode::SetPosition));
@ -26,7 +25,7 @@ static ErrorOr<void> seek_and_write(size_t offset, ByteBuffer& buffer, Core::Fil
return {};
}
static ErrorOr<void> process_file(Core::File& file, size_t file_size, size_t file_size_rounded)
static ErrorOr<void> process_file(Core::File& file, size_t block_size, size_t file_size, size_t file_size_rounded)
{
size_t head = 0;
size_t tail = file_size_rounded - block_size;
@ -79,11 +78,21 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
TRY(Core::System::pledge("stdio cpath rpath wpath"));
StringView path;
size_t block_size_in_kib = 256;
Core::ArgsParser args_parser;
args_parser.set_general_help("Print file to stdout, while progressively deleting read segments.");
args_parser.add_option(block_size_in_kib, "Base Block size in KiB, defaults to 256 KiB", "block-size", 'b', "base block size");
args_parser.add_positional_argument(path, "File path", "path", Core::ArgsParser::Required::Yes);
args_parser.parse(arguments);
if (block_size_in_kib < 1)
return Error::from_string_literal("Invalid block size");
if (Checked<size_t>::multiplication_would_overflow(block_size_in_kib, KiB))
return Error::from_string_literal("Overflow in block size");
size_t block_size = block_size_in_kib * KiB;
if (!FileSystem::exists(path))
return Error::from_errno(ENOENT);
@ -94,7 +103,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
size_t file_size_rounded = TRY(file->seek(ceil_div(file_size, block_size) * block_size, SeekMode::SetPosition));
TRY(process_file(*file, file_size, file_size_rounded));
TRY(process_file(*file, block_size, file_size, file_size_rounded));
TRY(FileSystem::remove(path, FileSystem::RecursionMode::Disallowed));