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b2fd87950a
Previously, shuf exclusively read input from stdin. This PR adds an option to read from a file using Core::Stream::File. Since a file might contain arbitrary bytes, including null bytes, this PR represents lines as Spans of Bytes instead of Strings.
71 lines
1.8 KiB
C++
71 lines
1.8 KiB
C++
/*
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* Copyright (c) 2021, Ben Wiederhake <BenWiederhake.GitHub@gmx.de>
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* Copyright (c) 2022, Eli Youngs <eli.m.youngs@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Random.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/Stream.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <stdlib.h>
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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TRY(Core::System::pledge("stdio rpath"));
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Core::ArgsParser args_parser;
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StringView path;
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args_parser.add_positional_argument(path, "File", "file", Core::ArgsParser::Required::No);
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args_parser.parse(arguments);
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auto file = TRY(Core::Stream::File::open_file_or_standard_stream(path, Core::Stream::OpenMode::Read));
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ByteBuffer buffer = TRY(file->read_all());
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Vector<Bytes> lines;
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auto bytes = buffer.span();
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size_t line_start = 0;
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size_t line_length = 0;
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for (size_t i = 0; i < bytes.size(); ++i) {
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if (bytes[i] == '\n') {
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lines.append(bytes.slice(line_start, line_length));
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line_start = i + 1;
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line_length = 0;
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} else {
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++line_length;
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}
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}
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if (line_length > 0) {
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lines.append(bytes.slice(line_start));
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}
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if (lines.is_empty())
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return 0;
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// Fisher-Yates shuffle
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Bytes tmp;
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for (size_t i = lines.size() - 1; i >= 1; --i) {
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size_t j = get_random_uniform(i + 1);
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// Swap i and j
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if (i == j)
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continue;
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tmp = lines[j];
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lines[j] = lines[i];
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lines[i] = tmp;
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}
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Array<u8, 1> output_delimiter = { '\n' };
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for (auto const& line : lines) {
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TRY(Core::System::write(STDOUT_FILENO, line));
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TRY(Core::System::write(STDOUT_FILENO, output_delimiter));
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}
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return 0;
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}
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