mirror of
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98 lines
3.1 KiB
C++
98 lines
3.1 KiB
C++
/*
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* Copyright (c) 2022-2023, Sam Atkins <atkinssj@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/String.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/File.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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static ErrorOr<NonnullOwnPtr<Core::InputBufferedFile>> open_file_or_stdin(StringView filename)
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{
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auto file = TRY(Core::File::open_file_or_standard_stream(filename, Core::File::OpenMode::Read));
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return TRY(Core::InputBufferedFile::create(move(file)));
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}
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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Main::set_return_code_for_errors(2);
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TRY(Core::System::pledge("stdio rpath"));
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Core::ArgsParser parser;
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StringView filename1;
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StringView filename2;
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bool verbose = false;
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bool silent = false;
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parser.set_general_help("Compare two files, and report the first byte that does not match. Returns 0 if files are identical, or 1 if they differ.");
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parser.add_positional_argument(filename1, "First file to compare", "file1", Core::ArgsParser::Required::Yes);
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parser.add_positional_argument(filename2, "Second file to compare", "file2", Core::ArgsParser::Required::Yes);
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parser.add_option(verbose, "Output every byte mismatch, not just the first", "verbose", 'l');
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parser.add_option(silent, "Disable all output", "silent", 's');
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parser.parse(arguments);
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// When opening STDIN as both files, the results are undefined.
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// Let's just report that it matches.
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if (filename1 == "-" && filename2 == "-")
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return 0;
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auto file1 = TRY(open_file_or_stdin(filename1));
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auto file2 = TRY(open_file_or_stdin(filename2));
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TRY(Core::System::unveil(nullptr, nullptr));
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int line_number = 1;
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int byte_number = 1;
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Array<u8, 1> buffer1;
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Array<u8, 1> buffer2;
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bool files_match = true;
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auto report_mismatch = [&]() {
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files_match = false;
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if (silent)
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return;
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if (verbose)
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outln("{} {:o} {:o}", byte_number, buffer1[0], buffer2[0]);
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else
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outln("{} {} differ: char {}, line {}", filename1, filename2, byte_number, line_number);
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};
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auto report_eof = [&](auto& shorter_file_name) -> ErrorOr<void> {
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files_match = false;
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if (silent)
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return {};
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auto additional_info = verbose
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? TRY(String::formatted(" after byte {}", byte_number))
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: TRY(String::formatted(" after byte {}, line {}", byte_number, line_number));
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warnln("cmp: EOF on {}{}", shorter_file_name, additional_info);
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return {};
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};
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while (true) {
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TRY(file1->read_some(buffer1));
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TRY(file2->read_some(buffer2));
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if (file1->is_eof() && file2->is_eof())
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break;
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if (file1->is_eof() || file2->is_eof()) {
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TRY(report_eof(file1->is_eof() ? filename1 : filename2));
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break;
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}
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if (buffer1[0] != buffer2[0]) {
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report_mismatch();
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if (!verbose)
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break;
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}
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if (buffer1[0] == '\n')
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++line_number;
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++byte_number;
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}
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return files_match ? 0 : 1;
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}
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