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120 lines
3.3 KiB
C++
120 lines
3.3 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@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/Array.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/File.h>
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#include <LibMain/Main.h>
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#include <ctype.h>
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#include <string.h>
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static constexpr size_t LINE_LENGTH_BYTES = 16;
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enum class State {
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Print,
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PrintFiller,
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SkipPrint
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};
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ErrorOr<int> serenity_main(Main::Arguments args)
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{
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Core::ArgsParser args_parser;
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char const* path = nullptr;
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bool verbose = false;
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args_parser.add_positional_argument(path, "Input", "input", Core::ArgsParser::Required::No);
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args_parser.add_option(verbose, "Display all input data", "verbose", 'v');
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args_parser.parse(args);
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RefPtr<Core::File> file;
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if (!path)
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file = Core::File::standard_input();
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else
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file = TRY(Core::File::open(path, Core::OpenMode::ReadOnly));
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auto print_line = [](u8* buf, size_t size) {
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VERIFY(size <= LINE_LENGTH_BYTES);
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for (size_t i = 0; i < LINE_LENGTH_BYTES; ++i) {
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if (i < size)
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out("{:02x} ", buf[i]);
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else
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out(" ");
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if (i == 7)
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out(" ");
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}
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out(" |");
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for (size_t i = 0; i < size; ++i) {
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if (isprint(buf[i]))
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putchar(buf[i]);
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else
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putchar('.');
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}
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putchar('|');
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putchar('\n');
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};
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Array<u8, BUFSIZ> contents;
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Span<u8> previous_line;
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static_assert(LINE_LENGTH_BYTES * 2 <= contents.size(), "Buffer is too small?!");
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size_t contents_size = 0;
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int nread;
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auto state = State::Print;
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while (true) {
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nread = file->read(&contents[contents_size], BUFSIZ - contents_size);
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if (nread <= 0)
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break;
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contents_size += nread;
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size_t offset;
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for (offset = 0; offset + LINE_LENGTH_BYTES - 1 < contents_size; offset += LINE_LENGTH_BYTES) {
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if (verbose) {
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print_line(&contents[offset], LINE_LENGTH_BYTES);
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continue;
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}
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auto current_line = contents.span().slice(offset, LINE_LENGTH_BYTES);
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bool is_same_contents = (current_line == previous_line);
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if (!is_same_contents)
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state = State::Print;
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else if (is_same_contents && (state != State::SkipPrint))
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state = State::PrintFiller;
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// Coalesce repeating lines
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switch (state) {
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case State::Print:
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print_line(&contents[offset], LINE_LENGTH_BYTES);
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break;
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case State::PrintFiller:
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outln("*");
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state = State::SkipPrint;
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break;
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case State::SkipPrint:
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break;
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}
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previous_line = current_line;
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}
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contents_size -= offset;
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VERIFY(contents_size < LINE_LENGTH_BYTES);
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// If we managed to make the buffer exactly full, &contents[BUFSIZ] would blow up.
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if (contents_size > 0) {
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// Regions cannot overlap due to above static_assert.
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memcpy(&contents[0], &contents[offset], contents_size);
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}
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}
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VERIFY(contents_size <= LINE_LENGTH_BYTES - 1);
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if (contents_size > 0)
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print_line(&contents[0], contents_size);
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return 0;
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}
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