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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2022, Eli Youngs <eli.m.youngs@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Array.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <LibCore/System.h>
#include <LibMain/Main.h>
#include <ctype.h>
#include <string.h>
static constexpr size_t LINE_LENGTH_BYTES = 16;
enum class State {
Print,
PrintFiller,
SkipPrint
};
ErrorOr<int> serenity_main(Main::Arguments args)
{
TRY(Core::System::pledge("stdio rpath"));
Core::ArgsParser args_parser;
StringView path;
bool verbose = false;
Optional<size_t> max_bytes;
Optional<size_t> seek_to;
args_parser.add_positional_argument(path, "Input", "input", Core::ArgsParser::Required::No);
args_parser.add_option(verbose, "Display all input data", "verbose", 'v');
args_parser.add_option(max_bytes, "Truncate to a fixed number of bytes", nullptr, 'n', "bytes");
args_parser.add_option(seek_to, "Seek to a byte offset", "seek", 's', "offset");
args_parser.parse(args);
auto file = TRY(Core::File::open_file_or_standard_stream(path, Core::File::OpenMode::Read));
if (seek_to.has_value())
TRY(file->seek(seek_to.value(), SeekMode::SetPosition));
auto print_line = [](Bytes line) {
VERIFY(line.size() <= LINE_LENGTH_BYTES);
for (size_t i = 0; i < LINE_LENGTH_BYTES; ++i) {
if (i < line.size())
out("{:02x} ", line[i]);
else
out(" ");
if (i == 7)
out(" ");
}
out(" |");
for (auto const& byte : line) {
if (isprint(byte))
putchar(byte);
else
putchar('.');
}
putchar('|');
putchar('\n');
};
Array<u8, BUFSIZ> contents;
Bytes bytes;
Bytes previous_line;
static_assert(LINE_LENGTH_BYTES * 2 <= contents.size(), "Buffer is too small?!");
size_t total_bytes_read = 0;
auto state = State::Print;
bool is_input_remaining = true;
while (is_input_remaining) {
auto bytes_to_read = contents.size() - bytes.size();
if (max_bytes.has_value()) {
auto bytes_remaining = max_bytes.value() - total_bytes_read;
if (bytes_remaining < bytes_to_read) {
bytes_to_read = bytes_remaining;
is_input_remaining = false;
}
}
bytes = contents.span().slice(0, bytes_to_read);
bytes = TRY(file->read_some(bytes));
total_bytes_read += bytes.size();
if (bytes.size() < bytes_to_read) {
is_input_remaining = false;
}
while (bytes.size() > LINE_LENGTH_BYTES) {
auto current_line = bytes.slice(0, LINE_LENGTH_BYTES);
bytes = bytes.slice(LINE_LENGTH_BYTES);
if (verbose) {
print_line(current_line);
continue;
}
bool is_same_contents = (current_line == previous_line);
if (!is_same_contents)
state = State::Print;
else if (is_same_contents && (state != State::SkipPrint))
state = State::PrintFiller;
// Coalesce repeating lines
switch (state) {
case State::Print:
print_line(current_line);
break;
case State::PrintFiller:
outln("*");
state = State::SkipPrint;
break;
case State::SkipPrint:
break;
}
previous_line = current_line;
}
}
if (bytes.size() > 0)
print_line(bytes);
return 0;
}
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