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Userland: Implement tac command

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Nobody care about tac :^).
This commit is contained in:
Federico Guerinoni 2021-04-07 23:01:15 +02:00 committed by Andreas Kling
parent d19180433f
commit c841012f56
Notes: sideshowbarker 2024-07-18 19:00:28 +09:00 
Author: https://github.com/guerinoni
Commit: https://github.com/SerenityOS/serenity/commit/c841012f569
Pull-request: https://github.com/SerenityOS/serenity/pull/6187
Reviewed-by: https://github.com/IdanHo
Reviewed-by: https://github.com/awesomekling
1 changed files with 69 additions and 0 deletions
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Userland/Utilities/tac.cpp Normal file
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/*
* Copyright (c) 2021, Federico Guerinoni <guerinoni.federico@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/Vector.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/File.h>
#include <unistd.h>
void print_lines(const Vector<String>& vec);
int main(int argc, char** argv)
{
if (pledge("stdio rpath", nullptr) < 0) {
perror("pledge");
return 1;
}
const char* path = nullptr;
Core::ArgsParser args_parser;
args_parser.set_general_help("Concatenate files or pipes to stdout, last line first.");
args_parser.add_positional_argument(path, "File path", "path", Core::ArgsParser::Required::No);
args_parser.parse(argc, argv);
RefPtr<Core::File> file;
if (path == nullptr) {
file = Core::File::standard_input();
} else {
auto file_or_error = Core::File::open(path, Core::File::ReadOnly);
if (file_or_error.is_error()) {
warnln("Failed to open {}: {}", path, file_or_error.error());
return 1;
}
file = file_or_error.value();
}
Vector<String> lines;
while (file->can_read_line()) {
auto line = file->read_line();
lines.append(line);
}
for (int i = lines.size() - 1; i >= 0; --i)
outln("{}", lines[i]);
return 0;
}