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/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Vector.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/System.h>
#include <LibMain/Main.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
TRY(Core::System::pledge("stdio rpath", nullptr));
Vector<StringView> paths;
Core::ArgsParser args_parser;
args_parser.set_general_help("Concatenate files or pipes to stdout.");
args_parser.add_positional_argument(paths, "File path", "path", Core::ArgsParser::Required::No);
args_parser.parse(arguments);
Vector<int> fds;
if (paths.is_empty()) {
TRY(fds.try_append(STDIN_FILENO));
} else {
for (auto const& path : paths) {
int fd;
if (path == "-") {
fd = 0;
} else {
auto fd_or_error = Core::System::open(path, O_RDONLY);
if (fd_or_error.is_error()) {
warnln("Failed to open {}: {}", path, fd_or_error.error());
continue;
}
fd = fd_or_error.release_value();
}
TRY(fds.try_append(fd));
}
}
TRY(Core::System::pledge("stdio", nullptr));
Array<u8, 32768> buffer;
for (auto& fd : fds) {
for (;;) {
auto buffer_span = buffer.span();
auto nread = TRY(Core::System::read(fd, buffer_span));
if (nread == 0)
break;
buffer_span = buffer_span.trim(nread);
while (!buffer_span.is_empty()) {
auto already_written = TRY(Core::System::write(STDOUT_FILENO, buffer_span));
buffer_span = buffer_span.slice(already_written);
}
}
TRY(Core::System::close(fd));
}
return 0;
}
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