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/*
* Copyright (c) 2018-2020, 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 <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
TRY(Core::System::pledge("stdio rpath", nullptr));
Vector<String> 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()) {
for (auto const& path : paths) {
int fd;
if (path == "-") {
fd = 0;
} else if ((fd = open(path.characters(), O_RDONLY)) == -1) {
warnln("Failed to open {}: {}", path, strerror(errno));
continue;
}
fds.append(fd);
}
} else {
fds.append(0);
}
TRY(Core::System::pledge("stdio", nullptr));
for (auto& fd : fds) {
for (;;) {
char buf[32768];
ssize_t nread = read(fd, buf, sizeof(buf));
if (nread == 0)
break;
if (nread < 0) {
perror("read");
return 2;
}
size_t already_written = 0;
while (already_written < (size_t)nread) {
ssize_t nwritten = write(1, buf + already_written, nread - already_written);
if (nwritten < 0) {
perror("write");
return 3;
}
already_written += nwritten;
}
}
close(fd);
}
return 0;
}
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