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/*
* Copyright (c) 2021, Thomas Voss <mail@thomasvoss.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibCore/ArgsParser.h>
#include <LibCore/System.h>
#include <LibMain/Main.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
TRY(Core::System::pledge("stdio rpath"sv));
Vector<StringView> paths;
Core::ArgsParser args_parser;
args_parser.set_general_help("Concatente files to stdout with each line in reverse.");
args_parser.add_positional_argument(paths, "File path", "path", Core::ArgsParser::Required::No);
args_parser.parse(arguments);
Vector<FILE*> streams;
auto num_paths = paths.size();
streams.ensure_capacity(num_paths ? num_paths : 1);
if (!paths.is_empty()) {
for (auto const& path : paths) {
if (path == "-") {
streams.append(stdin);
} else {
FILE* stream = fopen(String(path).characters(), "r");
if (!stream) {
warnln("Failed to open {}: {}", path, strerror(errno));
continue;
}
streams.append(stream);
}
}
} else {
streams.append(stdin);
}
char* buffer = nullptr;
ScopeGuard guard = [&] {
free(buffer);
for (auto* stream : streams) {
// If the user passes '-' as an argument multiple times, then we will end up trying to
// close stdin multiple times. This will cause `fclose()` to fail but with no error, so
// we need to manually check errno.
if (fclose(stream) && errno != 0) {
perror("fclose");
}
}
};
TRY(Core::System::pledge("stdio"sv));
for (auto* stream : streams) {
for (;;) {
size_t n = 0;
errno = 0;
ssize_t buflen = getline(&buffer, &n, stream);
if (buflen == -1) {
if (errno != 0) {
perror("getline");
return 1;
}
break;
}
outln("{}", String { buffer, Chomp }.reverse());
}
}
return 0;
}
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