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60 lines
1.3 KiB
C++
60 lines
1.3 KiB
C++
/*
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* Copyright (c) 2021, Ben Wiederhake <BenWiederhake.GitHub@gmx.de>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Random.h>
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#include <AK/String.h>
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#include <AK/Vector.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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ErrorOr<int> serenity_main([[maybe_unused]] Main::Arguments arguments)
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{
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TRY(Core::System::pledge("stdio"sv));
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Vector<String> lines;
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char* buffer = nullptr;
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for (;;) {
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size_t n = 0;
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errno = 0;
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ssize_t buflen = getline(&buffer, &n, stdin);
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if (buflen == -1 && errno != 0) {
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perror("getline");
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exit(1);
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}
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if (buflen == -1)
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break;
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lines.append({ buffer, AK::ShouldChomp::Chomp });
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}
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free(buffer);
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if (lines.is_empty())
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return 0;
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// Fisher-Yates shuffle
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String tmp;
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for (size_t i = lines.size() - 1; i >= 1; --i) {
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size_t j = get_random_uniform(i + 1);
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// Swap i and j
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if (i == j)
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continue;
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tmp = move(lines[j]);
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lines[j] = move(lines[i]);
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lines[i] = move(tmp);
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}
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for (auto& line : lines) {
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fputs(line.characters(), stdout);
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fputc('\n', stdout);
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}
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return 0;
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}
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