diff --git a/Userland/Utilities/shuf.cpp b/Userland/Utilities/shuf.cpp new file mode 100644 index 00000000000..79b3d9f60b1 --- /dev/null +++ b/Userland/Utilities/shuf.cpp @@ -0,0 +1,76 @@ +/* + * Copyright (c) 2021, Ben Wiederhake + * 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 +#include +#include +#include +#include +#include + +int main([[maybe_unused]] int argc, [[maybe_unused]] char** argv) +{ + if (pledge("stdio", nullptr) > 0) { + perror("pledge"); + return 1; + } + + Vector lines; + + for (;;) { + char* buffer = nullptr; + ssize_t buflen = 0; + size_t n; + errno = 0; + buflen = getline(&buffer, &n, stdin); + if (buflen == -1 && errno != 0) { + perror("getline"); + exit(1); + } + if (buflen == -1) + break; + lines.append({ buffer, AK::ShouldChomp::Chomp }); + } + + // Fisher-Yates shuffle + String tmp; + for (size_t i = lines.size() - 1; i >= 1; --i) { + size_t j = arc4random_uniform(i + 1); + // Swap i and j + if (i == j) + continue; + tmp = move(lines[j]); + lines[j] = move(lines[i]); + lines[i] = move(tmp); + } + + for (auto& line : lines) { + fputs(line.characters(), stdout); + fputc('\n', stdout); + } + + return 0; +}