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https://github.com/RGBCube/serenity
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c39045b222
* Port it to Core::ArgsParser - even though it doesn't support any options at the moment, it's nice to handle --help and reject other options; * Accept "-" to mean stdin; * Make sure to write out all data that we read, looping if needed; * Detect Useless Uses of Cat and print a cute warning :^)
114 lines
3.6 KiB
C++
114 lines
3.6 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Vector.h>
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#include <LibCore/ArgsParser.h>
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/stat.h>
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#include <string.h>
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#include <unistd.h>
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bool detect_useless_use_of_cat(int argc)
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{
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// I can think of somewhat valid uses of zero-argument cat
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// from a tty to a pipe, so let's allow those.
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if (argc != 2)
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return false;
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struct stat statbuf;
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int rc = fstat(1, &statbuf);
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if (rc < 0)
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return false;
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return S_ISFIFO(statbuf.st_mode);
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}
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int main(int argc, char** argv)
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{
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if (pledge("stdio rpath", nullptr) < 0) {
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perror("pledge");
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return 1;
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}
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Vector<const char*> paths;
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Core::ArgsParser args_parser;
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args_parser.add_positional_argument(paths, "File path", "path", Core::ArgsParser::Required::No);
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args_parser.parse(argc, argv);
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if (detect_useless_use_of_cat(argc))
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fprintf(stderr, "\033[34;1mMeow! Useless use of cat detected\033[0m\n");
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Vector<int> fds;
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if (!paths.is_empty()) {
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for (const char* path : paths) {
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int fd;
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if (StringView { path } == "-") {
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fd = 0;
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} else if ((fd = open(path, O_RDONLY)) == -1) {
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fprintf(stderr, "Failed to open %s: %s\n", path, strerror(errno));
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continue;
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}
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fds.append(fd);
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}
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} else {
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fds.append(0);
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}
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if (pledge("stdio", nullptr) < 0) {
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perror("pledge");
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return 1;
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}
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for (auto& fd : fds) {
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for (;;) {
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char buf[32768];
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ssize_t nread = read(fd, buf, sizeof(buf));
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if (nread == 0)
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break;
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if (nread < 0) {
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perror("read");
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return 2;
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}
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size_t already_written = 0;
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while (already_written < (size_t)nread) {
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ssize_t nwritten = write(1, buf + already_written, nread - already_written);
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if (nwritten < 0) {
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perror("write");
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return 3;
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}
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already_written += nwritten;
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}
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}
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close(fd);
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}
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return 0;
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}
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