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6b7ce19161
These instances were detected by searching for files that include stdlib.h, but don't match the regex: \\b(_abort|abort|abs|aligned_alloc|arc4random|arc4random_buf|arc4random_ uniform|atexit|atof|atoi|atol|atoll|bsearch|calloc|clearenv|div|div_t|ex it|_Exit|EXIT_FAILURE|EXIT_SUCCESS|free|getenv|getprogname|grantpt|labs| ldiv|ldiv_t|llabs|lldiv|lldiv_t|malloc|malloc_good_size|malloc_size|mble n|mbstowcs|mbtowc|mkdtemp|mkstemp|mkstemps|mktemp|posix_memalign|posix_o penpt|ptsname|ptsname_r|putenv|qsort|qsort_r|rand|RAND_MAX|random|reallo c|realpath|secure_getenv|serenity_dump_malloc_stats|serenity_setenv|sete nv|setprogname|srand|srandom|strtod|strtof|strtol|strtold|strtoll|strtou l|strtoull|system|unlockpt|unsetenv|wcstombs|wctomb)\\b (Without the linebreaks.) This regex is pessimistic, so there might be more files that don't actually use anything from the stdlib. In theory, one might use LibCPP to detect things like this automatically, but let's do this one step after another.
66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
/*
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* Copyright (c) 2021, Ben Wiederhake <BenWiederhake.GitHub@gmx.de>
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* Copyright (c) 2022, Eli Youngs <eli.m.youngs@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/DeprecatedString.h>
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#include <AK/Random.h>
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#include <AK/Vector.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/Stream.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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TRY(Core::System::pledge("stdio rpath"));
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Core::ArgsParser args_parser;
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StringView path;
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Optional<size_t> head_count;
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bool is_zero_terminated = false;
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args_parser.add_positional_argument(path, "File", "file", Core::ArgsParser::Required::No);
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args_parser.add_option(head_count, "Output at most \"count\" lines", "head-count", 'n', "count");
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args_parser.add_option(is_zero_terminated, "Split input on \\0, not newline", "zero-terminated", 'z');
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args_parser.parse(arguments);
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auto file = TRY(Core::Stream::File::open_file_or_standard_stream(path, Core::Stream::OpenMode::Read));
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ByteBuffer buffer = TRY(file->read_until_eof());
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u8 input_delimiter = is_zero_terminated ? '\0' : '\n';
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Vector<Bytes> lines;
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auto bytes = buffer.span();
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size_t line_start = 0;
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size_t line_length = 0;
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for (size_t i = 0; i < bytes.size(); ++i) {
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if (bytes[i] == input_delimiter) {
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lines.append(bytes.slice(line_start, line_length));
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line_start = i + 1;
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line_length = 0;
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} else {
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++line_length;
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}
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}
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if (line_length > 0) {
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lines.append(bytes.slice(line_start));
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}
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if (lines.is_empty())
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return 0;
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AK::shuffle(lines);
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Array<u8, 1> output_delimiter = { '\n' };
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for (size_t i = 0; i < min(head_count.value_or(lines.size()), lines.size()); ++i) {
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TRY(Core::System::write(STDOUT_FILENO, lines.at(i)));
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TRY(Core::System::write(STDOUT_FILENO, output_delimiter));
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}
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return 0;
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}
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