mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-11 13:36:13 +03:00
cmp: Implement cmp(1)
This commit is contained in:
parent
25c2a76d10
commit
1ba6974b60
Notes:
sideshowbarker
2024-07-17 17:06:36 +09:00
Author: https://github.com/AtkinsSJ Commit: https://github.com/SerenityOS/serenity/commit/1ba6974b60 Pull-request: https://github.com/SerenityOS/serenity/pull/13137 Reviewed-by: https://github.com/bgianfo ✅
@ -71,6 +71,7 @@ target_link_libraries(chown LibMain)
|
||||
target_link_libraries(chres LibGUI LibMain)
|
||||
target_link_libraries(cksum LibCrypto LibMain)
|
||||
target_link_libraries(clear LibMain)
|
||||
target_link_libraries(cmp LibMain)
|
||||
target_link_libraries(comm LibMain)
|
||||
target_link_libraries(config LibConfig LibMain)
|
||||
target_link_libraries(copy LibGUI LibMain)
|
||||
|
101
Userland/Utilities/cmp.cpp
Normal file
101
Userland/Utilities/cmp.cpp
Normal file
@ -0,0 +1,101 @@
|
||||
/*
|
||||
* Copyright (c) 2022, Sam Atkins <atkinssj@serenityos.org>
|
||||
*
|
||||
* SPDX-License-Identifier: BSD-2-Clause
|
||||
*/
|
||||
|
||||
#include <LibCore/ArgsParser.h>
|
||||
#include <LibCore/Stream.h>
|
||||
#include <LibCore/System.h>
|
||||
#include <LibMain/Main.h>
|
||||
#include <unistd.h>
|
||||
|
||||
static ErrorOr<NonnullOwnPtr<Core::Stream::BufferedFile>> open_file_or_stdin(String const& filename)
|
||||
{
|
||||
OwnPtr<Core::Stream::File> file;
|
||||
if (filename == "-") {
|
||||
file = TRY(Core::Stream::File::adopt_fd(STDIN_FILENO, Core::Stream::OpenMode::Read));
|
||||
} else {
|
||||
file = TRY(Core::Stream::File::open(filename, Core::Stream::OpenMode::Read));
|
||||
}
|
||||
return TRY(Core::Stream::BufferedFile::create(file.release_nonnull()));
|
||||
}
|
||||
|
||||
ErrorOr<int> serenity_main(Main::Arguments arguments)
|
||||
{
|
||||
Main::set_return_code_for_errors(2);
|
||||
TRY(Core::System::pledge("stdio rpath"));
|
||||
|
||||
Core::ArgsParser parser;
|
||||
String filename1;
|
||||
String filename2;
|
||||
bool verbose = false;
|
||||
bool silent = false;
|
||||
|
||||
parser.set_general_help("Compare two files, and report the first byte that does not match. Returns 0 if files are identical, or 1 if they differ.");
|
||||
parser.add_positional_argument(filename1, "First file to compare", "file1", Core::ArgsParser::Required::Yes);
|
||||
parser.add_positional_argument(filename2, "Second file to compare", "file2", Core::ArgsParser::Required::Yes);
|
||||
parser.add_option(verbose, "Output every byte mismatch, not just the first", "verbose", 'l');
|
||||
parser.add_option(silent, "Disable all output", "silent", 's');
|
||||
parser.parse(arguments);
|
||||
|
||||
// When opening STDIN as both files, the results are undefined.
|
||||
// Let's just report that it matches.
|
||||
if (filename1 == "-" && filename2 == "-")
|
||||
return 0;
|
||||
|
||||
auto file1 = TRY(open_file_or_stdin(filename1));
|
||||
auto file2 = TRY(open_file_or_stdin(filename2));
|
||||
TRY(Core::System::unveil(nullptr, nullptr));
|
||||
|
||||
int line_number = 1;
|
||||
int byte_number = 1;
|
||||
Array<u8, 1> buffer1;
|
||||
Array<u8, 1> buffer2;
|
||||
bool files_match = true;
|
||||
|
||||
auto report_mismatch = [&]() {
|
||||
files_match = false;
|
||||
if (silent)
|
||||
return;
|
||||
if (verbose)
|
||||
outln("{} {:o} {:o}", byte_number, buffer1[0], buffer2[0]);
|
||||
else
|
||||
outln("{} {} differ: char {}, line {}", filename1, filename2, byte_number, line_number);
|
||||
};
|
||||
|
||||
auto report_eof = [&](auto& shorter_file_name) {
|
||||
files_match = false;
|
||||
if (silent)
|
||||
return;
|
||||
auto additional_info = verbose
|
||||
? String::formatted(" after byte {}", byte_number)
|
||||
: String::formatted(" after byte {}, line {}", byte_number, line_number);
|
||||
warnln("cmp: EOF on {}{}", shorter_file_name, additional_info);
|
||||
};
|
||||
|
||||
while (true) {
|
||||
TRY(file1->read(buffer1));
|
||||
TRY(file2->read(buffer2));
|
||||
|
||||
if (file1->is_eof() && file2->is_eof())
|
||||
break;
|
||||
|
||||
if (file1->is_eof() || file2->is_eof()) {
|
||||
report_eof(file1->is_eof() ? filename1 : filename2);
|
||||
break;
|
||||
}
|
||||
|
||||
if (buffer1[0] != buffer2[0]) {
|
||||
report_mismatch();
|
||||
if (!verbose)
|
||||
break;
|
||||
}
|
||||
|
||||
if (buffer1[0] == '\n')
|
||||
++line_number;
|
||||
++byte_number;
|
||||
}
|
||||
|
||||
return files_match ? 0 : 1;
|
||||
}
|
Loading…
Reference in New Issue
Block a user