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/*
* Copyright (c) 2020, Fei Wu <f.eiwu@yahoo.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Assertions.h>
#include <AK/ByteBuffer.h>
#include <AK/LexicalPath.h>
#include <AK/NumberFormat.h>
#include <AK/String.h>
#include <AK/Vector.h>
#include <LibCore/ArgsParser.h>
#include <LibCore/DateTime.h>
#include <LibCore/DirIterator.h>
#include <LibCore/File.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
struct DuOption {
enum class TimeType {
NotUsed,
Modification,
Access,
Status
};
bool human_readable = false;
bool all = false;
bool apparent_size = false;
int threshold = 0;
TimeType time_type = TimeType::NotUsed;
Vector<String> excluded_patterns;
};
static int parse_args(int argc, char** argv, Vector<String>& files, DuOption& du_option, int& max_depth);
static int print_space_usage(const String& path, const DuOption& du_option, int max_depth);
int main(int argc, char** argv)
{
Vector<String> files;
DuOption du_option;
int max_depth = INT_MAX;
if (parse_args(argc, argv, files, du_option, max_depth))
return 1;
for (const auto& file : files) {
if (print_space_usage(file, du_option, max_depth))
return 1;
}
return 0;
}
int parse_args(int argc, char** argv, Vector<String>& files, DuOption& du_option, int& max_depth)
{
bool summarize = false;
const char* pattern = nullptr;
const char* exclude_from = nullptr;
Vector<const char*> files_to_process;
Core::ArgsParser::Option time_option {
true,
"Show time of type time-type of any file in the directory, or any of its subdirectories. "
"Available choices: mtime, modification, ctime, status, use, atime, access",
"time",
0,
"time-type",
[&du_option](const char* s) {
if (!strcmp(s, "mtime") || !strcmp(s, "modification"))
du_option.time_type = DuOption::TimeType::Modification;
else if (!strcmp(s, "ctime") || !strcmp(s, "status") || !strcmp(s, "use"))
du_option.time_type = DuOption::TimeType::Status;
else if (!strcmp(s, "atime") || !strcmp(s, "access"))
du_option.time_type = DuOption::TimeType::Access;
else
return false;
return true;
}
};
Core::ArgsParser args_parser;
args_parser.set_general_help("Display actual or apparent disk usage of files or directories.");
args_parser.add_option(du_option.all, "Write counts for all files, not just directories", "all", 'a');
args_parser.add_option(du_option.apparent_size, "Print apparent sizes, rather than disk usage", "apparent-size", 0);
args_parser.add_option(du_option.human_readable, "Print human-readable sizes", "human-readable", 'h');
args_parser.add_option(max_depth, "Print the total for a directory or file only if it is N or fewer levels below the command line argument", "max-depth", 'd', "N");
args_parser.add_option(summarize, "Display only a total for each argument", "summarize", 's');
args_parser.add_option(du_option.threshold, "Exclude entries smaller than size if positive, or entries greater than size if negative", "threshold", 't', "size");
args_parser.add_option(move(time_option));
args_parser.add_option(pattern, "Exclude files that match pattern", "exclude", 0, "pattern");
args_parser.add_option(exclude_from, "Exclude files that match any pattern in file", "exclude_from", 'X', "file");
args_parser.add_positional_argument(files_to_process, "File to process", "file", Core::ArgsParser::Required::No);
args_parser.parse(argc, argv);
if (summarize)
max_depth = 0;
if (pattern)
du_option.excluded_patterns.append(pattern);
if (exclude_from) {
auto file = Core::File::construct(exclude_from);
bool success = file->open(Core::OpenMode::ReadOnly);
VERIFY(success);
const auto buff = file->read_all();
if (!buff.is_empty()) {
String patterns = String::copy(buff, Chomp);
du_option.excluded_patterns.extend(patterns.split('\n'));
}
}
for (auto* file : files_to_process) {
files.append(file);
}
if (files.is_empty()) {
files.append(".");
}
return 0;
}
int print_space_usage(const String& path, const DuOption& du_option, int max_depth)
{
struct stat path_stat;
if (lstat(path.characters(), &path_stat) < 0) {
perror("lstat");
return 1;
}
int ret = 0;
if (--max_depth >= 0 && S_ISDIR(path_stat.st_mode)) {
auto di = Core::DirIterator(path, Core::DirIterator::SkipParentAndBaseDir);
if (di.has_error()) {
warnln("du: cannot read directory '{}': {}", path, di.error_string());
ret = 1;
}
while (di.has_next()) {
const auto child_path = di.next_full_path();
if (du_option.all || Core::File::is_directory(child_path)) {
if (print_space_usage(child_path, du_option, max_depth))
return 1;
}
}
}
const auto basename = LexicalPath::basename(path);
for (const auto& pattern : du_option.excluded_patterns) {
if (basename.matches(pattern, CaseSensitivity::CaseSensitive))
return 0;
}
off_t size = path_stat.st_size;
if (du_option.apparent_size) {
const auto block_size = 512;
size = path_stat.st_blocks * block_size;
}
if ((du_option.threshold > 0 && size < du_option.threshold) || (du_option.threshold < 0 && size > -du_option.threshold))
return 0;
if (du_option.human_readable) {
out("{}", human_readable_size(size));
} else {
const long long block_size = 1024;
size = size / block_size + (size % block_size != 0);
out("{}", size);
}
if (du_option.time_type == DuOption::TimeType::NotUsed) {
outln("\t{}", path);
} else {
auto time = path_stat.st_mtime;
switch (du_option.time_type) {
case DuOption::TimeType::Access:
time = path_stat.st_atime;
break;
case DuOption::TimeType::Status:
time = path_stat.st_ctime;
break;
default:
break;
}
const auto formatted_time = Core::DateTime::from_timestamp(time).to_string();
outln("\t{}\t{}", formatted_time, path);
}
return ret;
}
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