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e2e7c4d574
In a bunch of cases, this actually ends up simplifying the code as
to_number will handle something such as:
```
Optional<I> opt;
if constexpr (IsSigned<I>)
opt = view.to_int<I>();
else
opt = view.to_uint<I>();
```
For us.
The main goal here however is to have a single generic number conversion
API between all of the String classes.
266 lines
10 KiB
C++
266 lines
10 KiB
C++
/*
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2022, Ariel Don <ariel@arieldon.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/CharacterTypes.h>
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#include <AK/CheckedFormatString.h>
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#include <AK/GenericLexer.h>
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#include <AK/Time.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/System.h>
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#include <LibFileSystem/FileSystem.h>
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#include <LibMain/Main.h>
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#include <LibTimeZone/TimeZone.h>
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#include <ctype.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 <time.h>
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static ByteString program_name;
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template<typename... Parameters>
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[[noreturn]] static void err(CheckedFormatString<Parameters...>&& fmtstr, Parameters const&... parameters)
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{
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warn("{}: ", program_name);
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warnln(move(fmtstr), parameters...);
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exit(1);
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}
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inline bool validate_timestamp(unsigned year, unsigned month, unsigned day, unsigned hour, unsigned minute, unsigned second)
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{
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return (year >= 1970) && (month >= 1 && month <= 12) && (day >= 1 && day <= static_cast<unsigned>(days_in_month(year, month))) && (hour <= 23) && (minute <= 59) && (second <= 59);
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}
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static void parse_time(StringView input_time, timespec& atime, timespec& mtime)
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{
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// Parse [[CC]YY]MMDDhhmm[.SS] format, where brackets signify optional
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// parameters.
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if (input_time.length() < 8)
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err("invalid time format '{}' -- too short", input_time);
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else if (input_time.length() > 15)
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err("invalid time format '{}' -- too long", input_time);
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Vector<u8> parameters;
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GenericLexer lexer(input_time);
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unsigned year, month, day, hour, minute, second;
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auto lex_number = [&]() {
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auto literal = lexer.consume(2);
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if (literal.length() < 2)
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err("invalid time format '{}' -- expected 2 digits per parameter", input_time);
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auto maybe_parameter = literal.to_number<unsigned>();
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if (maybe_parameter.has_value())
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parameters.append(maybe_parameter.value());
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else
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err("invalid time format '{}'", input_time);
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};
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while (!lexer.is_eof() && lexer.next_is(is_ascii_digit))
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lex_number();
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if (parameters.size() > 6)
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err("invalid time format '{}' -- too many parameters", input_time);
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if (lexer.consume_specific('.')) {
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lex_number();
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second = parameters.take_last();
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} else {
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second = 0;
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}
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auto current_year = seconds_since_epoch_to_year(time(nullptr));
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auto current_century = current_year / 100;
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if (parameters.size() == 6)
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year = parameters.take_first() * 100 + parameters.take_first();
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else if (parameters.size() == 5)
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year = current_century * 100 + parameters.take_first();
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else
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year = current_year;
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minute = parameters.take_last();
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hour = parameters.take_last();
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day = parameters.take_last();
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month = parameters.take_last();
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if (validate_timestamp(year, month, day, hour, minute, second))
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atime = mtime = AK::UnixDateTime::from_unix_time_parts(year, month, day, hour, minute, second, 0).to_timespec();
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else
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err("invalid time format '{}'", input_time);
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}
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static void parse_datetime(StringView input_datetime, timespec& atime, timespec& mtime)
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{
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// Parse YYYY-MM-DDThh:mm:SS[.frac][tz] or YYYY-MM-DDThh:mm:SS[,frac][tz]
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// formats, where brackets signify optional parameters.
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GenericLexer lexer(input_datetime);
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unsigned year, month, day, hour, minute, second, millisecond;
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StringView time_zone;
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auto lex_number = [&](unsigned& value, size_t n) {
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auto maybe_value = lexer.consume(n).to_number<unsigned>();
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if (!maybe_value.has_value())
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err("invalid datetime format '{}' -- expected number at index {}", input_datetime, lexer.tell());
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else
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value = maybe_value.value();
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};
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lex_number(year, 4);
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if (!lexer.consume_specific('-'))
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err("invalid datetime format '{}' -- expected '-' after year", input_datetime);
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lex_number(month, 2);
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if (!lexer.consume_specific('-'))
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err("invalid datetime format '{}' -- expected '-' after month", input_datetime);
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lex_number(day, 2);
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// Parse the time designator -- a single 'T' or ' ' according to POSIX.
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if (!lexer.consume_specific('T') && !lexer.consume_specific(' '))
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err("invalid datetime format '{}' -- expected 'T' or ' ' for time designator", input_datetime);
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lex_number(hour, 2);
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if (!lexer.consume_specific(':'))
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err("invalid datetime format '{}' -- expected ':' after hour", input_datetime);
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lex_number(minute, 2);
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if (!lexer.consume_specific(':'))
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err("invalid datetime format '{}' -- expected ':' after minute", input_datetime);
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lex_number(second, 2);
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millisecond = 0;
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if (!lexer.is_eof()) {
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if (lexer.consume_specific(',') || lexer.consume_specific('.')) {
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auto fractional_second = lexer.consume_while(is_ascii_digit);
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if (fractional_second.is_empty())
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err("invalid datetime format '{}' -- expected floating seconds", input_datetime);
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for (u8 i = 0; i < 3 && i < fractional_second.length(); ++i) {
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unsigned n = fractional_second[i] - '0';
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switch (i) {
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case 0:
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millisecond += 100 * n;
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break;
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case 1:
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millisecond += 10 * n;
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break;
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case 2:
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millisecond += n;
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break;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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}
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time_zone = lexer.consume_all();
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if (!time_zone.is_empty() && time_zone != "Z")
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err("invalid datetime format '{}' -- failed to parse time zone", input_datetime);
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}
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if (validate_timestamp(year, month, day, hour, minute, second)) {
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auto timestamp = AK::UnixDateTime::from_unix_time_parts(year, month, day, hour, minute, second, millisecond);
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auto time = timestamp.to_timespec();
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if (time_zone.is_empty() && TimeZone::system_time_zone() != "UTC") {
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auto offset = TimeZone::get_time_zone_offset(TimeZone::system_time_zone(), timestamp);
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if (offset.has_value())
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time.tv_sec -= offset.value().seconds;
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else
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err("failed to get the system time zone");
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}
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atime = mtime = time;
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} else {
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err("invalid datetime format '{}'", input_datetime);
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}
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}
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static void reference_time(StringView reference_path, timespec& atime, timespec& mtime)
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{
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auto maybe_buffer = Core::System::stat(reference_path);
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if (maybe_buffer.is_error())
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err("failed to reference times of '{}': {}", reference_path, maybe_buffer.release_error());
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auto buffer = maybe_buffer.release_value();
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atime.tv_sec = buffer.st_atime;
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atime.tv_nsec = buffer.st_atim.tv_nsec;
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mtime.tv_sec = buffer.st_mtime;
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mtime.tv_nsec = buffer.st_mtim.tv_nsec;
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}
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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 cpath fattr"));
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program_name = arguments.strings[0];
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Vector<ByteString> paths;
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timespec times[2];
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auto& atime = times[0];
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auto& mtime = times[1];
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bool update_atime = false;
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bool update_mtime = false;
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bool no_create_file = false;
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ByteString input_datetime = "";
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ByteString input_time = "";
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ByteString reference_path = "";
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Core::ArgsParser args_parser;
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args_parser.set_general_help("Create a file or update file access time and/or modification time.");
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args_parser.add_ignored(nullptr, 'f');
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args_parser.add_option(update_atime, "Change access time of file", nullptr, 'a');
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args_parser.add_option(no_create_file, "Do not create a file if it does not exist", nullptr, 'c');
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args_parser.add_option(update_mtime, "Change modification time of file", nullptr, 'm');
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args_parser.add_option(input_datetime, "Use specified datetime instead of current time", nullptr, 'd', "datetime");
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args_parser.add_option(input_time, "Use specified time instead of current time", nullptr, 't', "time");
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args_parser.add_option(reference_path, "Use time of file specified by reference path instead of current time", nullptr, 'r', "reference");
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args_parser.add_positional_argument(paths, "Files to touch", "path", Core::ArgsParser::Required::Yes);
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args_parser.parse(arguments);
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if (input_datetime.is_empty() + input_time.is_empty() + reference_path.is_empty() < 2)
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err("cannot specify a time with more than one option");
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if (!input_datetime.is_empty())
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parse_datetime(input_datetime, atime, mtime);
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else if (!input_time.is_empty())
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parse_time(input_time, atime, mtime);
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else if (!reference_path.is_empty())
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reference_time(reference_path, atime, mtime);
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else
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atime.tv_nsec = mtime.tv_nsec = UTIME_NOW;
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// According to POSIX, if neither -a nor -m are specified, then the program
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// should behave as if both are specified.
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if (!update_atime && !update_mtime)
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update_atime = update_mtime = true;
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if (update_atime && !update_mtime)
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mtime.tv_nsec = UTIME_OMIT;
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if (update_mtime && !update_atime)
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atime.tv_nsec = UTIME_OMIT;
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auto has_errors = false;
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for (auto path : paths) {
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if (FileSystem::exists(path)) {
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if (utimensat(AT_FDCWD, path.characters(), times, 0) == -1) {
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warnln("failed to touch '{}': {}", path, strerror(errno));
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has_errors = true;
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}
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} else if (!no_create_file) {
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auto error_or_fd = Core::System::open(path, O_CREAT, 0100644);
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if (error_or_fd.is_error()) {
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warnln("failed to open '{}': {}", path, strerror(error_or_fd.error().code()));
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has_errors = true;
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continue;
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}
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if (futimens(error_or_fd.value(), times) == -1) {
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warnln("failed to touch '{}': {}", path, strerror(errno));
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has_errors = true;
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continue;
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}
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(void)Core::System::close(error_or_fd.value());
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}
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}
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return has_errors ? 1 : 0;
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}
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