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serenity/Libraries/LibC/time.cpp

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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <Kernel/KernelInfoPage.h>
#include <Kernel/Syscall.h>
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#include <sys/times.h>
#include <time.h>
extern "C" {
time_t time(time_t* tloc)
{
struct timeval tv;
struct timezone tz;
if (gettimeofday(&tv, &tz) < 0)
return (time_t)-1;
if (tloc)
*tloc = tv.tv_sec;
return tv.tv_sec;
}
int gettimeofday(struct timeval* __restrict__ tv, void* __restrict__)
{
static volatile KernelInfoPage* kernel_info;
if (!kernel_info)
kernel_info = (volatile KernelInfoPage*)syscall(SC_get_kernel_info_page);
for (;;) {
auto serial = kernel_info->serial;
*tv = const_cast<struct timeval&>(kernel_info->now);
if (serial == kernel_info->serial)
break;
}
return 0;
}
char* ctime(const time_t* t)
{
return asctime(localtime(t));
}
static inline bool __is_leap_year(int year)
{
return ((year % 4 == 0) && ((year % 100 != 0) || (year % 400) == 0));
}
static const int __days_per_month[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
static const int __seconds_per_day = 60 * 60 * 24;
static void time_to_tm(struct tm* tm, time_t t)
{
int days = t / __seconds_per_day;
int remaining = t % __seconds_per_day;
tm->tm_sec = remaining % 60;
remaining /= 60;
tm->tm_min = remaining % 60;
tm->tm_hour = remaining / 60;
tm->tm_wday = (4 + days) % 7;
int year;
for (year = 1970; days >= 365 + __is_leap_year(year); ++year)
days -= 365 + __is_leap_year(year);
tm->tm_year = year - 1900;
tm->tm_yday = days;
tm->tm_mday = 1;
if (__is_leap_year(year) && days == 59)
++tm->tm_mday;
if (__is_leap_year(year) && days >= 59)
--days;
int month;
for (month = 0; month < 11 && days >= __days_per_month[month]; ++month)
days -= __days_per_month[month];
tm->tm_mon = month;
tm->tm_mday += days;
}
time_t mktime(struct tm* tm)
{
int days = 0;
int seconds = tm->tm_hour * 3600 + tm->tm_min * 60 + tm->tm_sec;
for (int year = 70; year < tm->tm_year; ++year)
days += 365 + __is_leap_year(1900 + year);
tm->tm_yday = tm->tm_mday - 1;
for (int month = 0; month < tm->tm_mon; ++month)
tm->tm_yday += __days_per_month[month];
if (tm->tm_mon > 1 && __is_leap_year(1900 + tm->tm_year))
++tm->tm_yday;
days += tm->tm_yday;
return days * __seconds_per_day + seconds + timezone;
}
struct tm* localtime(const time_t* t)
{
static struct tm tm_buf;
return localtime_r(t, &tm_buf);
}
struct tm* localtime_r(const time_t* t, struct tm* tm)
{
if (!t)
return nullptr;
time_to_tm(tm, (*t) - timezone);
return tm;
}
struct tm* gmtime(const time_t* t)
{
static struct tm tm_buf;
return gmtime_r(t, &tm_buf);
}
struct tm* gmtime_r(const time_t* t, struct tm* tm)
{
if (!t)
return nullptr;
time_to_tm(tm, *t);
return tm;
}
char* asctime(const struct tm* tm)
{
static char buffer[69];
strftime(buffer, sizeof buffer, "%a %b %e %T %Y", tm);
return buffer;
}
//FIXME: Some formats are not supported.
size_t strftime(char* destination, size_t max_size, const char* format, const struct tm* tm)
{
const char wday_short_names[7][4] = {
"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
};
const char wday_long_names[7][10] = {
"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
};
const char mon_short_names[12][4] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
const char mon_long_names[12][10] = {
"January", "February", "March", "April", "May", "June",
"July", "Auguest", "September", "October", "November", "December"
};
StringBuilder builder { max_size - 1 };
const int format_len = strlen(format);
for (int i = 0; i < format_len; ++i) {
if (format[i] != '%') {
builder.append(format[i]);
} else {
if (++i >= format_len)
return 0;
switch (format[i]) {
case 'a':
builder.append(wday_short_names[tm->tm_wday]);
break;
case 'A':
builder.append(wday_long_names[tm->tm_wday]);
break;
case 'b':
builder.append(mon_short_names[tm->tm_mon]);
break;
case 'B':
builder.append(mon_long_names[tm->tm_mon]);
break;
case 'C':
builder.appendf("%02d", (tm->tm_year + 1900) / 100);
break;
case 'd':
builder.appendf("%02d", tm->tm_mday);
break;
case 'D':
builder.appendf("%02d/%02d/%02d", tm->tm_mon + 1, tm->tm_mday, (tm->tm_year + 1900) % 100);
break;
case 'e':
builder.appendf("%2d", tm->tm_mday);
break;
case 'h':
builder.append(mon_short_names[tm->tm_mon]);
break;
case 'H':
builder.appendf("%02d", tm->tm_hour);
break;
case 'I':
builder.appendf("%02d", tm->tm_hour % 12);
break;
case 'j':
builder.appendf("%03d", tm->tm_yday + 1);
break;
case 'm':
builder.appendf("%02d", tm->tm_mon + 1);
break;
case 'M':
builder.appendf("%02d", tm->tm_min);
break;
case 'n':
builder.append('\n');
break;
case 'p':
builder.append(tm->tm_hour < 12 ? "a.m." : "p.m.");
break;
case 'r':
builder.appendf("%02d:%02d:%02d %s", tm->tm_hour % 12, tm->tm_min, tm->tm_sec, tm->tm_hour < 12 ? "a.m." : "p.m.");
break;
case 'R':
builder.appendf("%02d:%02d", tm->tm_hour, tm->tm_min);
break;
case 'S':
builder.appendf("%02d", tm->tm_sec);
break;
case 't':
builder.append('\t');
break;
case 'T':
builder.appendf("%02d:%02d:%02d", tm->tm_hour, tm->tm_min, tm->tm_sec);
break;
case 'u':
builder.appendf("%d", tm->tm_wday ? tm->tm_wday : 7);
break;
case 'U': {
const int wday_of_year_beginning = (tm->tm_wday + 6 * tm->tm_yday) % 7;
const int week_number = (tm->tm_yday + wday_of_year_beginning) / 7;
builder.appendf("%02d", week_number);
break;
}
case 'V': {
const int wday_of_year_beginning = (tm->tm_wday + 6 + 6 * tm->tm_yday) % 7;
int week_number = (tm->tm_yday + wday_of_year_beginning) / 7 + 1;
if (wday_of_year_beginning > 3) {
if (tm->tm_yday >= 7 - wday_of_year_beginning)
--week_number;
else {
const int days_of_last_year = 365 + __is_leap_year(tm->tm_year + 1900 - 1);
const int wday_of_last_year_beginning = (wday_of_year_beginning + 6 * days_of_last_year) % 7;
week_number = (days_of_last_year + wday_of_last_year_beginning) / 7 + 1;
if (wday_of_last_year_beginning > 3)
--week_number;
}
}
builder.appendf("%02d", week_number);
break;
}
case 'w':
builder.appendf("%d", tm->tm_wday);
break;
case 'W': {
const int wday_of_year_beginning = (tm->tm_wday + 6 + 6 * tm->tm_yday) % 7;
const int week_number = (tm->tm_yday + wday_of_year_beginning) / 7;
builder.appendf("%02d", week_number);
break;
}
case 'y':
builder.appendf("%02d", (tm->tm_year + 1900) % 100);
break;
case 'Y':
builder.appendf("%d", tm->tm_year + 1900);
break;
case '%':
builder.append('%');
break;
default:
return 0;
}
}
if (builder.length() > max_size - 1)
return 0;
}
strcpy(destination, builder.build().characters());
return builder.length();
}
long timezone = 0;
long altzone;
char* tzname[2];
int daylight;
void tzset()
{
//FIXME: Here we prepend we are in UTC+0.
timezone = 0;
}
clock_t clock()
{
struct tms tms;
times(&tms);
return tms.tms_utime + tms.tms_stime;
}
int clock_gettime(clockid_t clock_id, struct timespec* ts)
{
int rc = syscall(SC_clock_gettime, clock_id, ts);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int clock_nanosleep(clockid_t clock_id, int flags, const struct timespec* requested_sleep, struct timespec* remaining_sleep)
{
Syscall::SC_clock_nanosleep_params params { clock_id, flags, requested_sleep, remaining_sleep };
int rc = syscall(SC_clock_nanosleep, &params);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int clock_getres(clockid_t, struct timespec*)
{
ASSERT_NOT_REACHED();
}
}
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