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/* Copyright (c) 2004, 2019, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
Without limiting anything contained in the foregoing, this file,
which is part of C Driver for MySQL (Connector/C), is also subject to the
Universal FOSS Exception, version 1.0, a copy of which can be found at
http://oss.oracle.com/licenses/universal-foss-exception.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/**
@file mysys/my_systime.cc Functions for manipulating timespec
structs and get_date for converting a time_t to string using various
date formats.
*/
#include "my_systime.h"
#include "my_config.h"
#include <assert.h>
#include <algorithm> // std::min
#include <chrono>
#include <cstdio> // std::sprintf()
#include <limits> // std::numeric_limits
// Note that timespec is in time.h in C99, but std::timespec will not
// be in ctime until C++17
#include <time.h> // time_t, timespec
/**
Set the value of a timespec object to the current time plus a
number of nanosconds.
@note the sec value is capped at std::chrono::nanoseconds::max()
@param[out] abstime time value being modified
@param nsec number of nanoseconds to add to current time
*/
void set_timespec_nsec(struct timespec *abstime, Timeout_type nsec) {
assert(nsec != std::numeric_limits<Timeout_type>::max());
if (nsec == TIMEOUT_INF) {
*abstime = TIMESPEC_POSINF;
return;
}
unsigned long long int now = my_getsystime() + (nsec / 100);
unsigned long long int tv_sec = now / 10000000ULL;
#if SIZEOF_TIME_T < SIZEOF_LONG_LONG
/* Ensure that the number of seconds don't overflow. */
tv_sec = std::min(tv_sec, static_cast<unsigned long long int>(
std::numeric_limits<time_t>::max()));
#endif
abstime->tv_sec = static_cast<time_t>(tv_sec);
abstime->tv_nsec = (now % 10000000ULL) * 100 + (nsec % 100);
}
/**
Set the value of a timespec object to the current time plus a
number of seconds using seconds.
@note the sec value is capped at std::chrono::seconds::max()
@param[out] abstime time value being modified
@param sec number of seconds to add to current time
*/
void set_timespec(struct timespec *abstime, Timeout_type sec) {
assert(sec != std::numeric_limits<Timeout_type>::max());
if (sec == TIMEOUT_INF) {
*abstime = TIMESPEC_POSINF;
return;
}
set_timespec_nsec(abstime, sec * 1000000000ULL);
}
/**
Store textual representation of date in a character array.
@param[out] to character array where date will be written
@param flag format of date:
If flag & GETDATE_TIME Return date and time
If flag & GETDATE_SHORT_DATE Return short date format YYMMDD
If flag & GETDATE_HHMMSSTIME Return time in HHMMDD format.
If flag & GETDATE_GMT Date/time in GMT
If flag & GETDATE_FIXEDLENGTH Return fixed length date/time
@param date time_t value for conversion.
@note If flag & GETDATE_T_DELIMITER Append 'T' between date and time.
If flag & GETDATE_SHORT_DATE_FULL_YEAR Return compact date format YYYYMMDD
*/
void get_date(char *to, int flag, time_t date) {
struct tm *start_time;
time_t skr;
struct tm tm_tmp;
skr = date ? (time_t)date : my_time(0);
if (flag & GETDATE_GMT)
gmtime_r(&skr, &tm_tmp);
else
localtime_r(&skr, &tm_tmp);
start_time = &tm_tmp;
if (flag & GETDATE_SHORT_DATE) {
to += std::sprintf(to, "%02d%02d%02d", start_time->tm_year % 100,
start_time->tm_mon + 1, start_time->tm_mday);
} else if (flag & GETDATE_SHORT_DATE_FULL_YEAR) {
to += std::sprintf(to, "%4d%02d%02d", start_time->tm_year + 1900,
start_time->tm_mon + 1, start_time->tm_mday);
} else {
to += std::sprintf(
to, ((flag & GETDATE_FIXEDLENGTH) ? "%4d-%02d-%02d" : "%d-%02d-%02d"),
start_time->tm_year + 1900, start_time->tm_mon + 1,
start_time->tm_mday);
}
if (flag & GETDATE_DATE_TIME) {
if (flag & GETDATE_T_DELIMITER) {
*to = 'T';
++to;
}
to += std::sprintf(
to,
((flag & GETDATE_FIXEDLENGTH) ? " %02d:%02d:%02d" : " %2d:%02d:%02d"),
start_time->tm_hour, start_time->tm_min, start_time->tm_sec);
} else if (flag & GETDATE_HHMMSSTIME) {
if (flag & GETDATE_T_DELIMITER) {
*to = 'T';
++to;
}
to += std::sprintf(to, "%02d%02d%02d", start_time->tm_hour,
start_time->tm_min, start_time->tm_sec);
}
}
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