f9a10360bc
If time_t is 64-bit (i.e. isn't 32-bit) allow any value of year, not just years less than 2038. Don't bother fixing the underflow in the case of years before 1903. MFC after: 1 week Sponsored by: DARPA, AFRL
227 lines
6.2 KiB
C
227 lines
6.2 KiB
C
/*-
|
|
* Copyright (c) 1988 University of Utah.
|
|
* Copyright (c) 1982, 1990, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* the Systems Programming Group of the University of Utah Computer
|
|
* Science Department.
|
|
*
|
|
* 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.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
|
|
*
|
|
* from: Utah $Hdr: clock.c 1.18 91/01/21$
|
|
* from: @(#)clock.c 8.2 (Berkeley) 1/12/94
|
|
* from: NetBSD: clock_subr.c,v 1.6 2001/07/07 17:04:02 thorpej Exp
|
|
* and
|
|
* from: src/sys/i386/isa/clock.c,v 1.176 2001/09/04
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/clock.h>
|
|
#include <sys/limits.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/timetc.h>
|
|
|
|
int tz_minuteswest;
|
|
int tz_dsttime;
|
|
|
|
/*
|
|
* The adjkerntz and wall_cmos_clock sysctls are in the "machdep" sysctl
|
|
* namespace because they were misplaced there originally.
|
|
*/
|
|
static int adjkerntz;
|
|
static int
|
|
sysctl_machdep_adjkerntz(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
int error;
|
|
error = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req);
|
|
if (!error && req->newptr)
|
|
resettodr();
|
|
return (error);
|
|
}
|
|
SYSCTL_PROC(_machdep, OID_AUTO, adjkerntz, CTLTYPE_INT|CTLFLAG_RW,
|
|
&adjkerntz, 0, sysctl_machdep_adjkerntz, "I",
|
|
"Local offset from UTC in seconds");
|
|
|
|
static int ct_debug;
|
|
SYSCTL_INT(_debug, OID_AUTO, clocktime, CTLFLAG_RW,
|
|
&ct_debug, 0, "Enable printing of clocktime debugging");
|
|
|
|
static int wall_cmos_clock;
|
|
SYSCTL_INT(_machdep, OID_AUTO, wall_cmos_clock, CTLFLAG_RW,
|
|
&wall_cmos_clock, 0, "Enables application of machdep.adjkerntz");
|
|
|
|
/*--------------------------------------------------------------------*
|
|
* Generic routines to convert between a POSIX date
|
|
* (seconds since 1/1/1970) and yr/mo/day/hr/min/sec
|
|
* Derived from NetBSD arch/hp300/hp300/clock.c
|
|
*/
|
|
|
|
|
|
#define FEBRUARY 2
|
|
#define days_in_year(y) (leapyear(y) ? 366 : 365)
|
|
#define days_in_month(y, m) \
|
|
(month_days[(m) - 1] + (m == FEBRUARY ? leapyear(y) : 0))
|
|
/* Day of week. Days are counted from 1/1/1970, which was a Thursday */
|
|
#define day_of_week(days) (((days) + 4) % 7)
|
|
|
|
static const int month_days[12] = {
|
|
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
|
|
};
|
|
|
|
|
|
/*
|
|
* This inline avoids some unnecessary modulo operations
|
|
* as compared with the usual macro:
|
|
* ( ((year % 4) == 0 &&
|
|
* (year % 100) != 0) ||
|
|
* ((year % 400) == 0) )
|
|
* It is otherwise equivalent.
|
|
*/
|
|
static int
|
|
leapyear(int year)
|
|
{
|
|
int rv = 0;
|
|
|
|
if ((year & 3) == 0) {
|
|
rv = 1;
|
|
if ((year % 100) == 0) {
|
|
rv = 0;
|
|
if ((year % 400) == 0)
|
|
rv = 1;
|
|
}
|
|
}
|
|
return (rv);
|
|
}
|
|
|
|
static void
|
|
print_ct(struct clocktime *ct)
|
|
{
|
|
printf("[%04d-%02d-%02d %02d:%02d:%02d]",
|
|
ct->year, ct->mon, ct->day,
|
|
ct->hour, ct->min, ct->sec);
|
|
}
|
|
|
|
int
|
|
clock_ct_to_ts(struct clocktime *ct, struct timespec *ts)
|
|
{
|
|
time_t secs;
|
|
int i, year, days;
|
|
|
|
year = ct->year;
|
|
|
|
if (ct_debug) {
|
|
printf("ct_to_ts(");
|
|
print_ct(ct);
|
|
printf(")");
|
|
}
|
|
|
|
/* Sanity checks. */
|
|
if (ct->mon < 1 || ct->mon > 12 || ct->day < 1 ||
|
|
ct->day > days_in_month(year, ct->mon) ||
|
|
ct->hour > 23 || ct->min > 59 || ct->sec > 59 ||
|
|
(sizeof(time_t) == 4 && year > 2037)) { /* time_t overflow */
|
|
if (ct_debug)
|
|
printf(" = EINVAL\n");
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Compute days since start of time
|
|
* First from years, then from months.
|
|
*/
|
|
days = 0;
|
|
for (i = POSIX_BASE_YEAR; i < year; i++)
|
|
days += days_in_year(i);
|
|
|
|
/* Months */
|
|
for (i = 1; i < ct->mon; i++)
|
|
days += days_in_month(year, i);
|
|
days += (ct->day - 1);
|
|
|
|
/* Add hours, minutes, seconds. */
|
|
secs = ((days * 24 + ct->hour) * 60 + ct->min) * 60 + ct->sec;
|
|
|
|
ts->tv_sec = secs;
|
|
ts->tv_nsec = ct->nsec;
|
|
if (ct_debug)
|
|
printf(" = %ld.%09ld\n", (long)ts->tv_sec, (long)ts->tv_nsec);
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
clock_ts_to_ct(struct timespec *ts, struct clocktime *ct)
|
|
{
|
|
int i, year, days;
|
|
time_t rsec; /* remainder seconds */
|
|
time_t secs;
|
|
|
|
secs = ts->tv_sec;
|
|
days = secs / SECDAY;
|
|
rsec = secs % SECDAY;
|
|
|
|
ct->dow = day_of_week(days);
|
|
|
|
/* Subtract out whole years, counting them in i. */
|
|
for (year = POSIX_BASE_YEAR; days >= days_in_year(year); year++)
|
|
days -= days_in_year(year);
|
|
ct->year = year;
|
|
|
|
/* Subtract out whole months, counting them in i. */
|
|
for (i = 1; days >= days_in_month(year, i); i++)
|
|
days -= days_in_month(year, i);
|
|
ct->mon = i;
|
|
|
|
/* Days are what is left over (+1) from all that. */
|
|
ct->day = days + 1;
|
|
|
|
/* Hours, minutes, seconds are easy */
|
|
ct->hour = rsec / 3600;
|
|
rsec = rsec % 3600;
|
|
ct->min = rsec / 60;
|
|
rsec = rsec % 60;
|
|
ct->sec = rsec;
|
|
ct->nsec = ts->tv_nsec;
|
|
if (ct_debug) {
|
|
printf("ts_to_ct(%ld.%09ld) = ",
|
|
(long)ts->tv_sec, (long)ts->tv_nsec);
|
|
print_ct(ct);
|
|
printf("\n");
|
|
}
|
|
}
|
|
|
|
int
|
|
utc_offset(void)
|
|
{
|
|
|
|
return (tz_minuteswest * 60 + (wall_cmos_clock ? adjkerntz : 0));
|
|
}
|