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/*-
* Copyright (c) 2008 Christos Zoulas
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 "file.h"
#ifndef lint
FILE_RCSID("@(#)$File: cdf_time.c,v 1.24 2023/07/17 15:54:44 christos Exp $")
#endif
#include <time.h>
#ifdef TEST
#include <err.h>
#endif
#include <string.h>
#include "cdf.h"
#define isleap(y) ((((y) % 4) == 0) && \
((((y) % 100) != 0) || (((y) % 400) == 0)))
static const int mdays[] = {
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};
/*
* Return the number of days between jan 01 1601 and jan 01 of year.
*/
static int
cdf_getdays(int year)
{
int days = 0;
int y;
for (y = CDF_BASE_YEAR; y < year; y++)
days += isleap(y) + 365;
return days;
}
/*
* Return the day within the month
*/
static int
cdf_getday(int year, int days)
{
size_t m;
for (m = 0; m < __arraycount(mdays); m++) {
int sub = mdays[m] + (m == 1 && isleap(year));
if (days < sub)
return days;
days -= sub;
}
return days;
}
/*
* Return the 0...11 month number.
*/
static int
cdf_getmonth(int year, int days)
{
size_t m;
for (m = 0; m < __arraycount(mdays); m++) {
days -= mdays[m];
if (m == 1 && isleap(year))
days--;
if (days <= 0)
return CAST(int, m);
}
return CAST(int, m);
}
int
cdf_timestamp_to_timespec(struct timespec *ts, cdf_timestamp_t t)
{
struct tm tm;
#ifdef HAVE_STRUCT_TM_TM_ZONE
static char UTC[] = "UTC";
#endif
int rdays;
/* Unit is 100's of nanoseconds */
ts->tv_nsec = (t % CDF_TIME_PREC) * 100;
t /= CDF_TIME_PREC;
tm.tm_sec = CAST(int, t % 60);
t /= 60;
tm.tm_min = CAST(int, t % 60);
t /= 60;
tm.tm_hour = CAST(int, t % 24);
t /= 24;
/* XXX: Approx */
tm.tm_year = CAST(int, CDF_BASE_YEAR + (t / 365));
rdays = cdf_getdays(tm.tm_year);
t -= rdays - 1;
tm.tm_mday = cdf_getday(tm.tm_year, CAST(int, t));
tm.tm_mon = cdf_getmonth(tm.tm_year, CAST(int, t));
tm.tm_wday = 0;
tm.tm_yday = 0;
tm.tm_isdst = 0;
#ifdef HAVE_STRUCT_TM_TM_GMTOFF
tm.tm_gmtoff = 0;
#endif
#ifdef HAVE_STRUCT_TM_TM_ZONE
tm.tm_zone = UTC;
#endif
tm.tm_year -= 1900;
ts->tv_sec = mktime(&tm);
if (ts->tv_sec == -1) {
errno = EINVAL;
return -1;
}
return 0;
}
int
/*ARGSUSED*/
cdf_timespec_to_timestamp(cdf_timestamp_t *t, const struct timespec *ts)
{
#ifndef __lint__
(void)&t;
(void)&ts;
#endif
#ifdef notyet
struct tm tm;
if (gmtime_r(&ts->ts_sec, &tm) == NULL) {
errno = EINVAL;
return -1;
}
*t = (ts->ts_nsec / 100) * CDF_TIME_PREC;
*t += tm.tm_sec;
*t += tm.tm_min * 60;
*t += tm.tm_hour * 60 * 60;
*t += tm.tm_mday * 60 * 60 * 24;
#endif
return 0;
}
char *
cdf_ctime(const time_t *sec, char *buf)
{
char *ptr = *sec > MAX_CTIME ? NULL : ctime_r(sec, buf);
if (ptr != NULL)
return buf;
#ifdef WIN32
(void)snprintf(buf, 26, "*Bad* 0x%16.16I64x\n",
CAST(long long, *sec));
#else
(void)snprintf(buf, 26, "*Bad* %#16.16" INT64_T_FORMAT "x\n",
CAST(long long, *sec));
#endif
return buf;
}
#ifdef TEST_TIME
int
main(int argc, char *argv[])
{
struct timespec ts;
char buf[25];
static const cdf_timestamp_t tst = 0x01A5E403C2D59C00ULL;
static const char *ref = "Sat Apr 23 01:30:00 1977";
char *p, *q;
cdf_timestamp_to_timespec(&ts, tst);
p = cdf_ctime(&ts.tv_sec, buf);
if ((q = strchr(p, '\n')) != NULL)
*q = '\0';
if (strcmp(ref, p) != 0)
errx(1, "Error date %s != %s\n", ref, p);
return 0;
}
#endif
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