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/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* This localtime is a modified version of offtime from libc, which does not
* bother to figure out the time zone from the kernel, from environment
* variables, or from Unix files.
*/
#include <sys/types.h>
#include <sys/salib.h>
#include <tzfile.h>
#include <errno.h>
static int mon_lengths[2][MONS_PER_YEAR] = {
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31,
31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};
static int year_lengths[2] = {
DAYS_PER_NYEAR, DAYS_PER_LYEAR
};
struct tm *
localtime(const time_t *clock)
{
struct tm *tmp;
long days;
long rem;
int y;
int yleap;
int *ip;
static struct tm tm;
tmp = &tm;
days = *clock / SECS_PER_DAY;
rem = *clock % SECS_PER_DAY;
while (rem < 0) {
rem += SECS_PER_DAY;
--days;
}
while (rem >= SECS_PER_DAY) {
rem -= SECS_PER_DAY;
++days;
}
tmp->tm_hour = (int)(rem / SECS_PER_HOUR);
rem = rem % SECS_PER_HOUR;
tmp->tm_min = (int)(rem / SECS_PER_MIN);
tmp->tm_sec = (int)(rem % SECS_PER_MIN);
tmp->tm_wday = (int)((EPOCH_WDAY + days) % DAYS_PER_WEEK);
if (tmp->tm_wday < 0)
tmp->tm_wday += DAYS_PER_WEEK;
y = EPOCH_YEAR;
if (days >= 0) {
for (;;) {
yleap = isleap(y);
if (days < (long)year_lengths[yleap])
break;
if (++y > 9999) {
errno = EOVERFLOW;
return (NULL);
}
days = days - (long)year_lengths[yleap];
}
} else {
do {
if (--y < 0) {
errno = EOVERFLOW;
return (NULL);
}
yleap = isleap(y);
days = days + (long)year_lengths[yleap];
} while (days < 0);
}
tmp->tm_year = y - TM_YEAR_BASE;
tmp->tm_yday = (int)days;
ip = mon_lengths[yleap];
for (tmp->tm_mon = 0; days >= (long)ip[tmp->tm_mon]; ++(tmp->tm_mon))
days = days - (long)ip[tmp->tm_mon];
tmp->tm_mday = (int)(days + 1);
tmp->tm_isdst = 0;
return (tmp);
}
/*
* So is ctime...
*/
/*
* This routine converts time as follows.
* The epoch is 0000 Jan 1 1970 GMT.
* The argument time is in seconds since then.
* The localtime(t) entry returns a pointer to an array
* containing
* seconds (0-59)
* minutes (0-59)
* hours (0-23)
* day of month (1-31)
* month (0-11)
* year-1970
* weekday (0-6, Sun is 0)
* day of the year
* daylight savings flag
*
* The routine corrects for daylight saving
* time and will work in any time zone provided
* "timezone" is adjusted to the difference between
* Greenwich and local standard time (measured in seconds).
* In places like Michigan "daylight" must
* be initialized to 0 to prevent the conversion
* to daylight time.
* There is a table which accounts for the peculiarities
* undergone by daylight time in 1974-1975.
*
* The routine does not work
* in Saudi Arabia which runs on Solar time.
*
* asctime(tvec)
* where tvec is produced by localtime
* returns a ptr to a character string
* that has the ascii time in the form
* Thu Jan 01 00:00:00 1970\n\0
* 01234567890123456789012345
* 0 1 2
*
* ctime(t) just calls localtime, then asctime.
*
* tzset() looks for an environment variable named
* TZ.
* If the variable is present, it will set the external
* variables "timezone", "altzone", "daylight", and "tzname"
* appropriately. It is called by localtime, and
* may also be called explicitly by the user.
*/
#define dysize(A) (((A)%4)? 365: 366)
#define CBUFSIZ 26
/*
* POSIX.1c standard version of the function asctime_r.
* User gets it via static asctime_r from the header file.
*/
char *
__posix_asctime_r(const struct tm *t, char *cbuf)
{
const char *Date = "Day Mon 00 00:00:00 1900\n";
const char *Day = "SunMonTueWedThuFriSat";
const char *Month = "JanFebMarAprMayJunJulAugSepOctNovDec";
static char *ct_numb();
const char *ncp;
const int *tp;
char *cp;
if (t == NULL)
return (NULL);
cp = cbuf;
for (ncp = Date; *cp++ = *ncp++; /* */)
;
ncp = Day + (3*t->tm_wday);
cp = cbuf;
*cp++ = *ncp++;
*cp++ = *ncp++;
*cp++ = *ncp++;
cp++;
tp = &t->tm_mon;
ncp = Month + ((*tp) * 3);
*cp++ = *ncp++;
*cp++ = *ncp++;
*cp++ = *ncp++;
cp = ct_numb(cp, *--tp);
cp = ct_numb(cp, *--tp+100);
cp = ct_numb(cp, *--tp+100);
cp = ct_numb(cp, *--tp+100);
if (t->tm_year > 9999) {
errno = EOVERFLOW;
return (NULL);
} else {
uint_t hun = 19 + (t->tm_year / 100);
cp[1] = (hun / 10) + '0';
cp[2] = (hun % 10) + '0';
}
cp += 2;
cp = ct_numb(cp, t->tm_year+100);
return (cbuf);
}
/*
* POSIX.1c Draft-6 version of the function asctime_r.
* It was implemented by Solaris 2.3.
*/
char *
asctime_r(const struct tm *t, char *cbuf, int buflen)
{
if (buflen < CBUFSIZ) {
errno = ERANGE;
return (NULL);
}
return (__posix_asctime_r(t, cbuf));
}
char *
ctime(const time_t *t)
{
return (asctime(localtime(t)));
}
char *
asctime(const struct tm *t)
{
static char cbuf[CBUFSIZ];
return (asctime_r(t, cbuf, CBUFSIZ));
}
static char *
ct_numb(char *cp, int n)
{
cp++;
if (n >= 10)
*cp++ = (n/10)%10 + '0';
else
*cp++ = ' '; /* Pad with blanks */
*cp++ = n%10 + '0';
return (cp);
}
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