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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1988 AT&T */
/* All Rights Reserved */
/*
* 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.
*/
#include "lint.h"
#include <mtlib.h>
#include <sys/types.h>
#include <time.h>
#include <errno.h>
#include <thread.h>
#include <synch.h>
#include "libc.h"
#include "tsd.h"
#define dysize(A) (((A)%4)? 365: 366)
#define CBUFSIZ 26
static char *
ct_numb(char *cp, int n, char pad)
{
cp++;
if (n >= 10)
*cp++ = (n / 10) % 10 + '0';
else
*cp++ = pad;
*cp++ = n % 10 + '0';
return (cp);
}
/*
* 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)
{
char *cp;
const char *ncp;
const char *Date = "Day Mon 00 00:00:00 YYYY\n";
const char *Day = "SunMonTueWedThuFriSat";
const char *Month = "JanFebMarAprMayJunJulAugSepOctNovDec";
int year = t->tm_year + 1900;
cp = cbuf;
for (ncp = Date; (*cp++ = *ncp++) != '\0'; /* */)
;
ncp = Day + (3 * t->tm_wday);
cp = cbuf;
*cp++ = *ncp++;
*cp++ = *ncp++;
*cp++ = *ncp++;
cp++;
ncp = Month + (3 * t->tm_mon);
*cp++ = *ncp++;
*cp++ = *ncp++;
*cp++ = *ncp++;
cp = ct_numb(cp, t->tm_mday, ' ');
cp = ct_numb(cp, t->tm_hour, '0');
cp = ct_numb(cp, t->tm_min, '0');
cp = ct_numb(cp, t->tm_sec, '0');
if (year < 0 || year >= 10000) {
/* Only positive, 4-digit years are supported */
errno = EOVERFLOW;
return (NULL);
}
cp = ct_numb(cp, year / 100, '0');
cp--;
(void) ct_numb(cp, year, '0');
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)
{
char *cbuf = tsdalloc(_T_CTIME, CBUFSIZ, NULL);
struct tm *p;
if (cbuf == NULL)
return (NULL);
p = localtime(t);
if (p == NULL)
return (NULL);
return (__posix_asctime_r(p, cbuf));
}
char *
asctime(const struct tm *t)
{
char *cbuf = tsdalloc(_T_CTIME, CBUFSIZ, NULL);
if (cbuf == NULL)
return (NULL);
return (__posix_asctime_r(t, cbuf));
}
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